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(the \"Issuer\") in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on\nFebruary 20, 2025 (the \"Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax\nwithholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person."}],"balance_after":12887,"source":{"system":"sec-edgar","filing":"0001628280-26-046962","document":"wk-form4_1783024659.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026046962/wk-form4_1783024659.xml","form_type":"4"}},{"id":718998,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-07-02T20:37:42.000Z","date":"2026-06-30","kind":"exercise","planned":false,"acquired":true,"shares":8692,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":16612,"source":{"system":"sec-edgar","filing":"0001628280-26-046962","document":"wk-form4_1783024659.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026046962/wk-form4_1783024659.xml","form_type":"4"}},{"id":820834,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2026-04-02T22:52:50.000Z","date":"2026-03-31","kind":"exercise","planned":false,"acquired":false,"shares":8692,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 43,459 RSUs which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31,\n2026, and June 30, 2026, such that 100% will be vested on June 30, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 43,459 RSUs which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31,\n2026, and June 30, 2026, such that 100% will be vested on June 30, 2026."}],"balance_after":8692,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":8692},"source":{"system":"sec-edgar","filing":"0001628280-26-023387","document":"wk-form4_1775170368.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026023387/wk-form4_1775170368.xml","form_type":"4"}},{"id":820833,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-04-02T22:52:50.000Z","date":"2026-03-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":3725,"price":45.03,"value":167736.75,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction represents shares withheld by Amkor Technology, Inc. (the \"Issuer\") in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on\nFebruary 20, 2025 (the \"Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax\nwithholding obligations. 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The RSUs were awarded for no consideration\nother than the Reporting Person's service as a service provider of the Issuer and vested in four equal annual installments beginning on the first anniversary of the Grant Date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs on the Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration\nother than the Reporting Person's service as a service provider of the Issuer and vested in four equal annual installments beginning on the first anniversary of the Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs on the Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration\nother than the Reporting Person's service as a service provider of the Issuer and vested in four equal annual installments beginning on the first anniversary of the Grant Date."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":910},"source":{"system":"sec-edgar","filing":"0001628280-26-012302","document":"wk-form4_1772140658.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026012302/wk-form4_1772140658.xml","form_type":"4"}},{"id":880208,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-26T21:17:41.000Z","date":"2026-02-24","kind":"sale","planned":false,"acquired":false,"shares":12500,"price":48.75,"value":609375.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.73 to $48.81. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4."}],"balance_after":2953,"source":{"system":"sec-edgar","filing":"0001628280-26-012302","document":"wk-form4_1772140658.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026012302/wk-form4_1772140658.xml","form_type":"4"}},{"id":880207,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-26T21:17:41.000Z","date":"2026-02-24","kind":"tax_withholding","planned":false,"acquired":false,"shares":372,"price":48.53,"value":18053.16,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction represents shares withheld by Amkor Technology, Inc. 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The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2025 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2025 Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on the 2025 Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2025 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2025 Grant Date."}],"balance_after":21731,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":10494},"source":{"system":"sec-edgar","filing":"0001628280-26-011088","document":"wk-form4_1771967518.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026011088/wk-form4_1771967518.xml","form_type":"4"}},{"id":885758,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2026-02-24T21:12:00.000Z","date":"2026-02-20","kind":"exercise","planned":false,"acquired":false,"shares":6359,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs on the 2024 Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2024 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2024 Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs on the 2024 Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2024 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2024 Grant Date."}],"balance_after":6583,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":6359},"source":{"system":"sec-edgar","filing":"0001628280-26-011088","document":"wk-form4_1771967518.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026011088/wk-form4_1771967518.xml","form_type":"4"}},{"id":885757,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-24T21:12:00.000Z","date":"2026-02-20","kind":"tax_withholding","planned":false,"acquired":false,"shares":4286,"price":47.94,"value":205470.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The transaction represents shares withheld by the Issuer in connection with the vesting of certain RSUs granted to the Reporting Person on February 20, 2025 (the \"2025 Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. 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(the \"Issuer\") in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on\nFebruary 20, 2024 (the \"2024 Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person."}],"balance_after":8707,"source":{"system":"sec-edgar","filing":"0001628280-26-011088","document":"wk-form4_1771967518.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026011088/wk-form4_1771967518.xml","form_type":"4"}},{"id":885754,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-24T21:12:00.000Z","date":"2026-02-20","kind":"exercise","planned":false,"acquired":true,"shares":6359,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":11304,"source":{"system":"sec-edgar","filing":"0001628280-26-011088","document":"wk-form4_1771967518.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026011088/wk-form4_1771967518.xml","form_type":"4"}},{"id":891234,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":21394,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs granted on February 18, 2026 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in two equal annual installments beginning on December 31, 2026 such that 100% will be vested on December 31, 2027."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs granted on February 18, 2026 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in two equal annual installments beginning on December 31, 2026 such that 100% will be vested on December 31, 2027."}],"balance_after":21394,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":21394},"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":891233,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":53487,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 18, 2026 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan (the \"RSUs\"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 18, 2026 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan (the \"RSUs\"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date."}],"balance_after":53487,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":53487},"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":891232,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":2398,"price":46.74,"value":112082.52,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The transaction represents shares of the Issuer's common stock withheld by the Issuer in connection with the vesting of PSUs to satisfy the Reporting Person's tax withholding obligations. The Issuer\nwill pay these taxes on behalf of the Reporting Person."}],"balance_after":4945,"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":891231,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":5594,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The transaction represents the vesting on February 18, 2026 of 5,594 shares of common stock of the Issuer's underlying PSUs granted to the Reporting Person on February 20, 2025 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic earnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025."}],"balance_after":7343,"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":891230,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":814,"price":46.74,"value":38046.36,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The transaction represents shares of the Issuer's common stock withheld by the Issuer in connection with the vesting of PSUs to satisfy the Reporting Person's tax withholding obligations. The Issuer\nwill pay these taxes on behalf of the Reporting Person."}],"balance_after":1749,"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":891229,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-20T21:16:29.000Z","date":"2026-02-18","kind":"grant","planned":false,"acquired":true,"shares":1777,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports the vesting on February 18, 2026 of 1,777 shares of common stock of Amkor Technology, Inc. (the \"Issuer\") underlying performance-vested restricted stock units (\"PSUs\")\ngranted to the Reporting Person on February 20, 2024 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic\nearnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025."}],"balance_after":2563,"source":{"system":"sec-edgar","filing":"0001628280-26-010213","document":"wk-form4_1771622186.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026010213/wk-form4_1771622186.xml","form_type":"4"}},{"id":897884,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2026-02-18T21:13:10.000Z","date":"2026-02-16","kind":"exercise","planned":false,"acquired":false,"shares":1345,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"On the Grant Date, the Reporting Person was granted 5,567 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 5,567 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 5,567 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date."}],"balance_after":1391,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1345},"source":{"system":"sec-edgar","filing":"0001628280-26-009045","document":"wk-form4_1771449187.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026009045/wk-form4_1771449187.xml","form_type":"4"}},{"id":897883,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-18T21:13:10.000Z","date":"2026-02-17","kind":"sale","planned":false,"acquired":false,"shares":5316,"price":46.03,"value":244695.48,"ownership":{"direct":true},"balance_after":786,"source":{"system":"sec-edgar","filing":"0001628280-26-009045","document":"wk-form4_1771449187.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026009045/wk-form4_1771449187.xml","form_type":"4"}},{"id":897882,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-18T21:13:10.000Z","date":"2026-02-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":559,"price":47.48,"value":26541.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction represents shares withheld by Amkor Technology, Inc. (the \"Issuer\") in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on\nFebruary 16, 2023 (the \"Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax\nwithholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person."}],"balance_after":6102,"source":{"system":"sec-edgar","filing":"0001628280-26-009045","document":"wk-form4_1771449187.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026009045/wk-form4_1771449187.xml","form_type":"4"}},{"id":897881,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin K.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-02-18T21:13:10.000Z","date":"2026-02-16","kind":"exercise","planned":false,"acquired":true,"shares":1345,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":6661,"source":{"system":"sec-edgar","filing":"0001628280-26-009045","document":"wk-form4_1771449187.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026009045/wk-form4_1771449187.xml","form_type":"4"}},{"id":952896,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Restricted Stock Units","published_at":"2026-01-05T21:19:39.000Z","date":"2025-12-31","kind":"exercise","planned":false,"acquired":false,"shares":8692,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 43,459 RSUs which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31,\n2026, and June 30, 2026, such that 100% will be vested on June 30, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"On the Grant Date, the Reporting Person was granted 43,459 RSUs which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31,\n2026, and June 30, 2026, such that 100% will be vested on June 30, 2026."}],"balance_after":17384,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":8692},"source":{"system":"sec-edgar","filing":"0001628280-26-000450","document":"wk-form4_1767647970.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026000450/wk-form4_1767647970.xml","form_type":"4"}},{"id":952895,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2026-01-05T21:19:39.000Z","date":"2025-12-31","kind":"tax_withholding","planned":false,"acquired":false,"shares":3725,"price":39.48,"value":147063.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transaction represents shares withheld by Amkor Technology, Inc. (the \"Issuer\") in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on\nFebruary 20, 2025 (the \"Grant Date\") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax\nwithholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person."}],"balance_after":5316,"source":{"system":"sec-edgar","filing":"0001628280-26-000450","document":"wk-form4_1767647970.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026000450/wk-form4_1767647970.xml","form_type":"4"}},{"id":952894,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2026-01-05T21:19:39.000Z","date":"2025-12-31","kind":"exercise","planned":false,"acquired":true,"shares":8692,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":9041,"source":{"system":"sec-edgar","filing":"0001628280-26-000450","document":"wk-form4_1767647970.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828026000450/wk-form4_1767647970.xml","form_type":"4"}},{"id":968084,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2025-12-16T21:25:42.000Z","date":"2025-12-12","kind":"sale","planned":false,"acquired":false,"shares":11000,"price":46.21,"value":508310.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.92 to $46.52. The Reporting Person hereby undertakes to\nprovide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the \"Issuer\"), or any security holder of the Issuer, full information regarding the number of\nshares sold at each separate price within the range set forth in this footnote (1) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On February 21, 2025, the Reporting Person filed a Form 4 which inadvertently overreported the number of shares of common stock of the Issuer (\"Shares\") withheld by the Issuer in connection with the vesting of performance-vested restricted stock units to satisfy the Reporting Person's tax withholding obligations by 28 Shares. The amount of securities beneficially owned following the transaction reported in this Form 4 reflects a correction to the holdings of the Reporting Person previously reported on Form 4 since February 21, 2025, which understated holdings by 28 Shares."}],"balance_after":349,"source":{"system":"sec-edgar","filing":"0001628280-25-057395","document":"wk-form4_1765920340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828025057395/wk-form4_1765920340.xml","form_type":"4"}},{"id":996389,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Restricted Stock 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common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The reported transaction involved the withholding of 369 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."}],"balance_after":32225,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":369},"source":{"system":"sec-edgar","filing":"0001628280-25-052924","document":"wk-form4_1763501633.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828025052924/wk-form4_1763501633.xml","form_type":"4"}},{"id":996388,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, 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issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported transaction involved the withholding of 223 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported transaction involved the withholding of 223 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."}],"balance_after":12942,"derivative":{"exercise_price":0,"underlying":"Common 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stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The reported transaction involved the withholding of 47 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status."}],"balance_after":2736,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":47},"source":{"system":"sec-edgar","filing":"0001628280-25-052924","document":"wk-form4_1763501633.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000162828025052924/wk-form4_1763501633.xml","form_type":"4"}},{"id":996386,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, 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(the \"Issuer\") issuable upon the early vesting of an equal number of restricted stock units\n(\"RSUs\") to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"shares","element":"transactionShares","label":"F1","text":"The reported transaction involved the withholding of 30 shares of common stock of Amkor Technology, Inc. (the \"Issuer\") issuable upon the early vesting of an equal number of restricted stock units\n(\"RSUs\") to pay taxes associated with the Reporting Person's retirement eligibility status."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The reported transaction involved the withholding of 30 shares of common stock of Amkor Technology, Inc. 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The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in five equal installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, such that 100% will be vested on June 30, 2026."}],"balance_after":43459,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":43459},"source":{"system":"sec-edgar","filing":"0001047127-25-000040","document":"wk-form4_1740174289.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712725000040/wk-form4_1740174289.xml","form_type":"4"}},{"id":1253784,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Restricted Stock Units","published_at":"2025-02-21T21:45:03.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":32594,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Represents shares of the Issuer's common stock underlying time-vested RSUs granted on February 20, 2025 (the \"2025 Grant Date\") pursuant to the Issuer's Equity Incentive Plan, as amended. 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The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2025 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2025 Grant Date."}],"balance_after":32594,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":32594},"source":{"system":"sec-edgar","filing":"0001047127-25-000040","document":"wk-form4_1740174289.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712725000040/wk-form4_1740174289.xml","form_type":"4"}},{"id":1253783,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Restricted Stock Units","published_at":"2025-02-21T21:45:03.000Z","date":"2025-02-20","kind":"exercise","planned":false,"acquired":false,"shares":6358,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"On the 2024 Grant Date, the Reporting Person was granted 19,747 RSUs which vest in three equal annual installments beginning on the first anniversary of the 2024 Grant Date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"On the 2024 Grant Date, the Reporting Person was granted 19,747 RSUs which vest in three equal annual installments beginning on the first anniversary of the 2024 Grant Date."}],"balance_after":13165,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":6358},"source":{"system":"sec-edgar","filing":"0001047127-25-000040","document":"wk-form4_1740174289.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712725000040/wk-form4_1740174289.xml","form_type":"4"}},{"id":1253782,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2025-02-21T21:45:03.000Z","date":"2025-02-20","kind":"tax_withholding","planned":false,"acquired":false,"shares":2648,"price":1,"value":2648.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The transaction represents shares withheld by the Issuer in connection with the vesting of certain restricted stock units (\"RSUs\") granted to the Reporting Person on February 20, 2024 (the \"2024 Grant Date\")  pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. 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The Issuer will pay these taxes on behalf of the Reporting Person."}],"balance_after":4720,"source":{"system":"sec-edgar","filing":"0001047127-24-000167","document":"wk-form4_1723754409.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712724000167/wk-form4_1723754409.xml","form_type":"4"}},{"id":1432803,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-08-15T20:40:15.000Z","date":"2024-08-13","kind":"grant","planned":false,"acquired":true,"shares":8260,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This Form 4 reports the vesting on August 13, 2024 of 8,260 shares of common stock of Amkor Technology, Inc. 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The PSUs vested based on the achievement of either of two internal performance goals related to geographic expansion of the Issuer's manufacturing footprint and expanding the Issuer's advanced packaging capacity in support of end markets with high growth potential."}],"balance_after":8260,"source":{"system":"sec-edgar","filing":"0001047127-24-000167","document":"wk-form4_1723754409.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712724000167/wk-form4_1723754409.xml","form_type":"4"}},{"id":1482434,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-06-12T20:31:25.000Z","date":"2024-06-10","kind":"sale","planned":false,"acquired":false,"shares":4921,"price":33.22,"value":163475.62,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.22 to $33.24. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. 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These shares were withheld to satisfy the Reporting Person's tax withholding obligations.  The Issuer will pay these taxes on behalf of the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"On February 22, 2024, the Reporting Person filed a Form 4 (the \"Previous Form 4\") which inadvertently underreported by 28 shares the number of shares of Amkor Technology, Inc. (the \"Issuer\") common stock (\"Shares\") withheld by the Issuer in connection with the vesting of performance-vested restricted stock units to satisfy the Reporting Person's tax withholding obligations.  As a result, the Previous Form 4 inadvertently reported that the Reporting Person beneficially owned  4,411 Shares as of February 20, 2024, instead of 4,383.  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As of February 23, 2024, the Reporting Person beneficially owned 4,921 Shares."}],"balance_after":5293,"source":{"system":"sec-edgar","filing":"0001047127-24-000050","document":"wk-form4_1709069685.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1047127/000104712724000050/wk-form4_1709069685.xml","form_type":"4"}},{"id":1626072,"issuer":{"id":3481,"kind":"organization","name":"AMKOR TECHNOLOGY, INC.","symbol":"AMKR"},"owners":[{"id":27574,"kind":"person","name":"Engel Kevin K.","position":1,"cik":"0001965254","reported_name":"Engel Kevin","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Restricted Stock Units","published_at":"2024-02-22T22:37:22.000Z","date":"2024-02-20","kind":"grant","planned":false,"acquired":true,"shares":19747,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 20, 2024 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan (the \"RSUs\"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 20, 2024 (the \"Grant Date\") pursuant to the Issuer's Equity Incentive Plan (the \"RSUs\"). 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