0001047127-25-000030 | 10-K | XBRL Viewer

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Investments (Schedule of Contractual Maturities of Cash Equivalents and Available-for-Sale Debt Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Within 1 year, amortized cost	$ 493,164
After 1 year through 5 years, amortized cost	158,482
Total, amortized cost	726,061	$ 581,367
Within 1 year, fair value	493,511
After 1 year through 5 years, fair value	158,514
Total, fair value	725,554	$ 581,573
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Asset-backed securities, amortized cost	74,415
Asset-backed securities, fair value	$ 73,529

Derivatives (Tables)

12 Months Ended

Dec. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Fair Value of Derivative Instruments in Statement of Financial Position

As of December 31, 2024 and 2023, our foreign exchange forward contracts consisted of the following:


	December 31, 2024					December 31, 2023
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Japanese yen	$	254,783	$	10	Other current assets	$	279,027	$	2,745	Other current assets
Korean won	80,260		(472)		Accrued expenses	59,036		(97)		Accrued expenses
Philippine peso	8,431		(29)		Accrued expenses	6,553		(20)		Accrued expenses
Singapore dollar	8,454		(39)		Accrued expenses	11,506		20		Other current assets
Taiwan dollar	31,150		(70)		Accrued expenses	37,914		89		Other current assets
Total forward contracts not designated as hedging instruments	$	383,078	$	(600)		$	394,036	$	2,737


	December 31, 2024					December 31, 2023
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	123,042	$	(83)	Accrued expenses	$	—	$	—	N/A
Total forward contracts designated as net investment hedging instruments	$	123,042	$	(83)		$	—	$	—

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2024

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:


	Unrealized Gain (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Balance at December 31, 2022	$	(1,573)	$	14,220	$	4,052	$	16,699
Other comprehensive income (loss) before reclassifications	2,265		1,731		(3,819)		177
Amounts reclassified from accumulated other comprehensive income (loss)	(480)		(46)		—		(526)
Other comprehensive income (loss)	1,785		1,685		(3,819)		(349)
Balance at December 31, 2023	$	212	$	15,905	$	233	$	16,350
Other comprehensive income (loss) before reclassifications	(469)		1,053		(8,783)		(8,199)
Amounts reclassified from accumulated other comprehensive income (loss)	(253)		(388)		—		(641)
Other comprehensive income (loss)	(722)		665		(8,783)		(8,840)
Balance at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510

(1)Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3).

(2)Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

(3)Beginning in 2024, foreign currency translation includes the gain (loss) from net investment hedges (Note 15).

Other Income and Expense

12 Months Ended

Dec. 31, 2024

Other Income and Expenses [Abstract]

Other Income and Expense

Other income and expense consists of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Interest income	$	(65,541)	$	(48,458)	$	(12,762)
Foreign currency (gain) loss, net	8,856		18,361		(1,572)
Loss on debt retirement	—		—		464
Other	(821)		(2,457)		(4,439)
Total other (income) expense, net	$	(57,506)	$	(32,554)	$	(18,309)

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 6,317,692	$ 6,503,065	$ 7,091,585
Cost of sales	5,384,480	5,559,912	5,761,598
Gross profit	933,212	943,153	1,329,987
Selling, general and administrative	331,806	295,393	283,372
Research and development	162,951	177,473	149,429
Total operating expenses	494,757	472,866	432,801
Operating income	438,455	470,287	897,186
Interest expense	64,945	59,000	58,563
Other (income) expense, net	(57,506)	(32,554)	(18,309)
Total other expense, net	7,439	26,446	40,254
Income before taxes	431,016	443,841	856,932
Income tax expense	75,481	81,710	89,890
Net income	355,535	362,131	767,042
Net income attributable to noncontrolling interests	(1,523)	(2,318)	(1,219)
Net income attributable to Amkor	$ 354,012	$ 359,813	$ 765,823
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 1.44	$ 1.46	$ 3.13
Diluted (in dollars per share)	$ 1.43	$ 1.46	$ 3.11
Shares used in computing per common share amounts:
Basic (in shares)	246,344	245,628	244,676
Diluted (in shares)	247,818	247,176	246,205

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Total Amkor Stockholders’ Equity	Common Stock	Additional Paid- In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest in Subsidiaries
Balance at beginning of period, common stock (in shares) at Dec. 31, 2021			290,466
Balance at beginning of period at Dec. 31, 2021	$ 2,972,546	$ 2,942,276	$ 290	$ 1,977,134	$ 1,163,939	$ 19,978	$ (219,065)	$ 30,270
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2021							(46,151)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	767,042	765,823			765,823			1,219
Other comprehensive income (loss)	(3,279)	(3,279)				(3,279)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(7)
Treasury stock acquired through surrender of shares for tax withholding	(161)	(161)					$ (161)
Issuance of stock through share-based compensation plans (in shares)			783
Issuance of stock through share-based compensation plans	5,649	5,649	$ 1	5,648
Share-based compensation	13,562	13,562		13,562
Cash dividends declared	(55,118)	(55,118)			(55,118)
Subsidiary dividends to noncontrolling interests	(540)							(540)
Balance at end of period, common stock (in shares) at Dec. 31, 2022			291,249
Balance at end of period at Dec. 31, 2022	3,699,701	3,668,752	$ 291	1,996,344	1,874,644	16,699	$ (219,226)	30,949
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022							(46,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	362,131	359,813			359,813			2,318
Other comprehensive income (loss)	(349)	(349)				(349)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(121)
Treasury stock acquired through surrender of shares for tax withholding	(3,109)	(3,109)					$ (3,109)
Issuance of stock through share-based compensation plans (in shares)			918
Issuance of stock through share-based compensation plans	3,550	3,550	$ 1	3,549
Share-based compensation	8,277	8,277		8,277
Cash dividends declared	(74,626)	(74,626)			(74,626)
Subsidiary dividends to noncontrolling interests	$ (540)							(540)
Balance at end of period, common stock (in shares) at Dec. 31, 2023	245,888		292,167
Balance at end of period at Dec. 31, 2023	$ 3,995,035	3,962,308	$ 292	2,008,170	2,159,831	16,350	$ (222,335)	32,727
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023	(46,279)						(46,279)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 355,535	354,012			354,012			1,523
Other comprehensive income (loss)	(8,840)	(8,840)				(8,840)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(89)
Treasury stock acquired through surrender of shares for tax withholding	(2,698)	(2,698)					$ (2,698)
Issuance of stock through share-based compensation plans (in shares)			885
Issuance of stock through share-based compensation plans	5,103	5,103	$ 1	5,102
Share-based compensation	18,371	18,371		18,371
Cash dividends declared	(178,711)	(178,711)			(178,711)
Subsidiary dividends to noncontrolling interests	$ (630)							(630)
Balance at end of period, common stock (in shares) at Dec. 31, 2024	246,684		293,052
Balance at end of period at Dec. 31, 2024	$ 4,183,165	$ 4,149,545	$ 293	$ 2,031,643	$ 2,335,132	$ 7,510	$ (225,033)	$ 33,620
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024	(46,368)						(46,368)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Leases (Schedule of Components of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 40,110	$ 70,722	$ 81,410
Amortization of leased assets	35,290	42,345	24,644
Interest on lease liabilities	9,138	5,521	3,891
Total finance lease cost	44,428	47,866	28,535
Short-term lease cost	4,599	4,788	5,749
Variable lease cost	7,409	6,921	6,592
Net lease cost	96,546	130,297	122,286
Operating cash flows for operating leases	39,111	73,774	81,044
Operating cash flows for finance leases	8,736	5,419	3,933
Financing cash flows for finance leases	$ 72,255	$ 66,398	$ 40,673
Weighted average remaining lease term, Operating leases	6 years	6 years 1 month 6 days	4 years 2 months 12 days
Weighted average remaining lease term, Finance leases	3 years 10 months 24 days	3 years 2 months 12 days	2 years 3 months 18 days
Weighted average discount rate, Operating leases	5.80%	5.20%	4.40%
Weighted average discount rate, Finance leases	6.30%	5.70%	4.10%

Accrued Expenses

12 Months Ended

Dec. 31, 2024

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following:


	December 31,
	2024		2023
	(In thousands)
Payroll and benefits	$	121,683	$	115,604
Deferred revenue and customer advances	59,656		71,117
Short-term finance lease liability	55,613		57,761
Income taxes payable	35,067		35,215
Accrued pension and severance obligations (Note 12)	13,091		7,906
Accrued interest	11,487		11,175
Other accrued expenses	59,740		59,636
Total accrued expenses	$	356,337	$	358,414

Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 7,898	$ 19,831	$ 40,063
State	34	7	150
Foreign	68,333	48,478	61,300
Current income tax expense (benefit)	76,265	68,316	101,513
Deferred:
Federal	153	8,899	(10,156)
State	(501)	1	1,458
Foreign	(436)	4,494	(2,925)
Deferred income tax expense (benefit)	(784)	13,394	(11,623)
Income tax expense	$ 75,481	$ 81,710	$ 89,890

Derivatives (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Derivatives (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	$ (14.0)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gain (loss) on derivatives		$ (38.6)	$ (60.2)
Designated as Hedging Instrument \| Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Gain (loss) on derivatives	4.4
Other comprehensive income (loss), changes in fair value of the net investment hedges	$ 1.0

- Definition

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References + Details

Pension and Severance Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Accumulated benefit obligation	$ 123.4	$ 128.3
Expected contributions in next fiscal year	10.0
Cost recognized	$ 26.5	$ 27.0	$ 24.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 354,012	$ 359,813	$ 765,823

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 34: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 37: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Debt (Schedule of Interest Rates) (Details)		12 Months Ended
Debt (Schedule of Interest Rates) (Details)	Dec. 31, 2023	Dec. 31, 2024
Japan \| Short-term Term Loans, Variable Rate \| Subsidiary Term Loans
Debt Instrument [Line Items]
Interest rate at end of period (as a percent)	0.24%	0.00%
China \| Term Loan, SOFR Plus 0.75% Due June 2025 \| Subsidiary Term Loans
Debt Instrument [Line Items]
Interest rate spread (as a percent)		0.75%
Interest rate at end of period (as a percent)	6.07%	5.15%
China \| Term Loan, SOFR Plus 0.75% Due 2025 \| Subsidiary Term Loans
Debt Instrument [Line Items]
Interest rate spread (as a percent)		0.75%
Interest rate at end of period (as a percent)	6.07%	5.15%
China \| Term Loans, SOFR Plus 0.95%, Due December 2026 \| Subsidiary Term Loans
Debt Instrument [Line Items]
Interest rate spread (as a percent)	1.40%	0.95%
Interest rate at end of period (as a percent)	6.76%	5.28%

Business Segments, Customer Concentrations and Geographic Information (Schedule of Revenue from External Customers by Products and Services) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 6,317,692	$ 6,503,065	$ 7,091,585
Net Sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	100.00%	100.00%	100.00%
Advanced Products
Segment Reporting Information [Line Items]
Net sales	$ 5,174,459	$ 5,032,859	$ 5,367,589
Mainstream Products
Segment Reporting Information [Line Items]
Net sales	$ 1,143,233	$ 1,470,206	$ 1,723,996
Communications (smartphones, tablets) \| Net Sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	48.00%	50.00%	44.00%
Computing (data center, infrastructure, PC/laptop, storage) \| Net Sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	19.00%	16.00%	16.00%
Automotive, industrial and other (ADAS, electrification, infotainment, safety) \| Net Sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	18.00%	21.00%	20.00%
Consumer (AR & gaming, connected home, home electronics, wearables) \| Net Sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	15.00%	13.00%	20.00%

Leases (Narrative) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
Leases not yet commenced	$ 22

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Instruments that are not Recorded at Fair Value on Recurring Basis

The following table presents the fair value of our debt:


	December 31, 2024				December 31, 2023
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	525,562	$	522,615	$	531,778	$	521,839
Revolving credit facilities and term loans (Level 2)	625,818		636,845		666,316		681,617
Total debt	$	1,151,380	$	1,159,460	$	1,198,094	$	1,203,456

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 158.6	$ 253.9
Factoring Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 0.4	$ 1.3

Income Taxes (Schedule of Net Operating Loss Carryforwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
U.S. federal net operating loss carryforwards
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	$ 0	$ 5,611
U.S. state net operating loss carryforwards
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	27,334	32,612
Foreign net operating loss carryforwards
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	$ 207,203	$ 196,636

Other Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Other Income and Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Income and Expenses [Abstract]
Interest income	$ (65,541)	$ (48,458)	$ (12,762)
Foreign currency (gain) loss, net	8,856	18,361	(1,572)
Loss on debt retirement	0	0	464
Other	(821)	(2,457)	(4,439)
Total other (income) expense, net	$ (57,506)	$ (32,554)	$ (18,309)

Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 21,420	$ 33,679
Tax credit carryforwards	69,373	88,147
Property, plant and equipment	18,512	21,387
Deferred interest expense	446	476
Accrued liabilities	37,968	37,832
Receivable	27,284	30,086
Unrealized foreign exchange loss	23,769	7,205
Operating lease liabilities	14,825	16,053
Other	14,203	15,219
Total deferred tax assets	227,800	250,084
Valuation allowance	(107,113)	(114,811)
Total deferred tax assets net of valuation allowance	120,687	135,273
Deferred tax liabilities:
Property, plant and equipment	27,442	34,206
Deferred gain	3,341	5,739
Unrealized foreign exchange gain	6,674	3,129
Unbilled receivables	6,508	8,995
Operating lease right of use assets	14,240	16,031
Other	6,560	5,533
Total deferred tax liabilities	64,765	73,633
Other assets	72,488	73,585
Other non-current liabilities	(16,566)	(11,945)
Net deferred tax assets	$ 55,922	$ 61,640

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Summary of Significant Accounting Policies

Description of Business

Amkor is the world’s largest U.S. headquartered OSAT (outsourced semiconductor assembly and test) service provider. Since its founding in 1968, Amkor has pioneered the outsourcing of IC packaging and test services and is a strategic manufacturing partner for the world’s leading semiconductor companies, foundries, and electronics OEMs. Amkor provides turnkey manufacturing services for the communication, computing, automotive and industrial and consumer markets, including smartphones, data centers, artificial intelligence, electric vehicles and wearables. Amkor’s operational base includes production facilities, research and development centers and sales and support offices located in key electronics manufacturing regions in Asia, Europe and the United States. Amkor has built a leading position by:

•Designing and developing innovative packaging and test technologies focused on advanced packaging solutions in high growth markets, including artificial intelligence;

•Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution;

•Cultivating long-standing relationships with our customers and industry partners;

•Focusing on strategic end markets that offer solid growth potential;

•Providing a geographically diverse operating base with manufacturing facilities in multiple countries across Asia and in Europe; and

•Developing a competitive cost structure through disciplined capital investment.

Basis of Presentation

Our Consolidated Financial Statements include the accounts of Amkor Technology, Inc. and its subsidiaries. Our Consolidated Financial Statements reflect the elimination of all significant inter-company accounts and transactions. Our investments in variable interest entities in which we are the primary beneficiary are consolidated. We reflect the remaining portion of variable interest entities and foreign subsidiaries that are not wholly owned as noncontrolling interests.

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, income taxes, inventory and long-lived assets. These estimates are based on management’s best knowledge of current events, historical experience, actions that we may undertake in the future and on various other assumptions that are believed to be reasonable under the circumstances. As a result, actual results could differ materially from these estimates and assumptions, including the impact of any deterioration in the global business and economic environment.

Consolidation of Variable Interest Entities

We have variable interests in certain Philippine realty corporations in which we have a 40% ownership. We lease land and buildings in the Philippines from these entities and we are the primary beneficiary of these arrangements. As of December 31, 2024 and 2023, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet were $17.3 million and $0.1 million, respectively, for each period. The impact of consolidating these variable interest entities on our Consolidated Statements of Income was not significant, and other than our lease payments, we have not provided any significant assistance or other financial support to these variable interest entities for the years ended December 31, 2024, 2023 or 2022. The creditors of the Philippine realty corporations have no recourse to our general credit.

Foreign Currency Translation

The U.S. dollar is the functional currency of our subsidiaries other than our Japan operations. The foreign currency asset and liability amounts at these subsidiaries are remeasured into U.S. dollars at end-of-period exchange rates, except for nonmonetary items which are remeasured at historical rates. Foreign currency income and expenses are remeasured at daily exchange rates, except for expenses related to balance sheet amounts which are remeasured at historical exchange rates. Exchange gains and losses arising from remeasurement of foreign currency-denominated monetary assets and liabilities are included in other (income) expense, net in the period in which they occur.

The Japanese yen is the functional currency of our Japan operations. The asset and liability amounts of our Japan operations are translated into U.S. dollars at end-of-period exchange rates. Income and expenses are translated into U.S. dollars at the daily exchange rate. The resulting translation adjustments are reported as a component of accumulated other comprehensive income (loss) in the stockholders’ equity section of the balance sheet. Assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency prior to translation into U.S. dollars, and the resulting transaction exchange gains or losses are included in other (income) expense, net in the period in which they occur.

Risks and Concentrations

The semiconductor industry is characterized by rapid technological change, competitive pricing pressures and cyclical market patterns. Our financial results are affected by a wide variety of factors, including general economic conditions worldwide, economic conditions specific to the semiconductor industry, the timely implementation of new package and test technologies, the ability to safeguard patents and intellectual property in a rapidly evolving market and reliance on materials and equipment suppliers. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns at various times. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

A significant portion of our revenues is concentrated with a small group of customers (Note 18). Direct sales to our two largest customers accounted for 30.8% and 10.2% of our net sales for the year ended December 31, 2024. The loss of a significant customer, a business combination among customers, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

Financial instruments, for which we are subject to credit risk, consist principally of accounts receivable and cash, cash equivalents and short-term investments. With respect to accounts receivable, we mitigate our credit risk by selling primarily to well-established companies, performing ongoing credit evaluations and making frequent contact with customers. In addition, we may utilize non-recourse factoring when considered appropriate. We have historically mitigated our credit risk with respect to cash and cash equivalents through diversification of our holdings into various high quality money market funds and bank deposit accounts. Our short-term investments are principally investments in debt securities with maximum duration of twenty-four months and range from AAA to BB rated financial instruments. Our short-term investments are primarily in corporate bonds, direct obligations of the U.S. Government or its agencies, asset-backed securities and commercial paper. At December 31, 2024, our cash and cash equivalents were primarily maintained in various U.S. and foreign bank operating and time deposit accounts and invested in various available-for-sale debt investments. See Note 6 for further discussion regarding our available-for-sale debt investments.

Contingencies and Litigation

We may be subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 17. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we

accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if we believe they are material and there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Cash and Cash Equivalents

We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents are primarily maintained in various U.S. and foreign bank operating and time deposit accounts and invested in various available-for-sale debt investments. See Note 6 for further discussion regarding our available-for-sale debt investments.

Restricted Cash

Restricted cash, non-current, mainly consists of collateral to fulfill utility requirements.

Investments

Generally, we classify our short-term investments in fixed income securities as available-for-sale debt investments. All of our available-for-sale debt investments as of December 31, 2024 are available to fund current operations and are recorded at fair value (Note 6). Unrealized gains and losses on our available-for-sale debt investments are included as a separate component of accumulated other comprehensive income (loss), net of tax. Realized gains and losses on our available-for-sale debt investments and declines in value judged to be an impairment are included in other (income) expense, net. The cost of short-term investments matured or sold is based on the average cost method.

We evaluate on an ongoing basis the market conditions, trends of earnings, financial condition, credit ratings, any underlying collateral and other key measures for our short-term investments in determining if and when a decline in value below the adjusted cost of our available-for-sale debt investments is an impairment. An impairment is considered if (i) we have the intent to sell the security, (ii) it is more likely than not that we will be required to sell the security before recovery of the entire amortized cost basis or (iii) we do not expect to recover the entire amortized cost basis of the security. If impairment is considered on condition (i) or (ii) above, the entire difference between the amortized cost and the fair value of the debt security is recognized in earnings. If impairment is considered based on condition (iii), the amount representing credit losses will be recognized in earnings and as an allowance for credit losses. The amount relating to all other factors will be recognized in other comprehensive income.

Inventories

Inventories consist of raw materials and purchased components and are stated at the lower of cost and net realizable value. Cost is principally determined by standard cost or the weighted moving average method, both of which approximate actual cost. We review and set our standard costs as needed, but at a minimum on a quarterly basis. We reduce the carrying value of our inventories for the cost of inventory we estimate is excess and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Other Current Assets

Other current assets consist principally of prepaid assets.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:


Buildings and improvements			10 to 40 years
Machinery and equipment			2 to 7 years
Software and computer equipment			3 to 5 years
Furniture, fixtures and other equipment			4 to 10 years

We periodically assess the estimated useful lives of our property, plant and equipment. Based on our assessment of test equipment and its increased interchangeability enabling broader and longer use, we extended the estimated useful lives of test equipment from five years to seven years as of January 1, 2024. See Note 8 for further discussion of the estimated useful lives assessment.

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts, and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

Grant Accounting

From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Government grants are recognized in earnings on a systematic basis over the periods in which the entity incurs costs for which the grants are intended to compensate.

In 2024, we acquired approximately 56 acres of land related to the Arizona Facility with a total fair value of $36.9 million. In connection with this acquisition, we paid $4.2 million with the remaining amount obtained as a tangible non-monetary grant subject to the construction and operation of the Arizona Facility. We initially recorded the grant as a deferred liability in other non-current liabilities, and subsequently it will be reclassified on a net basis against construction and operation costs.

In August 2022, the U.S. government enacted the CHIPS Act, which provides funding for manufacturing grants and research investments and establishes a 25% investment tax credit for certain investments in U.S. semiconductor manufacturing. In 2024, we recorded $1.4 million of investment tax credits, which reduced the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets. These investment tax credits are recorded either as a reduction of current income taxes payable or as other assets. In December 2024, Commerce awarded us up to $407 million in direct funding pursuant to the CHIPS Act for the Arizona Facility. This award requires us to achieve construction and production milestones and restrict us from undertaking certain activities. As of December 31, 2024, no funding amounts have been received.

Leases

We lease certain machinery and equipment, office space, and manufacturing facilities. Leases with an initial term of 12 months or less are not recorded on the balance sheet, and we recognize lease expense for these leases on a straight-line basis over the lease term. We combine lease components (e.g., fixed payments including rent, real estate taxes and

insurance costs) with the non-lease components (e.g., common-area maintenance costs) for all asset classes. We use our incremental borrowing rate based on the information available at the lease commencement date to determine the lease liability. Our leases have remaining lease terms ranging from less than one year to 81 years. For purposes of calculating our lease liabilities, our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise those options. Certain leases also include options or obligations to purchase the leased property. Total long-term finance lease liabilities as of December 31, 2024 and December 31, 2023 were $122.7 million and $47.8 million, respectively, and are included in other non-current liabilities.

Goodwill

Goodwill is recorded when the cost of an acquisition exceeds the fair value of the net tangible and identifiable intangible assets acquired. We review goodwill for impairment annually during the fourth quarter of each year and whenever events or changes in circumstances indicate that an impairment may exist. Impairment losses are recorded when the carrying amount of the reporting unit exceeds its fair value. The balance of goodwill in our Consolidated Balance Sheets reflects adjustments for foreign currency translation.

Other Assets

Other assets consist principally of deferred tax assets, refundable security deposits and advanced payments to vendors.

Derivatives

We have foreign exchange risk related to monetary asset and liability positions at certain subsidiaries. To mitigate the impacts of these exposures, we enter into foreign exchange forward contracts, generally settled monthly. We do not apply hedge accounting to these derivatives. The derivatives are recorded at the fair value either in other current assets or accrued expenses, with the associated gains and losses charged to other (income) expense, net in the period in which they occur. Gains and losses recognized on these derivatives are classified as operating activities and are included within other, net in our Consolidated Statements of Cash Flows.

We hedge certain net investment positions in foreign subsidiaries. To accomplish this, we enter into foreign currency forward contracts, generally settled monthly, that are designated as hedges of net investments. The difference between the forward rate and the spot rate of the net investment hedge forward contracts is excluded from the assessment of hedge effectiveness and subsequently reported in other (income) expense, net on a straight-line basis over the life of the forward contracts. These gains and losses are classified as operating activities and are included within other, net in our Consolidated Statements of Cash Flows. Changes in the fair value of the forward contracts are recognized in other comprehensive income (loss) within foreign currency translation.

See Note 15 for further discussion about the derivatives.

Fair Value Measurements

We apply fair value accounting for assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring or nonrecurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. See Note 16 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue, net of sales, use, value-added and other similar taxes, as a performance obligation is satisfied in an amount reflecting the consideration to which we expect to be entitled. We apply a five-step approach in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the performance obligation is satisfied. Substantially all of our revenue is recognized as services are rendered.

Our packaging and test services are our performance obligations to our customers. Our packaging services include wafer bump, probe and assembly. We provide packaging and test services to our customers either individually or as part of a combined offering. In a combined offering, we account for the individual services separately if they are determined to be distinct. We determine a service to be distinct if it is separately identifiable from other services in the combined offering and if a customer can benefit from the unique service on its own or with other resources that are readily available to the customer.

The consideration, including variable consideration, is allocated between the distinct services in a combined offering based upon the stand-alone selling prices of the individual services. Our services involve a high degree of specialization which are unique based on the design and purpose of the customer’s wafers. Accordingly, our negotiated pricing reflects the customized nature of our services and represents a customer-specific stand-alone selling price. We recognize revenue as services are rendered, which generally occurs over the course of two to three weeks. Services are generally billed at completion of each individual packaging or test service or in some instances at the completion of all services in a combined offering.

We recognize revenue over time as services are rendered because our services create or enhance the customer’s wafer. We utilize an input method (cost incurred plus estimated margin) to determine the amount of revenue to recognize for in-process, but incomplete, customer orders at a reporting date. During the period of providing our services, we generally do not control or take ownership of customers’ wafers, nor do we include the cost of the wafer in our cost calculations. We believe that a cost-based input method is the most appropriate manner to measure how we satisfy our performance obligations to customers because the effort and costs incurred to package and/or test customer wafers are not linear over the duration of these services.

Shipping and handling costs are accounted for as a cost to fulfill our performance obligations to customers. Accordingly, we record customer payments of shipping and handling costs as a component of net sales, and the costs incurred for shipping and handling are then charged to cost of sales.

Unbilled receivables are revenues that have been recognized for performance obligations that have been satisfied, or partially satisfied, in advance of billing the customer. Revenue may be recognized in advance of billing as our contracts provide us with an unconditional right to consideration for work that is performed. Total unbilled receivables as of December 31, 2024 and 2023 were $210.1 million and $260.8 million, respectively. These amounts are included in accounts receivable, net of allowances in our Consolidated Balance Sheets.

At times, we receive cash payments from customers in advance of our performance. In such cases, we record deferred revenue until the performance obligation is satisfied, which represents a contract liability and is included in accrued expenses and other non-current liabilities in the consolidated balance sheets. These contract liabilities are classified as either current or long-term based on the timing of when we expect to recognize revenue. Contract liabilities were $95.6 million and $135.5 million as of December 31, 2024 and December 31, 2023, respectively. As of December 31, 2024 and December 31, 2023, the short-term portion of the liability was $59.7 million and $71.1 million, respectively. The remainder of the December 31, 2024 contract liability balance is expected to be recognized in revenue over the next 1-5 years. Revenue recognized during the year that was included in the contract liability balance at the beginning of the period was $66.0 million, $66.9 million, and $101.2 million, for 2024, 2023 and 2022, respectively.

Research and Development Costs

Research and development expenses include costs attributable to the conduct of research and development programs primarily related to the development of new package designs or technologies and improving the efficiency and capabilities of our existing production processes. Such costs include labor, materials, supplies, depreciation and maintenance of research equipment, services provided by outside contractors and the allocable portions of facility costs such as rent, utilities, insurance, repairs and maintenance, depreciation and general support services. Costs associated with research and development are expensed as incurred.

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis as well as for net operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related tax benefits will not be realized.

We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets in the jurisdictions from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and recent results of operations. With the exception of a certain foreign jurisdiction and select U.S. and foreign carryforwards, we consider it more likely than not that we will have sufficient taxable income to allow us to realize these deferred tax assets. However, in the event taxable income falls short of current expectations, we may need to establish a valuation allowance against such deferred tax assets.

We recognize in our Consolidated Financial Statements the impact of an income tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Related interest and penalties are classified as income taxes in the financial statements. See Note 4 for further discussion regarding unrecognized income tax benefits.

Recently Issued Standards

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 requires disclosure of additional income tax information, primarily related to effective tax rate reconciliation and income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. Adoption of this ASU should be applied on a prospective basis, but retrospective application is permitted. The new standard will result in enhanced disclosures in our financial statements.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which was subsequently amended and clarified. ASU 2024-03 requires disaggregation of key expense categories such as inventory purchases, employee compensation, depreciation and intangible asset amortization in the financial statements. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. Adoption of this ASU should be applied either prospectively after the effective date or retrospectively to any or all periods presented in the financial statements. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.

Income Taxes (Schedule of Tax Credit Carryforwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
U.S. Federal \| U.S. Foreign Tax Credits
Tax Credit Carryforward [Line Items]
Foreign Tax Credits	$ 49,639	$ 51,512
U.S. Federal \| U.S. Other Tax Credits
Tax Credit Carryforward [Line Items]
Foreign Tax Credits	3,817	2,559
Foreign
Tax Credit Carryforward [Line Items]
Foreign Tax Credits	$ 19,543	$ 34,546

Debt

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Debt

Short-term borrowings and long-term debt consist of the following:


	December 31,
	2024		2023
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.625% Senior notes, due September 2027	$	525,000	$	525,000

Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (1)	—		—
Term loan, fixed rate at 2.12%, due December 2028	200,000		200,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (2)	—		5,098
Term loan, fixed rate at 1.35%, due December 2024	—		40,414
Term loan, fixed rate at 1.20%, due December 2025	13,868		30,913
Term loan, fixed rate at 1.23%, due December 2026	33,333		55,729
Term loan, fixed rate at 1.59%, due December 2027	59,923		89,053
Term loan, fixed rate at 1.80%, due December 2028	89,059		124,078
Term loan, fixed rate at 2.05%, due December 2029 (3)	108,779		—
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, due June 2025	35,000		37,000
Term loans, SOFR plus 0.75%, due 2025	55,500		57,500
Term loans, SOFR plus 0.95%, due December 2026 (4)	44,000		45,000
Other:
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)	—		—
	1,164,462		1,209,785
Less: Unamortized discount and deferred debt costs, net	(5,002)		(6,329)
Less: Short-term borrowings and current portion of long-term debt	(236,029)		(131,624)
Long-term debt	$	923,431	$	1,071,832

(1)In April 2021, we entered into a ₩80 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024 at a fixed rate of 1.85%. In May 2024, we replaced this loan by entering into a ₩80.0 billion (approximately $59 million) term loan agreement with the option to borrow and re-borrow the funds up to six times per year through May 2027. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 3.95%. During the year ended December 31, 2024, we borrowed $58.7 million, which we immediately repaid. As of December 31, 2024, ₩80.0 billion, or approximately $54 million, was available to be drawn.

(2)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of December 31, 2024, $6.0 million was available to be drawn.

(3)In December 2024, we borrowed ¥17.1 billion (US$113.9 million) under a new term loan agreement due December 2029, guaranteed by Amkor Technology, Inc. and our subsidiary, ATSH. Principal is due in 20 equal, quarterly installments plus accrued interest, through maturity.

(4)In February 2024, Amkor Assembly & Test (Shanghai) Co. Ltd. amended the term loan due December 2026 to reduce the interest rate from SOFR plus 1.40% to SOFR plus 0.95%. This contractual amendment is treated as a modification with no recognized gain or loss.

(5)In March 2022, ATSH entered into the 2022 Singapore Revolver, which is guaranteed by Amkor Technology, Inc., ATT and AATT. The maximum borrowing capacity under the 2022 Singapore Revolver is limited to a base amount equal to the lesser of: (1) $600.0 million; or (2) $250.0 million plus a variable amount equal to 37.5% of our consolidated accounts receivable balance. As of December 31, 2024, $600.0 million was available for future borrowings under the 2022 Singapore Revolver.

Certain of our foreign debt is collateralized by the land, buildings, equipment and accounts receivable in the respective locations. As of December 31, 2024 the collateralized debt balance was $639.5 million, of which $286.1 million of assets were pledged as collateral.

Interest Rates

Interest is payable semiannually on our senior notes and quarterly or monthly on our other fixed- and variable-rate debt. Refer to the table above for the interest rates on our fixed-rate debt and to the table below for the interest rates on our variable-rate debt.


	December 31,
	2024		2023
Amkor Technology Japan, Inc:
Short-term term loans, variable rate	—	%	0.24	%
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75% due June 2025	5.15	%	6.07	%
Term loans, SOFR plus 0.75%, due 2025	5.15	%	6.07	%
Term loans, SOFR plus 0.95%, due December 2026	5.28	%	6.76	%

Compliance with Debt Covenants

The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. From time to time, Amkor Technology, Inc., ATT, AATT and ATSH guarantee certain debt of our subsidiaries. The agreements governing our indebtedness contain affirmative and negative covenants which restrict our ability to pay dividends and could restrict our operations. These restrictions are determined in part by calculations based upon cumulative net income and do not currently have a material impact on our ability to make dividend payments or stock repurchases.

We were in compliance with all debt covenants at December 31, 2024 and 2023.

Maturities


	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2025	$	236,029
2026	173,662
2027	638,995
2028	94,020
2029	21,756
Thereafter	—
Total debt	$	1,164,462

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org/470/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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-Paragraph 1B
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Short-term investments, amortized cost	$ 513,494	$ 474,663
Allowance	$ 1,318	$ 8,114
Stockholders’ equity:
Preferred stock designated Series A, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock designated Series A, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock designated Series A, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	293,052,000	292,167,000
Common stock, shares outstanding (in shares)	246,684,000	245,888,000
Treasury stock, shares (in shares)	46,368,000	46,279,000

Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
2025	$ 236,029
2026	173,662
2027	638,995
2028	94,020
2029	21,756
Thereafter	0
Total debt	$ 1,164,462	$ 1,209,785

Derivatives

12 Months Ended

Dec. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

We use foreign currency forward contracts to mitigate foreign currency risk of certain assets and monetary liabilities denominated in foreign currencies. We do not enter into such contracts for trading or speculative purposes. These derivative instruments are not designated as hedging instruments.

As of December 31, 2024 and 2023, our foreign exchange forward contracts consisted of the following:


	December 31, 2024					December 31, 2023
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Japanese yen	$	254,783	$	10	Other current assets	$	279,027	$	2,745	Other current assets
Korean won	80,260		(472)		Accrued expenses	59,036		(97)		Accrued expenses
Philippine peso	8,431		(29)		Accrued expenses	6,553		(20)		Accrued expenses
Singapore dollar	8,454		(39)		Accrued expenses	11,506		20		Other current assets
Taiwan dollar	31,150		(70)		Accrued expenses	37,914		89		Other current assets
Total forward contracts not designated as hedging instruments	$	383,078	$	(600)		$	394,036	$	2,737


	December 31, 2024					December 31, 2023
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	123,042	$	(83)	Accrued expenses	$	—	$	—	N/A
Total forward contracts designated as net investment hedging instruments	$	123,042	$	(83)		$	—	$	—

For the year ended December 31, 2024, we incurred a net loss of $14.0 million due to the impact of derivatives not designated as hedging instruments, which includes the forward costs, and the related hedged items. For the years ended December 31, 2023 and 2022, the derivatives not designated as hedging instruments resulted in a net loss of $38.6 million and $60.2 million, respectively, which were partially offset by the foreign currency gains associated with the underlying net liabilities.

For the year ended December 31, 2024, a gain of $4.4 million was recognized in other (income) expense, net for the difference between the forward rate and the spot rate of the net investment hedge. For the year ended December 31, 2024, a gain of $1.0 million was recognized in other comprehensive income (loss) for the changes in fair value of the net investment hedge. There was no activity related to net investment hedges for the years ended December 31, 2023 and 2022.

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 1,133,553	$ 1,119,818
Short-term investments (amortized cost of $513,494 and $474,663, respectively)	512,984	474,869
Accounts receivable, net of allowances of $1,318 and $8,114, respectively	1,055,013	1,149,493
Inventories	310,910	393,128
Other current assets	61,012	58,502
Total current assets	3,073,472	3,195,810
Property, plant and equipment, net	3,576,148	3,299,445
Operating lease right of use assets	109,730	117,006
Goodwill	17,947	20,003
Restricted cash	759	799
Other assets	166,272	138,062
Total assets	6,944,328	6,771,125
Current liabilities:
Short-term borrowings and current portion of long-term debt	236,029	131,624
Trade accounts payable	712,887	754,453
Capital expenditures payable	123,195	106,368
Short-term operating lease liability	26,827	33,616
Accrued expenses	356,337	358,414
Total current liabilities	1,455,275	1,384,475
Long-term debt	923,431	1,071,832
Pension and severance obligations	70,594	87,133
Long-term operating lease liabilities	57,983	56,837
Other non-current liabilities	253,880	175,813
Total liabilities	2,761,163	2,776,090
Commitments and contingencies (Note 17)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	0	0
Common stock, $0.001 par value, 500,000 shares authorized, 293,052 and 292,167 shares issued, and 246,684 and 245,888 shares outstanding, respectively	293	292
Additional paid-in capital	2,031,643	2,008,170
Retained earnings	2,335,132	2,159,831
Accumulated other comprehensive income (loss)	7,510	16,350
Treasury stock, at cost, 46,368 and 46,279 shares, respectively	(225,033)	(222,335)
Total Amkor stockholders’ equity	4,149,545	3,962,308
Noncontrolling interests in subsidiaries	33,620	32,727
Total equity	4,183,165	3,995,035
Total liabilities and equity	$ 6,944,328	$ 6,771,125

Factoring of Accounts Receivable	12 Months Ended
Factoring of Accounts Receivable	Dec. 31, 2024
Factoring of Accounts Receivable [Abstract]
Factoring of Accounts Receivable	Factoring of Accounts ReceivableFor certain accounts receivable, we use non-recourse factoring arrangements with third-party financial institutions to manage our working capital and cash flows. Under these arrangements, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the years ended December 31, 2024 and 2023, we sold accounts receivable totaling $158.6 million and $253.9 million, net of discounts and fees of $0.4 million and $1.3 million, respectively.

Income Taxes (Schedule of Reconciliation of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
Foreign income taxed at different rates	(2.10%)	(4.20%)	(12.00%)
Foreign exchange (loss) gain	1.40%	0.50%	2.20%
Change in valuation allowance	(1.80%)	2.90%	(2.40%)
Income tax credits generated	(6.80%)	(7.50%)	(6.10%)
Foreign earnings and profits	3.50%	7.00%	9.00%
Foreign derived intangible income	(1.80%)	(1.60%)	(0.90%)
Settlements and changes in uncertain tax positions	3.80%	(0.50%)	(0.20%)
Other	0.30%	0.80%	(0.10%)
Income tax expense	17.50%	18.40%	10.50%

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of period	$ 31,537	$ 33,253	$ 37,293
Additions based on tax positions related to the current year	7,260	0	1,519
Additions for tax positions of prior years	3,761	495	1,909
Reductions for tax positions of prior years	(4,992)	(345)	(5,755)
Reductions related to settlements with tax authorities	(789)	0	(988)
Reductions from lapse of statutes of limitations	(461)	(1,866)	(725)
Balance, end of period	$ 36,316	$ 31,537	$ 33,253

Debt (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Schedule of Short-term Borrowings and Long-term Debt

Short-term borrowings and long-term debt consist of the following:


	December 31,
	2024		2023
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.625% Senior notes, due September 2027	$	525,000	$	525,000

Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (1)	—		—
Term loan, fixed rate at 2.12%, due December 2028	200,000		200,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (2)	—		5,098
Term loan, fixed rate at 1.35%, due December 2024	—		40,414
Term loan, fixed rate at 1.20%, due December 2025	13,868		30,913
Term loan, fixed rate at 1.23%, due December 2026	33,333		55,729
Term loan, fixed rate at 1.59%, due December 2027	59,923		89,053
Term loan, fixed rate at 1.80%, due December 2028	89,059		124,078
Term loan, fixed rate at 2.05%, due December 2029 (3)	108,779		—
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, due June 2025	35,000		37,000
Term loans, SOFR plus 0.75%, due 2025	55,500		57,500
Term loans, SOFR plus 0.95%, due December 2026 (4)	44,000		45,000
Other:
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)	—		—
	1,164,462		1,209,785
Less: Unamortized discount and deferred debt costs, net	(5,002)		(6,329)
Less: Short-term borrowings and current portion of long-term debt	(236,029)		(131,624)
Long-term debt	$	923,431	$	1,071,832

Schedule of Interest Rates

Refer to the table above for the interest rates on our fixed-rate debt and to the table below for the interest rates on our variable-rate debt.


	December 31,
	2024		2023
Amkor Technology Japan, Inc:
Short-term term loans, variable rate	—	%	0.24	%
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75% due June 2025	5.15	%	6.07	%
Term loans, SOFR plus 0.75%, due 2025	5.15	%	6.07	%
Term loans, SOFR plus 0.95%, due December 2026	5.28	%	6.76	%

Schedule of Maturities of Long-term Debt

Maturities


	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2025	$	236,029
2026	173,662
2027	638,995
2028	94,020
2029	21,756
Thereafter	—
Total debt	$	1,164,462

Business Segments, Customer Concentrations and Geographic Information (Schedule of Segment Revenue, Segment Profit or Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 6,317,692	$ 6,503,065	$ 7,091,585
Selling, general and administrative	331,806	295,393	283,372
Research and development	162,951	177,473	149,429
Interest expense	64,945	59,000	58,563
Income tax expense	75,481	81,710	89,890
Net income	355,535	362,131	767,042
Reportable Segment
Segment Reporting Information [Line Items]
Net sales	6,317,692	6,503,065	7,091,585
Materials cost of sales	3,478,752	3,584,090	3,646,188
Labor cost of sales	628,201	643,993	712,070
Depreciation cost of sales	534,921	576,120	565,455
Other cost of sales	742,606	755,709	837,885
Selling, general and administrative	331,806	295,393	283,372
Research and development	162,951	177,473	149,429
Interest expense	64,945	59,000	58,563
Income tax expense	75,481	81,710	89,890
Other segment items	(57,506)	(32,554)	(18,309)
Net income	$ 355,535	$ 362,131	$ 767,042

Derivatives (Schedule of Fair Value of Derivative Instruments in Statement of Financial Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Foreign Exchange Forward \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	$ 383,078	$ 394,036
Foreign Exchange Forward \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	123,042	0
Foreign Exchange Forward \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(600)	2,737
Foreign Exchange Forward \| Level 2 \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(83)	0
Foreign Exchange Forward \| Japanese yen \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	254,783	279,027
Foreign Exchange Forward \| Japanese yen \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	123,042	0
Foreign Exchange Forward \| Japanese yen \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	10	2,745
Foreign Exchange Forward \| Japanese yen \| Level 2 \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	(83)	0
Foreign Exchange Forward \| Korean won \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	80,260	59,036
Foreign Exchange Forward \| Korean won \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	(472)	(97)
Foreign Exchange Forward \| Philippine peso \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	8,431	6,553
Foreign Exchange Forward \| Philippine peso \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	(29)	(20)
Foreign Exchange Forward \| Singapore dollar \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	8,454	11,506
Foreign Exchange Forward \| Singapore dollar \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		20
Derivative liabilities, fair value	39
Foreign Exchange Forward \| Taiwan dollar \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional Value	31,150	37,914
Foreign Exchange Forward \| Taiwan dollar \| Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative assets, fair value		$ 89
Derivative liabilities, fair value	$ 70

Earnings Per Share (Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Share-based awards (in shares)	0	2	180

Pension and Severance Plans (Tables)

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Schedule of Accrued Severance Obligation

The changes to the balance of our accrued severance plan obligations are as follows:


	For the Year Ended December 31,
	2024		2023
	(In thousands)
Balance at January 1	$	47,906	$	56,289
Provision of severance benefits	3,142		1,653
Severance payments	(1,416)		(8,770)
Foreign currency (gain) loss	(6,194)		(1,266)
Balance at December 31	43,438		47,906
Payments remaining with the National Pension Fund	(101)		(119)
Total accrued severance plan obligations at December 31	43,337		47,787
Less current portion of accrued severance plan obligations (Note 10) (1)	12,231		7,906
Non-current portion of accrued severance plan obligations	$	31,106	$	39,881

(1)In December 2024, some employees accepted our offer to convert their Korean severance and defined benefit pension plan participation to a defined contribution plan. This will result in the conversion of approximately $5 million of obligations from our Korean severance plan to a defined contribution plan, which is expected to be funded during the first quarter of 2025.

Schedule of Changes in Projected Benefit Obligations and Fair Value of Plan Assets

The following table summarizes the changes to the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2024 and 2023:


	For the Year Ended December 31,
	2024		2023
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at January 1	$	164,281	$	159,760
Service cost	13,645		15,032
Interest cost	5,718		6,202
Benefits paid	(11,320)		(14,056)
Actuarial (gain) loss	2,458		4,150



Effects of curtailment	(320)		(617)
Settlement	(883)		(1,073)
Foreign exchange (gain) loss	(14,423)		(5,117)
Projected benefit obligation at December 31	159,156		164,281
Change in plan assets:
Fair value of plan assets at January 1	129,196		127,338
Actual gain (loss) on plan assets	8,918		12,325
Employer contributions	12,165		7,368

Settlement	(883)		(1,073)
Benefits paid	(11,320)		(14,056)
Foreign exchange gain (loss)	(12,794)		(2,706)
Fair value of plan assets at December 31	125,282		129,196
Funded status of the Plans at December 31	$	(33,874)	$	(35,085)

Schedule of Defined Benefit Plans - Balance Sheet


	December 31,
	2024		2023
	(In thousands)
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost (included in non-current assets)	$	5,991	$	12,039
Accrued benefit liability (included in pension and severance obligations) (1)	(39,865)		(47,124)
Net amount recognized at year end	$	(33,874)	$	(35,085)

(1)As of December 31, 2024, $0.9 million was recognized in accrued expenses.

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The following table summarizes, by component, the change in accumulated other comprehensive income (loss), net of tax related to our Plans:


	Prior Service Cost		Actuarial Net Gain (Loss)		Total
	(In thousands)
Balance at December 31, 2022	$	602	$	13,618	$	14,220
Amortization and settlement gain included in net periodic pension cost	—		(46)		(46)
Net gain (loss) arising during period	—		1,731		1,731
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income (loss)	—		1,685		1,685
Balance at December 31, 2023	$	602	$	15,303	$	15,905
Amortization and settlement gain included in net periodic pension cost	—		(388)		(388)
Net gain (loss) arising during period	—		1,053		1,053
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income (loss)	—		665		665
Balance at December 31, 2024	$	602	$	15,968	$	16,570

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

Information for pension plans with benefit obligations in excess of plan assets is as follows:


	December 31,
	2024		2023
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	92,191	$	100,662
Aggregate fair value of plan assets	52,326		53,539
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	55,646		60,638
Aggregate fair value of plan assets	20,122		21,304

Schedule of Components of Net Periodic Pension Cost

The following table summarizes total pension expense:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	13,645	$	15,032	$	20,072
Interest cost	5,718		6,202		4,731
Expected return on plan assets	(5,554)		(5,144)		(5,605)

Recognized actuarial (gain) loss	(462)		(156)		53
Net periodic pension cost	13,347		15,934		19,251
Curtailment (gain) loss	(320)		(617)		—
Settlement (gain) loss	33		132		(1,374)
Total pension expense	$	13,060	$	15,449	$	17,877

Schedule of Weighted-average Assumptions Used in Computing the Net Periodic Pension Cost and Projected Benefit Obligations

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligations:


	For the Year Ended December 31,
	2024		2023		2022
Discount rate for determining net periodic pension cost	3.8	%	4.2	%	2.6	%
Discount rate for determining benefit obligations at December 31	3.8	%	3.8	%	4.2	%
Rate of compensation increase for determining net periodic pension cost	3.7	%	3.6	%	3.7	%
Rate of compensation increase for determining benefit obligations at December 31	3.8	%	3.7	%	3.6	%
Expected rate of return on plan assets for determining net periodic pension cost	4.5	%	4.1	%	3.8	%

Schedule of Allocation of Plan Assets

The current rate of return assumption targets are based on asset allocation strategies as follows:


	Allocation
	Debt		Equity		Other
Japan defined benefit plan	64	%	34	%	2	%
Korea defined benefit plan	30	%	20	%	50	%
Philippine defined benefit plan	50	%	45	%	5	%

The fair value of our pension plan assets, by asset category utilizing the fair value hierarchy as discussed in Note 16, is as follows:


	December 31, 2024				December 31, 2023
	Level 1		Level 2		Total		Level 1		Level 2		Total
	(In thousands)				(In thousands)
Cash and cash equivalents	$	749	$	—	$	749	$	217	$	—	$	217
Equity securities	14,276		—		14,276		13,680		—		13,680
Debt securities
Government bonds	3,712		—		3,712		3,674		—		3,674
Corporate bonds	1,259		—		1,259		1,130		—		1,130
Treasury notes	11,881		—		11,881		11,993		—		11,993
Mutual and commingled funds
Equity funds	11,950		7,270		19,220		29,016		7,807		36,823
Debt funds	18,210		12,516		30,726		12,031		13,163		25,194
Guaranteed investment contracts	—		30,365		30,365		—		23,189		23,189
Taiwan retirement fund	12,428		—		12,428		12,478		—		12,478
Other, net	—		666		666		—		818		818
Total fair value of pension plan assets	$	74,465	$	50,817	$	125,282	$	84,219	$	44,977	$	129,196

Schedule of Expected Benefit Payments

The estimated future benefit payments related to our foreign defined benefit plans are as follows:


	Payments
	(In thousands)
2025	$	9,307
2026	11,145
2027	13,419
2028	14,037
2029	13,922
2030 to 2034	97,256

Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Dec. 31, 2024	Feb. 14, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Entity File Number	000-29472
Entity Registrant Name	Amkor Technology, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-1722724
Entity Address, Address Line One	2045 East Innovation Circle
Entity Address, City or Town	Tempe
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85284
City Area Code	480
Local Phone Number	821-5000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	AMKR
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 4,545
Entity Common Stock, Shares Outstanding		246,731,692
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE: Portions of the registrant’s Proxy Statement relating to its 2025 Annual Meeting of Stockholders, to be filed subsequently, are incorporated by reference into Part III of this Report where indicated.
Entity Central Index Key	0001047127
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2024

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:


	Unrealized Gain (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Balance at December 31, 2022	$	(1,573)	$	14,220	$	4,052	$	16,699
Other comprehensive income (loss) before reclassifications	2,265		1,731		(3,819)		177
Amounts reclassified from accumulated other comprehensive income (loss)	(480)		(46)		—		(526)
Other comprehensive income (loss)	1,785		1,685		(3,819)		(349)
Balance at December 31, 2023	$	212	$	15,905	$	233	$	16,350
Other comprehensive income (loss) before reclassifications	(469)		1,053		(8,783)		(8,199)
Amounts reclassified from accumulated other comprehensive income (loss)	(253)		(388)		—		(641)
Other comprehensive income (loss)	(722)		665		(8,783)		(8,840)
Balance at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510

(1)Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3).

(2)Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

(3)Beginning in 2024, foreign currency translation includes the gain (loss) from net investment hedges (Note 15).

Investments (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Debt Securities Available-for-Sale

The following table summarizes our cash equivalents and available-for-sale debt investments:


	December 31, 2024
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents


Commercial paper	$	53,110	$	—	$	—	$	53,110	$	—	$	53,110
Corporate bonds	755		—		—		755		—		755
Money market funds	146,679		—		—		146,679		146,679		—

U.S. government bonds	16,450		4		—		16,454		16,454		—

Total cash equivalents (2)	216,994		4		—		216,998		163,133		53,865

Short-term investments
Asset-backed securities	63,256		168		(1,038)		62,386		—		62,386
Certificate of deposits	15,121		—		—		15,121		15,121		—
Commercial paper	36,829		—		—		36,829		—		36,829
Corporate bonds	258,191		567		(101)		258,657		—		258,657
Foreign government bonds	1,590		—		—		1,590		—		1,590
Mortgage-backed securities	11,159		2		(18)		11,143		—		11,143
Municipal bonds	1,007		2		—		1,009		—		1,009
U.S. government agency bonds	11,392		—		(25)		11,367		—		11,367
U.S. government bonds	110,522		102		(170)		110,454		110,454		—

Total short-term investments	509,067		841		(1,352)		508,556		125,575		382,981
Total	$	726,061	$	845	$	(1,352)	$	725,554	$	288,708	$	436,846


	December 31, 2023
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents
Asset-backed securities	$	138	$	—	$	—	$	138	$	—	$	138
Commercial paper	48,063		—		—		48,063		—		48,063

Money market funds	60,719		—		—		60,719		60,719		—

US government bonds	2,996		—		—		2,996		2,996		—

Total cash equivalents (2)	111,916		—		—		111,916		63,715		48,201
Short-term investments
Asset-backed securities	65,340		170		(22)		65,488		—		65,488
Certificate of deposits	17,086		—		—		17,086		17,086		—
Commercial paper	56,273		—		—		56,273		—		56,273
Corporate bonds	251,671		432		(299)		251,804		—		251,804



U.S. government agency bonds	13,200		—		(9)		13,191		—		13,191
U.S. government bonds	65,881		13		(79)		65,815		65,815		—

Total short-term investments	469,451		615		(409)		469,657		82,901		386,756
Total	$	581,367	$	615	$	(409)	$	581,573	$	146,616	$	434,957

(1)All unrealized losses have been in a continuous loss position for less than 12 months. We do not intend to sell the investments in an unrealized loss position, and we do not believe it is more likely than not that we will be required to sell these investments before recovery of their amortized cost bases.

(2)During the years ended December 31, 2024, 2023, and 2022 we sold cash equivalent investments for proceeds of $29.8 million, $47.0 million and $29.6 million, respectively, and realized no gain or loss on such sales.

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of December 31, 2024:


	Amortized Cost		Fair Value
Within 1 year	$	493,164	$	493,511
After 1 year through 5 years	158,482		158,514

Asset- and mortgage-backed securities	74,415		73,529

Total	$	726,061	$	725,554

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Valuation allowance reversed			$ 17.8
Tax benefit from income tax holiday	$ 33.2	$ 18.6	$ 84.5
Benefit from income tax holiday on diluted earnings per share (in dollars per share)	$ 0.13	$ 0.08	$ 0.34
Repatriation of earnings estimated tax impact	$ 160.0
Unrecognized tax benefits, period increase	4.8
Unrecognized tax benefits that would impact effective tax rate	32.7
Reductions from lapse of statutes of limitations	6.6
Liability for uncertain tax positions	21.9
Unrecognized tax benefits, reduction of deferred tax assets	14.4
Accrued and unpaid interest and penalties	$ 4.5	$ 4.5

Description of Business and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) a	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2024
Schedule of Significant Accounting Policies [Line Items]
Total assets	$ 6,944,328	$ 6,771,125	$ 6,821,757
Liabilities	$ 2,761,163	$ 2,776,090
Area of land \| a	56
Payment for acquisition, land, held-for-use	$ 4,200
Investment tax credit	1,400
Government assistance, award amount	$ 407,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Long term finance lease liabilities	$ 122,700	$ 47,800
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Unbilled receivables	$ 210,100	$ 260,800
Contract with customer, liability	95,600	135,500
Contract with customer, liability, current	59,656	71,117
Contract with customer, liability, revenue recognized	66,000	$ 66,900	$ 101,200
Test Equipment
Schedule of Significant Accounting Policies [Line Items]
Useful life		5 years		7 years
Land
Schedule of Significant Accounting Policies [Line Items]
Land acquired	$ 36,900
Minimum
Schedule of Significant Accounting Policies [Line Items]
Remaining lease term	1 year
Revenue, expected timing of satisfaction, period	1 year
Maximum
Schedule of Significant Accounting Policies [Line Items]
Remaining lease term	81 years
Revenue, expected timing of satisfaction, period	5 years
First Largest Customer \| Net Sales \| Customer Concentration Risk
Schedule of Significant Accounting Policies [Line Items]
Concentration risk (as a percent)	30.80%	27.70%	20.60%
Second Largest Customer \| Net Sales \| Customer Concentration Risk
Schedule of Significant Accounting Policies [Line Items]
Concentration risk (as a percent)	10.20%		10.10%
Variable Interest Entity, Primary Beneficiary
Schedule of Significant Accounting Policies [Line Items]
Ownership percentage	40.00%
Total assets	$ 17,300
Liabilities	$ 100

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2024

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS


	Balance at Beginning of Period		Additions (Credited) Charged to Expense	Write-offs	Balance at End of Period
	(In thousands)
Deferred tax asset valuation allowance:
Year ended at December 31, 2022	$	122,357	(17,762)	(2,726)	$	101,869
Year ended at December 31, 2023	$	101,869	15,838	(2,896)	$	114,811
Year ended at December 31, 2024	$	114,811	(3,633)	(4,065)	$	107,113

Business Segments, Customer Concentrations and Geographic Information (Narrative) (Details) - segment	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Number of operating segments	1
First Largest Customer \| Net Sales \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	30.80%	27.70%	20.60%
Second Largest Customer \| Net Sales \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	10.20%		10.10%

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,995,035	$ 3,699,701	$ 2,972,546
Other comprehensive income (loss) before reclassifications	(8,199)	177
Amounts reclassified from accumulated other comprehensive income (loss)	(641)	(526)
Total other comprehensive income (loss)	(8,840)	(349)	(3,279)
Balance at end of period	4,183,165	3,995,035	3,699,701
Unrealized Gain (Losses) on Available-for-Sale Debt Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	212	(1,573)
Other comprehensive income (loss) before reclassifications	(469)	2,265
Amounts reclassified from accumulated other comprehensive income (loss)	(253)	(480)
Total other comprehensive income (loss)	(722)	1,785
Balance at end of period	(510)	212	(1,573)
Defined Benefit Pension
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	15,905	14,220
Other comprehensive income (loss) before reclassifications	1,053	1,731
Amounts reclassified from accumulated other comprehensive income (loss)	(388)	(46)
Total other comprehensive income (loss)	665	1,685
Balance at end of period	16,570	15,905	14,220
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	233	4,052
Other comprehensive income (loss) before reclassifications	(8,783)	(3,819)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	(8,783)	(3,819)
Balance at end of period	(8,550)	233	4,052
AOCI, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	16,350	16,699	19,978
Total other comprehensive income (loss)	(8,840)	(349)	(3,279)
Balance at end of period	$ 7,510	$ 16,350	$ 16,699

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

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+ Details

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

+ References

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+ Details

Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

The following table summarizes our stock option activity for the year ended December 31, 2024:


	Number of Shares (In thousands)	Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2023	2,031	$	10.58
Granted	—	—
Exercised	(396)	12.61
Forfeited or expired	(10)	13.49
Outstanding at December 31, 2024	1,625	$	10.07	3.45 years	$	25,380
Fully vested at December 31, 2024 and expected to vest thereafter	1,625	$	10.07	3.45 years	$	25,380
Exercisable at December 31, 2024	1,625	$	10.07	3.45 years	$	25,380

Schedule of Restricted Shares and RSU and PSU Activity

The following table summarizes our RSU and PSU activity:


	Number of Shares (In thousands)	Weighted- average Grant Date Fair Value (Per Share)
Non-vested at December 31, 2021	286	$	22.48
Awards granted	531	22.29
Awards vested	(22)	22.23
Awards forfeited	(57)	22.63
Non-vested at December 31, 2022	738	22.34
Awards granted	1,049	26.72
Awards vested	(464)	22.19
Awards forfeited	(16)	25.24
Non-vested at December 31, 2023	1,307	25.87
Awards granted	1,026	29.00
Awards vested	(489)	27.37
Awards forfeited	(217)	24.62
Non-vested at December 31, 2024	1,627	$	27.56

Pension and Severance Plans (Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$ 92,191	$ 100,662
Aggregate fair value of plan assets	52,326	53,539
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	55,646	60,638
Aggregate fair value of plan assets	$ 20,122	$ 21,304

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.72440	$ 0.30375	$ 0.225

Pension and Severance Plans (Schedule of Defined Benefit Plans - Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Prepaid benefit cost (included in non-current assets)	$ 5,991	$ 12,039
Accrued benefit liability (included in pension and severance obligations)	(39,865)	(47,124)
Net amount recognized at year end	(33,874)	$ (35,085)
Accrued expenses	$ 900

- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References + Details

Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business

•Designing and developing innovative packaging and test technologies focused on advanced packaging solutions in high growth markets, including artificial intelligence;

•Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution;

•Cultivating long-standing relationships with our customers and industry partners;

•Focusing on strategic end markets that offer solid growth potential;

•Providing a geographically diverse operating base with manufacturing facilities in multiple countries across Asia and in Europe; and

•Developing a competitive cost structure through disciplined capital investment.

Basis of Presentation

Use of Estimates

Consolidation of Variable Interest Entities

Foreign Currency Translation

Risks and Concentrations

Contingencies and Litigation

Cash and Cash Equivalents

Restricted Cash

Restricted cash, non-current, mainly consists of collateral to fulfill utility requirements.

Investments

Inventories

Other Current Assets

Other current assets consist principally of prepaid assets.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:


Buildings and improvements			10 to 40 years
Machinery and equipment			2 to 7 years
Software and computer equipment			3 to 5 years
Furniture, fixtures and other equipment			4 to 10 years

Other assets consist principally of deferred tax assets, refundable security deposits and advanced payments to vendors.

Derivatives

Fair Value Measurements

Revenue Recognition

Research and Development Costs

Income Taxes

Recently Issued Standards

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consist of the following:


	December 31,
	2024		2023
	(In thousands)
Land	$	246,953	$	212,722
Buildings and improvements	2,239,481		2,080,589
Machinery and equipment	7,389,787		7,022,614
Finance lease assets	274,302		209,506
Furniture, fixtures and other equipment	18,652		22,655
Software and computer equipment	215,031		200,362
Construction in progress	185,351		223,332
Total property, plant and equipment	10,569,557		9,971,780
Accumulated depreciation and amortization	(6,993,409)		(6,672,335)
Total property, plant and equipment, net	$	3,576,148	$	3,299,445

During 2024, we acquired land for the Arizona Facility with a total fair market value of $36.9 million. We anticipate beginning construction of the new facility in the second half of 2025.

The following table summarizes our depreciation expense:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Depreciation expense	$	594,141	$	630,941	$	612,105

The extension in the estimated useful lives of test equipment (Note 1) reduced depreciation expense by approximately $59 million in 2024. This benefited net income by approximately $49 million and diluted earnings per share by $0.20.

Leases

12 Months Ended

Dec. 31, 2024

Leases [Abstract]

Leases

The components of lease expense were as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Operating lease cost	$	40,110	$	70,722	$	81,410
Finance lease cost
Amortization of leased assets	35,290		42,345		24,644
Interest on lease liabilities	9,138		5,521		3,891
Total finance lease cost	44,428		47,866		28,535
Short-term lease cost	4,599		4,788		5,749
Variable lease cost	7,409		6,921		6,592
Net lease cost	$	96,546	$	130,297	$	122,286

Other information related to leases was as follows:


	For the Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	39,111		$	73,774		$	81,044
Operating cash flows for finance leases	8,736			5,419			3,933
Financing cash flows for finance leases	72,255			66,398			40,673

Weighted Average Remaining Lease Term (years)
Operating leases	6.0			6.1			4.2
Finance leases	3.9			3.2			2.3

Weighted Average Discount Rate
Operating leases	5.8		%	5.2		%	4.4		%
Finance leases	6.3		%	5.7		%	4.1		%

Maturities of lease liabilities were as follows:


	December 31, 2024
	Operating Leases		Finance Leases
	(In thousands)
2025	$	30,852	$	65,666
2026	23,072		52,194
2027	16,258		32,624
2028	6,615		17,433
2029	4,803		23,836
Thereafter	16,884		12,618
Total future minimum lease payments	98,484		204,371
Less: Imputed interest	(13,674)		(26,050)
Total	$	84,810	$	178,321

As of December 31, 2024, we have entered into additional lease agreements that have not yet commenced of approximately $22 million.

Leases

The components of lease expense were as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Operating lease cost	$	40,110	$	70,722	$	81,410
Finance lease cost
Amortization of leased assets	35,290		42,345		24,644
Interest on lease liabilities	9,138		5,521		3,891
Total finance lease cost	44,428		47,866		28,535
Short-term lease cost	4,599		4,788		5,749
Variable lease cost	7,409		6,921		6,592
Net lease cost	$	96,546	$	130,297	$	122,286

Other information related to leases was as follows:


	For the Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	39,111		$	73,774		$	81,044
Operating cash flows for finance leases	8,736			5,419			3,933
Financing cash flows for finance leases	72,255			66,398			40,673

Weighted Average Remaining Lease Term (years)
Operating leases	6.0			6.1			4.2
Finance leases	3.9			3.2			2.3

Weighted Average Discount Rate
Operating leases	5.8		%	5.2		%	4.4		%
Finance leases	6.3		%	5.7		%	4.1		%

Maturities of lease liabilities were as follows:


	December 31, 2024
	Operating Leases		Finance Leases
	(In thousands)
2025	$	30,852	$	65,666
2026	23,072		52,194
2027	16,258		32,624
2028	6,615		17,433
2029	4,803		23,836
Thereafter	16,884		12,618
Total future minimum lease payments	98,484		204,371
Less: Imputed interest	(13,674)		(26,050)
Total	$	84,810	$	178,321

As of December 31, 2024, we have entered into additional lease agreements that have not yet commenced of approximately $22 million.

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Net income	$ 354,012	$ 359,813	$ 765,823
Diluted (in dollars per share)	$ 1.43	$ 1.46	$ 3.11
Land
Property, Plant and Equipment [Line Items]
Land acquired	$ 36,900
Test Equipment, Useful Lives
Property, Plant and Equipment [Line Items]
Reduction in depreciation expense	59,000
Net income	$ 49,000
Diluted (in dollars per share)	$ 0.20

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Investments (Narrative) (Details) - Level 1 - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Fair market value of held-to-maturity securities	$ 4.4	$ 5.2
Amortized cost of held-to-maturity securities	$ 4.4	$ 5.2

Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 274,302	$ 209,506
Total property, plant and equipment	10,569,557	9,971,780
Accumulated depreciation and amortization	(6,993,409)	(6,672,335)
Total property, plant and equipment, net	3,576,148	3,299,445
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	246,953	212,722
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	2,239,481	2,080,589
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	7,389,787	7,022,614
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	18,652	22,655
Software and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	215,031	200,362
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 185,351	$ 223,332

Pension and Severance Plans

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Pension and Severance Plans

Korean Severance Plan

Our subsidiary in Korea maintains an unfunded severance plan that covers certain employees that were employed prior to August 1, 2015. To the extent eligible employees are terminated, our subsidiary in Korea would be required to make lump-sum severance payments on behalf of these eligible employees for service provided prior to August 1, 2015. Factors used to determine severance benefits include employees’ length of service, seniority and rate of pay. The employees’ length of service and seniority are fixed as of July 31, 2015. The employees’ rate of pay is adjusted to the rate of pay at the time of termination. Accrued severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date. Our contributions to the National Pension Plan of the Republic of Korea are deducted from accrued severance benefit liabilities. On August 1, 2015, our subsidiary in Korea began sponsoring a defined benefit pension plan and a defined contribution plan. Existing employees at that time were given the option of choosing either a defined benefit pension plan or a defined contribution plan for their future benefits and new employees since that date are enrolled in a defined contribution plan.

The changes to the balance of our accrued severance plan obligations are as follows:


	For the Year Ended December 31,
	2024		2023
	(In thousands)
Balance at January 1	$	47,906	$	56,289
Provision of severance benefits	3,142		1,653
Severance payments	(1,416)		(8,770)
Foreign currency (gain) loss	(6,194)		(1,266)
Balance at December 31	43,438		47,906
Payments remaining with the National Pension Fund	(101)		(119)
Total accrued severance plan obligations at December 31	43,337		47,787
Less current portion of accrued severance plan obligations (Note 10) (1)	12,231		7,906
Non-current portion of accrued severance plan obligations	$	31,106	$	39,881

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Korea, Malaysia, the Philippines and Taiwan sponsor defined benefit plans (the “Plans”). Charges to expense are based upon actuarial analyses. The following table summarizes the changes to the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2024 and 2023:


	For the Year Ended December 31,
	2024		2023
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at January 1	$	164,281	$	159,760
Service cost	13,645		15,032
Interest cost	5,718		6,202
Benefits paid	(11,320)		(14,056)
Actuarial (gain) loss	2,458		4,150



Effects of curtailment	(320)		(617)
Settlement	(883)		(1,073)
Foreign exchange (gain) loss	(14,423)		(5,117)
Projected benefit obligation at December 31	159,156		164,281
Change in plan assets:
Fair value of plan assets at January 1	129,196		127,338
Actual gain (loss) on plan assets	8,918		12,325
Employer contributions	12,165		7,368

Settlement	(883)		(1,073)
Benefits paid	(11,320)		(14,056)
Foreign exchange gain (loss)	(12,794)		(2,706)
Fair value of plan assets at December 31	125,282		129,196
Funded status of the Plans at December 31	$	(33,874)	$	(35,085)


	December 31,
	2024		2023
	(In thousands)
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost (included in non-current assets)	$	5,991	$	12,039
Accrued benefit liability (included in pension and severance obligations) (1)	(39,865)		(47,124)
Net amount recognized at year end	$	(33,874)	$	(35,085)

(1)As of December 31, 2024, $0.9 million was recognized in accrued expenses.

The accumulated benefit obligation as of December 31, 2024 and 2023 was $123.4 million and $128.3 million, respectively.

The following table summarizes, by component, the change in accumulated other comprehensive income (loss), net of tax related to our Plans:


	Prior Service Cost		Actuarial Net Gain (Loss)		Total
	(In thousands)
Balance at December 31, 2022	$	602	$	13,618	$	14,220
Amortization and settlement gain included in net periodic pension cost	—		(46)		(46)
Net gain (loss) arising during period	—		1,731		1,731
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income (loss)	—		1,685		1,685
Balance at December 31, 2023	$	602	$	15,303	$	15,905
Amortization and settlement gain included in net periodic pension cost	—		(388)		(388)
Net gain (loss) arising during period	—		1,053		1,053
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income (loss)	—		665		665
Balance at December 31, 2024	$	602	$	15,968	$	16,570

Information for pension plans with benefit obligations in excess of plan assets is as follows:


	December 31,
	2024		2023
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	92,191	$	100,662
Aggregate fair value of plan assets	52,326		53,539
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	55,646		60,638
Aggregate fair value of plan assets	20,122		21,304

The following table summarizes total pension expense:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	13,645	$	15,032	$	20,072
Interest cost	5,718		6,202		4,731
Expected return on plan assets	(5,554)		(5,144)		(5,605)

Recognized actuarial (gain) loss	(462)		(156)		53
Net periodic pension cost	13,347		15,934		19,251
Curtailment (gain) loss	(320)		(617)		—
Settlement (gain) loss	33		132		(1,374)
Total pension expense	$	13,060	$	15,449	$	17,877

The components of net periodic pension cost other than the service cost component are included in other (income) expense, net in our Consolidated Statements of Income.

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligations:


	For the Year Ended December 31,
	2024		2023		2022
Discount rate for determining net periodic pension cost	3.8	%	4.2	%	2.6	%
Discount rate for determining benefit obligations at December 31	3.8	%	3.8	%	4.2	%
Rate of compensation increase for determining net periodic pension cost	3.7	%	3.6	%	3.7	%
Rate of compensation increase for determining benefit obligations at December 31	3.8	%	3.7	%	3.6	%
Expected rate of return on plan assets for determining net periodic pension cost	4.5	%	4.1	%	3.8	%

The measurement date for determining the Plans’ assets and benefit obligations is December 31, each year. Discount rates are generally derived from yield curves constructed from high-quality corporate or foreign government bonds, for which the timing and amount of cash outflows approximate the estimated payouts.

The expected rate of return assumption is based on weighted-average expected returns for each asset class. Expected returns reflect a combination of historical performance analysis and the forward-looking views of the financial markets and include input from our actuaries. We have no control over the direction of our investments in our defined benefit plans in Taiwan as the local Labor Standards Law Fund mandates such contributions into a cash account balance at the Bank of Taiwan. Our defined benefit pension plan in Malaysia is a non-funded plan, and as such, no asset exists related to this plan. Our investment strategies for our defined benefit plans in Japan, Korea and the Philippines are based on long-term, sustained asset growth through low to medium risk investments. The current rate of return assumption targets are based on asset allocation strategies as follows:


	Allocation
	Debt		Equity		Other
Japan defined benefit plan	64	%	34	%	2	%
Korea defined benefit plan	30	%	20	%	50	%
Philippine defined benefit plan	50	%	45	%	5	%

The fair value of our pension plan assets, by asset category utilizing the fair value hierarchy as discussed in Note 16, is as follows:


	December 31, 2024				December 31, 2023
	Level 1		Level 2		Total		Level 1		Level 2		Total
	(In thousands)				(In thousands)
Cash and cash equivalents	$	749	$	—	$	749	$	217	$	—	$	217
Equity securities	14,276		—		14,276		13,680		—		13,680
Debt securities
Government bonds	3,712		—		3,712		3,674		—		3,674
Corporate bonds	1,259		—		1,259		1,130		—		1,130
Treasury notes	11,881		—		11,881		11,993		—		11,993
Mutual and commingled funds
Equity funds	11,950		7,270		19,220		29,016		7,807		36,823
Debt funds	18,210		12,516		30,726		12,031		13,163		25,194
Guaranteed investment contracts	—		30,365		30,365		—		23,189		23,189
Taiwan retirement fund	12,428		—		12,428		12,478		—		12,478
Other, net	—		666		666		—		818		818
Total fair value of pension plan assets	$	74,465	$	50,817	$	125,282	$	84,219	$	44,977	$	129,196

The Taiwan retirement fund category of our plan assets represents accounts that our subsidiaries in Taiwan have in a government labor retirement fund in the custody of the Bank of Taiwan. The accounts earn a minimum guaranteed rate of return and are invested in a mix of cash, domestic and foreign equity securities and domestic and foreign debt securities.

We expect to make contributions of approximately $10 million during 2025. We closely monitor the funded status of the Plans with respect to legislative requirements. We intend to make at least the minimum contribution required by law each year.

The estimated future benefit payments related to our foreign defined benefit plans are as follows:


	Payments
	(In thousands)
2025	$	9,307
2026	11,145
2027	13,419
2028	14,037
2029	13,922
2030 to 2034	97,256

Defined Contribution Plans

We sponsor defined contribution plans in Korea, Malaysia, Taiwan and the U.S. Total defined contribution expense was $26.5 million, $27.0 million and $24.2 million for 2024, 2023 and 2022, respectively.

Earnings Per Share

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted-average number of common shares outstanding during the period. The weighted-average number of common shares outstanding is reduced for treasury stock.

Diluted EPS is computed based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, PSUs, RSUs and unvested restricted shares.

The following table summarizes the computations of basic and diluted EPS:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands, except per share data)





Net income attributable to Amkor common stockholders	$	354,012	$	359,813	$	765,823

Weighted-average number of common shares outstanding — basic	246,344		245,628		244,676
Effect of dilutive securities:
Share-based awards	1,474		1,548		1,529
Weighted-average number of common shares outstanding — diluted	247,818		247,176		246,205
Net income attributable to Amkor per common share:
Basic	$	1.44	$	1.46	$	3.13
Diluted	$	1.43	$	1.46	$	3.11

The following table summarizes the potential shares of common stock that were excluded from diluted EPS, because the effect of including these potential shares was anti-dilutive:


	For the Year Ended December 31,
	2024	2023	2022
	(In thousands)
Share-based awards	—	2	180

Pension and Severance Plans (Schedule of Accrued Severance Obligation) (Details) - Korean Severance Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance at beginning of the year	$ 47,906	$ 56,289
Provision of severance benefits	3,142	1,653
Severance payments	(1,416)	(8,770)
Foreign currency (gain) loss	(6,194)	(1,266)
Balance at the end of year	43,438	47,906
Payments remaining with the National Pension Fund	(101)	(119)
Total accrued severance plan obligations at December 31	43,337	47,787
Less current portion of accrued severance plan obligations (Note 10)	12,231	7,906
Non-current portion of accrued severance plan obligations	31,106	$ 39,881
Postemployment benefit liability, current, converted to defined contribution plan	$ 5,000

Description of Business and Summary of Significant Accounting Policies (Schedule of Property, Plant and Equipment) (Details)	Dec. 31, 2024
Buildings and improvements \| Minimum
Summary of Significant Accounting Policies [Line Items]
Useful life	10 years
Buildings and improvements \| Maximum
Summary of Significant Accounting Policies [Line Items]
Useful life	40 years
Machinery and equipment \| Minimum
Summary of Significant Accounting Policies [Line Items]
Useful life	2 years
Machinery and equipment \| Maximum
Summary of Significant Accounting Policies [Line Items]
Useful life	7 years
Software and computer equipment \| Minimum
Summary of Significant Accounting Policies [Line Items]
Useful life	3 years
Software and computer equipment \| Maximum
Summary of Significant Accounting Policies [Line Items]
Useful life	5 years
Furniture, fixtures and other equipment \| Minimum
Summary of Significant Accounting Policies [Line Items]
Useful life	4 years
Furniture, fixtures and other equipment \| Maximum
Summary of Significant Accounting Policies [Line Items]
Useful life	10 years

Debt (Schedule of Short-term Borrowings and Long-term Debt) (Details) $ in Thousands, ¥ in Billions		1 Months Ended			12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 JPY (¥)	Dec. 31, 2023 USD ($) installment	Dec. 31, 2024 USD ($)	Dec. 31, 2024 KRW (₩)	May 31, 2024 USD ($)	Mar. 31, 2022 USD ($)	Apr. 30, 2021 KRW (₩) borrowing
Debt Instrument [Line Items]
Total debt	$ 1,209,785	$ 1,164,462		$ 1,209,785	$ 1,164,462
Less: Unamortized discount and deferred debt costs, net	(6,329)	(5,002)		(6,329)	(5,002)
Less: Short-term borrowings and current portion of long-term debt	(131,624)	(236,029)		(131,624)	(236,029)
Long-term debt	1,071,832	$ 923,431		1,071,832	$ 923,431
6.625% Senior notes, due September 2027 \| Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)		6.625%			6.625%	6.625%
Total debt	525,000	$ 525,000		525,000	$ 525,000
Term Loan Fixed Rate at 3.95% due May 2027 \| Subsidiary Term Loans \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)		3.95%			3.95%	3.95%
Total debt	0	$ 0		0	$ 0
Amount of debt agreement \| ₩									₩ 80,000,000,000
Number of annual borrowings \| borrowing									6
Amount of unused borrowing capacity		$ 54,000			54,000	₩ 80,000,000,000.0	$ 59,000
Proceeds from long-term debt					$ 58,700
Term loan, fixed rate at 2.12%, due December 2028 \| Subsidiary Term Loans \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)		2.12%			2.12%	2.12%
Total debt	200,000	$ 200,000		200,000	$ 200,000
Short-term Term Loans, Variable Rate \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Total debt	5,098	0		5,098	0
Amount of unused borrowing capacity		$ 6,000			$ 6,000
Term loan, fixed rate at 1.35%, due December 2024 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		1.35%			1.35%	1.35%
Total debt	40,414	$ 0		40,414	$ 0
Term loan, fixed rate at 1.20%, due December 2025 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		1.20%			1.20%	1.20%
Total debt	30,913	$ 13,868		30,913	$ 13,868
Term loan, fixed rate at 1.23%, due December 2026 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		1.23%			1.23%	1.23%
Total debt	55,729	$ 33,333		55,729	$ 33,333
Term loan, fixed rate at 1.59%, due December 2027 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		1.59%			1.59%	1.59%
Total debt	89,053	$ 59,923		89,053	$ 59,923
Term loan, fixed rate at 1.80%, due December 2028 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		1.80%			1.80%	1.80%
Total debt	124,078	$ 89,059		124,078	$ 89,059
Term loan, fixed rate at 2.05%, due December 2029 \| Subsidiary Term Loans \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)		2.05%			2.05%	2.05%
Total debt	0	$ 108,779		$ 0	$ 108,779
Proceeds from long-term debt		113,900	¥ 17.1
Number of quarterly installments \| installment				20
Term Loan, SOFR Plus 0.75% Due June 2025 \| Subsidiary Term Loans \| China
Debt Instrument [Line Items]
Interest rate spread (as a percent)					0.75%
Total debt	37,000	35,000		$ 37,000	$ 35,000
Term Loan, SOFR Plus 0.75% Due 2025 \| Subsidiary Term Loans \| China
Debt Instrument [Line Items]
Interest rate spread (as a percent)					0.75%
Total debt	$ 57,500	55,500		57,500	$ 55,500
Term Loans, SOFR Plus 0.95%, Due December 2026 \| Subsidiary Term Loans \| China
Debt Instrument [Line Items]
Interest rate spread (as a percent)	1.40%				0.95%
Total debt	$ 45,000	$ 44,000		45,000	$ 44,000
Senior Secured Revolving Credit Facility, Applicable Bank Rate Plus 1.75%, Due March 2027 (Singapore) \| Line of Credit \| Singapore \| Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate (as a percent)		1.75%			1.75%	1.75%
Total debt	$ 0	$ 0		$ 0	$ 0
Credit facility, borrowing capacity								$ 600,000
Credit facility, base amount								$ 250,000
Credit facility percentage of variable borrowings								37.50%
Remaining borrowing capacity		$ 600,000			$ 600,000
Term Loan, fixed rate at 1.85%, Due April2024 \| Subsidiary Term Loans \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)		1.85%			1.85%	1.85%
Number of annual borrowings \| borrowing									6

Share-Based Compensation Plans (Schedule of Restricted Shares and RSU and PSU Activity) (Details) - Restricted Stock Units (RSUs) & Performance Stock Units (PSUs) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Nonvested beginning balance (in shares)	1,307	738	286
Awards granted (in shares)	1,026	1,049	531
Awards vested (in shares)	(489)	(464)	(22)
Awards forfeited (in shares)	(217)	(16)	(57)
Nonvested ending balance (in shares)	1,627	1,307	738
Weighted- average Grant Date Fair Value
Nonvested beginning balance (in dollars per share)	$ 25.87	$ 22.34	$ 22.48
Awards granted (in dollars per share)	29.00	26.72	22.29
Awards vested (in dollars per share)	27.37	22.19	22.23
Awards forfeited (in dollars per share)	24.62	25.24	22.63
Nonvested ending balance (in dollars per share)	$ 27.56	$ 25.87	$ 22.34

Income Taxes

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Income Taxes

Geographic sources of income (loss) before taxes are as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
United States	$	81,289	$	94,643	$	81,488
Foreign	349,727		349,198		775,444
Income before taxes	$	431,016	$	443,841	$	856,932

The components of the provision (benefit) for income taxes are as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Current:
Federal	$	7,898	$	19,831	$	40,063
State	34		7		150
Foreign	68,333		48,478		61,300
	76,265		68,316		101,513
Deferred:
Federal	153		8,899		(10,156)
State	(501)		1		1,458
Foreign	(436)		4,494		(2,925)
	(784)		13,394		(11,623)
Income tax expense	$	75,481	$	81,710	$	89,890

The reconciliation between the U.S. federal statutory income tax rate of 21% and our effective tax rate is as follows:


	For the Year Ended December 31,
	2024		2023		2022
U.S. federal statutory income tax rate	21.0	%	21.0	%	21.0	%

Foreign income taxed at different rates	(2.1)		(4.2)		(12.0)
Foreign exchange (loss) gain	1.4		0.5		2.2

Change in valuation allowance	(1.8)		2.9		(2.4)

Income tax credits generated	(6.8)		(7.5)		(6.1)
Foreign earnings and profits	3.5		7.0		9.0
Foreign derived intangible income	(1.8)		(1.6)		(0.9)

Settlements and changes in uncertain tax positions	3.8		(0.5)		(0.2)
Other	0.3		0.8		(0.1)
Income tax expense	17.5	%	18.4	%	10.5	%

In 2022, we reversed $17.8 million of valuation allowance recorded against U.S. foreign tax credit carryforwards previously projected to expire unused due to the limitations to utilize the credits under current tax law. Realization of these carryforwards is dependent on generating sufficient taxable income to overcome the foreign tax credit limitation provisions. Although utilization of these carryforwards is not assured, in light of our current earnings and recent

estimates of future taxable income, management believes sufficient positive evidence exists to conclude that the respective valuation allowances are no longer needed, resulting in the reversal of these valuation allowances.

As a result of certain capital investments, export commitments and employment levels, income from operations in Korea, Singapore and Vietnam was subject to reduced income tax rates and, in some cases, was exempt from income taxes. The most significant tax rate impact is in Singapore where we have been granted a conditional reduced tax rate that expires at the end of 2028. We recognized $33.2 million, $18.6 million and $84.5 million in tax benefits as a result of the conditional reduced tax rates in 2024, 2023 and 2022, respectively. The benefit of the conditional reduced tax rates on diluted earnings per share was approximately $0.13, $0.08 and $0.34 for 2024, 2023 and 2022, respectively.

The following is a summary of the components of our deferred tax assets and liabilities:


	December 31,
	2024		2023
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	21,420	$	33,679

Tax credit carryforwards	69,373		88,147
Property, plant and equipment	18,512		21,387
Deferred interest expense	446		476
Accrued liabilities	37,968		37,832
Receivable	27,284		30,086
Unrealized foreign exchange loss	23,769		7,205
Operating lease liabilities	14,825		16,053
Other	14,203		15,219
Total deferred tax assets	227,800		250,084
Valuation allowance	(107,113)		(114,811)
Total deferred tax assets net of valuation allowance	120,687		135,273
Deferred tax liabilities:
Property, plant and equipment	27,442		34,206
Deferred gain	3,341		5,739
Unrealized foreign exchange gain	6,674		3,129
Unbilled receivables	6,508		8,995
Operating lease right of use assets	14,240		16,031
Other	6,560		5,533
Total deferred tax liabilities	64,765		73,633
Net deferred tax assets	$	55,922	$	61,640
Recognized as:
Other assets	$	72,488	$	73,585
Other non-current liabilities	(16,566)		(11,945)
Total	$	55,922	$	61,640

Valuation allowance against deferred tax assets consist of the following:


	December 31,
	2024		2023
	(In thousands)
Valuation allowance:
U.S.	$	44,853	$	44,426
Foreign	62,260		70,385
Total valuation allowance	$	107,113	$	114,811

Our net operating loss carryforwards are as follows:


	December 31,
	2024		2023		Expiration
	(In thousands)
U.S. federal net operating loss carryforwards	$	—	$	5,611	2024
U.S. state net operating loss carryforwards	27,334		32,612		2025-2036
Foreign net operating loss carryforwards	207,203		196,636		2025-2031

At December 31, 2024 and 2023, a portion of our remaining U.S. federal net operating loss carryforwards was reserved with a valuation allowance due to ownership change limitations from a prior year acquisition as well as certain state net operating loss carryforwards expected to expire unused. Also, we have a valuation allowance against foreign net operating loss carryforwards that we do not expect to have sufficient taxable income to realize as of December 31, 2024 and 2023.

Our tax credit carryforwards are as follows:


	December 31,
	2024		2023		Expiration
	(In thousands)
U.S. Foreign Tax Credits	$	49,639	$	51,512	2027-2034
U.S. Other Tax Credits	3,817		2,559		2026-2034
Foreign Tax Credits	19,543		34,546		2025-2034

At December 31, 2024 and 2023, a portion of our U.S. and foreign tax credit carryforwards were reserved with a valuation allowance for the amount expected to expire unused.

Distributions of cash to the U.S. as dividends generally will not be subject to U.S. federal income tax. We have not provided foreign withholding taxes or state income taxes on the undistributed earnings of our foreign subsidiaries, over which we have sufficient influence to control the distribution of such earnings and have determined that substantially all such earnings have been reinvested indefinitely. These earnings could become subject to foreign withholding tax if they are remitted as dividends. For the year ended December 31, 2024, we estimate that repatriation of these foreign earnings would generate withholding taxes and state income taxes of approximately $160 million.

We operate in and file income tax returns in various U.S. and foreign jurisdictions which are subject to examination by tax authorities. We have tax returns that are open to examination in various jurisdictions for tax years 2013-2024. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits. There can be no assurance that the outcome of examinations will be favorable. Our unrecognized tax benefits are subject to change as examinations of specific tax years are completed in the respective jurisdictions. In certain circumstances where we elect to appeal the results of an

examination, we may be required to make tax assessment payments to proceed with the administrative appeal process. Current examinations include 2017-2021 Malaysia income tax returns and 2021 Philippine income tax return.

A reconciliation of the beginning and ending gross amount of unrecognized tax benefits is as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Balance at January 1	$	31,537	$	33,253	$	37,293
Additions based on tax positions related to the current year	7,260		—		1,519
Additions for tax positions of prior years	3,761		495		1,909
Reductions for tax positions of prior years	(4,992)		(345)		(5,755)
Reductions related to settlements with tax authorities	(789)		—		(988)
Reductions from lapse of statutes of limitations	(461)		(1,866)		(725)
Balance at December 31	$	36,316	$	31,537	$	33,253

The net increase in our unrecognized tax benefits was $4.8 million from December 31, 2023 to December 31, 2024. The increase was primarily related to income attribution. At December 31, 2024, $32.7 million of our gross unrecognized tax benefits would reduce our effective tax rate, if recognized. It is reasonably possible that unrecognized tax benefits primarily related to income attribution will decrease in the next 12 months by up to $6.6 million due to the lapse of statutes of limitations in foreign jurisdictions.

The liability related to our unrecognized tax benefits, before interest and penalties, was $21.9 million as of December 31, 2024 and is reported as a component of other non-current liabilities. The unrecognized tax benefits presented in the table above also include positions that have reduced deferred tax assets by $14.4 million. The balance of accrued and unpaid interest and penalties was $4.5 million as of December 31, 2024 and 2023 and is included as a component of other non-current liabilities in connection with our unrecognized tax benefits.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

Earnings Per Share (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 354,012	$ 359,813	$ 765,823
Net income attributable to Amkor common stockholders, diluted	$ 354,012	$ 359,813	$ 765,823
Weighted-average number of common shares outstanding — basic (in shares)	246,344	245,628	244,676
Effect of dilutive securities:
Share-based awards (in shares)	1,474	1,548	1,529
Weighted-average number of common shares outstanding — diluted (in shares)	247,818	247,176	246,205
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 1.44	$ 1.46	$ 3.13
Diluted (in dollars per share)	$ 1.43	$ 1.46	$ 3.11

Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 114,811	$ 101,869	$ 122,357
Additions (Credited) Charged to Expense	(3,633)	15,838	(17,762)
Write-offs	(4,065)	(2,896)	(2,726)
Balance at End of Period	$ 107,113	$ 114,811	$ 101,869

Fair Value Measurements

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data. For our Level 2 short-term investments, we consider factors such as actual trade data, benchmark yields, broker/dealer quotes, and other similar data obtained from quoted market prices and independent pricing vendors to determine the fair value of these assets and liabilities.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of certain other non-current assets and liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include restricted cash money market funds and short-term investments, including investments classified as cash equivalents. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits.

Our derivative financial instruments are valued using quoted market prices for similar assets. Counterparties to these derivative contracts are highly rated financial institutions.

We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of our debt:


	December 31, 2024				December 31, 2023
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	525,562	$	522,615	$	531,778	$	521,839
Revolving credit facilities and term loans (Level 2)	625,818		636,845		666,316		681,617
Total debt	$	1,151,380	$	1,159,460	$	1,198,094	$	1,203,456

The estimated fair value of our senior notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our revolving credit facilities and term loans is calculated using a discounted cash flow analysis, which utilizes market-based assumptions including forward interest rates adjusted for credit risk.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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+ Details

Debt (Narrative) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Collateralized debt	$ 639.5
Asset Pledged as Collateral
Debt Instrument [Line Items]
Collateralized debt	$ 286.1

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Section 50
-Paragraph 1B
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 26: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 27: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

+ Details

Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Dividends Payable [Line Items]
Dividends per share, declared (in dollars per share)			$ 0.72440	$ 0.30375	$ 0.225
Special cash dividends			$ 178,711	$ 74,626	$ 55,118
O 2024 Q4 Dividends
Dividends Payable [Line Items]
Dividends per share, declared (in dollars per share)		$ 0.08269
Increase of quarterly dividends, percentage	5.00%
S 2024 Q4 Dividends
Dividends Payable [Line Items]
Dividends per share, declared (in dollars per share)		$ 0.40546
Special cash dividends			$ 100,000

Investments (Schedule of Cash Equivalents, and Short term Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Total, amortized cost	$ 726,061	$ 581,367
Total, gross unrealized gains	845	615
Total, gross unrealized losses	(1,352)	(409)
Total, fair value	725,554	581,573
Proceeds from sale of cash equivalent investments	29,800	47,000	$ 29,600
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	509,067	469,451
Short-term investments, gross unrealized gains	841	615
Short-term investments, gross unrealized losses	(1,352)	(409)
Short-term investments, fair value	508,556	469,657
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	63,256	65,340
Short-term investments, gross unrealized gains	168	170
Short-term investments, gross unrealized losses	(1,038)	(22)
Short-term investments, fair value	62,386	65,488
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	15,121	17,086
Short-term investments, gross unrealized gains	0	0
Short-term investments, gross unrealized losses	0	0
Short-term investments, fair value	15,121	17,086
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	36,829	56,273
Short-term investments, gross unrealized gains	0	0
Short-term investments, gross unrealized losses	0	0
Short-term investments, fair value	36,829	56,273
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	258,191	251,671
Short-term investments, gross unrealized gains	567	432
Short-term investments, gross unrealized losses	(101)	(299)
Short-term investments, fair value	258,657	251,804
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	1,590
Short-term investments, gross unrealized gains	0
Short-term investments, gross unrealized losses	0
Short-term investments, fair value	1,590
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	11,159
Short-term investments, gross unrealized gains	2
Short-term investments, gross unrealized losses	(18)
Short-term investments, fair value	11,143
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	1,007
Short-term investments, gross unrealized gains	2
Short-term investments, gross unrealized losses	0
Short-term investments, fair value	1,009
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	11,392	13,200
Short-term investments, gross unrealized gains	0	0
Short-term investments, gross unrealized losses	(25)	(9)
Short-term investments, fair value	11,367	13,191
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost	110,522	65,881
Short-term investments, gross unrealized gains	102	13
Short-term investments, gross unrealized losses	(170)	(79)
Short-term investments, fair value	110,454	65,815
Level 1
Debt Securities, Available-for-sale [Line Items]
Total, fair value	288,708	146,616
Level 1 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	125,575	82,901
Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	15,121	17,086
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Level 1 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0
Level 1 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0
Level 1 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0
Level 1 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	110,454	65,815
Level 2
Debt Securities, Available-for-sale [Line Items]
Total, fair value	436,846	434,957
Level 2 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	382,981	386,756
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	62,386	65,488
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	36,829	56,273
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	258,657	251,804
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	1,590
Level 2 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	11,143
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	1,009
Level 2 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	11,367	13,191
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, fair value	0	0
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	216,994	111,916
Cash equivalents, gross unrealized gains	4	0
Cash equivalents, gross unrealized losses	0	0
Cash equivalent, fair value	216,998	111,916
Cash equivalents \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	163,133	63,715
Cash equivalents \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	53,865	48,201
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost		138
Cash equivalents, gross unrealized gains		0
Cash equivalents, gross unrealized losses		0
Cash equivalent, fair value		138
Asset-backed securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value		0
Asset-backed securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value		138
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	53,110	48,063
Cash equivalents, gross unrealized gains	0	0
Cash equivalents, gross unrealized losses	0	0
Cash equivalent, fair value	53,110	48,063
Commercial paper \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	0	0
Commercial paper \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	53,110	48,063
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	755
Cash equivalents, gross unrealized gains	0
Cash equivalents, gross unrealized losses	0
Cash equivalent, fair value	755
Corporate bonds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	0
Corporate bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	755
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	146,679	60,719
Cash equivalents, gross unrealized gains	0	0
Cash equivalents, gross unrealized losses	0	0
Cash equivalent, fair value	146,679	60,719
Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	146,679	60,719
Money market funds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	0	0
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	16,450	2,996
Cash equivalents, gross unrealized gains	4	0
Cash equivalents, gross unrealized losses	0	0
Cash equivalent, fair value	16,454	2,996
U.S. government bonds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	16,454	2,996
U.S. government bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, fair value	$ 0	$ 0

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial. Legal Proceedings We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. Although the outcome of these matters is uncertain, we believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact to us. Our evaluation of the potential impact of these claims and legal proceedings on our business, liquidity, results of operations, financial condition or cash flows could change in the future.

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2024

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:


	December 31,
	2024		2023
	(In thousands)
Payroll and benefits	$	121,683	$	115,604
Deferred revenue and customer advances	59,656		71,117
Short-term finance lease liability	55,613		57,761
Income taxes payable	35,067		35,215
Accrued pension and severance obligations (Note 12)	13,091		7,906
Accrued interest	11,487		11,175
Other accrued expenses	59,740		59,636
Total accrued expenses	$	356,337	$	358,414

Leases (Tables)

12 Months Ended

Dec. 31, 2024

Leases [Abstract]

Schedule of Components of Lease Expense

The components of lease expense were as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Operating lease cost	$	40,110	$	70,722	$	81,410
Finance lease cost
Amortization of leased assets	35,290		42,345		24,644
Interest on lease liabilities	9,138		5,521		3,891
Total finance lease cost	44,428		47,866		28,535
Short-term lease cost	4,599		4,788		5,749
Variable lease cost	7,409		6,921		6,592
Net lease cost	$	96,546	$	130,297	$	122,286

Other information related to leases was as follows:


	For the Year Ended December 31,
	2024			2023			2022
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	39,111		$	73,774		$	81,044
Operating cash flows for finance leases	8,736			5,419			3,933
Financing cash flows for finance leases	72,255			66,398			40,673

Weighted Average Remaining Lease Term (years)
Operating leases	6.0			6.1			4.2
Finance leases	3.9			3.2			2.3

Weighted Average Discount Rate
Operating leases	5.8		%	5.2		%	4.4		%
Finance leases	6.3		%	5.7		%	4.1		%

Schedule of Maturity of Operating Lease Liabilities

Maturities of lease liabilities were as follows:


	December 31, 2024
	Operating Leases		Finance Leases
	(In thousands)
2025	$	30,852	$	65,666
2026	23,072		52,194
2027	16,258		32,624
2028	6,615		17,433
2029	4,803		23,836
Thereafter	16,884		12,618
Total future minimum lease payments	98,484		204,371
Less: Imputed interest	(13,674)		(26,050)
Total	$	84,810	$	178,321

Schedule of Maturity of Finance Lease Liabilities

Maturities of lease liabilities were as follows:


	December 31, 2024
	Operating Leases		Finance Leases
	(In thousands)
2025	$	30,852	$	65,666
2026	23,072		52,194
2027	16,258		32,624
2028	6,615		17,433
2029	4,803		23,836
Thereafter	16,884		12,618
Total future minimum lease payments	98,484		204,371
Less: Imputed interest	(13,674)		(26,050)
Total	$	84,810	$	178,321

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2024
Audit Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Phoenix, Arizona
Auditor Firm ID	238

Income Taxes (Schedule of Income Before Income Tax, Domestic and Foreign) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Geographic sources of income (loss) before income taxes
United States	$ 81,289	$ 94,643	$ 81,488
Foreign	349,727	349,198	775,444
Income before taxes	$ 431,016	$ 443,841	$ 856,932

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 7: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Pension and Severance Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 125,282	$ 129,196	$ 127,338
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74,465	84,219
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	50,817	44,977
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	749	217
Cash and cash equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	749	217
Cash and cash equivalents \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,276	13,680
Equity securities \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,276	13,680
Equity securities \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,712	3,674
Government bonds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,712	3,674
Government bonds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,259	1,130
Corporate bonds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,259	1,130
Corporate bonds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Treasury notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,881	11,993
Treasury notes \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,881	11,993
Treasury notes \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,220	36,823
Equity funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,950	29,016
Equity funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,270	7,807
Debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,726	25,194
Debt funds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,210	12,031
Debt funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,516	13,163
Guaranteed investment contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,365	23,189
Guaranteed investment contracts \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Guaranteed investment contracts \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30,365	23,189
Taiwan retirement fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,428	12,478
Taiwan retirement fund \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,428	12,478
Taiwan retirement fund \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other, net
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	666	818
Other, net \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other, net \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 666	$ 818
Japan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	64.00%
Japan \| Other, net
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	2.00%
Japan \| Equity funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	34.00%
Korea \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	30.00%
Korea \| Other, net
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	50.00%
Korea \| Equity funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	20.00%
Philippines \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	50.00%
Philippines \| Other, net
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	5.00%
Philippines \| Equity funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	45.00%

Business Segments, Customer Concentrations and Geographic Information (Schedule of Property, Plant and Equipment, Net, Based on Physical Location) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 3,576,148	$ 3,299,445
China
Segment Reporting Information [Line Items]
Property, plant and equipment, net	308,889	385,544
Japan
Segment Reporting Information [Line Items]
Property, plant and equipment, net	139,126	143,399
Korea
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,923,953	1,781,632
Malaysia
Segment Reporting Information [Line Items]
Property, plant and equipment, net	55,166	51,164
Philippines
Segment Reporting Information [Line Items]
Property, plant and equipment, net	172,180	183,430
Portugal
Segment Reporting Information [Line Items]
Property, plant and equipment, net	130,653	108,982
Taiwan
Segment Reporting Information [Line Items]
Property, plant and equipment, net	322,539	272,428
Vietnam
Segment Reporting Information [Line Items]
Property, plant and equipment, net	471,581	365,059
Other foreign countries
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,553	272
Total foreign countries
Segment Reporting Information [Line Items]
Property, plant and equipment, net	3,525,640	3,291,910
United States
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 50,508	$ 7,535

Property, Plant and Equipment (Schedule of Depreciation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 594,141	$ 630,941	$ 612,105

Business Segments, Customer Concentrations and Geographic Information

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Business Segments, Customer Concentrations and Geographic Information

We operate as a single operating segment as managed by our Chief Executive Officer, who is considered our chief operating decision maker (“CODM”). The CODM bears the ultimate responsibility for, and is actively engaged in, the allocation of resources and the evaluation of our operating and financial results. We have concluded that we have a single operating segment based on the following:

•We are managed under a functionally-based organizational structure with the head of each function reporting directly to the CODM;

•Our CODM assesses performance, including resource allocation, trend identification and variance analysis, based on consolidated operating performance and financial results based on net income;

•Our CODM allocates resources and makes other operating decisions based on specific customer business opportunities; and

•We have an integrated process for the design, development and manufacturing services we provide to all of our customers. We also have centralized sales and administrative functions.

The following table presents revenue, profit or loss and significant segment expenses for our single operating segment:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Net sales	$	6,317,692	$	6,503,065	$	7,091,585
Less:
Materials cost of sales	3,478,752		3,584,090		3,646,188
Labor cost of sales	628,201		643,993		712,070
Depreciation cost of sales	534,921		576,120		565,455
Other cost of sales	742,606		755,709		837,885
Selling, general and administrative	331,806		295,393		283,372
Research and development	162,951		177,473		149,429
Interest expense	64,945		59,000		58,563
Income tax expense	75,481		81,710		89,890
Other segment items (1)	(57,506)		(32,554)		(18,309)
Segment net income	$	355,535	$	362,131	$	767,042

(1)Other segment items included in segment net income includes interest income, foreign currency (gain) loss, net, loss on debt retirement and other (income) expense.

The following table represents other balances included in net income or that are regularly provided to the CODM:


	December 31,
	2024		2023		2022
	(In thousands)
Interest income	$	65,541	$	48,458	$	12,762
Depreciation and amortization expense	(594,663)		(631,508)		(612,702)
Total assets	6,944,328		6,771,125		6,821,757
Capital expenditures	(743,796)		(749,467)		(908,294)

Net sales by product group consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Advanced Products	$	5,174,459	$	5,032,859	$	5,367,589
Mainstream Products	1,143,233		1,470,206		1,723,996
Total net sales	$	6,317,692	$	6,503,065	$	7,091,585

(1)Advanced Products include flip chip, memory and wafer-level processing and related test services.

(2)Mainstream Products include all other wirebond packaging and related test services.

Net sales by end market consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
Communications (smartphones, tablets)	48	%	50	%	44	%
Computing (data center, infrastructure, PC/laptop, storage)	19	%	16	%	16	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	18	%	21	%	20	%
Consumer (AR & gaming, connected home, home electronics, wearables)	15	%	13	%	20	%
Total net sales	100	%	100	%	100	%

Net sales by region based on customer headquarters location consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Europe, Middle East and Africa	$	817,875	$	1,043,880	$	1,084,853
Japan	800,713		935,620		1,132,121
Asia Pacific (excluding Japan)	716,344		704,520		1,017,246
Total foreign countries	2,334,932		2,684,020		3,234,220
United States	3,982,760		3,819,045		3,857,365
Total net sales	$	6,317,692	$	6,503,065	$	7,091,585

In 2024, 2023 and 2022 one customer accounted for 30.8%, 27.7% and 20.6% of total net sales, respectively. In 2024 and 2022, a second customer accounted for 10.2% and 10.1% of total net sales, respectively.

Property, plant and equipment, net, based on physical location, consist of the following:


	December 31,
	2024		2023
	(In thousands)
China	$	308,889	$	385,544
Japan	139,126		143,399
Korea	1,923,953		1,781,632
Malaysia	55,166		51,164
Philippines	172,180		183,430
Portugal	130,653		108,982
Taiwan	322,539		272,428
Vietnam	471,581		365,059
Other foreign countries	1,553		272
Total foreign countries	3,525,640		3,291,910
United States	50,508		7,535
Total property, plant and equipment, net	$	3,576,148	$	3,299,445

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Investments

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Investments

The following table summarizes our cash equivalents and available-for-sale debt investments:


	December 31, 2024
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents


Commercial paper	$	53,110	$	—	$	—	$	53,110	$	—	$	53,110
Corporate bonds	755		—		—		755		—		755
Money market funds	146,679		—		—		146,679		146,679		—

U.S. government bonds	16,450		4		—		16,454		16,454		—

Total cash equivalents (2)	216,994		4		—		216,998		163,133		53,865

Short-term investments
Asset-backed securities	63,256		168		(1,038)		62,386		—		62,386
Certificate of deposits	15,121		—		—		15,121		15,121		—
Commercial paper	36,829		—		—		36,829		—		36,829
Corporate bonds	258,191		567		(101)		258,657		—		258,657
Foreign government bonds	1,590		—		—		1,590		—		1,590
Mortgage-backed securities	11,159		2		(18)		11,143		—		11,143
Municipal bonds	1,007		2		—		1,009		—		1,009
U.S. government agency bonds	11,392		—		(25)		11,367		—		11,367
U.S. government bonds	110,522		102		(170)		110,454		110,454		—

Total short-term investments	509,067		841		(1,352)		508,556		125,575		382,981
Total	$	726,061	$	845	$	(1,352)	$	725,554	$	288,708	$	436,846


	December 31, 2023
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents
Asset-backed securities	$	138	$	—	$	—	$	138	$	—	$	138
Commercial paper	48,063		—		—		48,063		—		48,063

Money market funds	60,719		—		—		60,719		60,719		—

US government bonds	2,996		—		—		2,996		2,996		—

Total cash equivalents (2)	111,916		—		—		111,916		63,715		48,201
Short-term investments
Asset-backed securities	65,340		170		(22)		65,488		—		65,488
Certificate of deposits	17,086		—		—		17,086		17,086		—
Commercial paper	56,273		—		—		56,273		—		56,273
Corporate bonds	251,671		432		(299)		251,804		—		251,804



U.S. government agency bonds	13,200		—		(9)		13,191		—		13,191
U.S. government bonds	65,881		13		(79)		65,815		65,815		—

Total short-term investments	469,451		615		(409)		469,657		82,901		386,756
Total	$	581,367	$	615	$	(409)	$	581,573	$	146,616	$	434,957

The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of December 31, 2024:


	Amortized Cost		Fair Value
Within 1 year	$	493,164	$	493,511
After 1 year through 5 years	158,482		158,514

Asset- and mortgage-backed securities	74,415		73,529

Total	$	726,061	$	725,554

Actual maturities can differ from contractual maturities due to various factors including whether the issuers have the right to call or prepay obligations without call or prepayment penalties, and we view our available-for-sale debt investments as available for current operations.

As of December 31, 2024, the amortized cost and fair market value of our held-to-maturity government bonds (Level 1) maturing within a year were $4.4 million. As of December 31, 2023 the amortized cost and fair market value of our held-to-maturity government bonds (Level 1) maturing within a year were $5.2 million.

Pension and Severance Plans (Schedule of Components of Net Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 13,645	$ 15,032	$ 20,072
Interest cost	5,718	6,202	4,731
Expected return on plan assets	(5,554)	(5,144)	(5,605)
Recognized actuarial (gain) loss	(462)	(156)	53
Net periodic pension cost	13,347	15,934	19,251
Curtailment (gain) loss	(320)	(617)	0
Settlement (gain) loss	33	132	(1,374)
Total pension expense	$ 13,060	$ 15,449	$ 17,877

Pension and Severance Plans (Schedule of Changes in Projected Benefit Obligations and Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in projected benefit obligation:
Projected benefit obligation at January 1	$ 164,281	$ 159,760
Service cost	13,645	15,032	$ 20,072
Interest cost	5,718	6,202	4,731
Benefits paid	(11,320)	(14,056)
Actuarial (gain) loss	2,458	4,150
Effects of curtailment	(320)	(617)
Settlement	(883)	(1,073)
Foreign exchange (gain) loss	(14,423)	(5,117)
Projected benefit obligation at December 31	159,156	164,281	159,760
Change in plan assets:
Fair value of plan assets at January 1	129,196	127,338
Actual gain (loss) on plan assets	8,918	12,325
Employer contributions	12,165	7,368
Settlement	(883)	(1,073)
Benefits paid	(11,320)	(14,056)
Foreign exchange gain (loss)	(12,794)	(2,706)
Fair value of plan assets at December 31	125,282	129,196	$ 127,338
Funded status of the Plans at December 31	$ (33,874)	$ (35,085)

Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Share-Based Compensation Plans

For the years ended December 31, 2024, 2023 and 2022, we recognized share-based compensation of $18.4 million, $8.3 million and $13.6 million, respectively, primarily in selling, general and administrative expenses. The amount of compensation expense to be recognized is adjusted for an estimated forfeiture rate which is based on historical data. The corresponding deferred income tax benefits are $2.4 million, $0.7 million and $1.7 million for 2024, 2023 and 2022, respectively.

Equity Incentive Plans

Second Amended and Restated 2007 Equity Incentive Plan. The Second Amended and Restated 2007 Equity Incentive Plan (as amended, the “2007 Plan”) provided for the grant of the following types of incentive awards: (i) stock options; (ii) restricted stock; (iii) restricted stock units; (iv) stock appreciation rights; (v) performance units and performance shares; and (vi) other stock or cash awards. Those eligible for awards included employees, directors and consultants who provide services to Amkor and its subsidiaries. There were originally 17.0 million shares of our common stock reserved for issuance under the 2007 Plan. No awards have been or will be granted under the 2007 Plan after the effective date of the 2021 Plan (as defined below), but all outstanding awards under the 2007 Plan will continue in full force and effect, subject to their original terms.

2021 Equity Incentive Plan. On May 18, 2021, at our 2021 Annual Meeting of Stockholders (the “2021 Annual Meeting”), our stockholders approved the Amkor Technology, Inc. 2021 Equity Incentive Plan (as amended, the “2021 Plan”) to replace the 2007 Plan. The 2021 Plan provides for the grant of the following types of incentive awards: (i) stock options; (ii) restricted stock; (iii) restricted stock units; (iv) stock appreciation rights; (v) performance units and performance shares; and (vi) other stock or cash awards. Those eligible for awards include employees, directors and consultants who provide services to Amkor and its subsidiaries. The number of shares authorized and available for issuance under the 2021 Plan is 23,100,000 shares, reduced for certain awards granted under the 2007 Plan after December 31, 2020, but before May 18, 2021. There were originally 22.8 million shares of our common stock reserved for issuance under the 2021 Plan, and at December 31, 2024, there were 19.4 million shares available for grant under the 2021 Plan.

Stock options

Stock options are generally granted with an exercise price equal to the market price of the stock at the date of grant. Substantially all of the options granted are exercisable pursuant to a one to four year vesting schedule, and the term of the options granted is no longer than ten years. Upon option exercise, we may issue new shares of common or treasury stock.

In order to calculate the fair value of stock options at the date of grant, we use the Black-Scholes option pricing model. Expected volatilities are based on historical performance of our stock. We also use historical data to estimate the timing and amount of option exercises and forfeitures within the valuation model. The expected term of the options is based on evaluations of historical and expected future employee exercise behavior and represents the period of time that options granted are expected to be outstanding. The risk-free interest rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The dividend yield is based on the annualized declared quarterly dividend rate divided by our closing stock price at the date of the grant. There have been no stock options granted since 2021.

The following table summarizes our stock option activity for the year ended December 31, 2024:


	Number of Shares (In thousands)	Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2023	2,031	$	10.58
Granted	—	—
Exercised	(396)	12.61
Forfeited or expired	(10)	13.49
Outstanding at December 31, 2024	1,625	$	10.07	3.45 years	$	25,380
Fully vested at December 31, 2024 and expected to vest thereafter	1,625	$	10.07	3.45 years	$	25,380
Exercisable at December 31, 2024	1,625	$	10.07	3.45 years	$	25,380

There was no unrecognized compensation expense from stock options as of December 31, 2024. The total intrinsic value of options exercised during fiscal years 2024, 2023, and 2022 was $7.9 million, $5.8 million, and $8.0 million, respectively.

Restricted stock units

From time to time, and pursuant to the 2021 Plan, we grant time-vested restricted stock units (“RSUs”) to our non-employee directors and certain employees and performance-vested restricted stock units (“PSUs”) to certain employees. RSUs granted prior to 2024 generally vest in four equal installments over a four-year period such that 100% of the RSUs will become vested on the fourth anniversary of the award, subject to the recipient’s continued employment with us on the applicable vesting dates. The general vesting period for RSUs granted since the start of 2024 decreased to three years. In some circumstances, we have granted RSUs subject to different vesting conditions, including RSUs that vest in a single installment or on a ratable schedule. Provided that the RSUs have not been forfeited earlier, they will generally vest upon the recipient’s retirement, death or disability, or upon a change in control of Amkor, in accordance with the terms and conditions of the applicable award agreement. The value of the RSUs is determined based on the fair market value of the underlying shares on the date of the grant, reduced by the present value of dividends or dividend equivalent rights expected to be paid on our common stock prior to vesting, and is recognized ratably over the vesting period.

PSUs granted prior to 2024 generally vest in one installment after a two-year period such that any earned PSUs will become vested within 90 days of the second anniversary of the award, subject to the recipient’s continued employment with us on the applicable vesting date. Generally for these PSUs, the number of shares of our common stock to be received at vesting will range from 0% to 200% of the target grant amount based on Cumulative Basic EPS (as defined in the applicable award agreement) over a two-year performance measurement period. In some circumstances, we have granted PSUs subject to different vesting conditions, including PSUs that vest in full upon the achievement of performance goals other than Cumulative Basic EPS.

In 2024, we granted PSUs that were divided between PSUs based on earnings per share in each of 2024, 2025 and 2026 (“EPS PSUs”), and PSUs based on relative total shareholder return (“rTSR PSUs”) as compared to the components of the PHLX Semiconductor Index (the “SOX”) over a three-year period, with half of the awards as EPS PSUs and half as rTSR PSUs. EPS PSUs will vest in three installments over a three-year period such that any earned PSUs will become vested within 90 days of each year ending 2024, 2025 and 2026, subject to the recipient’s continued employment with us on the applicable vesting dates. For EPS PSUs, the number of shares of our common stock to be received at vesting will range from 0% to 225% of the target grant amount. The rTSR PSUs will vest in one installment after a three-year period and the number of shares of our common stock to be received at vesting will range from 0% to 150% of the target grant amount based on rTSR performance over the three-year performance period.

Provided the PSUs have not been forfeited earlier, the PSUs will generally vest upon the recipient’s retirement, death or disability, or upon a change of control of Amkor, in accordance with the terms and conditions of the applicable award agreement. For the PSUs granted prior to 2024 and the EPS PSUs, the value is initially determined based on the fair market value of the underlying shares on the date of the grant, reduced by the present value of dividends expected to be

paid on our common stock prior to vesting. For the rTSR PSUs, we estimated the grant-date fair value using a Monte Carlo simulation model, using the following weighted-average assumptions: risk-free interest rate of 4.33% and annualized volatility of 46.77%. We recognize the grant date fair value of the PSUs as compensation expense ratably over the vesting period.

The following table summarizes our RSU and PSU activity:


	Number of Shares (In thousands)	Weighted- average Grant Date Fair Value (Per Share)
Non-vested at December 31, 2021	286	$	22.48
Awards granted	531	22.29
Awards vested	(22)	22.23
Awards forfeited	(57)	22.63
Non-vested at December 31, 2022	738	22.34
Awards granted	1,049	26.72
Awards vested	(464)	22.19
Awards forfeited	(16)	25.24
Non-vested at December 31, 2023	1,307	25.87
Awards granted	1,026	29.00
Awards vested	(489)	27.37
Awards forfeited	(217)	24.62
Non-vested at December 31, 2024	1,627	$	27.56

Total unrecognized compensation expense from RSUs and PSUs was $16.5 million as of December 31, 2024, which is expected to be recognized over a weighted-average period of approximately 1.78 years beginning January 1, 2025.

For the years ended December 31, 2024, 2023 and 2022 the total fair values of vested RSUs and PSUs were $15.5 million, $11.6 million and $0.5 million, respectively.

Dividends	12 Months Ended
Dividends	Dec. 31, 2024
Equity [Abstract]
Dividends	Dividends Our Board of Directors has adopted a dividend policy pursuant to which we currently pay a regular quarterly cash dividend on our common stock. In November 2024, our Board of Directors approved a quarterly dividend of $0.08269 per share, a 5% increase from the rate set in November 2023. The Board of Directors also approved a special cash dividend of $0.40546 per share, or approximately $100 million, on the company’s common stock.

- Definition

The entire disclosure for equity.

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+ Details

Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property, Plant and Equipment

Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:


Buildings and improvements			10 to 40 years
Machinery and equipment			2 to 7 years
Software and computer equipment			3 to 5 years
Furniture, fixtures and other equipment			4 to 10 years

Property, plant and equipment consist of the following:


	December 31,
	2024		2023
	(In thousands)
Land	$	246,953	$	212,722
Buildings and improvements	2,239,481		2,080,589
Machinery and equipment	7,389,787		7,022,614
Finance lease assets	274,302		209,506
Furniture, fixtures and other equipment	18,652		22,655
Software and computer equipment	215,031		200,362
Construction in progress	185,351		223,332
Total property, plant and equipment	10,569,557		9,971,780
Accumulated depreciation and amortization	(6,993,409)		(6,672,335)
Total property, plant and equipment, net	$	3,576,148	$	3,299,445

The following table summarizes our depreciation expense:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Depreciation expense	$	594,141	$	630,941	$	612,105

Business Segments, Customer Concentrations and Geographic Information (Schedule of Balances Included in Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Interest income	$ 65,541	$ 48,458	$ 12,762
Depreciation and amortization expense	(594,663)	(631,508)	(612,702)
Total assets	6,944,328	6,771,125	6,821,757
Capital expenditures	$ (743,796)	$ (749,467)	$ (908,294)

- Definition

Amount of asset recognized for present right to economic benefit.

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+ Details

Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Valuation Allowance [Line Items]
Total valuation allowance	$ 107,113	$ 114,811
United States
Valuation Allowance [Line Items]
Total valuation allowance	44,853	44,426
Foreign
Valuation Allowance [Line Items]
Total valuation allowance	$ 62,260	$ 70,385

Share-Based Compensation Plans (Narrative) (Details)		12 Months Ended
Share-Based Compensation Plans (Narrative) (Details)	Dec. 31, 2023 installment	Dec. 31, 2024 USD ($) installment shares	Dec. 31, 2023 USD ($) installment	Dec. 31, 2022 USD ($)	May 18, 2021 shares	Dec. 31, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation		$ 18,400,000	$ 8,300,000	$ 13,600,000
Deferred income tax benefits for stock options and restricted stock		2,400,000	700,000	1,700,000
Total intrinsic value		$ 7,900,000	$ 5,800,000	8,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period		10 years
Unrecognized compensation expense		$ 0
Time-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years	3 years
Award vesting installments \| installment	4		4
Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years	2 years
Award vesting installments \| installment	1	3	1
Period of earned awards become vested		90 days	90 days
Award performance measurement period			2 years
Relative Total Shareholder Return PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Award vesting installments \| installment		1
Award performance measurement period		3 years
Risk free interest rate		4.33%
Annualized average volatility rate		46.77%
Restricted Stock Units (RSUs) & Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 16,500,000
Weighted-average period		1 year 9 months 10 days
Total fair value of vested restricted shares		$ 15,500,000	$ 11,600,000	$ 500,000
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Minimum \| Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount	0.00%	0.00%	0.00%
Minimum \| Relative Total Shareholder Return PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount		0.00%
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Maximum \| Time-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares vesting (as a percent)	100.00%
Maximum \| Performance-Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount	200.00%	225.00%	200.00%
Maximum \| Relative Total Shareholder Return PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of target grant amount		150.00%
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares						17,000,000.0
Two Thousand Twenty-One Equity Incentive Plan Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares					23,100,000
Number of shares reserved for issuance (in shares) \| shares					22,800,000
Number of shares available for grant (in shares) \| shares		19,400,000

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Payroll and benefits	$ 121,683	$ 115,604
Deferred revenue and customer advances	59,656	71,117
Short-term finance lease liability	$ 55,613	$ 57,761
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total accrued expenses	Total accrued expenses
Income taxes payable	$ 35,067	$ 35,215
Accrued pension and severance obligations (Note 12)	13,091	7,906
Accrued interest	11,487	11,175
Other accrued expenses	59,740	59,636
Total accrued expenses	$ 356,337	$ 358,414

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,151,380	$ 1,198,094
Fair Value \| Senior notes (Level 1) \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	525,562	531,778
Fair Value \| Revolving credit facilities and term loans (Level 2) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	625,818	666,316
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,159,460	1,203,456
Carrying Value \| Senior notes (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	522,615	521,839
Carrying Value \| Revolving credit facilities and term loans (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 636,845	$ 681,617

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 355,535	$ 362,131	$ 767,042
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	594,663	631,508	612,702
Amortization of deferred debt issuance costs and premiums	3,534	3,523	3,247
Deferred income taxes	(784)	13,394	(11,623)
Gain on disposal of fixed assets, net	(3,978)	(2,200)	(2,807)
Share-based compensation	18,371	8,277	13,562
Other, net	8,160	16,660	(1,957)
Changes in assets and liabilities:
Accounts receivable	99,690	205,491	(103,990)
Inventories	78,965	233,797	(148,137)
Other current assets	(5,640)	2,673	(23,802)
Other assets	12,076	10,875	(34,835)
Trade accounts payable	(36,047)	(134,618)	86,574
Accrued expenses	3,709	(48,389)	(40,637)
Pension and severance obligations	(6,527)	(844)	(10,547)
Net operating lease ROU asset	3,544	50,650	(14,483)
Operating lease liabilities	(1,577)	(52,543)	1,574
Other non-current liabilities	(34,826)	(30,365)	6,873
Net cash provided by operating activities	1,088,868	1,270,020	1,098,756
Cash flows from investing activities:
Payments for property, plant and equipment	(743,796)	(749,467)	(908,294)
Proceeds from sale of property, plant and equipment	3,981	8,444	3,148
Proceeds from foreign exchange forward contracts	47,045	44,013	33,578
Payments for foreign exchange forward contracts	(88,623)	(75,786)	(104,703)
Payments for short-term investments	(568,711)	(657,583)	(438,803)
Proceeds from sale of short-term investments	65,502	94,242	33,972
Proceeds from maturities of short-term investments	474,097	379,344	370,924
Other investing activities	10,181	4,883	3,009
Net cash used in investing activities	(800,324)	(951,910)	(1,007,169)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	370,000	80,000
Payments of revolving credit facilities	0	(370,000)	(80,000)
Proceeds from short-term debt	5,012	20,712	29,711
Payments of short-term debt	(9,731)	(19,448)	(27,187)
Proceeds from long-term debt	172,651	168,335	366,386
Payments of long-term debt	(177,214)	(175,427)	(214,290)
Payments for debt issuance costs	(1,280)	(1,385)	(7,297)
Payments of finance lease obligations	(72,255)	(66,398)	(40,673)
Proceeds from issuance of stock through share-based compensation plans	4,995	3,562	5,635
Payments of dividends	(178,605)	(74,686)	(55,116)
Other financing activities	(4,005)	(4,472)	(1,572)
Net cash (used in) provided by financing activities	(260,432)	(149,207)	55,597
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(14,417)	(10,692)	(16,299)
Net increase in cash, cash equivalents and restricted cash	13,695	158,211	130,885
Cash, cash equivalents and restricted cash, beginning of period	1,120,617	962,406	831,521
Cash, cash equivalents and restricted cash, end of period	1,134,312	1,120,617	962,406
Cash paid during the period for:
Interest	60,263	54,306	54,355
Income taxes	82,617	90,458	97,333
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	118,082	104,109	142,160
Property, plant and equipment acquired through grants	32,670	0	0
Right of use assets acquired through operating lease liabilities	29,541	6,270	64,849
Right of use assets acquired through finance lease liabilities	149,865	58,232	58,166
Grants and incentive receivables for qualified capital expenditures	$ 1,403	$ 0	$ 0

Pension and Severance Plans (Schedule of Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,995,035	$ 3,699,701	$ 2,972,546
Amortization and settlement gain included in net periodic pension cost	(641)	(526)
Net gain (loss) arising during period	(8,199)	177
Total other comprehensive income (loss)	(8,840)	(349)	(3,279)
Balance at end of period	4,183,165	3,995,035	3,699,701
Prior Service Cost
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	602	602
Amortization and settlement gain included in net periodic pension cost	0	0
Net gain (loss) arising during period	0	0
Total other comprehensive income (loss)	0	0
Balance at end of period	602	602	602
Actuarial Net Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	15,303	13,618
Amortization and settlement gain included in net periodic pension cost	(388)	(46)
Net gain (loss) arising during period	1,053	1,731
Total other comprehensive income (loss)	665	1,685
Balance at end of period	15,968	15,303	13,618
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	15,905	14,220
Amortization and settlement gain included in net periodic pension cost	(388)	(46)
Net gain (loss) arising during period	1,053	1,731
Total other comprehensive income (loss)	665	1,685
Balance at end of period	$ 16,570	$ 15,905	$ 14,220

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

+ References

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Reference 49: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147476166/350-60-65-1

+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 355,535	$ 362,131	$ 767,042
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(722)	1,785	(1,225)
Adjustments to unrealized components of defined benefit pension plans	665	1,685	8,604
Foreign currency translation	(8,783)	(3,819)	(10,658)
Total other comprehensive income (loss)	(8,840)	(349)	(3,279)
Comprehensive income	346,695	361,782	763,763
Comprehensive income attributable to noncontrolling interests	(1,523)	(2,318)	(1,219)
Comprehensive income attributable to Amkor	$ 345,172	$ 359,464	$ 762,544

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:


Buildings and improvements			10 to 40 years
Machinery and equipment			2 to 7 years
Software and computer equipment			3 to 5 years
Furniture, fixtures and other equipment			4 to 10 years

Property, plant and equipment consist of the following:


	December 31,
	2024		2023
	(In thousands)
Land	$	246,953	$	212,722
Buildings and improvements	2,239,481		2,080,589
Machinery and equipment	7,389,787		7,022,614
Finance lease assets	274,302		209,506
Furniture, fixtures and other equipment	18,652		22,655
Software and computer equipment	215,031		200,362
Construction in progress	185,351		223,332
Total property, plant and equipment	10,569,557		9,971,780
Accumulated depreciation and amortization	(6,993,409)		(6,672,335)
Total property, plant and equipment, net	$	3,576,148	$	3,299,445

The following table summarizes our depreciation expense:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Depreciation expense	$	594,141	$	630,941	$	612,105

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table summarizes the computations of basic and diluted EPS:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands, except per share data)





Net income attributable to Amkor common stockholders	$	354,012	$	359,813	$	765,823

Weighted-average number of common shares outstanding — basic	246,344		245,628		244,676
Effect of dilutive securities:
Share-based awards	1,474		1,548		1,529
Weighted-average number of common shares outstanding — diluted	247,818		247,176		246,205
Net income attributable to Amkor per common share:
Basic	$	1.44	$	1.46	$	3.13
Diluted	$	1.43	$	1.46	$	3.11

Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share

The following table summarizes the potential shares of common stock that were excluded from diluted EPS, because the effect of including these potential shares was anti-dilutive:


	For the Year Ended December 31,
	2024	2023	2022
	(In thousands)
Share-based awards	—	2	180

Business Segments, Customer Concentrations and Geographic Information (Schedule of Net Sales by Country, and Property, Plant and Equipment by Physical Location) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 6,317,692	$ 6,503,065	$ 7,091,585
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Net sales	817,875	1,043,880	1,084,853
Japan
Segment Reporting Information [Line Items]
Net sales	800,713	935,620	1,132,121
Asia Pacific (excluding Japan)
Segment Reporting Information [Line Items]
Net sales	716,344	704,520	1,017,246
Total foreign countries
Segment Reporting Information [Line Items]
Net sales	2,334,932	2,684,020	3,234,220
United States
Segment Reporting Information [Line Items]
Net sales	$ 3,982,760	$ 3,819,045	$ 3,857,365

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 22
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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+ Details

Business Segments, Customer Concentrations and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Schedule of Segment Revenue, Segment Profit or Loss and Balances Included in Net Income

The following table presents revenue, profit or loss and significant segment expenses for our single operating segment:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Net sales	$	6,317,692	$	6,503,065	$	7,091,585
Less:
Materials cost of sales	3,478,752		3,584,090		3,646,188
Labor cost of sales	628,201		643,993		712,070
Depreciation cost of sales	534,921		576,120		565,455
Other cost of sales	742,606		755,709		837,885
Selling, general and administrative	331,806		295,393		283,372
Research and development	162,951		177,473		149,429
Interest expense	64,945		59,000		58,563
Income tax expense	75,481		81,710		89,890
Other segment items (1)	(57,506)		(32,554)		(18,309)
Segment net income	$	355,535	$	362,131	$	767,042

(1)Other segment items included in segment net income includes interest income, foreign currency (gain) loss, net, loss on debt retirement and other (income) expense.

The following table represents other balances included in net income or that are regularly provided to the CODM:


	December 31,
	2024		2023		2022
	(In thousands)
Interest income	$	65,541	$	48,458	$	12,762
Depreciation and amortization expense	(594,663)		(631,508)		(612,702)
Total assets	6,944,328		6,771,125		6,821,757
Capital expenditures	(743,796)		(749,467)		(908,294)

Schedule of Revenue from External Customers by Products and Services

Net sales by product group consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Advanced Products	$	5,174,459	$	5,032,859	$	5,367,589
Mainstream Products	1,143,233		1,470,206		1,723,996
Total net sales	$	6,317,692	$	6,503,065	$	7,091,585

(1)Advanced Products include flip chip, memory and wafer-level processing and related test services.

(2)Mainstream Products include all other wirebond packaging and related test services.

Net sales by end market consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
Communications (smartphones, tablets)	48	%	50	%	44	%
Computing (data center, infrastructure, PC/laptop, storage)	19	%	16	%	16	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	18	%	21	%	20	%
Consumer (AR & gaming, connected home, home electronics, wearables)	15	%	13	%	20	%
Total net sales	100	%	100	%	100	%

Schedule of Net Sales by Country, and Property, Plant and Equipment by Physical Location

Net sales by region based on customer headquarters location consist of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Europe, Middle East and Africa	$	817,875	$	1,043,880	$	1,084,853
Japan	800,713		935,620		1,132,121
Asia Pacific (excluding Japan)	716,344		704,520		1,017,246
Total foreign countries	2,334,932		2,684,020		3,234,220
United States	3,982,760		3,819,045		3,857,365
Total net sales	$	6,317,692	$	6,503,065	$	7,091,585

Schedule of Property, Plant and Equipment, Net, Based on Physical Location

Property, plant and equipment, net, based on physical location, consist of the following:


	December 31,
	2024		2023
	(In thousands)
China	$	308,889	$	385,544
Japan	139,126		143,399
Korea	1,923,953		1,781,632
Malaysia	55,166		51,164
Philippines	172,180		183,430
Portugal	130,653		108,982
Taiwan	322,539		272,428
Vietnam	471,581		365,059
Other foreign countries	1,553		272
Total foreign countries	3,525,640		3,291,910
United States	50,508		7,535
Total property, plant and equipment, net	$	3,576,148	$	3,299,445

Pension and Severance Plans (Schedule of Weighted-average Assumptions Used in Computing the Net Periodic Pension Cost and Projected Benefit Obligations) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Discount rate for determining net periodic pension cost (as a percent)	3.80%	4.20%	2.60%
Discount rate for determining benefit obligations at December 31 (as a percent)	3.80%	3.80%	4.20%
Rate of compensation increase for determining net periodic pension cost (as a percent)	3.70%	3.60%	3.70%
Rate of compensation increase for determining benefit obligations at December 31 (as a percent)	3.80%	3.70%	3.60%
Expected rate of return on plan assets for determining net periodic pension cost (as a percent)	4.50%	4.10%	3.80%

Other Income and Expense (Tables)

12 Months Ended

Dec. 31, 2024

Other Income and Expenses [Abstract]

Schedule of Other (Income) Expense

Other income and expense consists of the following:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Interest income	$	(65,541)	$	(48,458)	$	(12,762)
Foreign currency (gain) loss, net	8,856		18,361		(1,572)
Loss on debt retirement	—		—		464
Other	(821)		(2,457)		(4,439)
Total other (income) expense, net	$	(57,506)	$	(32,554)	$	(18,309)

Leases (Schedule of Maturities of Lease Liabilities) (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Operating Leases
2025	$ 30,852
2026	23,072
2027	16,258
2028	6,615
2029	4,803
Thereafter	16,884
Total future minimum lease payments	98,484
Less: Imputed interest	(13,674)
Total	84,810
Finance Leases
2025	65,666
2026	52,194
2027	32,624
2028	17,433
2029	23,836
Thereafter	12,618
Total future minimum lease payments	204,371
Less: Imputed interest	(26,050)
Total	$ 178,321

Pension and Severance Plans (Schedule of Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2025	$ 9,307
2026	11,145
2027	13,419
2028	14,037
2029	13,922
2030 to 2034	$ 97,256

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Schedule of Income Before Income Tax, Domestic and Foreign

Geographic sources of income (loss) before taxes are as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
United States	$	81,289	$	94,643	$	81,488
Foreign	349,727		349,198		775,444
Income before taxes	$	431,016	$	443,841	$	856,932

Schedule of Components of Income Tax Expense (Benefit)

The components of the provision (benefit) for income taxes are as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Current:
Federal	$	7,898	$	19,831	$	40,063
State	34		7		150
Foreign	68,333		48,478		61,300
	76,265		68,316		101,513
Deferred:
Federal	153		8,899		(10,156)
State	(501)		1		1,458
Foreign	(436)		4,494		(2,925)
	(784)		13,394		(11,623)
Income tax expense	$	75,481	$	81,710	$	89,890

Schedule of Reconciliation of Effective Tax Rate

The reconciliation between the U.S. federal statutory income tax rate of 21% and our effective tax rate is as follows:


	For the Year Ended December 31,
	2024		2023		2022
U.S. federal statutory income tax rate	21.0	%	21.0	%	21.0	%

Foreign income taxed at different rates	(2.1)		(4.2)		(12.0)
Foreign exchange (loss) gain	1.4		0.5		2.2

Change in valuation allowance	(1.8)		2.9		(2.4)

Income tax credits generated	(6.8)		(7.5)		(6.1)
Foreign earnings and profits	3.5		7.0		9.0
Foreign derived intangible income	(1.8)		(1.6)		(0.9)

Settlements and changes in uncertain tax positions	3.8		(0.5)		(0.2)
Other	0.3		0.8		(0.1)
Income tax expense	17.5	%	18.4	%	10.5	%

Schedule of Components of Deferred Tax Assets and Liabilities

The following is a summary of the components of our deferred tax assets and liabilities:


	December 31,
	2024		2023
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	21,420	$	33,679

Tax credit carryforwards	69,373		88,147
Property, plant and equipment	18,512		21,387
Deferred interest expense	446		476
Accrued liabilities	37,968		37,832
Receivable	27,284		30,086
Unrealized foreign exchange loss	23,769		7,205
Operating lease liabilities	14,825		16,053
Other	14,203		15,219
Total deferred tax assets	227,800		250,084
Valuation allowance	(107,113)		(114,811)
Total deferred tax assets net of valuation allowance	120,687		135,273
Deferred tax liabilities:
Property, plant and equipment	27,442		34,206
Deferred gain	3,341		5,739
Unrealized foreign exchange gain	6,674		3,129
Unbilled receivables	6,508		8,995
Operating lease right of use assets	14,240		16,031
Other	6,560		5,533
Total deferred tax liabilities	64,765		73,633
Net deferred tax assets	$	55,922	$	61,640
Recognized as:
Other assets	$	72,488	$	73,585
Other non-current liabilities	(16,566)		(11,945)
Total	$	55,922	$	61,640

Schedule of Valuation Allowance

Valuation allowance against deferred tax assets consist of the following:


	December 31,
	2024		2023
	(In thousands)
Valuation allowance:
U.S.	$	44,853	$	44,426
Foreign	62,260		70,385
Total valuation allowance	$	107,113	$	114,811

Schedule of Net Operating Loss Carryforwards

Our net operating loss carryforwards are as follows:


	December 31,
	2024		2023		Expiration
	(In thousands)
U.S. federal net operating loss carryforwards	$	—	$	5,611	2024
U.S. state net operating loss carryforwards	27,334		32,612		2025-2036
Foreign net operating loss carryforwards	207,203		196,636		2025-2031

Schedule of Tax Credit Carryforwards

Our tax credit carryforwards are as follows:


	December 31,
	2024		2023		Expiration
	(In thousands)
U.S. Foreign Tax Credits	$	49,639	$	51,512	2027-2034
U.S. Other Tax Credits	3,817		2,559		2026-2034
Foreign Tax Credits	19,543		34,546		2025-2034

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending gross amount of unrecognized tax benefits is as follows:


	For the Year Ended December 31,
	2024		2023		2022
	(In thousands)
Balance at January 1	$	31,537	$	33,253	$	37,293
Additions based on tax positions related to the current year	7,260		—		1,519
Additions for tax positions of prior years	3,761		495		1,909
Reductions for tax positions of prior years	(4,992)		(345)		(5,755)
Reductions related to settlements with tax authorities	(789)		—		(988)
Reductions from lapse of statutes of limitations	(461)		(1,866)		(725)
Balance at December 31	$	36,316	$	31,537	$	33,253

Share-Based Compensation Plans (Schedule of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) $ / shares shares
Number of Shares
Outstanding beginning balance (in shares) \| shares	2,031
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	(396)
Forfeited or expired (in shares) \| shares	(10)
Outstanding ending balance (in shares) \| shares	1,625
Fully vested and expected to vest (in shares) \| shares	1,625
Exercisable (in shares) \| shares	1,625
Weighted-Average Exercise Price per Share
Outstanding beginning balance (in dollars per share) \| $ / shares	$ 10.58
Granted (in dollars per share) \| $ / shares	0
Exercised (in dollars per share) \| $ / shares	12.61
Forfeited or expired (in dollars per share) \| $ / shares	13.49
Outstanding ending balance (in dollars per share) \| $ / shares	10.07
Fully vested and expected to vest (in dollars per share) \| $ / shares	10.07
Exercisable (in dollars per share) \| $ / shares	$ 10.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding (years)	3 years 5 months 12 days
Fully vested and expected to vest (years)	3 years 5 months 12 days
Exercisable (years)	3 years 5 months 12 days
Outstanding ending balance \| $	$ 25,380
Fully vested and expected to vest \| $	25,380
Exercisable \| $	$ 25,380