AMKR

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.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.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 RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

SEC source: 0001047127-23-000055 · wk-form4_1703194439.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: 0001047127-23-000055 · wk-form4_1703194439.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: 0001047127-23-000054 · wk-form4_1703194358.xml · derivative · entry 9

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,357

Underlying: Common Stock · 66 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 66 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 66 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 66 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 66 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: 0001047127-23-000054 · wk-form4_1703194358.xml · derivative · entry 8

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,577

Underlying: Common Stock · 65 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 65 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 65 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 65 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 65 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: 0001047127-23-000054 · wk-form4_1703194358.xml · derivative · entry 7

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,337

Underlying: Common Stock · 24 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 24 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 24 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 24 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 24 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 6

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,911

F3 · kind: The reported transaction involved the withholding of 66 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 5

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,977

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 66 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 4

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,911

F2 · kind: The reported transaction involved the withholding of 65 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 3

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,976

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 65 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 2

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,911

F1 · kind: The reported transaction involved the withholding of 24 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: 0001047127-23-000054 · wk-form4_1703194358.xml · nonDerivative · entry 1

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,935

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 24 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: 0001047127-23-000051 · wk-form4_1703021434.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,200

Underlying: Common Stock · 2,700 shares

Expires 2029-02-15

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: This stock option (the "Option") to acquire 150,000 shares of the Issuer's common stock (the "Option Shares") was granted on February 15, 2019 (the "Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option vested on the fourth anniversary of the Option Grant Date.

SEC source: 0001047127-23-000051 · wk-form4_1703021434.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,394

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 23, 2023.

SEC source: 0001047127-23-000051 · wk-form4_1703021434.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,094

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: 0001047127-23-000049 · wk-form4_1702935962.xml · derivative · entry 1

Rutten Guillaume Marie Jean · CIK 0001596796 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,857

Underlying: Common Stock · 43,857 shares

Expires not disclosed

F1 · derivative.exercise_price: On December 14, 2023 (the "RSU Grant Date"), the Reporting Person was granted 43,857 time-vested restricted stock units ("RSUs") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the applicable award agreement. The RSUs convert into shares of the Issuer's common stock on a one-to-one basis and vest in full on July 1, 2024.

F1 · derivative.exercise_date: On December 14, 2023 (the "RSU Grant Date"), the Reporting Person was granted 43,857 time-vested restricted stock units ("RSUs") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the applicable award agreement. The RSUs convert into shares of the Issuer's common stock on a one-to-one basis and vest in full on July 1, 2024.

F1 · derivative.expiration_date: On December 14, 2023 (the "RSU Grant Date"), the Reporting Person was granted 43,857 time-vested restricted stock units ("RSUs") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the applicable award agreement. The RSUs convert into shares of the Issuer's common stock on a one-to-one basis and vest in full on July 1, 2024.

SEC source: 0001047127-23-000040 · wk-form4_1701900414.xml · derivative · entry 3

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2024-05-13

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: 0001047127-23-000040 · wk-form4_1701900414.xml · nonDerivative · entry 2

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,392

F1 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.25 to $28.38 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: 0001047127-23-000040 · wk-form4_1701900414.xml · nonDerivative · entry 1

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 68,392

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: 0001047127-23-000039 · wk-form4_1701900258.xml · nonDerivative · entry 1

Tily Gil C. · CIK 0001405591 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,218

SEC source: 0001047127-23-000035 · wk-form4_1700514785.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,900

Underlying: Common Stock · 2,700 shares

Expires 2029-02-15

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_date: This stock option (the "Option") to acquire 150,000 shares of the Issuer's common stock (the "Option Shares") was granted on February 15, 2019 (the "Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option vested on the fourth anniversary of the Option Grant Date.

SEC source: 0001047127-23-000035 · wk-form4_1700514785.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,394

F1 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 23, 2023.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.03 to $26.31. 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 (2) to this Form 4.

SEC source: 0001047127-23-000035 · wk-form4_1700514785.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,094

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: 0001047127-23-000036 · wk-form4_1700515128.xml · derivative · entry 3

Morse Robert Randolph · CIK 0001569086 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2024-05-13

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: This stock option (the "Option") to acquire 20,000 shares of the Issuer's common stock (the "Option Shares") was granted on May 13, 2014 (the "Option Grant Date") and vested in full on March 5, 2015.

SEC source: 0001047127-23-000036 · wk-form4_1700515128.xml · nonDerivative · entry 2

Morse Robert Randolph · CIK 0001569086 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,338

SEC source: 0001047127-23-000036 · wk-form4_1700515128.xml · nonDerivative · entry 1

Morse Robert Randolph · CIK 0001569086 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,392

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 · shares: Exempt purchase under Section 16b-3. Transaction executed as net exercise with Amkor Technology, Inc. (the "Issuer"), in which no shares were purchased or sold in the open market.

SEC source: 0001209191-23-055591 · doc4.xml · nonDerivative · entry 1

Family Trust Under the Susan Y. Kim 2012 Irrevocable Trust Agreement Dated 7/26/12 · CIK 0001728273 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 3,341,120 shares of the Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and John T. Kim are co-trustees of the Reporting Person.

SEC source: 0001209191-23-055590 · doc4.xml · nonDerivative · entry 1

Dylan Investments, LLC · CIK 0001881182 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 2,733,334 shares of the Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and Liam E. Blaney are the managers of the Reporting Person.

SEC source: 0001209191-23-055592 · doc4.xml · nonDerivative · entry 1

Jacqueline Investments, LLC · CIK 0001881170 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 2,733,333 shares of the Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and Liam E. Blaney are the managers of the Reporting Person.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 8

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By trusts (other than GRAT & Rev. Trust)

Disclosed balance after: 9,121,944

F9 · shares: On November 14, 2023, the Family Trust Under the Susan Y. Kim 2012 Irrevocable Trust Agreement dtd. 7/26/12 (the "SYK 2012 Family Trust") distributed 3,341,120 shares of the Issuer's Common Stock to KCP LLC. Because the Reporting Person and Susan Y. Kim are the managers of KCP LLC and co-trustees of the SYK 2012 Family Trust, such distribution was a mere change in the form of ownership and is being voluntarily reported by the Reporting Person on this Form 4.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 7

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 16,710,668

F9 · shares: On November 14, 2023, the Family Trust Under the Susan Y. Kim 2012 Irrevocable Trust Agreement dtd. 7/26/12 (the "SYK 2012 Family Trust") distributed 3,341,120 shares of the Issuer's Common Stock to KCP LLC. Because the Reporting Person and Susan Y. Kim are the managers of KCP LLC and co-trustees of the SYK 2012 Family Trust, such distribution was a mere change in the form of ownership and is being voluntarily reported by the Reporting Person on this Form 4.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 6

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 13,369,548

F8 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd. 8/29/18 distributed 1,211,193 shares of the Issuer's Common Stock to KCP LLC. The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 5

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 12,158,355

F7 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd. 4/1/20 distributed 1,958,355 shares of the Issuer's Common Stock to KCP LLC. The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 4

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 10,200,000

F6 · shares: On November 14, 2023, Dylan Investments, LLC distributed 2,733,334 shares of the Issuer's Common Stock to KCP LLC. The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 3

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 7,466,666

F5 · shares: On November 14, 2023, Jacqueline Investments, LLC distributed 2,733,333 shares of the Issuer's Common Stock to KCP LLC. The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 2

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 4,733,333

F4 · shares: On November 14, 2023, Alexandra Investments, LLC distributed 2,733,333 shares of the Issuer's Common Stock to KCP LLC. The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055588 · doc4.xml · nonDerivative · entry 1

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (11)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Kim Capital Partners - KCP, LLC

Disclosed balance after: 2,000,000

F1 · shares: On November 14, 2023, Susan Y. Kim distributed 2,000,000 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to Kim Capital Partners - KCP, LLC ("KCP LLC"). The Reporting Person and Susan Y. Kim are the managers of KCP LLC.

F2 · balance_after: The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

F3 · balance_after: The Reporting Person is (i) a trustee of family trusts for the benefit of his immediate family members which own 9,121,944 shares of the Issuer's Common Stock,(ii) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock, (iii) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock and (iv) as referenced in footnote 10, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

SEC source: 0001209191-23-055589 · doc4.xml · nonDerivative · entry 1

Family Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd. 8/29/18 · CIK 0001996857 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 1,211,193 shares of the Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and James J. Kim are co-trustees of the Reporting Person.

SEC source: 0001209191-23-055584 · doc4.xml · nonDerivative · entry 1

Alexandra Investments, LLC · CIK 0001881163 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 2,733,333 shares of the Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and Liam E. Blaney are the managers of the Reporting Person.

SEC source: 0001209191-23-055587 · doc4.xml · nonDerivative · entry 2

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (6)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Susan Y. Kim Family Trust U/A dtd. 8/29/18

Disclosed balance after: 0

F2 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd. 8/29/18 distributed 1,211,193 shares of the Issuer's Common Stock to Kim Capital Partners - KCP, LLC. The Reporting Person and Susan Y. Kim are co-trustees of the trust.

SEC source: 0001209191-23-055587 · doc4.xml · nonDerivative · entry 1

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (6)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Susan Y. Kim Family Trust U/A dtd. 4/1/20

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd. 4/1/20 distributed 1,958,355 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to Kim Capital Partners - KCP, LLC. The Reporting Person and Susan Y. Kim are co-trustees of the trust.

SEC source: 0001209191-23-055585 · doc4.xml · nonDerivative · entry 2

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (5)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 12,087,709

F4 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd. 8/29/18 distributed 1,211,193 shares of the Issuer's Common Stock to Kim Capital Partners - KCP, LLC. The Reporting Person's spouse and Susan Y. Kim are co-trustees of the trust.

F3 · balance_after: James J. Kim is the spouse of the Reporting Person. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

SEC source: 0001209191-23-055585 · doc4.xml · nonDerivative · entry 1

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (5)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 13,298,902

F1 · shares: On November 14, 2023, the Family Trust under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dtd. 4/1/20 distributed 1,958,355 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to Kim Capital Partners - KCP, LLC. The Reporting Person's spouse and Susan Y. Kim are co-trustees of the trust.

F2 · balance_after: Reflects the conversion of the Reporting Person's spouse from general partner to limited partner of 915 Investments, LP, which decreased the Reporting Person's spouse's beneficial ownership by 39,594,980 shares of the Issuer's Common Stock.

F3 · balance_after: James J. Kim is the spouse of the Reporting Person. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

SEC source: 0001209191-23-055583 · doc4.xml · nonDerivative · entry 1

Family Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement Dated 04/01/2020 · CIK 0001994770 · Member of 10% owner group (2)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On November 14, 2023, the Reporting Person distributed 1,958,355 shares of Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and James J. Kim are co-trustees of the Reporting Person.

SEC source: 0001209191-23-055582 · doc4.xml · nonDerivative · entry 3

Blaney Liam E · CIK 0001901848 · Member of 10% owner group (4)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Dylan Investments, LLC

Disclosed balance after: 0

F3 · shares: On November 14, 2023, Dylan Investments, LLC ("DI LLC") distributed 2,733,334 shares of the Issuer's Common Stock to Kim Capital Partners - KCP, LLC. The Reporting Person and Susan Y. Kim are the managers of DI LLC.

SEC source: 0001209191-23-055582 · doc4.xml · nonDerivative · entry 2

Blaney Liam E · CIK 0001901848 · Member of 10% owner group (4)

10b5-1 filing: No plan indicated

Ownership: Indirect · By Jacqueline Investments, LLC

Disclosed balance after: 0

F2 · shares: On November 14, 2023, Jacqueline Investments, LLC ("JI LLC") distributed 2,733,333 shares of the Issuer's Common Stock to Kim Capital Partners - KCP, LLC. The Reporting Person and Susan Y. Kim are the managers of JI LLC.