0001047127-26-000020 | 10-Q | XBRL Viewer

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Earnings Per Share - Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share (Details) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Share-based awards (in shares)	22	38

Interim Financial Statements

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Interim Financial Statements

Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2026, and for the three months ended March 31, 2026 and 2025, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2025 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 2025 Form 10-K. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. 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. Certain prior year amounts have been recast to conform to current year presentation.

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.

Restricted Cash. Restricted cash mainly consists of collateral to fulfill construction requirements and funds to be used exclusively for labor costs.

Leases. Total long-term finance lease liabilities as of March 31, 2026 and December 31, 2025 were $94.6 million and $105.0 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, 2026 and December 31, 2025 were $276.3 million and $294.1 million, respectively.

Contract Liabilities. Contract liabilities were $392.4 million and $390.8 million as of March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026 and December 31, 2025, the short-term portions of the liabilities were $81.8 million and $69.6 million, respectively. Of the remaining contract liability balance as of March 31, 2026, $283.8 million is expected to be recognized in revenue over the next 1-5 years, and $26.8 million over the next 5-10 years. Revenue recognized during the three months ended March 31, 2026 and 2025 that was included in the contract liabilities balance at the beginning of the period was $16.8 million and $15.2 million, respectively. As of March 31, 2026, $100.0 million of standby letters of credit were issued and outstanding related to customer advance payments received.

Grant Accounting. From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Investment tax credits and grants receivable recorded reduce the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets. The following table presents investment tax credits and grants receivable as of March 31, 2026 and December 31, 2025:


	March 31, 2026		December 31, 2025
	(In thousands)
Investment tax credits recorded in:
Other current assets	$	33,604	$	33,604
Other assets	25,707		—
Grants receivable recorded in:
Other current assets	243		—
Other assets	25,073		13,321

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

In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2025-06”). ASU 2025-06 removes all references to project stages throughout ASC 350-40 and clarifies the applicable threshold to begin capitalizing costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using a prospective transition approach, a modified transition approach based on project status or a retrospective transition approach. We are currently evaluating the impact of this new standard on our financial statements and disclosures.

In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832) (“ASU 2025-10”). ASU 2025-10 provides guidance on the accounting for government grants received by a business entity, including grants related to assets and grants related to income. ASU 2025-10 is effective for annual reporting periods beginning after December 15, 2028, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using the following transition methods: (i) a modified prospective approach for government grants that are entered into on or after, or not complete as of, the effective date; (ii) a modified retrospective approach for government grants that are entered into on or after, or not complete as of, the beginning of earliest period presented; or (iii) a retrospective approach for all government grants. We are currently evaluating the impact of this new standard on our financial statements and disclosures.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 83,966	$ 21,853
Depreciation and amortization	170,903	153,821
Other operating activities and non-cash items	(5,871)	5,967
Changes in assets and liabilities	(103,911)	(157,492)
Net cash provided by operating activities	145,087	24,149
Cash flows from investing activities:
Payments for property, plant and equipment	(224,605)	(79,897)
Proceeds from sale of property, plant and equipment	7,179	4,209
Proceeds from foreign exchange forward contracts	14,899	16,674
Payments for foreign exchange forward contracts	(16,684)	(15,992)
Payments for short-term investments	(258,469)	(169,720)
Proceeds from sale of short-term investments	14,607	32,345
Proceeds from maturities of short-term investments	127,318	147,825
Other investing activities	1,036	1,502
Net cash used in investing activities	(334,719)	(63,054)
Cash flows from financing activities:
Payments of long-term debt	(27,737)	(25,493)
Payments of finance lease obligations	(14,543)	(15,659)
Payments of dividends	(20,694)	0
Other financing activities	(4,073)	(1,099)
Net cash used in financing activities	(67,047)	(42,251)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(282)	5,172
Net decrease in cash, cash equivalents and restricted cash	(256,961)	(75,984)
Cash, cash equivalents and restricted cash, beginning of period	1,446,123	1,134,312
Cash, cash equivalents and restricted cash, end of period	1,189,162	1,058,328
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	381,637	202,242
Dividends declared and unpaid	0	20,423
Right of use assets acquired through operating lease liabilities	239	395
Right of use assets acquired through finance lease liabilities	4,007	10,645
Property, plant and equipment acquired through exchange and derecognition of right of use assets	5,250	11,507
Grants and incentive receivables recognized for qualified capital expenditures	$ 37,648	$ 2,939

Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2026 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Other commitment	$ 468

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,506,287	$ 4,183,165
Total other comprehensive income (loss)	(1,556)	2,521
Balance at end of period	4,569,142	4,190,590
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	16,833	7,510
Other comprehensive income (loss) before reclassifications	(1,358)	2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(198)	(174)
Total other comprehensive income (loss)	(1,556)	2,521
Balance at end of period	15,277	10,031
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	662	(510)
Other comprehensive income (loss) before reclassifications	(2,540)	1,207
Amounts reclassified from accumulated other comprehensive income (loss)	(1)	(80)
Total other comprehensive income (loss)	(2,541)	1,127
Balance at end of period	(1,879)	617
Defined Benefit Pension
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	20,330	16,570
Other comprehensive income (loss) before reclassifications	74	(2,386)
Amounts reclassified from accumulated other comprehensive income (loss)	(197)	(94)
Total other comprehensive income (loss)	(123)	(2,480)
Balance at end of period	20,207	14,090
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(4,159)	(8,550)
Other comprehensive income (loss) before reclassifications	1,108	3,874
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	1,108	3,874
Balance at end of period	$ (3,051)	$ (4,676)

- Definition

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

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

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Amount after tax of 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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+ Details

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

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 (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2025	$	662	$	20,330	$	(4,159)	$	16,833
Other comprehensive income (loss) before reclassifications	(2,540)		74		1,108		(1,358)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(197)		—		(198)
Other comprehensive income (loss)	(2,541)		(123)		1,108		(1,556)
Accumulated other comprehensive income (loss) at March 31, 2026	$	(1,879)	$	20,207	$	(3,051)	$	15,277


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510
Other comprehensive income (loss) before reclassifications	1,207		(2,386)		3,874		2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(80)		(94)		—		(174)
Other comprehensive income (loss)	1,127		(2,480)		3,874		2,521
Accumulated other comprehensive income (loss) at March 31, 2025	$	617	$	14,090	$	(4,676)	$	10,031

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

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

(3) Foreign currency translation includes the gain (loss) from net investment hedges (Note 13).

- Definition

The entire disclosure for equity.

+ References

+ Details

Interim Financial Statements (Policies)	3 Months Ended
Interim Financial Statements (Policies)	Mar. 31, 2026
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, 2026, and for the three months ended March 31, 2026 and 2025, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2025 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 2025 Form 10-K. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. 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.
Restricted Cash	Restricted Cash. Restricted cash mainly consists of collateral to fulfill construction requirements and funds to be used exclusively for labor costs.
Goodwill	Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.
Grant Accounting	Grant Accounting. From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Investment tax credits and grants receivable recorded reduce the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets.
Recently Issued Standards	Recently Issued Standards. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which was subsequently amended and clarified. ASU 2024-03 requires disaggregation of key expense categories such as inventory purchases, employee compensation, depreciation and intangible asset amortization in the financial statements. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. Adoption of this ASU should be applied either prospectively after the effective date or retrospectively to any or all periods presented in the financial statements. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures. In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2025-06”). ASU 2025-06 removes all references to project stages throughout ASC 350-40 and clarifies the applicable threshold to begin capitalizing costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using a prospective transition approach, a modified transition approach based on project status or a retrospective transition approach. We are currently evaluating the impact of this new standard on our financial statements and disclosures. In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832) (“ASU 2025-10”). ASU 2025-10 provides guidance on the accounting for government grants received by a business entity, including grants related to assets and grants related to income. ASU 2025-10 is effective for annual reporting periods beginning after December 15, 2028, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using the following transition methods: (i) a modified prospective approach for government grants that are entered into on or after, or not complete as of, the effective date; (ii) a modified retrospective approach for government grants that are entered into on or after, or not complete as of, the beginning of earliest period presented; or (iii) a retrospective approach for all government grants. We are currently evaluating the impact of this new standard on our financial statements and 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.

- Definition

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.

+ References + Details

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

+ References

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+ Details

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of 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 (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2025	$	662	$	20,330	$	(4,159)	$	16,833
Other comprehensive income (loss) before reclassifications	(2,540)		74		1,108		(1,358)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)		(197)		—		(198)
Other comprehensive income (loss)	(2,541)		(123)		1,108		(1,556)
Accumulated other comprehensive income (loss) at March 31, 2026	$	(1,879)	$	20,207	$	(3,051)	$	15,277


	Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1)		Defined Benefit Pension (2)		Foreign Currency Translation (3)		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2024	$	(510)	$	16,570	$	(8,550)	$	7,510
Other comprehensive income (loss) before reclassifications	1,207		(2,386)		3,874		2,695
Amounts reclassified from accumulated other comprehensive income (loss)	(80)		(94)		—		(174)
Other comprehensive income (loss)	1,127		(2,480)		3,874		2,521
Accumulated other comprehensive income (loss) at March 31, 2025	$	617	$	14,090	$	(4,676)	$	10,031

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

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

(3) Foreign currency translation includes the gain (loss) from net investment hedges (Note 13).

Business Segments, Product Groups and End Markets - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total net sales	$ 1,684,701	$ 1,321,575
Concentration risk (as a percent)	100.00%	100.00%
Advanced products
Segment Reporting Information [Line Items]
Total net sales	$ 1,372,001	$ 1,063,617
Mainstream products
Segment Reporting Information [Line Items]
Total net sales	$ 312,700	$ 257,958
Communications (smartphones, tablets) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	44.00%	40.00%
Computing (data center, infrastructure, PC/laptop, storage) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	21.00%	22.00%
Automotive, industrial and other (ADAS, electrification, infotainment, safety) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	21.00%	21.00%
Consumer (AR & gaming, connected home, home electronics, wearables) \| Net sales \| Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk (as a percent)	14.00%	17.00%

Pension Plans (Tables)

3 Months Ended

Mar. 31, 2026

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,
	2026		2025
	(In thousands)
Service cost	$	3,038	$	3,261
Interest cost	1,583		1,434
Expected return on plan assets	(1,391)		(1,279)

Recognized actuarial gain	(222)		(119)
Net periodic pension cost	3,008		3,297
Curtailment gain	—		(434)

Total pension expense	$	3,008	$	2,863

Schedule of Defined Contribution Expense

The following table summarizes our defined contribution expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Defined contribution expense	$	10,688	$	9,304

Business Segments, Product Groups and End Markets - Narrative (Details)	3 Months Ended
	Mar. 31, 2026 segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments not disclosed flag	single operating segment

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

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, 2026				December 31, 2025
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	499,070	$	493,623	$	511,405	$	493,457
Revolving credit facilities and term loans (Level 2)	912,400		920,571		948,501		951,789
Total debt	$	1,411,470	$	1,414,194	$	1,459,906	$	1,445,246

Derivatives (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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

As of March 31, 2026 and December 31, 2025, our foreign exchange forward contracts consisted of the following:


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Euro dollar	$	25,174	$	165	Other current assets	$	17,880	$	(6)	Accrued expenses
Japanese yen	223,467		1,140		Other current assets	253,313		(848)		Accrued expenses
Korean won	70,103		646		Other current assets	82,752		(601)		Accrued expenses
Philippine peso	10,685		(4)		Accrued expenses	13,114		(76)		Accrued expenses
Singapore dollar	27,696		(30)		Accrued expenses	11,566		(27)		Accrued expenses
Taiwan dollar	40,666		(165)		Accrued expenses	36,598		(59)		Accrued expenses
Total forward contracts not designated as hedging instruments	$	397,791	$	1,752		$	415,223	$	(1,617)


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	121,243	$	(646)	Accrued expenses	$	123,846	$	425	Other current assets
Total forward contracts designated as net investment hedging instruments	$	121,243	$	(646)		$	123,846	$	425

Schedule of Derivative Instruments, Gain (Loss)

The following table presents the gain or loss recognized on our derivatives designated as net investment hedging instruments for the three months ended March 31, 2026 and 2025:


		For the Three Months Ended March 31,
	Location on Consolidated Financial Statements	2026		2025
		(In thousands)
Difference between forward rate and spot rate of the forward contracts	Other (income) expense, net	$	(980)	$	(1,318)
Changes in fair value of forward contracts	Other comprehensive income (loss)	$	1,173	$	(4,709)

Business Segments, Product Groups and End Markets

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Business Segments, Product Groups and End Markets

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


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net sales	$	1,684,701	$	1,321,575
Less:
Materials cost of sales	901,773		692,748
Labor cost of sales	180,549		159,164
Depreciation cost of sales	156,132		139,869
Other cost of sales	207,215		172,211
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652
Interest expense	17,710		16,809
Income tax expense	12,342		3,936
Other segment items (1)	(13,731)		(11,075)
Segment net income	$	83,966	$	21,853

(1) Other segment items include interest income, foreign currency (gain) loss, net and other (income) expense.

The following tables represent other balances included in net income or that are regularly provided to the Chief Operating Decision Maker (CODM):


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	16,220	$	14,453
Depreciation and amortization expense	170,903		153,821
Capital expenditures	224,605		79,897


	March 31, 2026		December 31, 2025
	(In thousands)
Total assets	$	8,298,634	$	8,136,309

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Advanced products (1)	$	1,372,001	$	1,063,617
Mainstream products (2)	312,700		257,958
Total net sales	$	1,684,701	$	1,321,575

(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,
	2026		2025
Communications (smartphones, tablets)	44	%	40	%
Computing (data center, infrastructure, PC/laptop, storage)	21	%	22	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	21	%	21	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	17	%
Total net sales	100	%	100	%

- Definition

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

+ References

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+ Details

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Land	$	240,573	$	247,450
Buildings and improvements	2,334,662		2,353,344
Machinery and equipment	8,167,711		7,946,040
Finance lease assets	210,868		217,855
Furniture, fixtures and other equipment	19,009		18,820
Software and computer equipment	225,627		229,769
Construction in progress	368,538		250,152
Total property, plant and equipment	11,566,988		11,263,430
Accumulated depreciation and amortization	(7,416,205)		(7,392,622)
Total property, plant and equipment, net	$	4,150,783	$	3,870,808

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Depreciation expense	$	170,780	$	153,699

Business Segments, Product Groups and End Markets - Schedule of Segment Revenue, Segment Profit or Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net sales	$ 1,684,701	$ 1,321,575
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Interest expense	17,710	16,809
Income tax expense	12,342	3,936
Net income	83,966	21,853
Reportable Segment
Segment Reporting Information [Line Items]
Net sales	1,684,701	1,321,575
Materials cost of sales	901,773	692,748
Labor cost of sales	180,549	159,164
Depreciation cost of sales	156,132	139,869
Other cost of sales	207,215	172,211
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Interest expense	17,710	16,809
Income tax expense	12,342	3,936
Other segment items	(13,731)	(11,075)
Net income	$ 83,966	$ 21,853

Earnings Per Share - Schedule of computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders, basic	$ 83,351	$ 21,128
Net income attributable to Amkor common stockholders, diluted	$ 83,351	$ 21,128
Weighted-average number of common shares outstanding - basic (in shares)	247,550	246,854
Effect of dilutive securities:
Share-based awards (in shares)	2,020	991
Weighted-average number of common shares outstanding - diluted (in shares)	249,570	247,845
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.34	$ 0.09
Diluted (in dollars per share)	$ 0.33	$ 0.09

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2026

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,
	2026		2025
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	83,351	$	21,128




Weighted-average number of common shares outstanding - basic	247,550		246,854
Effect of dilutive securities:
Share-based awards	2,020		991
Weighted-average number of common shares outstanding - diluted	249,570		247,845
Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	0.33		0.09

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

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


	For the Three Months Ended March 31,
	2026	2025
	(In thousands)
Share-based awards	22	38

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,411,470	$ 1,459,906
Fair Value \| Senior notes (Level 1) \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	499,070	511,405
Fair Value \| Revolving credit facilities and term loans (Level 2) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	912,400	948,501
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,414,194	1,445,246
Carrying Value \| Senior notes (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	493,623	493,457
Carrying Value \| Revolving credit facilities and term loans (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 920,571	$ 951,789

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Megan Faust [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On February 17, 2026, Megan Faust, Amkor’s Executive Vice President, Chief Financial Officer and Treasurer adopted a “Rule 10b5-1 trading arrangement” as such term is defined in paragraph (a) of Item 408 of Regulation S-K promulgated under the Securities Act, which is intended to satisfy the affirmative defense of Rule 10b5-1(c). Ms. Faust’s Rule 10b5-1 trading arrangement will terminate on the earliest of: (a) February 26, 2027; (b) the first date on which all trades have been executed or all trading orders relating to such trades have expired; and (c) the date on which Ms. Faust gives notice to terminate her Rule 10b5-1 trading arrangement. 10,000 shares of our common stock are to be sold under Ms. Faust’s Rule 10b5-1 trading arrangement.
Name	Megan Faust
Title	Executive Vice President, Chief Financial Officer and Treasurer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 17, 2026
Expiration Date	February 26, 2027
Arrangement Duration	374 days
Aggregate Available	10,000

Interim Financial Statements - Schedule of Investment Tax Credits and Grants Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investment Tax Credits
Government Assistance [Line Items]
Government assistance, asset, current	$ 33,604	$ 33,604
Government assistance, asset, noncurrent	25,707	0
Grant Receivable
Government Assistance [Line Items]
Government assistance, asset, current	243	0
Government assistance, asset, noncurrent	$ 25,073	$ 13,321

Investments - Schedule of Contractual Maturities of Cash Equivalents and Available-for-Sale Debt Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Within 1 year, Amortized Cost	$ 607,243
After 1 year through 5 years, Amortized Cost	286,115
After 5 years, Amortized Cost	8,011
Total, Amortized Cost	991,766	$ 1,057,043
Within 1 year, Fair Value	607,159
After 1 year through 5 years, Fair Value	284,257
After 5 years , Fair Value	8,011
Total Fair Value	989,756	$ 1,057,738
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Asset- and mortgage-backed securities, Amortized Cost	90,397
Asset- and mortgage-backed securities, Fair Value	$ 90,329

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Land	$	240,573	$	247,450
Buildings and improvements	2,334,662		2,353,344
Machinery and equipment	8,167,711		7,946,040
Finance lease assets	210,868		217,855
Furniture, fixtures and other equipment	19,009		18,820
Software and computer equipment	225,627		229,769
Construction in progress	368,538		250,152
Total property, plant and equipment	11,566,988		11,263,430
Accumulated depreciation and amortization	(7,416,205)		(7,392,622)
Total property, plant and equipment, net	$	4,150,783	$	3,870,808

The following table summarizes our depreciation expense:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Depreciation expense	$	170,780	$	153,699

Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Other Income and Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Other Income and Expenses [Abstract]
Interest income	$ (16,220)	$ (14,453)
Foreign currency (gain) loss, net	2,486	3,760
Other, net	3	(382)
Total other (income) expense, net	$ (13,731)	$ (11,075)

Derivatives - Schedule of Fair Value of Derivative Instruments in Statement of Financial Position (Details) - Foreign Exchange Forward - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative notional amount	$ 397,791	$ 415,223
Not Designated as Hedging Instrument \| Euro dollar
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	25,174
Derivative liability, notional amount		17,880
Not Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	223,467
Derivative liability, notional amount		253,313
Not Designated as Hedging Instrument \| Korean won
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount	70,103
Derivative liability, notional amount		82,752
Not Designated as Hedging Instrument \| Philippine peso
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	10,685	13,114
Not Designated as Hedging Instrument \| Singapore dollar
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	27,696	11,566
Not Designated as Hedging Instrument \| Taiwan dollar
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	40,666	36,598
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative notional amount	121,243	123,846
Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, notional amount		123,846
Derivative liability, notional amount	121,243
Level 2 \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	1,752	(1,617)
Level 2 \| Not Designated as Hedging Instrument \| Euro dollar
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 165
Derivative liability, fair value		$ (6)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 1,140
Derivative liability, fair value		$ (848)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Korean won
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 646
Derivative liability, fair value		$ (601)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Philippine peso
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (4)	$ (76)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Singapore dollar
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (30)	$ (27)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Not Designated as Hedging Instrument \| Taiwan dollar
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (165)	$ (59)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Level 2 \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (646)	$ 425
Level 2 \| Designated as Hedging Instrument \| Japanese yen
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		$ 425
Derivative liability, fair value	$ (646)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current

Property, Plant and Equipment - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 170,780	$ 153,699

Pension Plans - Schedule of Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Service cost	$ 3,038	$ 3,261
Interest cost	1,583	1,434
Expected return on plan assets	(1,391)	(1,279)
Recognized actuarial gain	(222)	(119)
Net periodic pension cost	3,008	3,297
Curtailment gain	0	(434)
Total pension expense	$ 3,008	$ 2,863

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 20.9	$ 9.4

Factoring of Accounts Receivable	3 Months Ended
Factoring of Accounts Receivable	Mar. 31, 2026
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, 2026 and 2025, we sold receivables totaling $20.9 million and $9.4 million, respectively, net of discounts and fees, which were insignificant for the respective periods.

COVER PAGE - shares	3 Months Ended
COVER PAGE - shares	Mar. 31, 2026	Apr. 21, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
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		247,872,518
Entity Central Index Key	0001047127
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

Investments - Schedule of Cash Equivalents, and Short term Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Total, Amortized Cost	$ 991,766		$ 1,057,043
Total, Gross Unrealized Gains	273		848
Total, Gross Unrealized Losses	(2,283)		(153)
Total Fair Value	989,756		1,057,738
Proceeds from sale of cash equivalent investments	2,000	$ 2,000
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	725,463		608,405
Short-term investments, Gross Unrealized Gains	272		846
Short-term investments, Gross Unrealized Losses	(2,283)		(153)
Short-term investments, Total Fair Value	723,452		609,098
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	89,484		69,433
Short-term investments, Gross Unrealized Gains	64		118
Short-term investments, Gross Unrealized Losses	(130)		(53)
Short-term investments, Total Fair Value	89,418		69,498
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	19,431		10,318
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	19,431		10,318
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	64,145		67,967
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	64,145		67,967
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	382,446		334,361
Short-term investments, Gross Unrealized Gains	169		592
Short-term investments, Gross Unrealized Losses	(1,646)		(73)
Short-term investments, Total Fair Value	380,969		334,880
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	6,559
Short-term investments, Gross Unrealized Gains	0
Short-term investments, Gross Unrealized Losses	(11)
Short-term investments, Total Fair Value	6,548
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	913		912
Short-term investments, Gross Unrealized Gains	0		2
Short-term investments, Gross Unrealized Losses	(2)		0
Short-term investments, Total Fair Value	911		914
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	1,011		3,042
Short-term investments, Gross Unrealized Gains	1		4
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	1,012		3,046
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	12,713		8,614
Short-term investments, Gross Unrealized Gains	1		0
Short-term investments, Gross Unrealized Losses	(37)		(12)
Short-term investments, Total Fair Value	12,677		8,602
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	140,750		106,705
Short-term investments, Gross Unrealized Gains	37		130
Short-term investments, Gross Unrealized Losses	(457)		(15)
Short-term investments, Total Fair Value	140,330		106,820
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Amortized Cost	8,011		7,053
Short-term investments, Gross Unrealized Gains	0		0
Short-term investments, Gross Unrealized Losses	0		0
Short-term investments, Total Fair Value	8,011		7,053
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	266,303		448,638
Cash equivalents, Gross Unrealized Gains	1		2
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	266,304		448,640
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	1,452
Cash equivalents, Gross Unrealized Gains	0
Cash equivalents, Gross Unrealized Losses	0
Cash equivalent, Total Fair Value	1,452
Short-term investments, Amortized Cost			2,501
Short-term investments, Gross Unrealized Gains			0
Short-term investments, Gross Unrealized Losses			0
Short-term investments, Total Fair Value			2,501
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	50,654		63,421
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	50,654		63,421
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	188,407		359,721
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	188,407		359,721
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	24,774		21,988
Cash equivalents, Gross Unrealized Gains	1		2
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	24,775		21,990
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	1,016		1,007
Cash equivalents, Gross Unrealized Gains	0		0
Cash equivalents, Gross Unrealized Losses	0		0
Cash equivalent, Total Fair Value	1,016		1,007
Level 1
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	374,395		501,350
Level 1 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	159,761		117,138
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	19,431		10,318
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 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0
Level 1 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Municipal 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	140,330		106,820
Level 1 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 1 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	214,634		384,212
Level 1 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	1,452
Short-term investments, Total Fair Value			2,501
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	188,407		359,721
Level 1 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	24,775		21,990
Level 1 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0		0
Level 2
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	615,361		556,388
Level 2 \| Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	563,691		491,960
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	89,418		69,498
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	64,145		67,967
Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	380,969		334,880
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	6,548
Level 2 \| Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	911		914
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	1,012		3,046
Level 2 \| U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	12,677		8,602
Level 2 \| U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	0		0
Level 2 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Short-term investments, Total Fair Value	8,011		7,053
Level 2 \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	51,670		64,428
Level 2 \| Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	0
Short-term investments, Total Fair Value			0
Level 2 \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	50,654		63,421
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 \| Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Cash equivalent, Total Fair Value	$ 1,016		$ 1,007

Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Debt

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


	March 31, 2026		December 31, 2025
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:

5.875% Senior notes, due October 2033	$	500,000	$	500,000
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (1)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.45% as of March 31, 2026, due May 2030	496,875		500,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (2)	—		—
Term loan, fixed rate at 2.12%, due December 2028	150,000		150,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (3)	—		—


Term loan, fixed rate at 1.23%, due December 2026	12,380		16,719
Term loan, fixed rate at 1.59%, due December 2027	34,621		40,074
Term loan, fixed rate at 1.80%, due December 2028	60,641		67,003
Term loan, fixed rate at 2.05%, due December 2029	80,803		87,295
Term loan, fixed rate at 2.42%, due December 2030	89,182		95,080




	1,424,502		1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	$	1,257,156	$	1,282,816

(1)In May 2025, we entered into a $1.0 billion senior secured revolving credit facility (the “2025 Revolving Credit Facility”) guaranteed by Amkor Technology Singapore Holding Pte. Ltd. (“ATSH”) and Guardian Assets, Inc. (“Guardian”). The maximum borrowing capacity under the 2025 Revolving Credit Facility is $1.0 billion. The 2025 Revolving Credit Facility includes an uncommitted optional accordion of up to $200.0 million, which may be incurred in the form of revolving commitment increases or term loans. As of March 31, 2026, $1.0 billion was available for future borrowings under the 2025 Revolving Credit Facility.

(2)In May 2024, we entered into a ₩80.0 billion (approximately $59 million) term loan agreement with the option to borrow and re-borrow the funds up to six times per year through May 2027. Principal is payable at maturity, and interest is payable monthly at a fixed rate of 3.95%. As of March 31, 2026, ₩80.0 billion, or approximately $53 million, was available to be drawn.

(3)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of March 31, 2026, $3.2 million was available to be drawn.

Certain of our debt is collateralized by the land, buildings, equipment and capital stock of subsidiaries. As of March 31, 2026, the collateralized debt balance was $924.5 million, of which $625.6 million of assets and subsidiary capital stock 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., ATSH and Guardian guarantee certain indebtedness. The agreements governing our indebtedness contain affirmative and negative covenants, including, among others, covenants to maintain a minimum interest coverage ratio and a maximum consolidated leverage ratio, which restrict our ability to pay dividends and could restrict our operations. These restrictions 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, 2026.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
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-URI https://asc.fasb.org/470/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Investments - Narrative (Details) - Level 1 - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Fair market value of held-to-maturity securities	$ 3.9
Amortized cost of held-to-maturity securities		$ 3.9

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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+ Details

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial. Legal Proceedings We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. Although the outcome of these matters is uncertain, we believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact on our business, liquidity, results of operations, financial condition or cash flows. Our evaluation of the potential impact of these claims and legal proceedings 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. Commitments We enter into various contracts related to the construction and development of our manufacturing facilities. As of March 31, 2026, the remaining commitments under these contracts were approximately $468 million.

Business Segments, Product Groups and End Markets - Schedule of Balances Included in Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting [Abstract]
Interest income	$ 16,220	$ 14,453
Depreciation and amortization expense	170,903	153,821
Capital expenditures	224,605	$ 79,897
Total assets	$ 8,298,634		$ 8,136,309

- Definition

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References + Details

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Income Tax Disclosure [Abstract]
Income tax expense	$ 12,342	$ 3,936
Gross unrecognized tax benefits	36,800		$ 36,100
Unrecognized tax benefits that would impact effective tax rate	$ 34,400

- Definition

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

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+ Details

Pension Plans

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

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,
	2026		2025
	(In thousands)
Service cost	$	3,038	$	3,261
Interest cost	1,583		1,434
Expected return on plan assets	(1,391)		(1,279)

Recognized actuarial gain	(222)		(119)
Net periodic pension cost	3,008		3,297
Curtailment gain	—		(434)

Total pension expense	$	3,008	$	2,863

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,
	2026		2025
	(In thousands)
Defined contribution expense	$	10,688	$	9,304

Investments (Tables)

3 Months Ended

Mar. 31, 2026

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, 2026
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	1,452	$	—	$	—	$	1,452	$	1,452	$	—
Commercial paper	50,654		—		—		50,654		—		50,654


Money market funds	188,407		—		—		188,407		188,407		—



U.S. government bonds	24,774		1		—		24,775		24,775		—
Variable rate demand notes	1,016		—		—		1,016		—		1,016
Total cash equivalents (2)	266,303		1		—		266,304		214,634		51,670

Short-term investments
Asset-backed securities	89,484		64		(130)		89,418		—		89,418
Certificate of deposits	19,431		—		—		19,431		19,431		—
Commercial paper	64,145		—		—		64,145		—		64,145
Corporate bonds	382,446		169		(1,646)		380,969		—		380,969
Foreign government bonds	6,559		—		(11)		6,548		—		6,548
Mortgage-backed securities	913		—		(2)		911		—		911
Municipal bonds	1,011		1		—		1,012		—		1,012
U.S. government agency bonds	12,713		1		(37)		12,677		—		12,677
U.S. government bonds	140,750		37		(457)		140,330		140,330		—
Variable rate demand notes	8,011		—		—		8,011		—		8,011
Total short-term investments	725,463		272		(2,283)		723,452		159,761		563,691
Total	$	991,766	$	273	$	(2,283)	$	989,756	$	374,395	$	615,361


	December 31, 2025
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	2,501	$	—	$	—	$	2,501	$	2,501	$	—
Commercial paper	63,421		—		—		63,421		—		63,421

Money market funds	359,721		—		—		359,721		359,721		—



U.S. government bonds	21,988		2		—		21,990		21,990		—
Variable rate demand notes	1,007		—		—		1,007		—		1,007
Total cash equivalents	448,638		2		—		448,640		384,212		64,428

Short-term investments
Asset-backed securities	69,433		118		(53)		69,498		—		69,498
Certificate of deposits	10,318		—		—		10,318		10,318		—
Commercial paper	67,967		—		—		67,967		—		67,967
Corporate bonds	334,361		592		(73)		334,880		—		334,880

Mortgage-backed securities	912		2		—		914		—		914
Municipal bonds	3,042		4		—		3,046		—		3,046
U.S. government agency bonds	8,614		—		(12)		8,602		—		8,602
U.S. government bonds	106,705		130		(15)		106,820		106,820		—
Variable rate demand notes	7,053		—		—		7,053		—		7,053
Total short-term investments	608,405		846		(153)		609,098		117,138		491,960
Total	$	1,057,043	$	848	$	(153)	$	1,057,738	$	501,350	$	556,388

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

(2)For the three months ended March 31, 2026 and 2025, we sold cash equivalent investments for proceeds of $2.0 million and $2.0 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, 2026:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	607,243	$	607,159
After 1 year through 5 years	286,115		284,257
After 5 years	8,011		8,011

Asset- and mortgage-backed securities	90,397		90,329
Total	$	991,766	$	989,756

- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 50
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2026
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense of $12.3 million for the three months ended March 31, 2026 reflects income taxes, foreign withholding taxes, minimum taxes and certain tax credits. 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 were $36.8 million and $36.1 million as of March 31, 2026 and December 31, 2025, respectively. As of March 31, 2026, $34.4 million 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 2013-2025. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits. There can be no assurance that the outcome of examinations will be favorable. In certain circumstances where we elect to appeal the results of an examination, we may be required to make tax assessment payments to proceed with the administrative appeal process. Current examinations include 2021 and 2023 Philippine income tax returns, 2022-2024 Japan income tax returns and 2020-2021 California income tax returns.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Property, Plant and Equipment - Schedule of property, plant and equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 210,868	$ 217,855
Total property, plant and equipment	11,566,988	11,263,430
Accumulated depreciation and amortization	(7,416,205)	(7,392,622)
Total property, plant and equipment, net	4,150,783	3,870,808
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	240,573	247,450
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	2,334,662	2,353,344
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	8,167,711	7,946,040
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	19,009	18,820
Software and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	225,627	229,769
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 368,538	$ 250,152

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Payroll and benefits	$ 107,849	$ 147,910
Deferred revenue and customer advances	81,826	69,611
Income taxes payable	58,062	32,845
Short-term finance lease liability	40,925	44,046
Accrued interest	16,112	8,972
Accrued pension and severance plan obligations	6,746	6,996
Other accrued expenses	53,819	59,713
Total accrued expenses	$ 365,339	$ 370,093

Debt - Schedule of Debt (Details) $ in Thousands, ₩ in Billions	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 KRW (₩)	Dec. 31, 2025 USD ($)	May 31, 2025 USD ($)	May 31, 2024 USD ($) borrowing	May 31, 2024 KRW (₩) borrowing
Debt Instrument [Line Items]
Total debt	$ 1,424,502		$ 1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	1,257,156		1,282,816
Short-term term loans, variable rate \| Japan \| Subsidiary Term Loans
Debt Instrument [Line Items]
Total debt	0		0
Borrowing capacity available	$ 3,200
Senior Notes \| 5.875% Senior notes, due October 2033
Debt Instrument [Line Items]
Interest rate (as a percent)	5.875%	5.875%
Total debt	$ 500,000		500,000
Line of Credit \| 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 \| Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate spread (as a percent)	1.75%
Total debt	$ 0		0
Line of Credit \| 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, borrowing capacity				$ 1,000,000
Increase in maximum borrowing capacity amount				$ 200,000
Current borrowing capacity	$ 1,000,000
Term Loan \| Term A Loans, applicable bank rate plus 1.75%, 6.05% as of June 30, 2025, due May 2030
Debt Instrument [Line Items]
Effective interest rate (as a percent)	5.45%	5.45%
Interest rate spread (as a percent)	1.75%
Total debt	$ 496,875		500,000
Subsidiary Term Loans \| Term loan, fixed rate at 3.95%, due May 2027 \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)	3.95%	3.95%
Total debt	$ 0		0
Number of annual borrowings \| borrowing					6	6
Borrowing capacity available	$ 53,000	₩ 80.0			$ 59,000	₩ 80.0
Subsidiary Term Loans \| Term loan, fixed rate at 2.12%, due December 2028 \| Korea
Debt Instrument [Line Items]
Interest rate (as a percent)	2.12%	2.12%
Total debt	$ 150,000		150,000
Subsidiary Term Loans \| Term loan, fixed rate at 1.23%, due December 2026 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.23%	1.23%
Total debt	$ 12,380		16,719
Subsidiary Term Loans \| Term loan, fixed rate at 1.59%, due December 2027 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.59%	1.59%
Total debt	$ 34,621		40,074
Subsidiary Term Loans \| Term loan, fixed rate at 1.80%, due December 2028 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	1.80%	1.80%
Total debt	$ 60,641		67,003
Subsidiary Term Loans \| Term loan, fixed rate at 2.05%, due December 2029 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	2.05%	2.05%
Total debt	$ 80,803		87,295
Subsidiary Term Loans \| Term loan, fixed rate at 2.42%, due December 2030 \| Japan
Debt Instrument [Line Items]
Interest rate (as a percent)	2.42%	2.42%
Total debt	$ 89,182		$ 95,080

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net sales	$ 1,684,701	$ 1,321,575
Cost of sales	1,445,669	1,163,992
Gross profit	239,032	157,583
Selling, general and administrative	96,987	80,408
Research and development	41,758	45,652
Total operating expenses	138,745	126,060
Operating income	100,287	31,523
Interest expense	17,710	16,809
Other (income) expense, net	(13,731)	(11,075)
Total other expense, net	3,979	5,734
Income before taxes	96,308	25,789
Income tax expense	12,342	3,936
Net income	83,966	21,853
Net income attributable to non-controlling interests	(615)	(725)
Net income attributable to Amkor	$ 83,351	$ 21,128
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.34	$ 0.09
Diluted (in dollars per share)	$ 0.33	$ 0.09
Shares used in computing per common share amounts:
Basic (in shares)	247,550	246,854
Diluted (in shares)	249,570	247,845

Pension Plans - Schedule of Defined Contribution Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Retirement Benefits [Abstract]
Defined contribution expense	$ 10,688	$ 9,304

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 1,121,183	$ 1,378,347
Restricted cash	175	0
Short-term investments (amortized cost of $729,328 and $612,344 in 2026 and 2025, respectively)	727,317	613,038
Accounts receivable, net of allowances	1,287,879	1,354,825
Inventories	494,620	437,797
Other current assets	120,435	100,754
Total current assets	3,751,609	3,884,761
Property, plant and equipment, net	4,150,783	3,870,808
Operating lease right of use assets	90,278	93,449
Goodwill	17,775	18,003
Restricted cash	67,804	67,776
Other assets	220,385	201,512
Total assets	8,298,634	8,136,309
Current liabilities:
Short-term borrowings and current portion of long-term debt	157,038	162,430
Trade accounts payable	832,101	912,766
Capital expenditures payable	488,731	243,543
Short-term operating lease liability	23,570	23,140
Accrued expenses	365,339	370,093
Total current liabilities	1,866,779	1,711,972
Long-term debt	1,257,156	1,282,816
Pension and severance obligations	67,947	69,218
Long-term operating lease liabilities	44,194	48,549
Other non-current liabilities	493,416	517,467
Total liabilities	3,729,492	3,630,022
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; 294,394 and 293,756 shares issued; and 247,828 and 247,303 shares outstanding in 2026 and 2025, respectively	294	294
Additional paid-in capital	2,060,642	2,054,051
Retained earnings	2,689,683	2,627,038
Accumulated other comprehensive income (loss)	15,277	16,833
Treasury stock, at cost, 46,566 and 46,453 shares in 2026 and 2025, respectively	(232,385)	(227,110)
Total Amkor stockholders’ equity	4,533,511	4,471,106
Non-controlling interests in subsidiaries	35,631	35,181
Total equity	4,569,142	4,506,287
Total liabilities and equity	$ 8,298,634	$ 8,136,309

Investments

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Investments

All of our available-for-sale debt investments as of March 31, 2026 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, 2026
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	1,452	$	—	$	—	$	1,452	$	1,452	$	—
Commercial paper	50,654		—		—		50,654		—		50,654


Money market funds	188,407		—		—		188,407		188,407		—



U.S. government bonds	24,774		1		—		24,775		24,775		—
Variable rate demand notes	1,016		—		—		1,016		—		1,016
Total cash equivalents (2)	266,303		1		—		266,304		214,634		51,670

Short-term investments
Asset-backed securities	89,484		64		(130)		89,418		—		89,418
Certificate of deposits	19,431		—		—		19,431		19,431		—
Commercial paper	64,145		—		—		64,145		—		64,145
Corporate bonds	382,446		169		(1,646)		380,969		—		380,969
Foreign government bonds	6,559		—		(11)		6,548		—		6,548
Mortgage-backed securities	913		—		(2)		911		—		911
Municipal bonds	1,011		1		—		1,012		—		1,012
U.S. government agency bonds	12,713		1		(37)		12,677		—		12,677
U.S. government bonds	140,750		37		(457)		140,330		140,330		—
Variable rate demand notes	8,011		—		—		8,011		—		8,011
Total short-term investments	725,463		272		(2,283)		723,452		159,761		563,691
Total	$	991,766	$	273	$	(2,283)	$	989,756	$	374,395	$	615,361


	December 31, 2025
									Fair Value Level
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)		Total Fair Value		Level 1		Level 2
	(In thousands)
Cash equivalents

Certificate of deposits	$	2,501	$	—	$	—	$	2,501	$	2,501	$	—
Commercial paper	63,421		—		—		63,421		—		63,421

Money market funds	359,721		—		—		359,721		359,721		—



U.S. government bonds	21,988		2		—		21,990		21,990		—
Variable rate demand notes	1,007		—		—		1,007		—		1,007
Total cash equivalents	448,638		2		—		448,640		384,212		64,428

Short-term investments
Asset-backed securities	69,433		118		(53)		69,498		—		69,498
Certificate of deposits	10,318		—		—		10,318		10,318		—
Commercial paper	67,967		—		—		67,967		—		67,967
Corporate bonds	334,361		592		(73)		334,880		—		334,880

Mortgage-backed securities	912		2		—		914		—		914
Municipal bonds	3,042		4		—		3,046		—		3,046
U.S. government agency bonds	8,614		—		(12)		8,602		—		8,602
U.S. government bonds	106,705		130		(15)		106,820		106,820		—
Variable rate demand notes	7,053		—		—		7,053		—		7,053
Total short-term investments	608,405		846		(153)		609,098		117,138		491,960
Total	$	1,057,043	$	848	$	(153)	$	1,057,738	$	501,350	$	556,388

(2)For the three months ended March 31, 2026 and 2025, we sold cash equivalent investments for proceeds of $2.0 million and $2.0 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, 2026:


	Amortized Cost		Fair Value
	(In thousands)
Within 1 year	$	607,243	$	607,159
After 1 year through 5 years	286,115		284,257
After 5 years	8,011		8,011

Asset- and mortgage-backed securities	90,397		90,329
Total	$	991,766	$	989,756

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

As of March 31, 2026 and December 31, 2025, the amortized cost and the fair market value of our held-to-maturity government bonds (Level 1) maturing within a year were $3.9 million for both periods.

Earnings Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings Per Share

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

Diluted EPS is computed based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, performance-vested restricted stock units (“PSUs”) and time-vested restricted stock units (“RSUs”).

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


	For the Three Months Ended March 31,
	2026		2025
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	83,351	$	21,128




Weighted-average number of common shares outstanding - basic	247,550		246,854
Effect of dilutive securities:
Share-based awards	2,020		991
Weighted-average number of common shares outstanding - diluted	249,570		247,845
Net income attributable to Amkor per common share:
Basic	$	0.34	$	0.09
Diluted	0.33		0.09

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,
	2026	2025
	(In thousands)
Share-based awards	22	38

Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

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

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

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

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

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


	March 31, 2026				December 31, 2025
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	499,070	$	493,623	$	511,405	$	493,457
Revolving credit facilities and term loans (Level 2)	912,400		920,571		948,501		951,789
Total debt	$	1,411,470	$	1,414,194	$	1,459,906	$	1,445,246

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Derivatives (Schedule of Gain (Loss) Recognized on Derivatives Designated) (Details) - Foreign Exchange Forward - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivatives, Fair Value [Line Items]
Difference between forward rate and spot rate of the forward contracts	$ (980)	$ (1,318)
Changes in fair value of forward contracts	$ 1,173	$ (4,709)

- Definition

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

+ References + Details

Interim Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Long-term finance lease liabilities	$ 94,600		$ 105,000
Unbilled receivables	276,300		294,100
Contract liabilities	392,400		390,800
Deferred revenue and customer advances	81,826		$ 69,611
Revenue recognized	16,800	$ 15,200
Customer advance payments received	100,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 283,800
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 26,800
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	1 year
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	5 years
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	5 years
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2031-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected timing of satisfaction, period	10 years

Debt (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Short-Term Borrowings and Long-Term Debt

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


	March 31, 2026		December 31, 2025
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:

5.875% Senior notes, due October 2033	$	500,000	$	500,000
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (1)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.45% as of March 31, 2026, due May 2030	496,875		500,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (2)	—		—
Term loan, fixed rate at 2.12%, due December 2028	150,000		150,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (3)	—		—


Term loan, fixed rate at 1.23%, due December 2026	12,380		16,719
Term loan, fixed rate at 1.59%, due December 2027	34,621		40,074
Term loan, fixed rate at 1.80%, due December 2028	60,641		67,003
Term loan, fixed rate at 2.05%, due December 2029	80,803		87,295
Term loan, fixed rate at 2.42%, due December 2030	89,182		95,080




	1,424,502		1,456,171
Less: Unamortized discount and deferred debt costs, net	(10,308)		(10,925)
Less: Short-term borrowings and current portion of long-term debt	(157,038)		(162,430)
Long-term debt	$	1,257,156	$	1,282,816

(3)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of March 31, 2026, $3.2 million was available to be drawn.

Derivatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Derivatives - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	$ (3.6)	$ (2.9)

Other Income and Expense

3 Months Ended

Mar. 31, 2026

Other Income and Expenses [Abstract]

Other Income and Expense

Other income and expense consist of the following:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	(16,220)	$	(14,453)
Foreign currency (gain) loss, net	2,486		3,760



Other, net	3		(382)
Total other (income) expense, net	$	(13,731)	$	(11,075)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.08352	$ 0.08269

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, 2024			293,052
Balance at beginning of period at Dec. 31, 2024	$ 4,183,165	$ 4,149,545	$ 293	$ 2,031,643	$ 2,335,132	$ 7,510	$ (225,033)	$ 33,620
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2025							(46,427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,853	21,128			21,128			725
Other comprehensive income (loss)	2,521	2,521				2,521
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(59)
Treasury stock acquired through surrender of shares for tax withholding	(1,319)	(1,319)					$ (1,319)
Issuance of stock through share-based compensation plans (in shares)			430
Issuance of stock through share-based compensation plans	769	769		769
Share-based compensation	4,196	4,196		4,196
Cash dividends declared	(20,430)	(20,430)			(20,430)
Subsidiary dividends to non-controlling interests	(165)							(165)
Balance at end of period, common stock (in shares) at Mar. 31, 2025			293,482
Balance at end of period at Mar. 31, 2025	$ 4,190,590	4,156,410	$ 293	2,036,608	2,335,830	10,031	$ (226,352)	34,180
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024							(46,368)
Balance at beginning of period, common stock (in shares) at Dec. 31, 2025	247,303		293,756
Balance at beginning of period at Dec. 31, 2025	$ 4,506,287	4,471,106	$ 294	2,054,051	2,627,038	16,833	$ (227,110)	35,181
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2026	(46,566)						(46,566)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 83,966	83,351			83,351			615
Other comprehensive income (loss)	(1,556)	(1,556)				(1,556)
Treasury stock acquired through surrender of shares for tax withholding (in shares)							(113)
Treasury stock acquired through surrender of shares for tax withholding	(5,275)	(5,275)					$ (5,275)
Issuance of stock through share-based compensation plans (in shares)			638
Issuance of stock through share-based compensation plans	500	500		500
Share-based compensation	6,091	6,091		6,091
Cash dividends declared	(20,706)	(20,706)			(20,706)
Subsidiary dividends to non-controlling interests	$ (165)							(165)
Balance at end of period, common stock (in shares) at Mar. 31, 2026	247,828		294,394
Balance at end of period at Mar. 31, 2026	$ 4,569,142	$ 4,533,511	$ 294	$ 2,060,642	$ 2,689,683	$ 15,277	$ (232,385)	$ 35,631
Balance at end of period, treasury stock (in shares) at Dec. 31, 2025	(46,453)						(46,453)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 83,966	$ 21,853
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(2,541)	1,127
Adjustments to unrealized components of defined benefit pension plans	(123)	(2,480)
Foreign currency translation	1,108	3,874
Total other comprehensive income (loss)	(1,556)	2,521
Comprehensive income	82,410	24,374
Comprehensive income attributable to non-controlling interests	(615)	(725)
Comprehensive income attributable to Amkor	$ 81,795	$ 23,649

Other Income and Expense (Tables)

3 Months Ended

Mar. 31, 2026

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,
	2026		2025
	(In thousands)
Interest income	$	(16,220)	$	(14,453)
Foreign currency (gain) loss, net	2,486		3,760



Other, net	3		(382)
Total other (income) expense, net	$	(13,731)	$	(11,075)

Interim Financial Statements (Tables)

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Government Assistance

The following table presents investment tax credits and grants receivable as of March 31, 2026 and December 31, 2025:


	March 31, 2026		December 31, 2025
	(In thousands)
Investment tax credits recorded in:
Other current assets	$	33,604	$	33,604
Other assets	25,707		—
Grants receivable recorded in:
Other current assets	243		—
Other assets	25,073		13,321

Accrued Expenses

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Payroll and benefits	$	107,849	$	147,910

Deferred revenue and customer advances	81,826		69,611
Income taxes payable	58,062		32,845
Short-term finance lease liability	40,925		44,046
Accrued interest	16,112		8,972

Accrued pension and severance plan obligations	6,746		6,996
Other accrued expenses	53,819		59,713
Total accrued expenses	$	365,339	$	370,093

Business Segments, Product Groups and End Markets (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

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

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


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Net sales	$	1,684,701	$	1,321,575
Less:
Materials cost of sales	901,773		692,748
Labor cost of sales	180,549		159,164
Depreciation cost of sales	156,132		139,869
Other cost of sales	207,215		172,211
Selling, general and administrative	96,987		80,408
Research and development	41,758		45,652
Interest expense	17,710		16,809
Income tax expense	12,342		3,936
Other segment items (1)	(13,731)		(11,075)
Segment net income	$	83,966	$	21,853

(1) Other segment items include interest income, foreign currency (gain) loss, net and other (income) expense.

The following tables represent other balances included in net income or that are regularly provided to the Chief Operating Decision Maker (CODM):


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Interest income	$	16,220	$	14,453
Depreciation and amortization expense	170,903		153,821
Capital expenditures	224,605		79,897


	March 31, 2026		December 31, 2025
	(In thousands)
Total assets	$	8,298,634	$	8,136,309

Schedule of Revenue from External Customers by Products and Services

The following table presents our net sales by product group:


	For the Three Months Ended March 31,
	2026		2025
	(In thousands)
Advanced products (1)	$	1,372,001	$	1,063,617
Mainstream products (2)	312,700		257,958
Total net sales	$	1,684,701	$	1,321,575

(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,
	2026		2025
Communications (smartphones, tablets)	44	%	40	%
Computing (data center, infrastructure, PC/laptop, storage)	21	%	22	%
Automotive, industrial and other (ADAS, electrification, infotainment, safety)	21	%	21	%
Consumer (AR & gaming, connected home, home electronics, wearables)	14	%	17	%
Total net sales	100	%	100	%

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Short term investments amortized cost	$ 729,328	$ 612,344
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	10,000
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	500,000
Common stock, shares issued (in shares)	294,394	293,756
Common stock, shares outstanding (in shares)	247,828	247,303
Treasury stock, shares (in shares)	46,566	46,453

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:


	March 31, 2026		December 31, 2025
	(In thousands)
Payroll and benefits	$	107,849	$	147,910

Deferred revenue and customer advances	81,826		69,611
Income taxes payable	58,062		32,845
Short-term finance lease liability	40,925		44,046
Accrued interest	16,112		8,972

Accrued pension and severance plan obligations	6,746		6,996
Other accrued expenses	53,819		59,713
Total accrued expenses	$	365,339	$	370,093

Debt - Narrative (Details) $ in Millions	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Collateralized debt	$ 924.5
Asset Pledged as Collateral
Debt Instrument [Line Items]
Collateralized debt	$ 625.6

- Definition

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

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+ Details

Derivatives

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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.

We hedge certain net investment positions in foreign subsidiaries. To accomplish this, we enter into foreign currency forward contracts, generally settled monthly, that are designated as hedges of net investments.

As of March 31, 2026 and December 31, 2025, our foreign exchange forward contracts consisted of the following:


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts not designated as hedging instruments
Euro dollar	$	25,174	$	165	Other current assets	$	17,880	$	(6)	Accrued expenses
Japanese yen	223,467		1,140		Other current assets	253,313		(848)		Accrued expenses
Korean won	70,103		646		Other current assets	82,752		(601)		Accrued expenses
Philippine peso	10,685		(4)		Accrued expenses	13,114		(76)		Accrued expenses
Singapore dollar	27,696		(30)		Accrued expenses	11,566		(27)		Accrued expenses
Taiwan dollar	40,666		(165)		Accrued expenses	36,598		(59)		Accrued expenses
Total forward contracts not designated as hedging instruments	$	397,791	$	1,752		$	415,223	$	(1,617)


	March 31, 2026					December 31, 2025
	Notional Value		Fair Value (Level 2)		Balance Sheet Location	Notional Value		Fair Value (Level 2)		Balance Sheet Location
	(In thousands)
Forward contracts designated as net investment hedging instruments
Japanese yen	$	121,243	$	(646)	Accrued expenses	$	123,846	$	425	Other current assets
Total forward contracts designated as net investment hedging instruments	$	121,243	$	(646)		$	123,846	$	425

For the three months ended March 31, 2026 and 2025, we incurred a net loss of $3.6 million and $2.9 million, respectively, due to the impact of derivatives not designated as hedging instruments, which includes the forward costs, and the revaluation of the related hedged items.

The following table presents the gain or loss recognized on our derivatives designated as net investment hedging instruments for the three months ended March 31, 2026 and 2025:


		For the Three Months Ended March 31,
	Location on Consolidated Financial Statements	2026		2025
		(In thousands)
Difference between forward rate and spot rate of the forward contracts	Other (income) expense, net	$	(980)	$	(1,318)
Changes in fair value of forward contracts	Other comprehensive income (loss)	$	1,173	$	(4,709)

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details