amkr-20240331

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)


	For the Three Months Ended March 31,
	2024		2023
	(In thousands, except per share data)
Net sales	$	1,365,511	$	1,471,539
Cost of sales	1,163,868		1,277,118
Gross profit	201,643		194,421
Selling, general and administrative	90,346		78,671
Research and development	38,171		47,047

Total operating expenses	128,517		125,718
Operating income	73,126		68,703
Interest expense	16,439		16,167

Other (income) expense, net	(15,295)		(3,552)
Total other expense, net	1,144		12,615
Income before taxes	71,982		56,088
Income tax expense	12,196		10,864
Net income	59,786		45,224
Net (income) loss attributable to non-controlling interests	(889)		127
Net income attributable to Amkor	$	58,897	$	45,351

Net income attributable to Amkor per common share:
Basic	$	0.24	$	0.18
Diluted	$	0.24	$	0.18

Shares used in computing per common share amounts:
Basic	246,008		245,330
Diluted	247,614		247,087

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Net income	$	59,786	$	45,224
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(308)		601
Adjustments to unrealized components of defined benefit pension plans	(85)		(97)
Foreign currency translation	(9,047)		(2,113)

Total other comprehensive income (loss)	(9,440)		(1,609)
Comprehensive income	50,346		43,615
Comprehensive (income) loss attributable to non-controlling interests	(889)		127
Comprehensive income attributable to Amkor	$	49,457	$	43,742

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited)


	March 31, 2024		December 31, 2023
	(In thousands, except per share data)
ASSETS
Current assets:
Cash and cash equivalents	$	1,118,004	$	1,119,818

Short-term investments (amortized cost of $454,767 and $474,663 in 2024 and 2023, respectively)	454,669		474,869
Accounts receivable, net of allowances	1,093,960		1,149,493
Inventories	331,070		393,128
Other current assets	47,312		58,502
Total current assets	3,045,015		3,195,810
Property, plant and equipment, net	3,367,434		3,299,445
Operating lease right of use assets	106,873		117,006
Goodwill	18,641		20,003
Restricted cash	781		799
Other assets	146,322		138,062
Total assets	$	6,685,066	$	6,771,125
LIABILITIES AND EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	112,968	$	131,624
Trade accounts payable	618,378		754,453
Capital expenditures payable	234,762		106,368
Short-term operating lease liability	27,112		33,616
Accrued expenses	309,976		358,414
Total current liabilities	1,303,196		1,384,475
Long-term debt	1,038,346		1,071,832
Pension and severance obligations	79,647		87,133
Long-term operating lease liabilities	52,924		56,837
Other non-current liabilities	180,345		175,813
Total liabilities	2,654,458		2,776,090
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	—		—
Common stock, $0.001 par value, 500,000 shares authorized; 292,494 and 292,167 shares issued; and 246,154 and 245,888 shares outstanding in 2024 and 2023, respectively	292		292
Additional paid-in capital	2,014,782		2,008,170
Retained earnings	2,199,300		2,159,831
Accumulated other comprehensive income (loss)	6,910		16,350
Treasury stock, at cost, 46,340 and 46,279 shares in 2024 and 2023, respectively	(224,157)		(222,335)
Total Amkor stockholders’ equity	3,997,127		3,962,308
Non-controlling interests in subsidiaries	33,481		32,727
Total equity	4,030,608		3,995,035
Total liabilities and equity	$	6,685,066	$	6,771,125

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)


				Additional Paid- In Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)					Total Amkor Stockholders’ Equity		Noncontrolling Interest in Subsidiaries		Total Equity
	Common Stock									Treasury Stock
	Shares	Par Value								Shares	Cost
	(In thousands)












Balance at December 31, 2023	292,167	$	292	$	2,008,170	$	2,159,831	$	16,350	(46,279)	$	(222,335)	$	3,962,308	$	32,727	$	3,995,035
Net income	—	—		—		58,897		—		—	—		58,897		889		59,786
Other comprehensive income (loss)	—	—		—		—		(9,440)		—	—		(9,440)		—		(9,440)


Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—		—		(61)	(1,822)		(1,822)		—		(1,822)
Issuance of stock through share-based compensation plans	327	—		1,356		—		—		—	—		1,356		—		1,356
Share-based compensation	—	—		5,256		—		—		—	—		5,256		—		5,256
Cash dividends declared ($0.07875 per common share)	—	—		—		(19,428)		—		—	—		(19,428)		—		(19,428)
Subsidiary dividends to non-controlling interests	—	—		—		—		—		—	—		—		(135)		(135)
Balance at March 31, 2024	292,494	$	292	$	2,014,782	$	2,199,300	$	6,910	(46,340)	$	(224,157)	$	3,997,127	$	33,481	$	4,030,608


















Balance at December 31, 2022	291,249	$	291	$	1,996,344	$	1,874,644	$	16,699	(46,158)	$	(219,226)	$	3,668,752	$	30,949	$	3,699,701
Net income	—	—		—		45,351		—		—	—		45,351		(127)		45,224
Other comprehensive income (loss)	—	—		—		—		(1,609)		—	—		(1,609)		—		(1,609)


Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—		—		(111)	(2,823)		(2,823)		—		(2,823)
Issuance of stock through share-based compensation plans	565	1		1,523		—		—		—	—		1,524		—		1,524
Share-based compensation	—	—		3,708		—		—		—	—		3,708		—		3,708
Cash Dividends declared ($0.075 per common share)	—	—		—		(18,426)		—		—	—		(18,426)		—		(18,426)
Subsidiary dividends to non-controlling interests	—	—		—		—		—		—	—		—		(136)		(136)
Balance at March 31, 2023	291,814	$	292	$	2,001,575	$	1,901,569	$	15,090	(46,269)	$	(222,049)	$	3,696,477	$	30,686	$	3,727,163

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Cash flows from operating activities:
Net income	$	59,786	$	45,224
Depreciation and amortization	144,925		156,762


Other operating activities and non-cash items	14,100		(2,821)
Changes in assets and liabilities	(56,499)		(23,419)
Net cash provided by operating activities	162,312		175,746
Cash flows from investing activities:
Payments for property, plant and equipment	(96,169)		(98,224)
Proceeds from sale of property, plant and equipment	3,439		652

Proceeds from foreign exchange forward contracts	740		20,267
Payments for foreign exchange forward contracts	(24,596)		(20,358)
Payments for short-term investments	(111,760)		(172,409)
Proceeds from sale of short-term investments	16,014		21,549
Proceeds from maturities of short-term investments	121,684		92,655
Other investing activities	4,545		164
Net cash used in investing activities	(86,103)		(155,704)
Cash flows from financing activities:
Proceeds from revolving credit facilities	—		370,000
Payments of revolving credit facilities	—		(370,000)
Proceeds from short-term debt	5,012		11,042
Payments of short-term debt	(5,669)		(5,840)


Payments of long-term debt	(29,100)		(35,980)




Payments of finance lease obligations	(19,684)		(15,148)



Payments of dividends	(19,383)		(18,430)
Other financing activities	(1,053)		(1,850)
Net cash used in financing activities	(69,877)		(66,206)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(8,164)		(2,943)
Net decrease in cash, cash equivalents and restricted cash	(1,832)		(49,107)
Cash, cash equivalents and restricted cash, beginning of period	1,120,617		962,406
Cash, cash equivalents and restricted cash, end of period	$	1,118,785	$	913,299
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	$	195,405	$	177,615

Right of use assets acquired through finance lease liabilities	17,811		17,513
Right of use assets acquired through operating lease liabilities	2,321		3,180

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Interim Financial Statements

Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2024, and for the three months ended March 31, 2024 and 2023, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2023 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2023 Form 10-K. The results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full year ending December 31, 2024. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries.

Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment.

Leases. Total long-term finance lease liabilities as of March 31, 2024 and December 31, 2023 were $49.7 million and $47.8 million, respectively.

Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.

Unbilled Receivables. Total unbilled receivables as of March 31, 2024 and December 31, 2023 were $229.8 million and $260.8 million, respectively.

Contract Liabilities. Contract liabilities were $123.6 million and $135.5 million as of March 31, 2024 and December 31, 2023, respectively. As of March 31, 2024 and December 31, 2023, the short-term portions of the liabilities were $67.4 million and $71.1 million, respectively. The remainder of the March 31, 2024 contract liability balance is expected to be recognized in revenue over the next 1-5 years. Revenue recognized during the three months ended March 31, 2024 and 2023 that was included in the contract liabilities balance at the beginning of the period was $18.9 million and $21.5 million, respectively.

Share-based compensation. In February 2024, long-term incentive awards were granted in the form of time-vested restricted stock units (“RSUs”) and performance-vested restricted stock units (“PSUs”) to our management pursuant to the 2021 Equity Plan with different terms from those issued in prior years. For a description of the RSUs and PSUs granted in prior years, please refer to our Consolidated Financial Statements in Part II, Item 8, Note 2 of the 2023 Form 10-K.

The RSUs granted in the first quarter of 2024 will generally vest in three equal installments on the anniversary of the grant date, subject to the recipient’s continued employment with the Company at the time of vesting. 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.

The PSUs granted in the first quarter of 2024 are 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”), 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.

For the EPS PSUs, the value 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. The number of shares of our common stock to be received annually at vesting will range from 0% to

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

225%. For the rTSR PSUs, the Company estimated the grant-date fair value of the PSUs subject to a market condition 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%. The grant date fair value of the PSUs was $27.07. 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. The Company recognizes the grant date fair value of the PSUs as compensation expense ratably over the vesting period.

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. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.

2. Net Sales by Product Group and End Market

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Advanced products (1)	$	1,069,709	$	1,067,377
Mainstream products (2)	295,802		404,162
Total net sales	$	1,365,511	$	1,471,539

(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 Three Months Ended March 31,
	2024		2023
Communications (smartphones, tablets)	47	%	45	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	22	%	26	%
Computing (data center, infrastructure, PC/laptop, storage)	17	%	17	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	12	%
Total net sales	100	%	100	%

3. Other Income and Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Interest income	$	(16,796)	$	(10,433)
Foreign currency loss (gain), net	1,545		6,763



Other, net	(44)		118
Total other (income) expense, net	$	(15,295)	$	(3,552)

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

4. Income Taxes

Income tax expense of $12.2 million for the three months ended March 31, 2024 reflects income taxes, foreign withholding taxes and minimum taxes.

We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized.

Unrecognized tax benefits represent reserves for potential tax deficiencies or reductions in tax benefits that could result from federal, state or foreign tax audits. Gross unrecognized tax benefits decreased from $31.5 million as of December 31, 2023 to $30.6 million as of March 31, 2024. All of our unrecognized tax benefits would reduce our effective tax rate if recognized. Our unrecognized tax benefits are subject to change for effective settlement of examinations, changes in the recognition threshold of tax positions, the expiration of statutes of limitations and other factors.

We have tax returns that are open to examination in various jurisdictions for tax years 2013-2023. 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 the examinations will be favorable. 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.

5. 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, performance-vested restricted stock units, time-vested restricted stock units and unvested restricted shares.

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


	For the Three Months Ended March 31,
	2024		2023
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	58,897	$	45,351




Weighted-average number of common shares outstanding - basic	246,008		245,330
Effect of dilutive securities:
Share-based awards	1,606		1,757
Weighted-average number of common shares outstanding - diluted	247,614		247,087
Net income attributable to Amkor per common share:
Basic	$	0.24	$	0.18
Diluted	0.24		0.18

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

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 Three Months Ended March 31,
	2024	2023
	(In thousands)
Share-based awards	11	—

6. Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2023	$	212	$	15,905	$	233	$	16,350
Other comprehensive income (loss) before reclassifications	(253)		—		(9,047)		(9,300)
Amounts reclassified from accumulated other comprehensive income (loss)	(55)		(85)		—		(140)
Other comprehensive income (loss)	(308)		(85)		(9,047)		(9,440)
Accumulated other comprehensive income (loss) at March 31, 2024	$	(96)	$	15,820	$	(8,814)	$	6,910


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2022	$	(1,573)	$	14,220	$	4,052	$	16,699
Other comprehensive income (loss) before reclassifications	645		—		(2,113)		(1,468)
Amounts reclassified from accumulated other comprehensive income (loss)	(44)		(97)		—		(141)
Other comprehensive income (loss)	601		(97)		(2,113)		(1,609)
Accumulated other comprehensive income (loss) at March 31, 2023	$	(972)	$	14,123	$	1,939	$	15,090

(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).

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

7. Investments

All of our available-for-sale debt investments as of March 31, 2024 are available to fund current operations and are recorded at fair value (Note 14).

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


	March 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	$	51,970	$	—	$	—	$	51,970	$	—	$	51,970
Corporate bonds	1,657		—		—		1,657		—		1,657

Money market funds	97,440		—		—		97,440		97,440		—



U.S. government bonds	16,936		—		—		16,936		16,936		—

Total cash equivalents (2)	168,003		—		—		168,003		114,376		53,627

Short-term investments
Asset-backed securities	62,076		99		(27)		62,148		—		62,148
Certificate of deposits	19,294		—		—		19,294		19,294		—
Commercial paper	45,383		—		—		45,383		—		45,383
Corporate bonds	255,876		277		(301)		255,852		—		255,852



U.S. government agency bonds	4,729		—		(4)		4,725		—		4,725
U.S. government bonds	62,212		—		(142)		62,070		62,070		—

Total short-term investments	449,570		376		(474)		449,472		81,364		368,108
Total	$	617,573	$	376	$	(474)	$	617,475	$	195,740	$	421,735

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)


	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		—



U.S. government bonds	2,996		—		—		2,996		2,996		—
Total cash equivalents	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 it is not more likely than not that we will be required to sell these investments before recovery of their amortized cost bases.

(2)For three months ended March 31, 2024 and 2023, we sold cash equivalent investments for proceeds of $5.8 million and $13.0 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 March 31, 2024:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	459,067	$	458,887
After 1 year through 5 years	96,430		96,440


Asset-backed securities	62,076		62,148
Total	$	617,573	$	617,475

Actual maturities can differ from contractual maturities due to various factors including the issuers may have the right to call or prepay obligations without call or prepayment penalties.

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

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

8. Factoring of Accounts Receivable

For 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 three months ended March 31, 2024 and 2023, we sold receivables totaling $24.4 million and $78.0 million, respectively, net of discounts and fees. Discounts and fees were insignificant for the three months ended March 31, 2024, and $0.2 million for the three months ended March 31, 2023.

9. Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Land	$	211,211	$	212,722
Buildings and improvements	2,149,095		2,080,589
Machinery and equipment	7,104,414		7,022,614
Finance lease assets	224,983		209,506
Furniture, fixtures and other equipment	22,460		22,655
Software and computer equipment	206,633		200,362
Construction in progress	198,263		223,332
Total property, plant and equipment	10,117,059		9,971,780
Accumulated depreciation and amortization	(6,749,625)		(6,672,335)
Total property, plant and equipment, net	$	3,367,434	$	3,299,445

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Depreciation expense	$	144,787	$	156,614

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. As a result, the reduction in depreciation expense of approximately $15 million benefited net income and diluted earnings per share by approximately $13 million and $0.05 for the first quarter of 2024, respectively.

-14-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

10. Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Payroll and benefits	$	95,100	$	115,604

Deferred revenue and customer advances	67,439		71,117
Short-term finance lease liabilities	52,734		57,761
Income taxes payable	30,471		35,215
Accrued severance plan obligations	7,518		7,906
Accrued interest	2,318		11,175
Other accrued expenses	54,396		59,636
Total accrued expenses	$	309,976	$	358,414

-15-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

11. Debt

Following is a summary of short-term borrowings and long-term debt:


	March 31, 2024		December 31, 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 1.85%, due April 2024 (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)	4,136		5,098
Term loan, fixed rate at 1.35%, due December 2024	28,246		40,414
Term loan, fixed rate at 1.20%, due December 2025	25,206		30,913
Term loan, fixed rate at 1.23%, due December 2026	47,605		55,729
Term loan, fixed rate at 1.59%, due December 2027	77,800		89,053
Term loan, fixed rate at 1.80%, due December 2028	109,845		124,078
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due June 2025	37,000		37,000
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due 2025	57,000		57,500
Term loans, SOFR plus 0.95%, due December 2026 (3)	45,000		45,000
Other:
Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (4)	—		—
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)	—		—
	1,156,838		1,209,785
Less: Unamortized discount and deferred debt costs, net	(5,524)		(6,329)
Less: Short-term borrowings and current portion of long-term debt	(112,968)		(131,624)
Long-term debt	$	1,038,346	$	1,071,832

(1)In April 2021, we entered into a ₩80.0 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 1.85%. As of March 31, 2024, ₩80.0 billion, or approximately $59 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. Interest as of March 31, 2024 is at an annual base rate equal to the Tokyo Interbank Offered Rate plus 0.18% to 0.20% (weighted average of 0.25% as of March 31, 2024). As of March 31, 2024, $2.9 million was available to be drawn.

-16-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

(3)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% (weighted average of 6.27% as of March 31, 2024). This contractual amendment is treated as a modification with no recognized gain or loss.

(4)In March 2022, Amkor Technology Taiwan Ltd. (“ATT”) amended an existing revolving credit facility to reduce availability from $36.0 million to $15.0 million. As of March 31, 2024, $15.0 million was available for future borrowings under such credit facility.

(5)In March 2022, Amkor Technology Singapore Holdings Pte. Ltd. (“ATSH”) entered into a $600.0 million senior secured revolving credit facility (the “2022 Singapore Revolver”), which is guaranteed by Amkor Technology, Inc., ATT and Amkor Advanced Technology, Inc. (“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 March 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 March 31, 2024, the collateralized debt balance was $627.7 million, of which $319.0 million of assets were pledged as collateral.

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 March 31, 2024.

12. Pension Plans

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Korea, Malaysia, the Philippines and Taiwan sponsor defined benefit pension plans. Charges to expense are based upon actuarial analyses. The components of net periodic pension cost for these defined benefit pension plans are as follows:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Service cost	$	3,484	$	3,828
Interest cost	1,459		1,603
Expected return on plan assets	(1,418)		(1,311)

Recognized actuarial gain	(97)		(98)
Net periodic pension cost	$	3,428	$	4,022

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.

-17-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

Defined Contribution Pension Plans

We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Defined contribution expense	$	8,414	$	8,796

13. Derivatives

We use foreign currency forward contracts to mitigate foreign currency risk of certain monetary assets and 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 March 31, 2024 and December 31, 2023, our foreign exchange forward contracts consisted of the following:


	March 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)
Japanese yen	$	235,397	$	457	Other current assets	$	279,027	$	2,745	Other current assets
Korean won	76,415		(11)		Accrued expenses	59,036		(97)		Accrued expenses
Philippine peso	9,009		(12)		Accrued expenses	6,553		(20)		Accrued expenses
Singapore dollar	14,741		(50)		Accrued expenses	11,506		20		Other current assets
Taiwan dollar	38,850		28		Other current assets	37,914		89		Other current assets
Total forward contracts	$	374,412	$	412		$	394,036	$	2,737

For the three months ended March 31, 2024 and 2023, the derivatives resulted in a net loss of $27.5 million and $12.0 million, which were partially offset by the foreign currency gains associated with the underlying net liabilities.

14. 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.

-18-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

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:


	March 31, 2024				December 31, 2023
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	528,008	$	522,028	$	531,778	$	521,839
Revolving credit facilities and term loans (Level 2)	615,973		629,286		666,316		681,617
Total debt	$	1,143,981	$	1,151,314	$	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.

15. 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 determine 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.

In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. 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.

-19-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

Lease Commitments

As of March 31, 2024 we have entered into additional lease agreements that have not yet commenced of approximately $58 million.

-20-

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Our financial goal is profitable sales growth. To achieve this goal, we are focused on leveraging our leadership position in services for advanced technologies, providing our customers with a geographically diverse manufacturing footprint, growing within the industry secular growth markets of 5G, automotive, high-performance computing (“HPC”) and Internet-of-Things (“IoT”), optimizing utilization of existing assets, and selectively growing our scale and scope through strategic investments.

We are an industry leader in developing and commercializing advanced packaging and test technologies, which we believe provide substantial value to our customers. Advanced packages, which account for a significant portion of mobile phone semiconductor value, are the preferred choice in the high-end smartphone market. The use of advanced packages in automotive applications is also growing, largely due to new, data-intensive applications which require increased pin count and performance. With the continuing trend towards cloud-based computing and the expanding use of artificial intelligence, innovative advanced packaging solutions are needed to achieve the increased performance and power consumption requirements for this market. In consumer devices, further miniaturization and increasing functionality within IoT devices also require advanced packaging. We believe that demand for advanced packaging services will continue to grow as our customers and leading electronics original equipment manufacturers strive for smaller device geometries, higher levels of integration and performance and lower power consumption. We intend to continue to leverage our investments in advanced technology to meet the demand for these services in high growth markets.

Our broad geographic footprint, including our manufacturing presence in multiple countries across Asia, in Portugal and our headquarters in the United States, is a key differentiator and positions us to continue to support global supply chains and to participate in initiatives to regionalize supply chains. We are preparing to deliver advanced system-in-package (“SiP”) modules and other advanced packages from our Vietnam Facility beginning in the second half of 2024. In addition, we are progressing plans to build an advanced packaging and test facility in Arizona. We believe our unique geographic footprint provides customers with multiple options to mitigate risk and diversify their supply chains.

Another key factor in our success is the optimization of asset utilization. We build and utilize manufacturing lines which support multiple customers, and we increase factory utilization through sophisticated planning processes and intensive efficiency improvement activities.

From time to time, we identify attractive opportunities to strengthen our leadership position and market share through expansion of our operations, joint ventures, acquisitions and other strategic investments. We believe that selective growth through these strategic actions can further strengthen customer relationships, help to maintain and enhance our technological leadership, diversify our revenue streams and improve our profits.

As a supplier in the semiconductor industry, our business is cyclical and impacted by broad economic factors. Historical trends indicate there has been a strong correlation between worldwide gross domestic product levels, consumer spending and semiconductor industry cycles. We believe that the general semiconductor market is currently going through a cyclical correction. The semiconductor industry has experienced significant and sometimes prolonged cyclical upturns and downturns in the past. We cannot predict the timing, strength or duration of any correction, economic slowdown, recession or subsequent economic recovery.

We operate in a capital-intensive industry. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures, which are generally made in advance of the related revenues and without firm customer commitments. We fund our operations, including capital expenditures and debt service requirements, with cash flows from operations, existing cash and cash equivalents, short-term investments, borrowings under available credit facilities and proceeds from any additional financing. Maintaining an appropriate level of liquidity is important to our business and depends on, among other considerations, the performance of our business, our capital expenditure levels, our ability to repay debt out of our operating cash flows or proceeds from debt or equity financings and our investment strategy. As of March 31, 2024, we had cash and cash equivalents and short-term investments of $1,118.0 million and $454.7 million, respectively.

-21-

Our net sales, gross profit, operating income, cash flows, liquidity and capital resources have historically fluctuated significantly from quarter to quarter due to many factors, including the seasonality of our business, the cyclical nature of the semiconductor industry and other factors discussed in the “Risk Factors” section in Part II, Item 1A of this Form 10-Q. We expect macroeconomic conditions to be challenging in the first half of 2024. To prepare for future growth, we will continue to make prudent investments, and we will closely manage capacity expansion and control costs in response to changes in market conditions.

Financial Summary

Our net sales decreased $106.0 million, or 7.2%, to $1,365.5 million for the three months ended March 31, 2024 compared to $1,471.5 million for the three months ended March 31, 2023. The decrease was primarily due to lower sales in our automotive and industrial end market.

Gross margin for the three months ended March 31, 2024 increased to 14.8% compared to 13.2% for the three months ended March 31, 2023. The increase in gross margin was primarily due to the extension of the estimated useful life of our test equipment from five years to seven years, a decrease in the mix of products sold with higher material content and net favorable foreign currency exchange rate movements, partially offset by a decrease in net sales and resulting lower factory utilization.

Operating income margin increased 70 basis points to 5.4% for the three months ended March 31, 2024 from 4.7% for the three months ended March 31, 2023. The increase in our operating income margin was primarily due to the increase in our gross margin discussed above and recovery of bad debt expense, partially offset by costs associated with the opening of the Vietnam Facility and increased employee compensation costs.

Our capital expenditures totaled $96.2 million for the three months ended March 31, 2024 compared to $98.2 million for the three months ended March 31, 2023. Our spending was primarily focused on investments in advanced packaging and test equipment.

Net cash provided by operating activities was $162.3 million for the three months ended March 31, 2024 compared to $175.7 million for the three months ended March 31, 2023. This decrease was primarily due to changes in working capital, offset by higher operating profits.

Results of Operations

The following table sets forth certain operating data as a percentage of net sales for the periods indicated:


	For the Three Months Ended March 31,
	2024		2023
Net sales	100.0	%	100.0	%
Materials	51.9	%	52.9	%
Labor	11.2	%	11.3	%
Other manufacturing costs	22.1	%	22.6	%
Gross margin	14.8	%	13.2	%
Selling, general and administrative	6.6	%	5.3	%
Research and development	2.8	%	3.2	%
Operating income	5.4	%	4.7	%
Net income attributable to Amkor	4.3	%	3.1	%

Net Sales


	For the Three Months Ended March 31,
	2024		2023		Change
	(In thousands, except percentages)
Net sales	$	1,365,511	$	1,471,539	$	(106,028)	(7.2)	%

-22-

The decrease in net sales for the three months ended March 31, 2024 compared to the three months ended March 31, 2023 was primarily due to lower sales in our automotive and industrial end market. This end market decreased 22% compared to 2023, mainly due to elevated customer inventories.

Gross Profit and Gross Margin


	For the Three Months Ended March 31,
	2024			2023			Change
	(In thousands, except percentages)
Gross profit	$	201,643		$	194,421		$	7,222
Gross margin	14.8		%	13.2		%	1.6		%

Our cost of sales consists principally of materials, labor, depreciation and manufacturing overhead. Since a substantial portion of the costs at our factories is fixed, there tends to be a strong relationship between our revenue levels and gross margin. Accordingly, relatively modest increases or decreases in revenue can have a significant effect on margin and on labor and other manufacturing costs as a percentage of revenue, depending on product mix, utilization, foreign currency exchange rate movements and seasonality. We have expanded our business in advanced packaging, which tends to have higher material costs than our other products. As we continue to increase production of these higher material cost products, there could be an impact on our profitability, depending on overall utilization.

Gross profit and gross margin increased for the three months ended March 31, 2024 compared to the three months ended March 31, 2023, primarily due to the extension of the estimated useful life of our test equipment from five years to seven years, a decrease in the mix of products sold with higher material content and net favorable foreign currency exchange rate movements, partially offset by a decrease in net sales and resulting lower factory utilization.

Selling, General and Administrative


	For the Three Months Ended March 31,
	2024		2023		Change
	(In thousands, except percentages)
Selling, general and administrative	$	90,346	$	78,671	$	11,675	14.8	%

Selling, general and administrative expenses increased for the three months ended March 31, 2024 compared to the three months ended March 31, 2023, primarily due to costs associated with the opening of the Vietnam Facility and increased employee compensation costs, partially offset by the recovery of bad debt expense.

Research and Development


	For the Three Months Ended March 31,
	2024		2023		Change
	(In thousands, except percentages)
Research and development	$	38,171	$	47,047	$	(8,876)	(18.9)	%

Research and development activities are focused on developing new packaging and test services and improving the efficiency and capabilities of our existing production processes. The costs related to our technology and product development projects are included in research and development expense until the project moves into production. Once production begins, the costs relating to production become part of the cost of sales, including ongoing depreciation for the equipment previously held for research and development activities.

Research and development expenses decreased for the three months ended March 31, 2024 compared to the three months ended March 31, 2023, primarily due to utilization mix of assets shared with manufacturing and projects moving into production, partially offset by incremental research and development costs in our Portugal facility.

-23-

Other Income and Expense


	For the Three Months Ended March 31,
	2024		2023		Change
	(In thousands, except percentages)
Interest expense	$	16,439	$	16,167	$	272	1.7	%
Interest income	(16,796)		(10,433)		(6,363)		61.0	%
Foreign currency loss (gain), net	1,545		6,763		(5,218)		(77.2)	%

Other, net	(44)		118		(162)		>(100)%
Total other expense, net	$	1,144	$	12,615	$	(11,471)	(90.9)	%

Interest income increased for the three months ended March 31, 2024 compared to the three months ended March 31, 2023, primarily due to increases in our cash and cash equivalent and available-for-sale debt investment balances and higher interest rates.

The changes in foreign currency loss (gain), net for the three months ended March 31, 2024 compared to the three months ended March 31, 2023 were primarily due to managing more of our net monetary exposure with foreign exchange forward contracts and the strengthening of the U.S. dollar compared to the foreign currencies of our subsidiaries, mainly the Japanese yen, and the associated impact on our net monetary exposure.

Income Tax Expense


	For the Three Months Ended March 31,
	2024		2023		Change
	(In thousands)
Income tax expense	$	12,196	$	10,864	$	1,332

Income tax expense, which includes foreign withholding taxes and minimum taxes, reflects the applicable tax rates in effect in the various countries where our income is earned and is subject to volatility depending on the relative mix of earnings in each location. Income tax expense increased for the three months ended March 31, 2024 compared to the three months ended March 31, 2023 primarily due to an increase in income before income taxes.

During the three months ended March 31, 2024 and 2023, our subsidiaries in Korea and Singapore operated under various conditional reduced tax rates. Beginning in 2024, our subsidiary in Vietnam also operated under various conditional reduced tax rates. As these conditional reduced tax rates expire, income earned in these jurisdictions will be subject to higher statutory income tax rates, which may cause our effective tax rate to increase.

See Note 4 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information about our income tax expense.

Liquidity

We assess our liquidity based on our current expectations regarding sales and operating expenses, capital spending, dividend payments, stock and debt repurchases, debt service requirements and other funding needs. Based on this assessment, we believe that our cash flow from operating activities, together with existing cash and cash equivalents, short-term investments and availability under our credit facilities, will be sufficient to fund our working capital, capital expenditures, dividend payments, debt service, debt repurchases and other financial requirements for at least the next twelve months.

Our liquidity is affected by, among other factors, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels, other uses of our cash including any dividends and purchases of stock or debt under any repurchase program, any acquisitions, joint ventures or other investments and our ability to either repay debt out of operating cash flow or refinance it at or prior to maturity with the proceeds from debt or equity offerings. There can be no assurance that we will generate the necessary net income or operating cash flows, or be able to borrow sufficient funds, to meet the funding needs of our business beyond the next twelve months due to a variety of factors,

-24-

including the cyclical nature of the semiconductor industry and other factors discussed in Part II, Item 1A of this Form 10-Q.

Our primary source of cash and the source of funds for our operations are cash flows from operations, current cash and cash equivalents, short-term investments, borrowings under available credit facilities and proceeds from any additional debt or equity financings. Please refer to Note 7 and Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information on our investments and borrowings, respectively.

As of March 31, 2024, we had cash and cash equivalents and short-term investments of $1,572.7 million. Included in our cash and short-term investments balances as of March 31, 2024 is $1,393.1 million held offshore by our foreign subsidiaries. We have the ability to access cash held offshore by our foreign subsidiaries primarily through the repayment of intercompany debt obligations. If we were to distribute this offshore cash to the U.S. as dividends from our foreign subsidiaries, the dividends generally would not be subject to U.S. federal income tax, but the distributions may be subject to foreign withholding and state income taxes.

As of March 31, 2024, our net liability associated with unrecognized tax benefits is $26.7 million. Due to the uncertainty regarding the amount and timing of any future cash outflows associated with our unrecognized tax benefits, we are unable to reasonably estimate the amount and timing of ultimate settlement, if any, with the various taxing authorities.

For 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. Available capacity under these arrangements is dependent on the level of our trade accounts receivable eligible to be sold, the financial institutions’ willingness to purchase such receivables and the limits provided by the financial institutions. These factoring arrangements can be reduced or eliminated at any time due to market conditions and changes in the creditworthiness of customers. For the three months ended March 31, 2024 and 2023, we sold accounts receivable totaling $24.4 million and $78.0 million, respectively, net of discounts and fees. Discounts and fees were insignificant for the three months ended March 31, 2024, and $0.2 million for the three months ended March 31, 2023.

We operate in a capital-intensive industry. Servicing our current and future customers may require that we incur significant operating expenses and make significant investments in equipment and facilities, which are generally made in advance of the related revenues and without firm customer commitments.

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 March 31, 2024, we had availability of $600.0 million. As of March 31, 2024, our foreign subsidiaries had $615.0 million available for future borrowings under revolving credit facilities, including the 2022 Singapore Revolver, and $62.3 million available to be borrowed under term loan credit facilities for working capital purposes and capital expenditures. For additional information regarding the 2022 Singapore Revolver, please refer to Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q.

As of March 31, 2024, we had debt of $1,151.3 million, with $113.0 million payable within 12 months. As of March 31, 2024, the interest payment obligations, based on stated coupon rates for fixed rate debt and interest rates applicable at March 31, 2024 for variable rate debt, were $160.4 million during the remaining term of the debt. Interest payment obligations payable within 12 months is $51.4 million. We were in compliance with all debt covenants as of March 31, 2024, and we expect to remain in compliance with these covenants for at least the next twelve months. For additional information regarding our debt arrangements, please refer to Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q.

Certain of our debt agreements have restrictions on dividend payments and the repurchase of stock and subordinated securities. These restrictions are determined in part by our covenant compliance and on calculations based upon cumulative net income and do not currently have a material impact on our ability to make dividend payments or stock repurchases.

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In order to reduce our debt and future cash interest payments, we may from time to time repurchase or redeem our outstanding senior notes for cash or exchange shares of our common stock for our outstanding senior notes. Any such transaction may be made in the open market, through privately negotiated transactions or otherwise and would be subject to the terms of our indentures and other debt agreements, market conditions and other factors.

Our subsidiary in Korea maintains an unfunded severance plan that covers certain employees who were employed prior to August 1, 2015. As of March 31, 2024, the severance liability was $44.3 million, with $7.5 million payable within 12 months. Accrued severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date. For service periods subsequent to August 1, 2015, employees participate in either a defined benefit pension plan or a defined contribution pension plan. From time to time, we may offer employees the option to convert from the severance plan to the defined contribution plan, which would require us to fund the converted portion of the liability. In addition, as of March 31, 2024, we had foreign pension plan obligations of $42.7 million, for which the timing and actual amount of impact on our future cash flow is uncertain. For additional information regarding our pension and severance plans, please refer to Note 12 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q and in Note 12 to the 2023 Form 10-K.

We lease certain machinery and equipment, office space and manufacturing facilities. As of March 31, 2024, our total remaining operating lease obligations and finance lease obligations were $93.7 million and $114.7 million, respectively, with $30.3 million and $57.4 million payable within 12 months, respectively. The lease obligations represent our future minimum lease payments including interest payments.

We had off-balance sheet purchase obligations for capital expenditures, long-term supply contracts and other contractual commitments. As of March 31, 2024, the purchase obligations were $441.6 million, with $394.9 million payable within 12 months.

Capital Returns

During the three months ended March 31, 2024, we paid total quarterly cash dividends of $19.4 million, and we currently anticipate that we will continue to pay quarterly cash dividends in the future. However, the payment, amount and timing of future dividends remain within the discretion of our Board of Directors and will depend upon our results of operations, financial condition, cash requirements, debt restrictions and other factors.

Capital Resources

We make significant capital expenditures in order to service the demand of our customers, which are primarily focused on investments in advanced packaging and test equipment. During the three months ended March 31, 2024, our capital expenditures totaled $96.2 million.

We expect that our 2024 capital expenditures will be approximately $750 million. Ultimately, the amount of our 2024 capital expenditures will depend on several factors including, among others, the timing and implementation of any capital projects under review, the performance of our business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity to service anticipated customer demand, equipment lead times and the availability of cash flows from operations or financing. We expect that our 2024 capital expenditures related to our planned advanced packaging and test facility in Arizona will be primarily for design and construction planning. The primary sources of funds for our capital expenditures are cash flows from operations, current cash and cash equivalents, short-term investments, borrowings under available credit facilities and proceeds from any additional debt or equity financings. Please refer to Note 7 and Note 11 to our Consolidated Financial Statements in Part 1, Item 1 of this Form 10-Q for additional information on our investments and borrowings, respectively.

In addition, we are subject to risks associated with our capital expenditures, including those discussed in the “Risk Factors” section in Part II, Item 1A of this Form 10-Q under the caption “We make substantial investments in equipment and facilities to support the demand of our customers, which may materially and adversely affect our business if the demand of our customers does not develop as we expect or is adversely affected.”

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Cash Flows

Net cash provided by (used in) operating, investing and financing activities for the three months ended March 31, 2024 and 2023, was as follows:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Operating activities	$	162,312	$	175,746
Investing activities	(86,103)		(155,704)
Financing activities	(69,877)		(66,206)

Operating activities: Our cash flow provided by operating activities for the three months ended March 31, 2024 decreased by $13.4 million compared to the three months ended March 31, 2023, primarily due to changes in working capital, offset by higher operating profits.

Investing activities: Our cash flow used in investing activities for the three months ended March 31, 2024 decreased by $69.6 million compared to the three months ended March 31, 2023, primarily due to lower payments for short-term investments and higher proceeds from maturities of short-term investments, offset by higher net payments for foreign exchange forward contracts.

Financing activities: The net cash used in financing activities for the three months ended March 31, 2024 and 2023 was primarily due to net debt repayments, the payments of our quarterly dividend and finance lease obligations.

We provide the following supplemental data to assist our investors and analysts in understanding our liquidity and capital resources. We define “free cash flow” as net cash provided by operating activities less payments for property, plant and equipment, plus proceeds from the sale of, insurance recovery for and grants for property, plant and equipment, if applicable. Free cash flow is not defined by U.S. GAAP. We believe free cash flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses free cash flow in evaluating our liquidity, our ability to service debt, our ability to fund capital expenditures and our ability to pay dividends and the amount of dividends to be paid. However, free cash flow has certain limitations, including that it does not represent the residual cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of free cash flow may not be comparable to similarly titled measures reported by other companies.


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Net cash provided by operating activities	$	162,312	$	175,746
Payments for property, plant and equipment	(96,169)		(98,224)
Proceeds from sale of and grants for property, plant and equipment	8,022		652
Free cash flow	$	74,165	$	78,174

New Accounting Pronouncements

For information regarding recently adopted and recently issued accounting standards, please refer to Note 1 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market Risk Sensitivity

We are exposed to market risks, primarily related to foreign currency and interest rate fluctuations. In the normal course of business, we employ established policies and procedures to manage the exposure to fluctuations in foreign currency values and changes in interest rates.

Foreign Currency Risk

The U.S. dollar is our reporting and functional currency for our subsidiaries, except for our Japan operations, where the Japanese yen is the functional currency. In order to reduce our exposure to foreign currency gains and losses, we use natural hedging techniques and forward contracts to mitigate foreign currency risk.

We have foreign currency exchange rate risk associated with the remeasurement of monetary assets and liabilities on our Consolidated Balance Sheets that are denominated in currencies other than the functional currency. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2024 to assess the potential impact of fluctuations in exchange rates for all foreign denominated assets and liabilities. Assuming that all foreign currencies appreciated 10% against the U.S. dollar and taking into account our foreign currency forward contracts, our income before taxes for the three months ended March 31, 2024 would have been approximately $13 million lower, due to the remeasurement of monetary assets and liabilities.

In addition, we have foreign currency exchange rate exposure on our results of operations. For the three months ended March 31, 2024, approximately 90% of our net sales were denominated in U.S. dollars. Our remaining net sales were principally denominated in Japanese yen. For the three months ended March 31, 2024, approximately 55% of our cost of sales and operating expenses were denominated in U.S. dollars and were largely for raw materials and costs associated with property, plant and equipment. The remaining portion of our cost of sales and operating expenses was principally denominated in the Asian currencies where our production facilities are located and largely consisted of labor. To the extent that the U.S. dollar weakens against these Asian-based currencies, similar foreign currency denominated income and expenses in the future will result in higher sales, higher cost of sales and operating expenses, with cost of sales and operating expenses having the greater impact on our financial results. Similarly, our sales, cost of sales and operating expenses will decrease if the U.S. dollar strengthens against these foreign currencies. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2024 to assess the potential impact of fluctuations in exchange rates for all foreign denominated sales and operating expenses. Assuming that all foreign currencies appreciated 10% against the U.S. dollar, our operating income for the three months ended March 31, 2024 would have been approximately $35 million lower.

There are inherent limitations in the sensitivity analysis presented, primarily the assumption that foreign exchange rate movements across multiple jurisdictions would change instantaneously in an equal fashion. As a result, the analysis is unable to reflect the potential effects of more complex market or other changes that could arise which may positively or negatively affect our results of operations.

Our Consolidated Financial Statements are impacted by changes in exchange rates at the entity where the local currency is the functional currency. The effect of foreign exchange rate translation for these entities was a loss of $9.0 million and $2.1 million for the three months ended March 31, 2024 and 2023, respectively, and was recognized as an adjustment to equity through other comprehensive income (loss).

Interest Rate Risk

We have interest rate risk with respect to our available-for-sale debt investments. Our investment portfolio consists of various security types and maturities, with our portfolio primarily having maturities of one year or less. Our primary objective with our investment portfolio is to invest available cash while preserving capital and meeting liquidity needs. These securities are subject to interest rate risk and will decrease in value if market interest rates increase. Due to the relatively short-term nature of our investment portfolio, we believe that an immediate increase in interest rates will not have a material impact on the fair value of our available-for-sale debt investments. For information regarding our

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available-for-sale debt investments, see Note 7 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

In addition, we have interest rate risk with respect to our debt. Our fixed and variable rate debt includes foreign borrowings, revolving credit facilities and senior notes. Changes in interest rates have different impacts on the fixed and variable rate portions of our debt portfolio. A change in interest rates on the fixed portion of the debt portfolio impacts the fair value of the debt instrument but has no impact on interest expense or cash flows. A change in interest rates on the variable portion of the debt portfolio impacts the interest incurred and cash flows but will not have a material impact on the fair value of the instrument.

The table below presents the interest rates, maturities and fair value of our fixed and variable rate debt as of March 31, 2024:


	2024 - Remaining			2025			2026			2027			2028			Thereafter			Total			Fair Value
	($ in thousands)
Fixed rate debt	$	84,936		$	125,586		$	111,183		$	618,872		$	73,125		$	—		$	1,013,702		$	1,001,118
Average interest rate	1.4		%	1.7		%	1.8		%	5.9		%	2.0		%	—		%	4.3		%
Variable rate debt	$	8,636		$	91,500		$	43,000		$	—		$	—		$	—		$	143,136		$	142,863
Average interest rate	3.3		%	6.1		%	6.3		%	—		%	—		%	—		%	6.0		%
Total debt maturities	$	93,572		$	217,086		$	154,183		$	618,872		$	73,125		$	—		$	1,156,838		$	1,143,981

For information regarding the fair value of our long-term debt, see Note 14 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our periodic reports to the SEC is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure, based on the definition of “disclosure controls and procedures” in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In designing and evaluating the disclosure controls and procedures, management recognizes that any disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily is required to apply its judgment in evaluating the cost-benefit relationship of possible disclosure controls and procedures.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2024 and concluded those disclosure controls and procedures were effective as of that date.

Changes in Internal Control Over Financial Reporting

We carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of changes to our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act) that occurred during the quarter ended March 31, 2024. There have been no changes in our internal control over financial reporting that occurred during the three months ended March 31, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Information about legal proceedings is set forth in Note 15 to our Consolidated Financial Statements in Part I, Item 1 of this Form 10-Q and in Note 17 to the 2023 Form 10-K.

Item 1A. Risk Factors

The factors discussed below are cautionary statements that identify important factors and risks that could cause actual results to differ materially from those anticipated by the forward-looking statements contained in this Form 10-Q. For more information, see the Forward-Looking Statements within this Form 10-Q. You should carefully consider the risks and uncertainties described below, together with all of the other information included in this Form 10-Q, in considering our business and prospects. The risks and uncertainties described below are not the only ones facing Amkor. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also adversely affect our business operations. The occurrence of any of the risks and uncertainties described below could materially and adversely affect our business, liquidity, results of operations, financial condition or cash flows.

Summary of Risk Factors

An investment in our common stock involves various risks, and you are urged to carefully consider all of the matters discussed in Part II, Item 1A of this Form 10-Q under the caption “Risk Factors” (in addition to those discussed under this “Summary of Risk Factors” section) in considering our business and prospects. The following is a list of some of these risks:

Risks Related to Our Business, Operations and Industry

•competition with established competitors in the packaging and test business, the internal capabilities of integrated device manufacturers (“IDMs”), and new competitors, including foundries;

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

•fluctuations in operating results and cash flows;

•dependence on the cyclical and volatile semiconductor industry and vulnerability to industry downturns and declines in global economic and financial conditions;

•our substantial investments in equipment and facilities to support the demand of our customers;

•difficulty achieving the relatively high-capacity utilization rates necessary to realize satisfactory gross margins given our high percentage of fixed costs;

•our absence of backlog and the short-term nature of our customers’ commitments;

•the historical downward pressure on the prices of our packaging and test services;

•fluctuations in our manufacturing yields;

•a downturn or lower sales to customers in the automotive industry;

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

•difficulty funding our liquidity needs; and

•challenges with integrating diverse operations.

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Risks Related to Our International Sales and Operations

•dependence on international factories and operations, and risks relating to trade restrictions and regional conflict; and

•significant severance plan obligations associated with our manufacturing operations in Korea.

Risks Related to Cybersecurity, Data Privacy and Intellectual Property

•our ability to develop new proprietary technology, protect our proprietary technology, operate without infringing the proprietary rights of others, and implement new technologies; and

•our continuing development and implementation of changes to, and maintenance and security of, our information technology systems.

Risks Related to Our Indebtedness

•restrictive covenants in the indentures and agreements governing our current and future indebtedness;

•our substantial indebtedness; and

•fluctuations in interest rates and changes in credit risk.

Risks Related to Our Common Stock

•the ability of certain of our stockholders to effectively determine or substantially influence the outcome of matters requiring stockholder approval; and

•the possibility that we may decrease or suspend our quarterly dividend.

Risks Related to Human Capital and Management

•difficulty attracting, retaining or replacing qualified personnel.

Risks Related to Regulatory, Legal and Tax Challenges

•warranty claims, product return and liability risks, and the risk of negative publicity if our products fail, as well as the risk of litigation incident to our business;

•maintaining an effective system of internal controls;

•any changes in tax laws, taxing authorities not agreeing with our interpretation of applicable tax laws, including whether we continue to qualify for conditional reduced tax rates, or any requirements to establish or adjust valuation allowances on deferred tax assets; and

•environmental, health and safety liabilities and expenditures.

General Risk Factors

•health conditions or pandemics, such as the Covid-19 pandemic, impacting labor availability and operating capacity, capital availability, the supply chain and consumer demand for our customers’ products and services; and

•natural disasters and other calamities, health conditions or pandemics, political instability, hostilities or other disruptions.

Risks Related to Our Business, Operations and Industry

Our packaging and test services are used in volatile industries, and industry downturns and declines in global economic and financial conditions could harm our performance.

Our business is impacted by market conditions in the semiconductor industry, which is cyclical by nature and impacted by broad economic factors, such as worldwide gross domestic product and consumer spending. We believe that the general semiconductor market is currently going through a cyclical correction. The semiconductor industry has

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experienced significant and sometimes sudden and prolonged downturns in the past. If the industry or markets in which we compete experience slower, or even negative growth, our business and results of operations may be materially and adversely affected.

Since our business is, and will continue to be, dependent on the requirements of semiconductor companies for outsourced packaging and test services, any downturn in the semiconductor industry or any other industry that uses a significant number of semiconductor devices, such as telecommunications, automotive, computing, or consumer electronics, could have a material adverse effect on our business and operating results. During downturns, we have experienced, among other things, reduced demand, excess capacity and reduced sales. For example, the Covid-19 pandemic disrupted demand in the automotive and industrial end market in 2020, and during 2019, there was weakness in the general market and an inventory correction in the smartphone market.

Our business may suffer if the cost, quality or supply of materials or equipment changes adversely.

We obtain the materials and equipment required for the packaging and test services performed by our factories from various vendors. We source most of our materials, including critical materials such as leadframes, laminate substrates and gold wire, from a limited group of suppliers. A disruption to the operations of one or more of our suppliers could extend lead times for materials and equipment and have a negative impact on our business. For example, the Covid-19 pandemic and resulting supply chain disruptions and economic turbulence created extended lead times for some materials and equipment, and furthermore, fire, severe weather, earthquakes, flooding and tsunamis in the past have impacted the supply of specialty chemicals, substrates, silicon wafers, equipment and other supplies to the electronics industry.

In addition, we purchase the majority of our materials on a purchase order basis. Our business may be harmed if we cannot obtain materials and other supplies from our vendors in a timely manner, in sufficient quantities, at acceptable quality or at competitive prices or are unable to increase our prices sufficiently to recover inflationary price increases in materials or supplies. Some of our customers are also dependent on a limited number of suppliers for certain materials and silicon wafers. Shortages or disruptions in our customers’ supply channels, including any disruptions arising out of the conflicts in Ukraine and Israel or other future conflicts, could have a material adverse effect on our business, financial condition, results of operations and cash flows.

SEC rules and related industry initiatives require diligence and disclosure regarding the use of certain minerals originating from the conflict zones of the Democratic Republic of Congo and adjoining countries. Many of our customers’ initiatives require us to certify that the covered materials we use in our packages do not come from the conflict areas. We incur costs associated with complying with these requirements and customer initiatives, and we may be required to increase our efforts in the future to cover additional materials and geographic areas. These requirements and customer initiatives could affect the pricing, sourcing and availability of materials used in the manufacture of semiconductor devices, and we cannot assure you that we will be able to obtain conflict-free materials or other materials covered by customer initiatives in sufficient quantities and at competitive prices or that we will be able to verify the origin of all of the materials we procure. If we are unable to meet these requirements and customer initiatives, some customers may move their business to other suppliers, and our reputation and business could be materially and adversely affected.

We purchase new packaging and test equipment to maintain and expand our operations. From time to time, increased demand for new equipment or supply chain disruptions and economic turbulence may cause lead times to extend beyond those normally required by equipment vendors. In periods of increased demand and reduced availability, equipment suppliers may delay orders or only partially satisfy our equipment orders in the normal time frame. The unavailability of equipment or failures to deliver equipment on a timely basis could delay or impair our ability to meet customer orders. If we are unable to meet customer orders, we could lose potential and existing customers. Generally, we acquire our equipment on a purchase order basis and do not enter into long-term equipment agreements. As a result, depending on market conditions, we could experience adverse changes in pricing, currency risk and potential shortages in equipment, any of which could have a material adverse effect on our results of operations.

We are a large buyer of gold and other commodity materials, including substrates and copper. The prices of gold and other commodities used in our business fluctuate. Historically, we have been able to partially offset the effect of commodity price increases through price adjustments to some customers and changes in our product designs that reduce the material content and cost, such as the use of shorter, thinner gold wire and migration to copper wire. However, we

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typically do not have long-term contracts that permit us to impose price adjustments, and market conditions may limit our ability to do so. Significant price increases may materially and adversely impact our gross margin in future periods to the extent we are unable to pass along past or future commodity price increases to our customers.

Our operating results and cash flows have varied and may vary significantly as a result of factors that we cannot control.

Many factors could have a material adverse effect on our net sales, gross profit, operating results and cash flows or lead to significant variability of quarterly or annual operating results. 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.

Our net sales, gross margin, gross profit, operating income, net income and cash flows have historically fluctuated significantly from quarter to quarter as a result of many of the following factors, over which we have little or no control and which we expect to continue to impact our business:

•fluctuations 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;

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

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

•our ability to achieve our major growth objectives, including transitioning second-wave customers to advanced packages and increasing our share of the automotive and industrial end market;

•changes in our capacity and capacity utilization rates;

•fluctuations in interest rates and currency exchange rates, including the current rising interest rate environment;

•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;

•fluctuations in our manufacturing yields;

•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;

•the 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;

•the timing of expenditures in anticipation of future orders;

•changes in effective tax rates;

•the availability and cost of financing;

•leverage and debt covenants;

•intellectual property transactions and disputes;

•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;

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•political instability, conflicts (such as the ongoing conflict in Ukraine and Israel) and government shutdowns, civil disturbances and international events;

•environmental or natural disasters such as earthquakes, typhoons and volcanic eruptions;

•pandemics or other widespread illnesses that may impact our labor force, operations, liquidity, supply chain and end-user demand for products which incorporate semiconductors, such as the Covid-19 pandemic;

•costs of acquisitions and divestitures and difficulties integrating acquisitions;

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

•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.

On October 7, 2022 and October 17, 2023, the U.S. Bureau of Industry and Security announced export control regulations applicable to Chinese acquisition of U.S. semiconductor technology (collectively, the “BIS Regulations”). The above factors, in addition to the BIS Regulations and other similarly restrictive trade barriers adopted by U.S. and foreign governments applicable to the semiconductor supply chain, could impact our business and the businesses of our customers. These factors may have a material and adverse effect on our business, liquidity, results of operations, financial condition and cash flows or lead to significant volatility in our quarterly or annual operating results. In addition, these factors may materially and adversely affect our credit ratings, which could make it more difficult and expensive for us to raise capital and could materially and adversely affect the price of our securities.

We compete against established competitors in the packaging and test business as well as internal capabilities of IDMs and face competition from new competitors, including foundries.

The outsourced semiconductor packaging and test services market is very competitive. We face substantial competition from established and emerging packaging and test service providers primarily located in Asia, including companies with significantly greater processing capacity, financial resources, local presence, research and development operations, marketing, technology and other capabilities. In addition, we may compete with electronics manufacturing service providers or contract electronics manufacturers that also provide advanced integrated device solutions. We also may face increased competition from domestic companies located in China, where there are government-supported efforts to promote and subsidize the development and growth of the local semiconductor industry. We may be at a disadvantage in attempting to compete with entities associated with such government-supported initiatives based on their lower cost of capital, access to government resources and incentives, preferential sourcing practices, stronger local relationships or otherwise. Our competitors may also have established relationships, or enter into new strategic relationships, with one or more of the large semiconductor companies that are our current or potential customers or key suppliers to these customers. Consolidation among our competitors could also strengthen their competitive position.

Historically, we have also been dependent on the trend in outsourcing of packaging and test services by IDM and foundry customers. Our IDM and foundry customers continually evaluate the need for outsourced services against their own in-house packaging and test services. As a result, at any time and for a variety of reasons, IDMs and foundries may decide to shift some or all of their outsourced packaging and test services to internally sourced capacity. To the extent we limit capacity commitments for certain customers, these customers may increase their level of in-house packaging and test capabilities, which could make it more difficult for us to regain their business when we have available capacity. If we experience a significant loss of IDM or foundry business, it could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows, especially during a prolonged industry downturn.

We also face competition from contract foundries, such as Taiwan Semiconductor Manufacturing Company Limited and Samsung Electronics Co., Ltd., which offer full turnkey services from silicon wafer fabrication through packaging and final test. These foundries, which are substantially larger than us and have greater financial resources than we do, have expanded their operations to include packaging and test services and may continue to expand these capabilities in the future. If a key customer decides to purchase wafers from a semiconductor foundry that provides packaging and test

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services, our business could be adversely affected if the customer also engages that foundry for related packaging and test services.

We cannot assure you that we will be able to compete successfully in the future against our existing or potential competitors, that our customers will not rely on internal sources or foundries for packaging and test services or that our business, liquidity, results of operations, financial condition or cash flows will not be materially and adversely affected by such increased competition.

We make substantial investments in equipment and facilities to support the demand of our customers, which may materially and adversely affect our business if the demand of our customers does not develop as we expect or is adversely affected.

We make significant investments in equipment and facilities in order to service the demand of our customers. The amount of our capital expenditures depends on several factors, including the performance of our business, our assessment of future industry and customer demand, our capacity utilization levels and availability, advances in technology, our liquidity position and the availability of financing. Our ongoing capital expenditure requirements may strain our cash and liquidity, and, in periods when we are expanding our capital base, we expect that depreciation expense and factory operating expenses associated with capital expenditures to increase production capacity will put downward pressure on our gross profit, at least in the near term. From time to time, we also make significant capital expenditures based on specific business opportunities with one or a few key customers, and the additional equipment purchased may not be readily usable to support other customers. If demand is insufficient to fill our capacity, or we are unable to efficiently redeploy such equipment, our capacity utilization and gross profit could be negatively impacted.

Furthermore, if we cannot generate or raise additional funds to pay for capital expenditures, particularly in some of the advanced packaging and bumping areas, as well as research and development activities, our growth and future profitability may be materially and adversely affected. Our ability to obtain external financing in the future is subject to a variety of uncertainties, including: 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.

In October 2023, we completed the initial phase of construction for our Vietnam Facility. There can be no assurance, however, that high-volume manufacturing will begin on schedule or that the actual scope, costs or benefits of the project will be consistent with our current expectations.

Due to our high percentage of fixed costs, we may be unable to maintain satisfactory gross margins if we are unable to achieve relatively high-capacity utilization rates.

Our operations are characterized by high fixed costs and the absence of any material backlog. Our profitability depends in part not only on pricing levels for our packaging and test services but also on the efficient utilization of our human resources and packaging and test equipment. Increases or decreases in our capacity utilization can significantly affect gross margins. Transitions between different packaging technologies can also impact our capacity utilization if we do not efficiently redeploy our equipment for other packaging and test opportunities. We cannot assure you that we will be able to achieve consistently high-capacity utilization, and if we fail to do so, our gross margins may be negatively impacted.

In addition, our fixed operating costs have increased as a result of capital expenditures for capacity expansion. The anticipated customer demand for which we have made capital investments may not materialize, and our sales may not adequately cover fixed costs, resulting in reduced profit levels or even significant losses, either of which may materially and adversely impact our business, liquidity, results of operations, financial condition and cash flows.

The lack of contractually committed customer demand may materially and adversely affect our sales.

Our packaging and test business does not typically operate with any material backlog. Our quarterly net sales from packaging and test services are substantially dependent upon our customers’ demand in that quarter. Generally, our customers do not commit to purchase any significant amount of packaging or test services or provide us with binding forecasts of demand for packaging and test services for any future period, in any material amount. In addition, we sometimes experience double booking by customers, and our customers often reduce, cancel or delay their purchases of packaging and test services for a variety of reasons, including industry-wide, customer-specific and Amkor-specific

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reasons. This makes it difficult for us to forecast our capacity utilization and net sales in future periods. Since a large portion of our costs is fixed and our expense levels are based in part on our expectations of future sales, we may not be able to adjust costs in a timely manner to compensate for any sales shortfall. If we are unable to adjust costs in a timely manner, our margins, operating results, financial condition and cash flows could be materially and adversely affected.

Historically, there has been downward pressure on the prices of our packaging and test services.

Prices for packaging and test services have generally declined over time, and sometimes prices can change significantly in relatively short periods of time. We expect downward pressure on average selling prices for our packaging and test services to continue in the future, and this pressure may intensify during downturns in business. If we experience declining average selling prices and are unable to offset such declines by developing and marketing new packages with higher prices, reducing our purchasing costs, recovering more of our material cost increases from our customers and reducing our manufacturing costs, our business, liquidity, results of operations, financial condition and cash flows could be materially and adversely affected.

Packaging and test processes are complex, and our production yields and customer relationships may suffer from defects in the services we provide or if we do not successfully implement new technologies.

Semiconductor packaging and test services are complex processes that require significant technological and process expertise, and in line with industry practice, customers usually require us to pass a lengthy and rigorous qualification process that may take several months. Once qualified and in production, defective packages primarily result from one or more of the following:

•contaminants in the manufacturing environment;

•human error;

•equipment malfunction;

•changing processes to address environmental requirements;

•defective raw materials; or

•defective plating services.

Test is also complex and involves sophisticated equipment and software. Similar to many software programs, these software programs are complex and may contain programming errors or “bugs.” The test equipment is also subject to malfunction, and the test process is subject to operator error.

These and other factors have, from time to time, contributed to lower production yields. They may also do so in the future, particularly as we adjust our capacity, change our processing steps or ramp new technologies. In addition, we must continue to develop and implement new packaging and test technologies and expand our offering of packages to be competitive. Our production yields on new packages, particularly those packages which are based on new technologies, typically are significantly lower than our production yields on our more established packages.

Our failure to qualify new processes, maintain quality standards or acceptable production yields, if significant and prolonged, could result in the loss of customers, increased costs of production, delays, substantial amounts of returned goods and claims by customers relating thereto. Any of these problems could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

A significant portion of our revenue is derived from customers in the automotive industry. A downturn or lower sales to customers in the automotive industry could materially affect our business and results of operations.

A significant portion of our sales are to customers within the automotive industry. The automotive industry is cyclical, and, as a result, our customers in the automotive end-market are sensitive to changes in general economic conditions, inflationary pressure, disruptive innovation and end-market preferences, which can adversely affect sales of our products and, correspondingly, our results of operations. The automotive industry is also subject to long design-in time frames, long product life cycles and a high degree of regulatory and safety requirements, necessitating suppliers to the industry to comply with stringent qualification processes, very low defect rates and high reliability standards, all of which result in

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significant operational challenges, risk to our results of operations, and increased costs of our investments in serving customers in the automotive end-market. Additionally, the quantity and price of our products sold to customers in the automotive end-market could decline despite continued growth in such end-market. Lower sales to customers in the automotive end-market may have a material adverse effect on our business and results of operations.

The loss of certain customers or reduced orders or pricing from existing customers may have a material adverse effect on our operations and financial results.

We have derived and expect to continue to derive a large portion of our revenues from a small group of customers during any particular period due in part to the concentration of market share in the semiconductor industry. Our ten largest customers accounted for, in the aggregate, 69% of our net sales for the year ended December 31, 2023. In addition, we have significant customer concentration within our end markets. The loss of a significant customer, a business combination among our customers, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant commercial arrangements may result in a decline in our sales and profitability and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

The demand for our services from each customer is directly dependent upon that customer’s financial health, level of business activity and purchasing decisions, the quality and price of our services, our cycle time and delivery performance, the customer’s qualification of additional competitors on products we package or test and a number of other factors. Each of these factors could vary significantly from time to time resulting in the loss or reduction of customer orders, and we cannot be sure that our key customers or any other customers will continue to place orders with us in the future at the same levels as in past periods.

For example, as seen in the automotive end market in 2020, the Covid-19 pandemic and restrictions imposed by governmental authorities to mitigate the spread of Covid-19 may decrease demand for our customers’ products and services, thereby adversely impacting their demand for our services.

In addition, from time to time, we may acquire or build new facilities or migrate existing business among our facilities. In connection with these facility changes or new facility constructions, our customers require us to qualify the new facilities even though we have already qualified to perform the services at our other facilities. We cannot assure that we will successfully qualify facility changes, that we will complete construction of new facilities in a timely manner or that our customers will not qualify our competitors and move the business for such services.

We may have difficulty funding liquidity needs.

We assess our liquidity based on our current expectations regarding sales and operating expenses, capital spending, dividend payments, stock repurchases, debt service requirements and other funding needs. We fund our operations, including capital expenditures and other investments and servicing principal and interest obligations with respect to our debt, from cash flows from our operations, existing cash and cash equivalents, borrowings under available debt facilities, or proceeds from any additional debt or equity financing. Our liquidity is affected by, among other factors, volatility in the global economy and credit markets, the performance of our business, our capital expenditures and other investment levels, other uses of our cash, including any payments of dividends and purchases of stock under any stock repurchase program, any acquisitions or investments in joint ventures and any decisions we might make to either repay debt and other long-term obligations out of our operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings.

Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures and other investments, and the amount of our capital expenditures for 2024 and thereafter may vary materially and will depend on several factors. These factors include, among others, the amount, timing and implementation of our capital projects, the performance of our business, economic and market conditions, advances in technology, the cash needs and investment opportunities for the business, the need for additional capacity and facilities and the availability of cash flows from operations or financing.

The health of the worldwide banking system and capital markets also affects our liquidity. If financial institutions that have extended credit commitments to us are adversely affected by the conditions of the United States, foreign or international banking system and capital markets (including as a result of rising interest rates, economic downturns or other developments), they may refuse or be unable to fund borrowings under their credit commitments to us. The U.S.

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Federal Reserve has raised interest rates several times during 2022 and 2023. Volatility in the banking system and capital markets, as well as any further increase in interest rates or adverse economic, political, public health or other global conditions, could also make it difficult or more expensive for us to maintain our existing credit facilities or refinance our debt.

The trading price of our common stock has been, and is likely to continue to be, highly volatile and could be subject to wide fluctuations. Such fluctuations could impact our decision or ability to utilize the equity markets as a potential source of our funding needs in the future.

In addition, there is a risk that we could fail to generate the necessary net income or operating cash flows to meet the funding needs of our business due to a variety of factors, including the other factors discussed in this “Risk Factors” section. If we fail to generate the necessary cash flows or we are unable to access the capital markets when needed, our liquidity could be materially and adversely impacted.

We face challenges as we integrate diverse operations.

We have experienced, and expect to continue to experience, change in the scope and complexity of our operations resulting primarily from existing and future facility and operational consolidations, facility and operational expansions, strategic acquisitions, joint ventures and other partnering arrangements. Some of the risks from these activities include those associated with the following:

•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;

•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.

In connection with these activities, we may:

•incur costs associated with personnel reductions and voluntary retirement programs;

•record restructuring charges to cover costs associated with facility consolidations and related cost reduction initiatives;

•use a significant portion of our available cash;

•incur substantial debt;

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

•incur or assume known or unknown contingent liabilities; and

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

For example, the businesses we have acquired had, at the time of acquisition, multiple systems for managing their own production, sales, inventory and other operations. Migrating these businesses to our systems typically is a slow, expensive process requiring us to divert significant resources from other parts of our operations. We may continue to face these challenges in the future. As a result of the risks discussed above, the anticipated benefits of these or other future acquisitions, consolidations and partnering arrangements may not be fully realized, if at all, and these activities could have a material adverse effect on our business, financial condition and results of operations.

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Risks Related to Our International Sales and Operations

Our factories and operations, and those of our customers and vendors, are located in various foreign jurisdictions, which exposes us to risks arising from international trade restrictions and regional conflict.

We provide packaging and test services through our factories and other operations located in China, Japan, Korea, Malaysia, the Philippines, Portugal, Singapore and Taiwan and are preparing to offer packaging and test services from the Vietnam Facility. Substantially all of our property, plant and equipment is located outside of the United States, and many of our customers and the vendors in our supply chain are also located outside the United States. The following are some of the risks we face in doing business internationally:

•restrictive trade barriers considered or adopted by U.S. and foreign governments applicable to the semiconductor supply chain, including laws, rules, regulations and policies in areas such as national security, licensing requirements for exports, tariffs, customs and duties, including the export rules and regulations applicable to U.S. companies that sell certain semiconductor and chipmaking equipment products to customers in China;

•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;

•health and safety concerns, including widespread outbreak of infectious diseases, such as Covid-19, and governmental responses thereto;

•changes in consumer demand resulting from current or expected inflation or other variations in local economies;

•laws, rules, regulations and policies imposed by U.S. or foreign governments in areas such as data privacy, cybersecurity, antitrust and competition, tax, currency and banking, labor, environmental, and health and safety;

•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 U.S. dollar to Japanese yen exchange rate for our operations in Japan;

•political and social conditions, and the potential for civil unrest, terrorism or other hostilities (such as the ongoing conflicts in Ukraine and Israel);

•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 United States and in other jurisdictions; 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 U.S. Foreign Corrupt Practices Act and other anti-corruption laws and regulations.

Many of these factors and risks are present and may be heightened within our business operations in China. For example, changes in U.S.-China relations, the political environment or international trade policies could result in further revisions to laws or regulations or their interpretation and enforcement, increased taxation, trade sanctions, the imposition of import or export duties and tariffs, restrictions on imports or exports, currency revaluations or retaliatory actions, which have had and may continue to have an adverse effect on our business plans and operating results. Additionally, the BIS Regulations place limitations on the ability of companies to export certain advanced computing semiconductor chips, as well as chipmaking equipment, by requiring companies to obtain licenses to export such products and equipment into China or other designated countries. These expanded export restrictions limit our ability to sell to certain Chinese companies and to third parties that do business with those companies. Certain of the Company’s

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competitors may be exempt from the BIS Regulations by virtue of being non-U.S. manufacturers. To the extent required, Amkor would evaluate pursuing export licenses and authorizations, but there can be no assurances that Amkor would obtain such licenses or authorizations on a timely or cost-effective basis or at all, or that our customers will not reroute business that would have otherwise been given to Amkor to one or more of our competitors as a result of the BIS Regulations, particularly if our competitors have, or are not required to have, required licenses or authorizations that we have not obtained. It is also possible that government agencies in China or in other countries may adopt retaliatory export control rules in response to the BIS Regulations, which could further impact our business, liquidity, results of operations, financial condition and cash flows. These restrictions have created, and these and similar restrictions may continue to create, uncertainty and caution with our current or prospective customers and may cause them to amass large inventories of our products, replace our products with products from another supplier that is not subject to the export restrictions or focus on building indigenous semiconductor capacity to reduce reliance on U.S. suppliers. Furthermore, if these export restrictions cause our current or potential customers to view U.S. companies as unreliable, we could suffer reputational damage or lose business to foreign competitors who are not subject to such export restrictions, and our business could be materially harmed. We are continuing to evaluate the impact of these restrictions on our business, but these actions may have direct and indirect material adverse impacts on our revenues and results of operations in China and elsewhere. In addition, our success in the Chinese markets may be adversely affected by China’s evolving policies, laws and regulations, including those relating to antitrust, cybersecurity, data protection and data privacy, the environment, indigenous innovation and the promotion of a domestic semiconductor industry and intellectual property rights and enforcement and protection of those rights.

We also have significant facilities and other investments in Korea, and there have been heightened security concerns in recent years stemming from North Korea’s nuclear weapon and long-range missile programs as well as its military actions in the region. Furthermore, there has been a history of conflict and tension within and among other countries in the region.

The Covid-19 pandemic impacted our operations and the operations of our customers and suppliers as a result of illness, quarantines, facility closures and travel and logistics restrictions in connection with the outbreak. National, regional, and local governments implemented, and may implement in the future, public health measures to mitigate the spread of Covid-19, the emergence of new variants or the re-emergence of Covid-19 in jurisdictions in which we, our customers and our suppliers operate, and such restrictions may materially and adversely impact our operations and the operations of our customers and suppliers. Such restrictions may also affect end-user demand in each geography where our customers sell their products and services, which may materially and adversely affect demand for our services, our operating results and our financial condition.

We have significant severance plan obligations associated with our manufacturing operations in Korea which could reduce our cash flow and negatively impact our financial condition.

Our subsidiary in Korea maintains an unfunded severance plan, under which we have an accrued liability of $44.3 million as of March 31, 2024. The plan covers certain employees that were employed prior to August 1, 2015. In the event of a significant layoff or other reduction in our labor force in Korea, our subsidiary in Korea would be required to make lump-sum severance payments under the plan, which could have a material adverse effect on our liquidity, financial condition and cash flows. We have made, and may in the future make, offers to some or all of the covered employees the option to convert from the severance plan to a defined contribution plan. Some employees have accepted previous offers, and future offers to make similar conversions could impact the timing of future payments, reducing our cash flow and materially and adversely affecting our financial condition.

Risks Related to Cybersecurity, Data Privacy and Intellectual Property

Our business will suffer if we are not able to develop new proprietary technology, protect our proprietary technology and operate without infringing the proprietary rights of others.

The complexity and scope of semiconductor packaging, SiP modules and test services are rapidly increasing. As a result, we expect to develop, acquire and implement new manufacturing processes and packaging technologies and tools in order to respond to competitive industry conditions and customer requirements. Technological advances may lead to rapid and significant price erosion and may make our existing packages less competitive or our existing inventories

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obsolete. If we cannot achieve advances in packaging design or obtain access to advanced packaging designs developed by others, our business could suffer.

The need to develop and maintain advanced packaging capabilities and equipment could require significant research and development, capital expenditures and acquisitions in future years. In addition, converting to new packaging designs or process methodologies could result in delays in producing new package types, which could impact our ability to meet customer orders and materially and adversely impact our business.

Although we seek patent protection for some of our technology under U.S. and foreign patent laws, the process of seeking patent protection takes a long time and is expensive. There can be no assurance that patents will issue from pending or future applications or that, if patents are issued, the rights granted under the patents will provide us with meaningful protection or any commercial advantage. Any patents we do obtain may be challenged, invalidated or circumvented and will eventually expire. As a result, such patents may not offer us meaningful protection or provide the commercial advantage for which they were designed.

Some of our technologies are not covered by any patent or patent application. The confidentiality agreements on which we rely to protect these technologies may be breached or may not be adequate to protect our proprietary technologies. There can be no assurance that other countries in which we market our services will protect our intellectual property rights to the same extent as the United States.

Our competitors may develop, patent or gain access to know-how and technology similar or superior to our own. In addition, many of our patents are subject to cross licenses, several of which are with our competitors. The semiconductor industry is characterized by frequent claims regarding the infringement of patent and other intellectual property rights. If any third party makes an enforceable infringement claim against us or our customers, we could be required to:

•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.

We may need to enforce our patents or other intellectual property rights, including our rights under patent and intellectual property licenses with third parties, or defend ourselves against claimed infringement of the rights of others through litigation, which could result in substantial cost and diversion of our resources and may not be successful. Furthermore, if we fail to obtain necessary licenses, our business could suffer, and we could be exposed to claims for damages and injunctions from third parties, as well as claims from our customers for indemnification. Unfavorable outcomes in any legal proceedings involving intellectual property could result in significant liabilities or loss of commercial advantage and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows. The potential impact from the legal proceedings referred to in this Form 10-Q on our results of operations, financial condition and cash flows could change in the future.

We face risks in connection with the continuing development and implementation of changes to, and maintenance and security of, our information technology systems.

We depend on our information technology systems for many aspects of our business. Our systems may be susceptible to damage, disruptions or shutdowns due to failures during the process of upgrading, replacing or maintaining software, databases or components thereof, power outages, hardware failures, interruption or failures of third-party provider systems, computer viruses, attacks by computer hackers, ransomware attacks, telecommunication failures, user errors, malfeasance or catastrophic events. Such events have occurred in the past and may occur in the future. Cybersecurity breaches could result in unauthorized disclosure of confidential information and/or disruptions to our operations. While we have not experienced a material information security breach, we cannot be sure that such a breach will not occur in the future. The information technology systems in our factories are at varying levels of sophistication and maturity as the factories have different sets of products, processes and customer expectations. Some of our key software has been developed by our own programmers, and this software may not be easily integrated with other software and systems.

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From time to time, we make additions or changes to our information technology systems. For example, we continue to further integrate information technology systems in our facilities in Japan into our existing systems and processes. We face risks in connection with current and future projects to install or integrate new information technology systems or upgrade our existing systems. These risks include:

•delays in the design and implementation of the system;

•costs may exceed our plans and expectations; and

•disruptions resulting from the implementation, integration or cybersecurity breach 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.

Our business could be materially and adversely affected if our information technology systems are disrupted or if we are unable to successfully install new systems or improve, upgrade, integrate or expand upon our existing systems. We maintain insurance policies for various types of information security risks, including network security and privacy liability for third party claims, and business interruption and system failure reimbursement coverage, but we do not carry insurance for all the above referred risks. With regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be materially and adversely affected by a disruption, failure or breach of our information technology systems.

Risks Related to Our Indebtedness

Covenants in the indentures and agreements governing our current and future indebtedness could restrict our operating flexibility.

The indentures and agreements governing our existing debt contain, and debt we incur in the future may contain, affirmative and negative covenants that materially limit our ability to take certain actions, including our ability to incur debt, pay dividends and repurchase stock, make certain investments and other payments, enter into certain mergers and consolidations, engage in sale leaseback transactions and encumber and dispose of assets. In addition, certain of our debt agreements contain, and our future debt agreements may contain, financial covenants and ratios.

The breach of any of these covenants by us, or the failure by us to meet any of the financial ratios or conditions, could result in a default under any or all of such indebtedness. If a default occurs under any such indebtedness, all of the outstanding obligations thereunder could become immediately due and payable, which could result in a default under our other outstanding debt and could lead to an acceleration of obligations related to other outstanding debt. The existence of such a default or event of default could also preclude us from borrowing funds under our revolving credit facilities. Our ability to comply with the provisions of the indentures, credit facilities and other agreements governing our outstanding debt and indebtedness we may incur in the future can be affected by events beyond our control, and a default under any debt instrument, if not cured or waived, could have a material adverse effect on us.

Our substantial indebtedness could have a material adverse effect on our financial condition and prevent us from fulfilling our obligations.

We have a substantial amount of debt, and the terms of the agreements governing our indebtedness allow us and our subsidiaries to incur more debt, subject to certain limitations. As of March 31, 2024, our total debt balance was $1,151.3 million, of which $113.0 million was classified as a current liability and $627.7 million was collateralized indebtedness at our subsidiaries. We may consider investments in joint ventures, increased capital expenditures, refinancings or acquisitions which may increase our indebtedness. If new debt is added to our consolidated debt level, the related risks that we face could increase.

Our substantial indebtedness could:

•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;

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•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 covenants in our indebtedness, 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.

We are exposed to fluctuations in interest rates and changes in credit risk, which could have a material adverse impact on our earnings as it relates to the market value of our investment portfolio.

We maintain an investment portfolio of various holdings, types and maturities. Our portfolio includes available-for-sale debt investments, the values of which are subject to market price volatility resulting from interest rate movements, changes in credit risk and financial market conditions. If such investments suffer market price declines, we may recognize in earnings the decline in the fair value of our investments below their cost basis when the decline is judged to be an impairment, including an allowance for credit loss.

Risks Related to Our Common Stock

James J. Kim and members of his family can effectively determine or substantially influence the outcome of all matters requiring stockholder approval.

As of March 31, 2024, James J. Kim, the Executive Chairman of our Board of Directors, Susan Y. Kim, the Executive Vice Chairman of our Board of Directors, and members of the Kim family and affiliates owned approximately 132.0 million shares, or approximately 54%, of our outstanding common stock. The Kim family also has options to acquire approximately 0.6 million shares. If the options are exercised, the Kim family’s total ownership would be an aggregate of approximately 132.6 million shares, or approximately 54% of our outstanding common stock.

In June 2013, the Kim family exchanged convertible notes issued by Amkor in 2009 for approximately 49.6 million shares of common stock (the “Convert Shares”). As of March 31, 2024, the Kim family owns 39.6 million Convert Shares. The Convert Shares owned by the Kim family are subject to a voting agreement. The voting agreement requires the Kim family to vote these shares in a “neutral manner” on all matters submitted to our stockholders for a vote, so that such Convert Shares are voted in the same proportion as all of the other outstanding securities (excluding the other shares owned by the Kim family) that are actually voted on a proposal submitted to Amkor’s stockholders for approval. The Kim family is not required to vote in a “neutral manner” any Convert Shares that, when aggregated with all other voting shares held by the Kim family, represent 41.6% or less of the total then-outstanding voting shares of our common stock. The voting agreement for the Convert Shares terminates upon the earliest of (i) such time as the Kim family no longer beneficially owns any of the Convert Shares, (ii) consummation of a change of control (as defined in the voting agreement) or (iii) the mutual agreement of the Kim family and Amkor.

Mr. Kim and his family and affiliates, acting together, have the ability to effectively determine or substantially influence matters submitted for approval by our stockholders including the election of our Board of Directors, by voting their shares or otherwise acting by written consent. There is also the potential, through the election of members of our Board of Directors, that the Kim family could substantially influence matters decided upon by our Board of Directors. This concentration of ownership may also have the effect of impeding a merger, consolidation, takeover or other business consolidation involving us, or discouraging a potential acquirer from making a tender offer for our shares, and could also

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negatively affect our stock’s market price or decrease any premium over market price that an acquirer might otherwise pay. Concentration of ownership also reduces the public float of our common stock. There may be less liquidity and higher price volatility for the stock of companies with a smaller public float compared to companies with broader public ownership. Also, the sale or the prospect of the sale of a substantial portion of the Kim family shares may cause the market price of our stock to decline significantly.

We may decrease or suspend our quarterly dividend, and any decrease in or suspension of the dividend could cause our stock price to decline.

Since October 2020, we have declared a regular quarterly cash dividend on our outstanding common stock. However, the payment, amount and timing of future cash dividends are subject to the final determination each quarter by our Board of Directors or a committee thereof that there are sufficient funds available to lawfully pay a dividend, that the dividend is compliant with the applicable restrictions in our debt agreements and that the payment of the dividend remains in our and our stockholders’ best interests. The determination will be based on our results of operations, financial condition, cash requirements, debt restrictions and other factors. Given these considerations, we may increase or decrease the amount of the dividend at any time and may also decide to vary the timing of or suspend the payment of dividends in the future. Any decrease or suspension of dividend payments could cause our stock price to decline.

Risks Related to Human Capital and Management

We face risks trying to attract, retain or replace qualified employees to support our operations.

Our success depends to a significant extent upon the continued service of our key senior management, sales and technical personnel, any of whom may be difficult to replace. Competition for qualified employees is intensifying, accelerated by increasing competition in the semiconductor industry for talent to meet strong demand, and our business could be materially and adversely affected by the loss of the services of any of our existing key personnel, including senior management and technical talent, as a result of competition or for any other reason. Labor shortages could also result in higher wages that would increase our labor costs, which could reduce our profits. Although we have entered into agreements with our Chief Executive Officer and certain other executives that would prevent them from working for, or impose financial penalties for doing business with, our competitors in the event that those executives cease working for us, we cannot assure you that we will be successful in our efforts to retain or replace key employees or in hiring and properly training sufficient numbers of qualified personnel and in effectively managing our growth. Our inability to attract, retain, motivate and train qualified new personnel could have a material adverse effect on our business.

Risks Related to Regulatory, Legal and Tax Challenges

We may face warranty claims, product return and liability risks, economic damage claims and negative publicity if our packages fail.

Our packages are incorporated into a number of end products. If our packages fail, our business may be exposed to warranty claims, product return and liability risks, economic damage claims and negative publicity.

We receive warranty claims from our customers from time to time in the ordinary course of our business. If we were to experience an unusually high incidence of warranty claims, we could incur significant costs and our business could be materially and adversely affected. In addition, we are exposed to the product and economic liability risks and the risk of negative publicity affecting our customers. Our sales may decline if any of our customers are sued on a product liability claim. We also may suffer a decline in sales from the negative publicity associated with such a lawsuit or with adverse public perceptions in general regarding our customers’ products. Further, if our packages are delivered with defects, we could incur additional development, repair or replacement costs or suffer other economic losses, and our credibility and the market’s acceptance of our packages could be harmed.

If we fail to maintain an effective system of internal controls, we may not be able to accurately report financial results or prevent fraud.

Our internal controls over financial reporting may not prevent or detect misstatements because of their inherent limitations, including the possibility of human error, the circumvention or overriding of controls, and fraud or corruption. Therefore, even effective internal controls can provide only reasonable assurance with respect to the preparation and fair presentation of financial statements. In addition, projections concerning the effectiveness of internal controls in future

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periods are subject to the risk that our internal controls may become inadequate because of changes in conditions, or that the degree of compliance with our policies or procedures may deteriorate.

We assess our internal controls and systems on an ongoing basis, and from time-to-time, we update and make modifications to our global enterprise resource planning system. We have implemented several significant enterprise resource planning and shop floor management systems and expect to implement additional similar systems in the future. There is a risk that deficiencies may occur that could constitute significant deficiencies or, in the aggregate, a material weakness.

If we fail to remedy any deficiencies or maintain the adequacy of our internal controls, we could be subject to regulatory scrutiny, civil or criminal penalties or shareholder litigation. In addition, failure to maintain adequate internal controls could result in financial statements that do not accurately reflect our operating results or financial condition.

We could suffer adverse tax and other financial consequences if there are changes in tax laws or taxing authorities do not agree with our interpretation of applicable tax laws, including whether we continue to qualify for conditional reduced tax rates, or if we are required to establish or adjust valuation allowances on deferred tax assets.

We earn a substantial portion of our income in foreign countries, and our operations are subject to tax in multiple jurisdictions with complicated and varied tax regimes. Tax laws and income tax rates in these jurisdictions are subject to change due to economic and political conditions. Changes in the tax laws of foreign jurisdictions could arise as a result of the base erosion and profit shifting project that was undertaken by the Organization for Economic Cooperation and Development (“OECD”). The OECD, which represents a coalition of member countries, recommended changes to long-standing tax principles related to transfer pricing and has developed model rules including establishing a global minimum corporate income tax tested on a jurisdictional basis (the “Pillar Two Model Rules”). Some countries we operate in have already started to implement laws based on the Pillar Two Model Rules to be effective in 2024. We do not believe the Pillar Two Model Rules have any material impact to our 2024 results. However, there can be no assurance that our effective tax rate, tax payments or conditional reduced tax rates will not be adversely affected as countries independently amend their tax laws to adopt Pillar Two Model Rules. Changes in U.S. or foreign tax laws, including new or modified guidance with respect to existing tax laws, could have a material adverse impact on our liquidity, results of operations, financial condition and cash flows.

Our tax liabilities are based, in part, on our corporate structure, interpretations of various U.S. and foreign tax laws, including withholding tax, compliance with conditional reduced tax rate requirements, application of changes in tax law to our operations and other relevant laws of applicable taxing jurisdictions. From time to time, taxing authorities may conduct examinations of our income tax returns and other regulatory filings. We cannot assure you that the taxing authorities will agree with our interpretations, including whether we continue to qualify for conditional reduced tax rates. If they do not agree, we may seek to enter into settlements with the taxing authorities. We may also appeal a taxing authority’s determination to the appropriate governmental authorities, but we cannot be sure we will prevail. If we do not prevail or if we enter into settlements with taxing authorities, we may have to make significant payments or otherwise record charges (or reduce tax assets) that materially and adversely affect our results of operations, financial condition and cash flows. Additionally, certain of our subsidiaries operate under conditional reduced tax rates, which will expire in whole or in part at various dates in the future. As those conditional reduced tax rates expire, we expect that our tax expense will increase as income from those jurisdictions becomes subject to higher statutory income tax rates, thereby reducing our liquidity and cash flow.

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 jurisdiction 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. In the event taxable income falls short of current expectations, we may need to establish a valuation allowance against such deferred tax assets that, if required, could materially and adversely affect our results of operations.

Environmental, health and safety liabilities and expenditures could have a material adverse effect on our business, results of operation and financial condition.

Environmental, health and safety laws and regulations in places we do business impose various controls on the use, storage, handling, discharge and disposal of chemicals used or generated in, or emitted by, our production processes, on

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the factories we occupy and on the materials contained in semiconductor products. For example, at our foreign facilities we produce liquid waste when semiconductor wafers are diced into chips with the aid of diamond saws, then cooled with running water. In addition, semiconductor packages have historically utilized metallic alloys containing lead within the interconnect terminals typically referred to as leads, pins or balls. The European Union’s Restriction of Hazardous Substances in Electrical and Electronic Equipment directive and similar laws in other jurisdictions, including China, impose strict restrictions on the placement into the market of electrical and electronic equipment containing lead and certain other hazardous substances. We may become liable under these and other environmental, health and safety laws and regulations, including for the cost of compliance and cleanup of any disposal or release of hazardous materials arising out of our former or current operations, or otherwise as a result of the emission of greenhouse gases (“GHGs”) or other chemicals, the existence of hazardous materials on our properties or the existence of hazardous substances in the products for which we perform our services. We could also be held liable for damages, including fines, penalties and the cost of investigations and remedial actions, and we could be subject to revocation of permits, which may materially and adversely affect our ability to maintain or expand our operations. Additionally, if Amkor is unable to align its environmental, health and safety practices with shifting customer preferences, we could suffer reputational harm, which could have a material and adverse effect on our business, results of operations, liquidity and cash flows.

There has also been an increase in regulatory and public attention and industry and customer focus on the materials contained in semiconductor products, the environmental impact of semiconductor operations and the risk of chemical releases from such operations, climate change, sustainability and related environmental concerns. Increased regulation of and restriction on the use of hazardous substances may impact our supply chain due to decreased availability, necessitate changes in our packaging processes, require us to seek substitutes that may not be readily available in the marketplace or eliminate the use of such hazardous substances although there may not be a technically feasible alternative. This increased focus on sustainability and the environmental impact of semiconductor operations and products has caused industry groups and customers to impose additional requirements on us and our suppliers, sometimes exceeding regulatory standards. These industry and customer requirements include increased tracking and reporting of GHG emissions, reductions in waste and wastewater from operations, additional reporting on the materials and components used in the products for which we perform our services, and the use of renewable energy sources in our factory operations. In addition, recent and ongoing changes to climate change regulation could increase our compliance costs, including as a result of carbon pricing impacts on electrical utilities as well as increased indirect costs resulting from our customers, suppliers, and other stakeholders incurring additional compliance costs that are passed on to us. We have started to incur compliance costs within our existing manufacturing infrastructure, and such costs may increase as we expand our manufacturing capacity. To comply with these additional requirements, we may need to procure additional, or increase the use of, renewable energy, procure additional equipment or make factory or process changes, which could result in increased operating costs.

General Risk Factors

The Covid-19 pandemic impacted, and may impact in the future, the supply chain and consumer demand for our customers’ products and services, and such impact on the supply chain and consumer demand may ultimately have a material and adverse effect on our business, results of operations and financial condition.

The impacts of the Covid-19 pandemic varied by location, by industry and by end market. We, our suppliers and our customers were disrupted by worker illness and absenteeism, quarantines and restrictions on employees’ ability to work, office and factory closures, disruptions to ports and other shipping infrastructure and border closures or other travel or health-related restrictions. Restrictions on our workforce or access to our manufacturing facilities, or similar limitations for our suppliers, or restrictions or disruptions of transportation in order to contain the spread of Covid-19 caused disruptions to our supply chain in connection with the sourcing of equipment, supplies and other materials, and similar restrictions in the future could limit our capacity to meet customer demand and have a material adverse effect on our business, results of operations and financial condition. Restrictions may be implemented in response to the emergence of

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new variants or re-emergence of Covid-19, and such restrictions may materially and adversely impact our operations and the operations of our customers and suppliers.

Our business and financial condition has been adversely affected, and could be adversely affected in the future, by natural disasters and other calamities, health conditions or pandemics, political instability, hostilities or other disruptions.

We have significant packaging and test services and other operations in China, Japan, Korea, Malaysia, the Philippines, Portugal, Singapore, Taiwan and the Vietnam Facility. Such operations are or could be subject to: natural disasters, such as earthquakes, tsunamis, typhoons, floods, droughts, volcanoes and other severe weather and geological events, and other calamities, such as fire; the outbreak of infectious diseases (such as Covid-19 and other coronaviruses, Ebola or flu); industrial strikes; government-imposed travel restrictions or quarantines; breakdowns of equipment; difficulties or delays in obtaining materials, equipment, utilities and services; political events or instability; acts of war or armed conflict (such as ongoing conflicts in Ukraine and Israel); terrorist incidents and other hostilities in regions where we have facilities; and industrial accidents and other events, that could disrupt or even shut down our operations. While our global manufacturing footprint allows us to shift production to other factories without substantial cost or production delays, certain of our services are currently performed using equipment located in one or only a subset of our factories. A major disruption or shutdown of any such factory could completely impair our ability to perform those services or require us to shift them to another location. As a result, our ability to fulfill customer orders may be impaired or delayed, and we could incur significant losses.

For example, in April 2016, our Kumamoto factory was damaged by earthquakes in Japan. As a result of these earthquakes, our sales were reduced due to the temporary disruption in operations, and we incurred earthquake-related costs for damaged inventory, buildings and equipment. Our suppliers and customers also have significant operations in such locations, and this could compound the effect of any such disruption. In the event of such a disruption or shutdown, we may be unable to reallocate production to other facilities in a timely or cost-effective manner (if at all), and we may not have sufficient capacity, or customer approval, to service customer demands in our other facilities. A natural disaster or other calamity, political instability, the occurrence of hostilities or other event that results in a prolonged disruption to our operations, or the operations of our customers or suppliers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.

In addition, some of the processes that we utilize in our operations place us at risk of fire and other damage. For example, highly flammable gases are used in the preparation of wafers holding semiconductor devices for flip chip packaging.

We maintain insurance policies for various types of property, casualty and other risks, but we do not carry insurance for all the above referred risks. With regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be materially and adversely affected by natural disasters and other calamities.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Repurchase of Equity Securities

The following table provides information regarding repurchases of our common stock during the three months ended March 31, 2024.


Period	Total Number of Shares Purchased (a)	Average Price Paid Per Share ($)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (b)	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($) (b)
January 1 - January 31	—	$	—	—	$	—
February 1 - February 29	60,710	30.01		—	—
March 1 - March 31	2	31.03		—	—
Total	60,712	$	30.01	—

(a)Represents shares of common stock surrendered to us to satisfy tax withholding obligations associated with the shares issued to employees in connection with share-based compensation.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

During the three months ended March 31, 2024, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as such terms are defined in paragraphs (a) and (c), respectively, of Item 408 of Regulation S-K promulgated under the Securities Act of 1933, as amended.

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Certification of Guillaume Marie Jean Rutten, Chief Executive Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended

Item 6. Exhibits

Incorporated by Reference

Included Herewith

Exhibit Number

Exhibit Description

Form

Period Ending

Exhibit

Filing Date

31.1

31.2

Certification of Megan Faust, Chief Financial Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended

Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002*

101.INS

Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document

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Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

*Furnished herewith.

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Revenue from Contract with Customer [Abstract]

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

AMKOR TECHNOLOGY, INC.



			By:			/s/ Megan Faust
						Megan Faust
						Executive Vice President,
						Chief Financial Officer and Treasurer
						(Principal Financial Officer and Principal Accounting Officer)

Date: May 1, 2024

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EX-31.1 2 amkr3312024ex311.htm EX-31.1 Document

Exhibit 31.1

SECTION 302 CERTIFICATION

I, Guillaume Marie Jean Rutten, certify that:

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 control over financial reporting.


			/s/ Guillaume Marie Jean Rutten
			Guillaume Marie Jean Rutten
			President and Chief Executive Officer

May 1, 2024

EX-31.2 3 amkr3312024ex312.htm EX-31.2 Document

Exhibit 31.2

SECTION 302 CERTIFICATION

I, Megan Faust, certify that:

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

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


			/s/ Megan Faust
			Megan Faust
			Executive Vice President,
			Chief Financial Officer and Treasurer

May 1, 2024

EX-32 4 amkr3312024ex32.htm EX-32 Document

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

For purposes of Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Amkor Technology, Inc., a Delaware corporation (the “Company”), does hereby certify, to such officer’s knowledge, that the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2024 (the “Form 10-Q”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)) and that the information contained in the Form 10-Q fairly presents in all material respects the financial condition and results of operations of the Company.


/s/ Guillaume Marie Jean Rutten
By:			Guillaume Marie Jean Rutten
Title:			President and Chief Executive Officer
Date:			May 1, 2024


/s/ Megan Faust
By:			Megan Faust
Title:			Executive Vice President,
			Chief Financial Officer and Treasurer
Date:			May 1, 2024

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Short-term investments, Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] $600.0 million senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) Senior Secured Revolving Credit Facility due March 2027 [Member] Senior Secured Revolving Credit Facility due March 2027 Contract liabilities Contract with Customer, Liability Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cost of sales Cost of Goods and Services Sold Service cost Defined Benefit Plan, Service Cost Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period 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Amount Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Share-based awards (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award Type [Axis] Award Type Award Type [Axis] Derivative Instruments and Hedging Activities Disclosure [Abstract] Document Quarterly Report Document Quarterly Report Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Interest expense Interest Expense Property, plant and equipment included in capital expenditures payable Capital Expenditures Incurred but Not yet Paid Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total property, plant and equipment Property, Plant and Equipment, Gross Right of use assets acquired through operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Trading Arrangement: Trading Arrangement [Axis] Use of Estimates Use of Estimates, Policy [Policy Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number TIBOR Tokyo Interbank Offered Rate (TIBOR) [Member] Tokyo Interbank Offered Rate (TIBOR) [Member] Short-term operating lease liability Operating Lease, Liability, Current Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Entity Shell Company Entity Shell Company Singapore dollar Singapore, Dollars Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Recently Issued Standards New Accounting 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customer advances Contract with Customer, Liability, Current Treasury stock, at cost, 46,340 and 46,279 shares in 2.024 and 2023, respectively Treasury Stock, Common, Value Security Exchange Name Security Exchange Name Selling, general and administrative Selling, General and Administrative Expense Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Award vesting rights, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Employee Stock Option Employee Stock Option [Member] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Pension and severance obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Other financing activities Proceeds from (Payments for) Other Financing Activities Maximum Maximum [Member] Comprehensive income attributable to Amkor Comprehensive Income (Loss), Net of Tax, Attributable to Parent Cash equivalents, Amortized Cost Cash Equivalents, at Carrying Value Document Type Document Type Tabular List, Table Tabular List [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Basis of Presentation Basis of Accounting, Policy [Policy Text Block] EX-101.PRE 9 amkr-20240331_pre.xml INLINE XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT XML 11 R1.htm IDEA: XBRL DOCUMENT

COVER PAGE - shares	3 Months Ended
COVER PAGE - shares	Mar. 31, 2024	Apr. 25, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		246,170,251
Entity Central Index Key	0001047127
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML 12 R2.htm IDEA: XBRL DOCUMENT

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net sales	$ 1,365,511	$ 1,471,539
Cost of sales	1,163,868	1,277,118
Gross profit	201,643	194,421
Selling, general and administrative	90,346	78,671
Research and development	38,171	47,047
Total operating expenses	128,517	125,718
Operating income	73,126	68,703
Interest expense	16,439	16,167
Other (income) expense, net	(15,295)	(3,552)
Total other expense, net	1,144	12,615
Income before taxes	71,982	56,088
Income tax expense	12,196	10,864
Net income	59,786	45,224
Net (income) loss attributable to non-controlling interests	(889)	127
Net income attributable to Amkor	$ 58,897	$ 45,351
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.24	$ 0.18
Diluted (in dollars per share)	$ 0.24	$ 0.18
Shares used in computing per common share amounts:
Basic (in shares)	246,008	245,330
Diluted (in shares)	247,614	247,087

XML 13 R3.htm IDEA: XBRL DOCUMENT

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 59,786	$ 45,224
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(308)	601
Adjustments to unrealized components of defined benefit pension plans	(85)	(97)
Foreign currency translation	(9,047)	(2,113)
Total other comprehensive income (loss)	(9,440)	(1,609)
Comprehensive income	50,346	43,615
Comprehensive (income) loss attributable to non-controlling interests	(889)	127
Comprehensive income attributable to Amkor	$ 49,457	$ 43,742

XML 14 R4.htm IDEA: XBRL DOCUMENT

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 1,118,004	$ 1,119,818
Short-term investments (amortized cost of $454,767 and $474,663 in 2.024 and 2023, respectively)	454,669	474,869
Accounts receivable, net of allowances	1,093,960	1,149,493
Inventories	331,070	393,128
Other current assets	47,312	58,502
Total current assets	3,045,015	3,195,810
Property, plant and equipment, net	3,367,434	3,299,445
Operating lease right of use assets	106,873	117,006
Goodwill	18,641	20,003
Restricted cash	781	799
Other assets	146,322	138,062
Total assets	6,685,066	6,771,125
Current liabilities:
Short-term borrowings and current portion of long-term debt	112,968	131,624
Trade accounts payable	618,378	754,453
Capital expenditures payable	234,762	106,368
Short-term operating lease liability	27,112	33,616
Accrued expenses	309,976	358,414
Total current liabilities	1,303,196	1,384,475
Long-term debt	1,038,346	1,071,832
Pension and severance obligations	79,647	87,133
Long-term operating lease liabilities	52,924	56,837
Other non-current liabilities	180,345	175,813
Total liabilities	2,654,458	2,776,090
Commitments and contingencies (Note 15)
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; 292,494 and 292,167 shares issued; and 246,154 and 245,888 shares outstanding in 2.024 and 2023, respectively	292	292
Additional paid-in capital	2,014,782	2,008,170
Retained earnings	2,199,300	2,159,831
Accumulated other comprehensive income (loss)	6,910	16,350
Treasury stock, at cost, 46,340 and 46,279 shares in 2.024 and 2023, respectively	(224,157)	(222,335)
Total Amkor stockholders’ equity	3,997,127	3,962,308
Non-controlling interests in subsidiaries	33,481	32,727
Total equity	4,030,608	3,995,035
Total liabilities and equity	$ 6,685,066	$ 6,771,125

XML 15 R5.htm IDEA: XBRL DOCUMENT

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Short term investments amortized cost	$ 454,767	$ 474,663
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)	292,494,000	292,167,000
Common stock, shares outstanding (in shares)	246,154,000	245,888,000
Treasury stock, shares (in shares)	46,340,000	46,279,000

XML 16 R6.htm IDEA: XBRL DOCUMENT

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - 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, 2022			291,249
Balance at beginning 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 beginning of period, treasury stock (in shares) at Mar. 31, 2023							(46,269)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,224	45,351			45,351			(127)
Other comprehensive income (loss)	(1,609)	(1,609)				(1,609)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(111)
Treasury stock acquired through surrender of shares for tax withholding	(2,823)	(2,823)					$ (2,823)
Issuance of stock through share-based compensation plans (in shares)			565
Issuance of stock through share-based compensation plans	1,524	1,524	$ 1	1,523
Share-based compensation	3,708	3,708		3,708
Cash Dividends declared	(18,426)	(18,426)			(18,426)
Subsidiary dividends to non-controlling interests	(136)							(136)
Balance at end of period, common stock (in shares) at Mar. 31, 2023			291,814
Balance at end of period at Mar. 31, 2023	$ 3,727,163	3,696,477	$ 292	2,001,575	1,901,569	15,090	$ (222,049)	30,686
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022							(46,158)
Balance at beginning of period, common stock (in shares) at Dec. 31, 2023	245,888		292,167
Balance at beginning 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 beginning of period, treasury stock (in shares) at Mar. 31, 2024	(46,340)						(46,340)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 59,786	58,897			58,897			889
Other comprehensive income (loss)	(9,440)	(9,440)				(9,440)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(61)
Treasury stock acquired through surrender of shares for tax withholding	(1,822)	(1,822)					$ (1,822)
Issuance of stock through share-based compensation plans (in shares)			327
Issuance of stock through share-based compensation plans	1,356	1,356		1,356
Share-based compensation	5,256	5,256		5,256
Cash Dividends declared	(19,428)	(19,428)			(19,428)
Subsidiary dividends to non-controlling interests	$ (135)							(135)
Balance at end of period, common stock (in shares) at Mar. 31, 2024	246,154		292,494
Balance at end of period at Mar. 31, 2024	$ 4,030,608	$ 3,997,127	$ 292	$ 2,014,782	$ 2,199,300	$ 6,910	$ (224,157)	$ 33,481
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023	(46,279)						(46,279)

XML 17 R7.htm IDEA: XBRL DOCUMENT

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.07875	$ 0.075

XML 18 R8.htm IDEA: XBRL DOCUMENT

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 59,786	$ 45,224
Depreciation and amortization	144,925	156,762
Other operating activities and non-cash items	14,100	(2,821)
Changes in assets and liabilities	(56,499)	(23,419)
Net cash provided by operating activities	162,312	175,746
Cash flows from investing activities:
Payments for property, plant and equipment	(96,169)	(98,224)
Proceeds from sale of property, plant and equipment	3,439	652
Proceeds from foreign exchange forward contracts	740	20,267
Payments for foreign exchange forward contracts	(24,596)	(20,358)
Payments for short-term investments	(111,760)	(172,409)
Proceeds from sale of short-term investments	16,014	21,549
Proceeds from maturities of short-term investments	121,684	92,655
Other investing activities	4,545	164
Net cash used in investing activities	(86,103)	(155,704)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	370,000
Payments of revolving credit facilities	0	(370,000)
Proceeds from short-term debt	5,012	11,042
Payments of short-term debt	(5,669)	(5,840)
Payments of long-term debt	(29,100)	(35,980)
Payments of finance lease obligations	(19,684)	(15,148)
Payments of dividends	(19,383)	(18,430)
Other financing activities	(1,053)	(1,850)
Net cash used in financing activities	(69,877)	(66,206)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(8,164)	(2,943)
Net decrease in cash, cash equivalents and restricted cash	(1,832)	(49,107)
Cash, cash equivalents and restricted cash, beginning of period	1,120,617	962,406
Cash, cash equivalents and restricted cash, end of period	1,118,785	913,299
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	195,405	177,615
Right of use assets acquired through finance lease liabilities	17,811	17,513
Right of use assets acquired through operating lease liabilities	$ 2,321	$ 3,180

XML 19 R9.htm IDEA: XBRL DOCUMENT

Interim Financial Statements	3 Months Ended
Interim Financial Statements	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Financial Statements	Interim Financial Statements Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2024, and for the three months ended March 31, 2024 and 2023, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2023 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2023 Form 10-K. The results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full year ending December 31, 2024. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries. Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment. Leases. Total long-term finance lease liabilities as of March 31, 2024 and December 31, 2023 were $49.7 million and $47.8 million, respectively. Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation. Unbilled Receivables. Total unbilled receivables as of March 31, 2024 and December 31, 2023 were $229.8 million and $260.8 million, respectively. Contract Liabilities. Contract liabilities were $123.6 million and $135.5 million as of March 31, 2024 and December 31, 2023, respectively. As of March 31, 2024 and December 31, 2023, the short-term portions of the liabilities were $67.4 million and $71.1 million, respectively. The remainder of the March 31, 2024 contract liability balance is expected to be recognized in revenue over the next 1-5 years. Revenue recognized during the three months ended March 31, 2024 and 2023 that was included in the contract liabilities balance at the beginning of the period was $18.9 million and $21.5 million, respectively. Share-based compensation. In February 2024, long-term incentive awards were granted in the form of time-vested restricted stock units (“RSUs”) and performance-vested restricted stock units (“PSUs”) to our management pursuant to the 2021 Equity Plan with different terms from those issued in prior years. For a description of the RSUs and PSUs granted in prior years, please refer to our Consolidated Financial Statements in Part II, Item 8, Note 2 of the 2023 Form 10-K. The RSUs granted in the first quarter of 2024 will generally vest in three equal installments on the anniversary of the grant date, subject to the recipient’s continued employment with the Company at the time of vesting. 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. The PSUs granted in the first quarter of 2024 are 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”), 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. For the EPS PSUs, the value 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. The number of shares of our common stock to be received annually at vesting will range from 0% to 225%. For the rTSR PSUs, the Company estimated the grant-date fair value of the PSUs subject to a market condition 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%. The grant date fair value of the PSUs was $27.07. 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. The Company recognizes the grant date fair value of the PSUs as compensation expense ratably over the vesting period. 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. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.

XML 20 R10.htm IDEA: XBRL DOCUMENT

Net Sales by Product Group and End Market

3 Months Ended

Mar. 31, 2024

Net Sales by Product Group and End Market

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Advanced products (1)	$	1,069,709	$	1,067,377
Mainstream products (2)	295,802		404,162
Total net sales	$	1,365,511	$	1,471,539

(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 Three Months Ended March 31,
	2024		2023
Communications (smartphones, tablets)	47	%	45	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	22	%	26	%
Computing (data center, infrastructure, PC/laptop, storage)	17	%	17	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	12	%
Total net sales	100	%	100	%

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

Other Income and Expenses [Abstract]

XML 21 R11.htm IDEA: XBRL DOCUMENT

Other Income and Expense

3 Months Ended

Mar. 31, 2024

Other Income and Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Interest income	$	(16,796)	$	(10,433)
Foreign currency loss (gain), net	1,545		6,763



Other, net	(44)		118
Total other (income) expense, net	$	(15,295)	$	(3,552)

XML 22 R12.htm IDEA: XBRL DOCUMENT

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense of $12.2 million for the three months ended March 31, 2024 reflects income taxes, foreign withholding taxes and minimum taxes. 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. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized. Unrecognized tax benefits represent reserves for potential tax deficiencies or reductions in tax benefits that could result from federal, state or foreign tax audits. Gross unrecognized tax benefits decreased from $31.5 million as of December 31, 2023 to $30.6 million as of March 31, 2024. All of our unrecognized tax benefits would reduce our effective tax rate if recognized. Our unrecognized tax benefits are subject to change for effective settlement of examinations, changes in the recognition threshold of tax positions, the expiration of statutes of limitations and other factors. We have tax returns that are open to examination in various jurisdictions for tax years 2013-2023. 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 the examinations will be favorable. 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.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

Accumulated Other Comprehensive Income (Loss)

XML 23 R13.htm IDEA: XBRL DOCUMENT

Earnings Per Share

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Earnings Per Share

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


	For the Three Months Ended March 31,
	2024		2023
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	58,897	$	45,351




Weighted-average number of common shares outstanding - basic	246,008		245,330
Effect of dilutive securities:
Share-based awards	1,606		1,757
Weighted-average number of common shares outstanding - diluted	247,614		247,087
Net income attributable to Amkor per common share:
Basic	$	0.24	$	0.18
Diluted	0.24		0.18

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 Three Months Ended March 31,
	2024	2023
	(In thousands)
Share-based awards	11	—

XML 24 R14.htm IDEA: XBRL DOCUMENT

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2023	$	212	$	15,905	$	233	$	16,350
Other comprehensive income (loss) before reclassifications	(253)		—		(9,047)		(9,300)
Amounts reclassified from accumulated other comprehensive income (loss)	(55)		(85)		—		(140)
Other comprehensive income (loss)	(308)		(85)		(9,047)		(9,440)
Accumulated other comprehensive income (loss) at March 31, 2024	$	(96)	$	15,820	$	(8,814)	$	6,910


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2022	$	(1,573)	$	14,220	$	4,052	$	16,699
Other comprehensive income (loss) before reclassifications	645		—		(2,113)		(1,468)
Amounts reclassified from accumulated other comprehensive income (loss)	(44)		(97)		—		(141)
Other comprehensive income (loss)	601		(97)		(2,113)		(1,609)
Accumulated other comprehensive income (loss) at March 31, 2023	$	(972)	$	14,123	$	1,939	$	15,090

(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).

The entire disclosure for equity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481004/946-505-50-6

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-18

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-18

Investments, Debt and Equity Securities [Abstract]

XML 25 R15.htm IDEA: XBRL DOCUMENT

Investments

3 Months Ended

Mar. 31, 2024

Investments

All of our available-for-sale debt investments as of March 31, 2024 are available to fund current operations and are recorded at fair value (Note 14).

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


	March 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	$	51,970	$	—	$	—	$	51,970	$	—	$	51,970
Corporate bonds	1,657		—		—		1,657		—		1,657

Money market funds	97,440		—		—		97,440		97,440		—



U.S. government bonds	16,936		—		—		16,936		16,936		—

Total cash equivalents (2)	168,003		—		—		168,003		114,376		53,627

Short-term investments
Asset-backed securities	62,076		99		(27)		62,148		—		62,148
Certificate of deposits	19,294		—		—		19,294		19,294		—
Commercial paper	45,383		—		—		45,383		—		45,383
Corporate bonds	255,876		277		(301)		255,852		—		255,852



U.S. government agency bonds	4,729		—		(4)		4,725		—		4,725
U.S. government bonds	62,212		—		(142)		62,070		62,070		—

Total short-term investments	449,570		376		(474)		449,472		81,364		368,108
Total	$	617,573	$	376	$	(474)	$	617,475	$	195,740	$	421,735


	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		—



U.S. government bonds	2,996		—		—		2,996		2,996		—
Total cash equivalents	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

(2)For three months ended March 31, 2024 and 2023, we sold cash equivalent investments for proceeds of $5.8 million and $13.0 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 March 31, 2024:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	459,067	$	458,887
After 1 year through 5 years	96,430		96,440


Asset-backed securities	62,076		62,148
Total	$	617,573	$	617,475

Actual maturities can differ from contractual maturities due to various factors including the issuers may have the right to call or prepay obligations without call or prepayment penalties.

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

XML 26 R16.htm IDEA: XBRL DOCUMENT

Factoring of Accounts Receivable	3 Months Ended
Factoring of Accounts Receivable	Mar. 31, 2024
Factoring of Accounts Receivable [Abstract]
Factoring of Accounts Receivable	Factoring of Accounts Receivable For 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 three months ended March 31, 2024 and 2023, we sold receivables totaling $24.4 million and $78.0 million, respectively, net of discounts and fees. Discounts and fees were insignificant for the three months ended March 31, 2024, and $0.2 million for the three months ended March 31, 2023.

XML 27 R17.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2024

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Land	$	211,211	$	212,722
Buildings and improvements	2,149,095		2,080,589
Machinery and equipment	7,104,414		7,022,614
Finance lease assets	224,983		209,506
Furniture, fixtures and other equipment	22,460		22,655
Software and computer equipment	206,633		200,362
Construction in progress	198,263		223,332
Total property, plant and equipment	10,117,059		9,971,780
Accumulated depreciation and amortization	(6,749,625)		(6,672,335)
Total property, plant and equipment, net	$	3,367,434	$	3,299,445

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Depreciation expense	$	144,787	$	156,614

XML 28 R18.htm IDEA: XBRL DOCUMENT

Accrued Expenses

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Payroll and benefits	$	95,100	$	115,604

Deferred revenue and customer advances	67,439		71,117
Short-term finance lease liabilities	52,734		57,761
Income taxes payable	30,471		35,215
Accrued severance plan obligations	7,518		7,906
Accrued interest	2,318		11,175
Other accrued expenses	54,396		59,636
Total accrued expenses	$	309,976	$	358,414

XML 29 R19.htm IDEA: XBRL DOCUMENT

Debt

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Debt

Following is a summary of short-term borrowings and long-term debt:


	March 31, 2024		December 31, 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 1.85%, due April 2024 (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)	4,136		5,098
Term loan, fixed rate at 1.35%, due December 2024	28,246		40,414
Term loan, fixed rate at 1.20%, due December 2025	25,206		30,913
Term loan, fixed rate at 1.23%, due December 2026	47,605		55,729
Term loan, fixed rate at 1.59%, due December 2027	77,800		89,053
Term loan, fixed rate at 1.80%, due December 2028	109,845		124,078
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due June 2025	37,000		37,000
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due 2025	57,000		57,500
Term loans, SOFR plus 0.95%, due December 2026 (3)	45,000		45,000
Other:
Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (4)	—		—
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)	—		—
	1,156,838		1,209,785
Less: Unamortized discount and deferred debt costs, net	(5,524)		(6,329)
Less: Short-term borrowings and current portion of long-term debt	(112,968)		(131,624)
Long-term debt	$	1,038,346	$	1,071,832

We were in compliance with all debt covenants at March 31, 2024.

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.

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XML 30 R20.htm IDEA: XBRL DOCUMENT

Pension Plans

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Pension Plans

Foreign Defined Benefit Pension Plans


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Service cost	$	3,484	$	3,828
Interest cost	1,459		1,603
Expected return on plan assets	(1,418)		(1,311)

Recognized actuarial gain	(97)		(98)
Net periodic pension cost	$	3,428	$	4,022

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.

Defined Contribution Pension Plans

We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Defined contribution expense	$	8,414	$	8,796

The entire disclosure for retirement benefits.

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Derivative Instruments and Hedging Activities Disclosure [Abstract]

XML 31 R21.htm IDEA: XBRL DOCUMENT

Derivatives

3 Months Ended

Mar. 31, 2024

Derivatives

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


	March 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)
Japanese yen	$	235,397	$	457	Other current assets	$	279,027	$	2,745	Other current assets
Korean won	76,415		(11)		Accrued expenses	59,036		(97)		Accrued expenses
Philippine peso	9,009		(12)		Accrued expenses	6,553		(20)		Accrued expenses
Singapore dollar	14,741		(50)		Accrued expenses	11,506		20		Other current assets
Taiwan dollar	38,850		28		Other current assets	37,914		89		Other current assets
Total forward contracts	$	374,412	$	412		$	394,036	$	2,737

XML 32 R22.htm IDEA: XBRL DOCUMENT

Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

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:


	March 31, 2024				December 31, 2023
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	528,008	$	522,028	$	531,778	$	521,839
Revolving credit facilities and term loans (Level 2)	615,973		629,286		666,316		681,617
Total debt	$	1,143,981	$	1,151,314	$	1,198,094	$	1,203,456

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.

XML 33 R23.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 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 determine 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. In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. 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. Lease Commitments As of March 31, 2024 we have entered into additional lease agreements that have not yet commenced of approximately $58 million.

XML 34 R24.htm IDEA: XBRL DOCUMENT

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 58,897	$ 45,351

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

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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 34: 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 35: 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 36: 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 37: 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 38: 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(20))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 39: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

XML 35 R25.htm IDEA: XBRL DOCUMENT

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 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

XML 36 R26.htm IDEA: XBRL DOCUMENT

Interim Financial Statements (Policies)	3 Months Ended
Interim Financial Statements (Policies)	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2024, and for the three months ended March 31, 2024 and 2023, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2023 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2023 Form 10-K. The results of operations for the three months ended March 31, 2024 are not necessarily indicative of the results to be expected for the full year ending December 31, 2024. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries.
Use of Estimates	Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment.
Goodwill	Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.
Recently Issued Standards	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. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.
Income Taxes	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. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized.
Commitments and Contingencies	In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. 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.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

Revenue from Contract with Customer [Abstract]

XML 37 R27.htm IDEA: XBRL DOCUMENT

Net Sales by Product Group and End Market (Tables)

3 Months Ended

Mar. 31, 2024

Schedule of net sales by product group

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Advanced products (1)	$	1,069,709	$	1,067,377
Mainstream products (2)	295,802		404,162
Total net sales	$	1,365,511	$	1,471,539

(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 Three Months Ended March 31,
	2024		2023
Communications (smartphones, tablets)	47	%	45	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	22	%	26	%
Computing (data center, infrastructure, PC/laptop, storage)	17	%	17	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	12	%
Total net sales	100	%	100	%

XML 38 R28.htm IDEA: XBRL DOCUMENT

Other Income and Expense (Tables)

3 Months Ended

Mar. 31, 2024

Other Income and Expenses [Abstract]

Schedule of other (income) expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Interest income	$	(16,796)	$	(10,433)
Foreign currency loss (gain), net	1,545		6,763



Other, net	(44)		118
Total other (income) expense, net	$	(15,295)	$	(3,552)

XML 39 R29.htm IDEA: XBRL DOCUMENT

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

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


	For the Three Months Ended March 31,
	2024		2023
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	58,897	$	45,351




Weighted-average number of common shares outstanding - basic	246,008		245,330
Effect of dilutive securities:
Share-based awards	1,606		1,757
Weighted-average number of common shares outstanding - diluted	247,614		247,087
Net income attributable to Amkor per common share:
Basic	$	0.24	$	0.18
Diluted	0.24		0.18

Schedule of potential shares of common stock 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 Three Months Ended March 31,
	2024	2023
	(In thousands)
Share-based awards	11	—

XML 40 R30.htm IDEA: XBRL DOCUMENT

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Schedule of changes in accumulated other comprehensive income (loss), net of tax

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2023	$	212	$	15,905	$	233	$	16,350
Other comprehensive income (loss) before reclassifications	(253)		—		(9,047)		(9,300)
Amounts reclassified from accumulated other comprehensive income (loss)	(55)		(85)		—		(140)
Other comprehensive income (loss)	(308)		(85)		(9,047)		(9,440)
Accumulated other comprehensive income (loss) at March 31, 2024	$	(96)	$	15,820	$	(8,814)	$	6,910


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2022	$	(1,573)	$	14,220	$	4,052	$	16,699
Other comprehensive income (loss) before reclassifications	645		—		(2,113)		(1,468)
Amounts reclassified from accumulated other comprehensive income (loss)	(44)		(97)		—		(141)
Other comprehensive income (loss)	601		(97)		(2,113)		(1,609)
Accumulated other comprehensive income (loss) at March 31, 2023	$	(972)	$	14,123	$	1,939	$	15,090

(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).

XML 41 R31.htm IDEA: XBRL DOCUMENT

Investments (Tables)

3 Months Ended

Mar. 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:


	March 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	$	51,970	$	—	$	—	$	51,970	$	—	$	51,970
Corporate bonds	1,657		—		—		1,657		—		1,657

Money market funds	97,440		—		—		97,440		97,440		—



U.S. government bonds	16,936		—		—		16,936		16,936		—

Total cash equivalents (2)	168,003		—		—		168,003		114,376		53,627

Short-term investments
Asset-backed securities	62,076		99		(27)		62,148		—		62,148
Certificate of deposits	19,294		—		—		19,294		19,294		—
Commercial paper	45,383		—		—		45,383		—		45,383
Corporate bonds	255,876		277		(301)		255,852		—		255,852



U.S. government agency bonds	4,729		—		(4)		4,725		—		4,725
U.S. government bonds	62,212		—		(142)		62,070		62,070		—

Total short-term investments	449,570		376		(474)		449,472		81,364		368,108
Total	$	617,573	$	376	$	(474)	$	617,475	$	195,740	$	421,735


	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		—



U.S. government bonds	2,996		—		—		2,996		2,996		—
Total cash equivalents	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

(2)For three months ended March 31, 2024 and 2023, we sold cash equivalent investments for proceeds of $5.8 million and $13.0 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 March 31, 2024:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	459,067	$	458,887
After 1 year through 5 years	96,430		96,440


Asset-backed securities	62,076		62,148
Total	$	617,573	$	617,475

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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-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
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-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
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-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
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-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

Property, Plant and Equipment [Abstract]

XML 42 R32.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2024

Schedule of property, plant and equipment and depreciation expense

Property, plant and equipment consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Land	$	211,211	$	212,722
Buildings and improvements	2,149,095		2,080,589
Machinery and equipment	7,104,414		7,022,614
Finance lease assets	224,983		209,506
Furniture, fixtures and other equipment	22,460		22,655
Software and computer equipment	206,633		200,362
Construction in progress	198,263		223,332
Total property, plant and equipment	10,117,059		9,971,780
Accumulated depreciation and amortization	(6,749,625)		(6,672,335)
Total property, plant and equipment, net	$	3,367,434	$	3,299,445

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Depreciation expense	$	144,787	$	156,614

XML 43 R33.htm IDEA: XBRL DOCUMENT

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Schedule of accrued expenses

Accrued expenses consist of the following:


	March 31, 2024		December 31, 2023
	(In thousands)
Payroll and benefits	$	95,100	$	115,604

Deferred revenue and customer advances	67,439		71,117
Short-term finance lease liabilities	52,734		57,761
Income taxes payable	30,471		35,215
Accrued severance plan obligations	7,518		7,906
Accrued interest	2,318		11,175
Other accrued expenses	54,396		59,636
Total accrued expenses	$	309,976	$	358,414

XML 44 R34.htm IDEA: XBRL DOCUMENT

Debt (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of short-term borrowings and long-term debt

Following is a summary of short-term borrowings and long-term debt:


	March 31, 2024		December 31, 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 1.85%, due April 2024 (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)	4,136		5,098
Term loan, fixed rate at 1.35%, due December 2024	28,246		40,414
Term loan, fixed rate at 1.20%, due December 2025	25,206		30,913
Term loan, fixed rate at 1.23%, due December 2026	47,605		55,729
Term loan, fixed rate at 1.59%, due December 2027	77,800		89,053
Term loan, fixed rate at 1.80%, due December 2028	109,845		124,078
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due June 2025	37,000		37,000
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of March 31, 2024, due 2025	57,000		57,500
Term loans, SOFR plus 0.95%, due December 2026 (3)	45,000		45,000
Other:
Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (4)	—		—
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)	—		—
	1,156,838		1,209,785
Less: Unamortized discount and deferred debt costs, net	(5,524)		(6,329)
Less: Short-term borrowings and current portion of long-term debt	(112,968)		(131,624)
Long-term debt	$	1,038,346	$	1,071,832

XML 45 R35.htm IDEA: XBRL DOCUMENT

Pension Plans (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Schedule of components of net periodic pension cost

The components of net periodic pension cost for these defined benefit pension plans are as follows:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Service cost	$	3,484	$	3,828
Interest cost	1,459		1,603
Expected return on plan assets	(1,418)		(1,311)

Recognized actuarial gain	(97)		(98)
Net periodic pension cost	$	3,428	$	4,022

Schedule of defined contribution expense

The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2024		2023
	(In thousands)
Defined contribution expense	$	8,414	$	8,796

XML 46 R36.htm IDEA: XBRL DOCUMENT

Derivatives (Tables)

3 Months Ended

Mar. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of air value of derivative instruments in statement of financial position

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


	March 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)
Japanese yen	$	235,397	$	457	Other current assets	$	279,027	$	2,745	Other current assets
Korean won	76,415		(11)		Accrued expenses	59,036		(97)		Accrued expenses
Philippine peso	9,009		(12)		Accrued expenses	6,553		(20)		Accrued expenses
Singapore dollar	14,741		(50)		Accrued expenses	11,506		20		Other current assets
Taiwan dollar	38,850		28		Other current assets	37,914		89		Other current assets
Total forward contracts	$	374,412	$	412		$	394,036	$	2,737

XML 47 R37.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Tables)

3 Months Ended

Mar. 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:


	March 31, 2024				December 31, 2023
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	528,008	$	522,028	$	531,778	$	521,839
Revolving credit facilities and term loans (Level 2)	615,973		629,286		666,316		681,617
Total debt	$	1,143,981	$	1,151,314	$	1,198,094	$	1,203,456

XML 48 R38.htm IDEA: XBRL DOCUMENT

Interim Financial Statements (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) installment $ / shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Long-term finance lease liabilities	$ 49,700		$ 47,800
Unbilled receivables	229,800		260,800
Contract liabilities	123,600		135,500
Deferred revenue and customer advances	67,439		$ 71,117
Revenue recognized	$ 18,900	$ 21,500
RSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting installments \| installment	3
PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting period	3 years
EPS PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of total awards granted	50.00%
rTSR PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting period	3 years
Percentage of total awards granted	50.00%
Risk free interest rate	4.33%
Annualized average volatility rate	46.77%
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 27.07
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	1 year
Minimum \| EPS PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting rights, percentage	0.00%
Minimum \| rTSR PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting rights, percentage	0.00%
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	5 years
Maximum \| EPS PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting rights, percentage	225.00%
Maximum \| rTSR PSUs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Award vesting rights, percentage	150.00%

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Net Sales by Product Group and End Market - Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,365,511	$ 1,471,539
Advanced products
Disaggregation of Revenue [Line Items]
Total net sales	1,069,709	1,067,377
Mainstream products
Disaggregation of Revenue [Line Items]
Total net sales	$ 295,802	$ 404,162

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.

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.

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Net Sales by Product Group and End Market - End Market (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total net sales (percentage)	100.00%	100.00%
Net sales \| Distribution Channel Concentration Risk \| Communications (smartphones, tablets)
Disaggregation of Revenue [Line Items]
Total net sales (percentage)	47.00%	45.00%
Net sales \| Distribution Channel Concentration Risk \| Automotive, industrial and other (ADAS, electrification, infotainment, safety)
Disaggregation of Revenue [Line Items]
Total net sales (percentage)	22.00%	26.00%
Net sales \| Distribution Channel Concentration Risk \| Computing (data center, infrastructure, PC/laptop, storage)
Disaggregation of Revenue [Line Items]
Total net sales (percentage)	17.00%	17.00%
Net sales \| Distribution Channel Concentration Risk \| Consumer (AR & gaming, connected home, home electronics, wearables)
Disaggregation of Revenue [Line Items]
Total net sales (percentage)	14.00%	12.00%

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Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Other Income and Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Other Income and Expenses [Abstract]
Interest income	$ (16,796)	$ (10,433)
Foreign currency loss (gain), net	1,545	6,763
Other, net	(44)	118
Total other (income) expense, net	$ (15,295)	$ (3,552)

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Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 12,196	$ 10,864
Gross unrecognized tax benefits	$ 30,600		$ 31,500

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 58,897	$ 45,351
Net income attributable to Amkor common stockholders, diluted	$ 58,897	$ 45,351
Weighted-average number of common shares outstanding - basic (in shares)	246,008	245,330
Effect of dilutive securities:
Share-based awards (in shares)	1,606	1,757
Weighted-average number of common shares outstanding - diluted (in shares)	247,614	247,087
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.24	$ 0.18
Diluted (in dollars per share)	$ 0.24	$ 0.18

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Earnings Per Share - Narrative (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Share-based awards (in shares)	11	0

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,995,035	$ 3,699,701
Other comprehensive income (loss) before reclassifications	(9,300)	(1,468)
Amounts reclassified from accumulated other comprehensive income (loss)	(140)	(141)
Total other comprehensive income (loss)	(9,440)	(1,609)
Balance at end of period	4,030,608	3,727,163
Unrealized Gains (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	(253)	645
Amounts reclassified from accumulated other comprehensive income (loss)	(55)	(44)
Total other comprehensive income (loss)	(308)	601
Balance at end of period	(96)	(972)
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	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(85)	(97)
Total other comprehensive income (loss)	(85)	(97)
Balance at end of period	15,820	14,123
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	(9,047)	(2,113)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	(9,047)	(2,113)
Balance at end of period	(8,814)	1,939
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	16,350	16,699
Total other comprehensive income (loss)	(9,440)	(1,609)
Balance at end of period	$ 6,910	$ 15,090

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

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

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-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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-Topic 235
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Reference 39: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
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Reference 40: http://www.xbrl.org/2009/role/commonPracticeRef
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XML 56 R46.htm IDEA: XBRL DOCUMENT

Investments - Schedule of Cash Equivalents, and Short term Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Total, Amortized Cost	$ 617,573		$ 581,367
Total, Gross Unrealized Gains	376		615
Total, Gross Unrealized Losses	(474)		(409)
Total Fair Value	617,475		581,573
Proceeds from sale of cash equivalent investments	5,800	$ 13,000
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	449,570		469,451
Short-term investments, Gross Unrealized Gains	376		615
Short-term investments, Gross Unrealized Losses	(474)		(409)
Short-term investments, Total Fair Value	449,472		469,657
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	62,076		65,340
Short-term investments, Gross Unrealized Gains	99		170
Short-term investments, Gross Unrealized Losses	(27)		(22)
Short-term investments, Total Fair Value	62,148		65,488
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	19,294		17,086
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	19,294		17,086
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	45,383		56,273
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	45,383		56,273
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	255,876		251,671
Short-term investments, Gross Unrealized Gains	277		432
Short-term investments, Gross Unrealized Losses	(301)		(299)
Short-term investments, Total Fair Value	255,852		251,804
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	4,729		13,200
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	(4)		(9)
Short-term investments, Total Fair Value	4,725		13,191
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	62,212		65,881
Short-term investments, Gross Unrealized Gains	0		13
Short-term investments, Gross Unrealized Losses	(142)		(79)
Short-term investments, Total Fair Value	62,070		65,815
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	168,003		111,916
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	168,003		111,916
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, Total Fair Value			138
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	51,970		48,063
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	51,970		48,063
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	97,440		60,719
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	97,440		60,719
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	16,936		2,996
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	16,936		2,996
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	1,657
Cash equivalents, Gross Unrealized Gains	0
Cash equivalents, Gross Unrealized Losses	0
Cash equivalent, Total Fair Value	1,657
Level 1
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	195,740		146,616
Level 1 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	81,364		82,901
Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	19,294		17,086
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	62,070		65,815
Level 1 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	114,376		63,715
Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value			0
Level 1 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 1 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	97,440		60,719
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	16,936		2,996
Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0
Level 2
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	421,735		434,957
Level 2 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	368,108		386,756
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	62,148		65,488
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	45,383		56,273
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	255,852		251,804
Level 2 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	4,725		13,191
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 2 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	53,627		48,201
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value			138
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	51,970		48,063
Level 2 \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		$ 0
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	$ 1,657

XML 57 R47.htm IDEA: XBRL DOCUMENT

Investments - Contractual Maturities of Cash Equivalents And Available-for-Sale Debt Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Within 1 year, Amortized Cost	$ 459,067
After 1 year through 5 years, Amortized Cost	96,430
Total, Amortized Cost	617,573	$ 581,367
Within 1 year, Fair Value	458,887
After 1 year through 5 years, Fair Value	96,440
Total Fair Value	617,475	$ 581,573
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Asset-backed securities, Amortized Cost	62,076
Asset-backed securities, Fair Value	$ 62,148

XML 58 R48.htm IDEA: XBRL DOCUMENT

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

XML 59 R49.htm IDEA: XBRL DOCUMENT

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 24.4	$ 78.0
Discounts and Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 0.0	$ 0.2

XML 60 R50.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 224,983	$ 209,506
Total property, plant and equipment	10,117,059	9,971,780
Accumulated depreciation and amortization	(6,749,625)	(6,672,335)
Total property, plant and equipment, net	3,367,434	3,299,445
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	211,211	212,722
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	2,149,095	2,080,589
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	7,104,414	7,022,614
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	22,460	22,655
Software and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	206,633	200,362
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 198,263	$ 223,332

XML 61 R51.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 144,787	$ 156,614

XML 62 R52.htm IDEA: XBRL DOCUMENT

Property, Plant and Equipment - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jan. 01, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Net income	$ 58,897	$ 45,351
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.18
Test Equipment, Useful Lives
Property, Plant and Equipment [Line Items]
Reduction in depreciation expense	$ 15,000
Net income	$ 13,000
Diluted earnings per share (in dollars per share)	$ 0.05
Test Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives (in years)			7 years	5 years

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.

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