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•	We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

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•	We do not adjust the promised amount of consideration for the effects of a significant financing component when we expect, at contract inception, that the period between when the entity transfers a promised good or service to a customer and when the customer pays for that good or service will be one year or less.

•	We exclude sales, use, value-added and similar taxes from the transaction price, without performing a jurisdiction-by-jurisdiction assessment.

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(1)	The adjustment to accumulated deficit includes the 2017 and 2016 net income impact for the adoption of Topic 606 of $2.8 million and $11.3 million, respectively. The adjustment also includes the cumulative impact to our 2016 beginning accumulated deficit of $14.8 million.

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–	A contract with a customer has been identified

–	All performance obligations within the customer contract have been identified

–	The transaction price attributable to the contract has been determined and allocated to each performance obligation, and

–	The performance obligations have been determined to be satisfied. Performance obligations are deemed to be satisfied when, or as, control of services has been transferred to the customer.

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(1)	Advanced products include flip chip and wafer-level processing and related test services

(2)	Mainstream products include wirebond packaging and related test services

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(1)

As of June 30, 2018, we had availability of $199.5 million under a senior secured revolving credit facility, after reduction of $0.5 million of outstanding standby letters of credit. In July 2018, this credit facility was terminated and replaced by a new facility entered into by Amkor Technology Singapore Holding Pte, Ltd. and guaranteed by Amkor Technology, Inc. This new credit facility has availability up to $250.0 million, a letter of credit sub-limit facility of $15.0 million and a termination date of July 2023. The availability for this revolving credit facility is limited to a percentage of the amount of eligible accounts receivable.

(2)

In July 2018, we issued a redemption notice for all $200 million of our 6.625% Senior Notes due 2021 ("Notes"). The note redemption is scheduled for completion in August 2018. In accordance with the terms of the indenture governing the Notes, the redemption price will be 100% of the principal amount of the Notes plus accrued and unpaid interest. The redemption of the Notes will be funded with proceeds from our ¥26.0 billion (approximately US$230 million) term loan agreement entered into in July 2018 by J-Devices Corporation and guaranteed by Amkor

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(3)	In June 2018, we extended our $75.0 million credit facility from June 2018 to September 2018. Principal is payable at maturity. Interest is due monthly in arrears, at a foreign currency funding-linked base rate plus 1.60% (4.66% as of June 30, 2018).

(4)

In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million for capital expenditures. Principal is payable at maturity. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% (4.27% as of June 30, 2018). In the second quarter of 2018, we borrowed $64.0 million on this facility and repaid other Amkor Technology Korea, Inc. term loans with earlier maturity dates.

(5)	We entered into various short-term term loans which mature semiannually. Principal and interest is payable in monthly installments. Interest as of June 30, 2018 is at TIBOR plus 0.15%. As of June 30, 2018, $9.0 million was available to be drawn.

(6)	In November 2015, we entered into a $39.0 million revolving credit facility. Principal is payable at maturity. Interest is payable monthly, at TAIFX plus a bank determined spread (3.75% as of June 30, 2018). As of June 30, 2018, $19.0 million was available to be drawn.

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(1)	Represents interest payment obligations calculated using stated coupon rates for fixed rate debt and interest rates applicable at June 30, 2018, for variable rate debt.

(2)	Represents off-balance sheet purchase obligations for capital expenditures and long-term supply contracts outstanding at June 30, 2018.

(3)	Represents estimated benefit payments for our Korean subsidiary severance plan.

(4)	Represents settlement payments for patent license litigation. At June 30, 2018, the total obligation is $19.4 million of which $19.2 million is a current liability and $0.2 million will be imputed into interest over time.

•	$53.5 million of net foreign pension plan obligations, for which the timing and actual amount of impact on our future cash flow is uncertain.

•	$29.3 million net liability associated with unrecognized tax benefits. Due to the uncertainty regarding the amount and the timing of any future cash outflows associated with our unrecognized tax benefits, we are unable to reasonably estimate the amount and period of ultimate settlement, if any, with the various taxing authorities.

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•	fluctuation in demand for semiconductors and conditions in the semiconductor industry generally, as well as by specific customers, such as inventory reductions by our customers impacting demand in key markets;

•	our ability to achieve our major growth objectives, including: transitioning second-wave customers to advanced packages; expanding our sales to customers in Greater China and, in particular, in the mid-level and entry-level tiers of the mobile device market; and increasing our share of the automotive market;

•	changes in our capacity and capacity utilization rates;

•	changes in average selling prices which can occur quickly due to the absence of long-term agreements on price;

•	changes in the mix of the semiconductor packaging and test services that we sell;

•	the development, transition and ramp to high volume manufacture of more advanced silicon nodes and evolving wafer, packaging and test technologies, may cause production delays, lower manufacturing yields and supply constraints for new wafers and other materials;

•	absence of backlog, the short-term nature of our customers’ commitments, double bookings by customers and deterioration in customer forecasts and the impact of these factors, including the possible delay, rescheduling and cancellation of large orders, or the timing and volume of orders relative to our production capacity;

•	changes in costs, quality, availability and delivery times of raw materials, components and equipment;

•	changes in labor costs to perform our services;

•	wage inflation and fluctuations in commodity prices, including gold, copper and other precious metals;

•	the timing of expenditures in anticipation of future orders;

•	changes in effective tax rates;

•	the availability and cost of financing;

•	intellectual property transactions and disputes;

•	high leverage and restrictive covenants;

•	warranty and product liability claims and the impact of quality excursions and customer disputes and returns;

•	costs associated with legal claims, indemnification obligations, judgments and settlements;

•	international events, such as the United Kingdom's vote to leave the European Union, political instability, civil disturbances or environmental or natural events, such as earthquakes like the recent ones in Japan, that impact our operations;

•	pandemic illnesses that may impact our labor force and our ability to travel;

•	costs of acquisitions and divestitures and difficulties integrating acquisitions;

•	our ability to attract and retain qualified personnel to support our global operations;

•	fluctuations in interest rates and currency exchange rates;

•	fluctuations in our manufacturing yields;

•	our ability to penetrate new end markets or expand our business in existing end markets;

•	dependence on key customers or concentration of customers in certain end markets, such as mobile communications and automotive and

•	restructuring charges, asset write-offs and impairments.

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•	changes in consumer demand resulting from deteriorating conditions in local economies;

•

laws, rules, regulations and policies imposed by U.S. or foreign governments, such as tariffs, customs, duties and other restrictive trade barriers, national security, data privacy and cybersecurity, antitrust and competition, tax, currency and banking, labor, environmental, health and safety, and in particular the recent increase in tariffs, customs, duties and other restrictive trade barriers considered or adopted by U.S. and foreign governments;

•	laws, rules, regulations and policies within China and other countries that may favor domestic companies over non-domestic companies, including customer- or government-supported efforts to promote the development and growth of local competitors;

•	the payment of dividends and other payments by non-U.S. subsidiaries may be subject to prohibitions, limitations or taxes in local jurisdictions;

•	fluctuations in currency exchange rates, particularly the dollar/yen exchange rate for J-Devices;

•	political and social conditions, and the potential for civil unrest, terrorism or other hostilities;

•	disruptions or delays in shipments caused by customs brokers or government agencies;

•	difficulties in attracting and retaining qualified personnel and managing foreign operations, including foreign labor disruptions;

•	difficulty in enforcing contractual rights and protecting our intellectual property rights;

•	potentially adverse tax consequences resulting from tax laws in the U.S. and in foreign jurisdictions in which we operate and

•	local business and cultural factors that differ from our normal standards and practices, including business practices that we are prohibited from engaging in by the Foreign Corrupt Practices Act and other anti-corruption laws and regulations.

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•	their desire to realize higher utilization of their existing packaging and test capacity, especially during downturns in the semiconductor industry;

•	their unwillingness to disclose proprietary technology;

•	their possession of more advanced packaging and test technologies and

•	the guaranteed availability of their own packaging and test capacity.

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•	make it more difficult for us to satisfy our obligations with respect to our indebtedness, including our obligations under our indentures to purchase notes tendered as a result of a change in control of Amkor;

•	increase our vulnerability to general adverse economic and industry conditions;

•	limit our ability to fund future working capital, capital expenditures, research and development and other business opportunities, including joint ventures and acquisitions;

•	require us to dedicate a substantial portion of our cash flow from operations to service payments of interest and principal on our debt, thereby reducing the availability of our cash flow to fund future working capital, capital expenditures, research and development expenditures and other general corporate requirements;

•	increase the volatility of the price of our common stock;

•	limit our flexibility to react to changes in our business and the industry in which we operate;

•	place us at a competitive disadvantage to any of our competitors that have less debt;

•	limit, along with the financial and other restrictive covenants in our indebtedness, among other things, our ability to borrow additional funds;

•	limit our ability to refinance our existing indebtedness, particularly during periods of adverse credit market conditions when refinancing indebtedness may not be available under interest rates and other terms acceptable to us or at all and

•	increase our cost of borrowing.

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•	we may face delays in the design and implementation of the system;

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•	the cost of the systems may exceed our plans and expectations and

•	disruptions resulting from the implementation or integration of the systems may impact our ability to process transactions and delay shipments to customers, impact our results of operations or financial condition or harm our control environment.

•	increasing the scope, geographic diversity and complexity of our operations;

•	conforming an acquired company's standards, practices, systems and controls with our operations;

•	increasing complexity from combining recent acquisitions of an acquired business;

•	unexpected losses of key employees or customers of an acquired business; other difficulties in the assimilation of acquired operations, technologies or products and

•	diversion of management and other resources from other parts of our operations and adverse effects on existing business relationships with customers.

•	use a significant portion of our available cash;

•	issue equity securities, which may dilute the ownership of current stockholders;

•	incur substantial debt;

•	incur or assume known or unknown contingent liabilities and

•	incur large, immediate accounting write offs and face antitrust or other regulatory inquiries or actions.

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•	our future financial condition, results of operations and cash flows;

•	general market conditions for financing;

•	volatility in fixed income, credit and equity markets and

•	economic, political and other global conditions.

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•	discontinue the use of certain processes or cease to provide the services at issue, which could curtail our business;

•	pay substantial damages;

•	develop non-infringing technologies, which may not be feasible or

•	acquire licenses to such technology, which may not be available on commercially reasonable terms or at all.

•	contaminants in the manufacturing environment;

•	human error;

•	equipment malfunction;

•	changing processes to address environmental requirements;

•	defective raw materials or

•	defective plating services.

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(a)	Represents shares of common stock surrendered to us to satisfy tax withholding obligations associated with the vesting of restricted shares issued to employees.

(b)

Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, $150.0 million in August 2011 and $150.0 million in February 2012, exclusive of any fees, commissions or other expenses. For the three months ended June 30, 2018, we made no common stock purchases, and at June 30, 2018, approximately $91.6 million was available pursuant to the stock repurchase program.

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1.	I have reviewed this Quarterly Report on Form 10-Q of Amkor Technology, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

1.	I have reviewed this Quarterly Report on Form 10-Q of Amkor Technology, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.