Engel Kevin K.

SEC source: 0001047127-25-000048 · wk-form4_1740605759.xml · derivative · entry 4

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 940

Underlying: Common Stock · 910 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F3 · derivative.exercise_date: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F3 · derivative.expiration_date: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001047127-25-000048 · wk-form4_1740605759.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,877

F1 · kind: 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 February 24, 2022 (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 withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-25-000048 · wk-form4_1740605759.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,257

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · derivative · entry 7

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,459

Underlying: Common Stock · 43,459 shares

Expires not disclosed

F6 · derivative.exercise_date: Represents shares of the Issuer's common stock underlying time-vested RSUs granted on the 2025 Grant Date pursuant to the Issuer's Equity Incentive Plan, as amended. 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.

F6 · derivative.expiration_date: Represents shares of the Issuer's common stock underlying time-vested RSUs granted on the 2025 Grant Date pursuant to the Issuer's Equity Incentive Plan, as amended. 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.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · derivative · entry 6

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,594

Underlying: Common Stock · 32,594 shares

Expires not disclosed

F5 · derivative.exercise_date: 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. 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.

F5 · derivative.expiration_date: 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. 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.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · derivative · entry 5

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,165

Underlying: Common Stock · 6,358 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · nonDerivative · entry 4

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,347

F3 · kind: 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. 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.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · nonDerivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,995

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,637

F2 · kind: 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 will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-25-000040 · wk-form4_1740174289.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,980

F1 · kind: This Form 4 reports the vesting on February 19, 2025 of 2,731 shares of common stock of Amkor Technology, Inc. (the "Issuer") underlying performance-vested restricted stock units ("PSUs") granted 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 earnings per share performance goal over a one-year performance period beginning January 1, 2024 and ending on December 31, 2024.

SEC source: 0001047127-25-000025 · wk-form4_1740001420.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,783

Underlying: Common Stock · 1,345 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0001047127-25-000025 · wk-form4_1740001420.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,249

F1 · kind: 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 February 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 withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-25-000025 · wk-form4_1740001420.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,808

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-25-000011 · wk-form4_1739485740.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 790 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: On the Grant Date, the Reporting Person was granted 3,268 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F2 · derivative.expiration_date: On the Grant Date, the Reporting Person was granted 3,268 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001047127-25-000011 · wk-form4_1739485740.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 463

F1 · kind: 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 February 11, 2021 (the "Grant Date") pursuant to the Issuer's Second Amended and Restated 2007 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.

SEC source: 0001047127-25-000011 · wk-form4_1739485740.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 790

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · derivative · entry 12

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,523

Underlying: Common Stock · 224 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F4 · shares: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F4 · derivative.exercise_date: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F4 · derivative.expiration_date: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · derivative · entry 11

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,128

Underlying: Common Stock · 47 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F3 · shares: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F3 · derivative.exercise_date: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F3 · derivative.expiration_date: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · derivative · entry 10

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,850

Underlying: Common Stock · 30 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F2 · shares: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F2 · derivative.exercise_date: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

F2 · derivative.expiration_date: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · derivative · entry 9

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 790

Underlying: Common Stock · 27 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · shares: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · derivative.exercise_date: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · derivative.expiration_date: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 8

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F4 · kind: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 7

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 224

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · price: The reported transaction involved the withholding of 224 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 6

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 5

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: 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 restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 4

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · kind: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: The reported transaction involved the withholding of 30 shares of the Issuer's common stock issuable upon the early vesting of an equal number of restricted stock units RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000211 · wk-form4_1733866655.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-24-000167 · wk-form4_1723754409.xml · nonDerivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

SEC source: 0001047127-24-000167 · wk-form4_1723754409.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,720

F2 · kind: 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 will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-24-000167 · wk-form4_1723754409.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,260

F1 · kind: This Form 4 reports the vesting on August 13, 2024 of 8,260 shares of common stock of Amkor Technology, Inc. (the "Issuer") underlying performance-vested restricted stock units ("PSUs") granted to the Reporting Person on December 14, 2023 pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. 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.

SEC source: 0001047127-24-000129 · wk-form4_1718224278.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: 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. (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 (1) to this Form 4.

SEC source: 0001047127-24-000050 · wk-form4_1709069685.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,880

Underlying: Common Stock · 910 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F3 · derivative.exercise_date: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F3 · derivative.expiration_date: On the Grant Date, the Reporting Person was granted 3,761 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001047127-24-000050 · wk-form4_1709069685.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,921

F2 · kind: 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 24, 2022 (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 withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

F1 · balance_after: 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. As of February 23, 2024, the Reporting Person beneficially owned 4,921 Shares.

SEC source: 0001047127-24-000050 · wk-form4_1709069685.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,293

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: 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. As of February 23, 2024, the Reporting Person beneficially owned 4,921 Shares.

SEC source: 0001047127-24-000036 · wk-form4_1708641409.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,747

Underlying: Common Stock · 19,747 shares

Expires not disclosed

F3 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001047127-24-000036 · wk-form4_1708641409.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,411

F2 · kind: 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 will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-24-000036 · wk-form4_1708641409.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,003

F1 · kind: This Form 4 reports the vesting on February 20, 2024 of 5,755 shares of common stock of Amkor Technology, Inc. (the "Issuer") underlying performance-vested restricted stock units ("PSUs") granted to the Reporting Person on February 24, 2022 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 cumulative earnings per share performance goal over a two-year performance period beginning January 1, 2022 and ending on December 31, 2023.

SEC source: 0001047127-24-000026 · wk-form4_1708553507.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,175

Underlying: Common Stock · 1,345 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0001047127-24-000026 · wk-form4_1708553507.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,248

F1 · kind: 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 February 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 withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

SEC source: 0001047127-24-000026 · wk-form4_1708553507.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,807

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-24-000015 · wk-form4_1707862653.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 817

Underlying: Common Stock · 790 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: On the Grant Date, the Reporting Person was granted 3,268 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F2 · derivative.expiration_date: On the Grant Date, the Reporting Person was granted 3,268 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001047127-24-000015 · wk-form4_1707862653.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 462

F1 · kind: 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 February 11, 2021 (the "Grant Date") pursuant to the Issuer's Second Amended and Restated 2007 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.

SEC source: 0001047127-24-000015 · wk-form4_1707862653.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 790

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · derivative · entry 9

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,520

Underlying: Common Stock · 47 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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.

F3 · shares: 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.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · derivative · entry 8

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,790

Underlying: Common Stock · 30 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The reported transaction involved the withholding of 30 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.

F2 · shares: The reported transaction involved the withholding of 30 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.

F2 · derivative.exercise_date: The reported transaction involved the withholding of 30 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.

F2 · derivative.expiration_date: The reported transaction involved the withholding of 30 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.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · derivative · entry 7

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,607

Underlying: Common Stock · 27 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · shares: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · derivative.exercise_date: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

F1 · derivative.expiration_date: The reported transaction involved the withholding of 27 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · nonDerivative · entry 6

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: 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.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · nonDerivative · entry 5

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: 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.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.xml · nonDerivative · entry 4

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · kind: The reported transaction involved the withholding of 30 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.