AMKR

SEC source: 0000899243-22-002803 · doc4.xml · nonDerivative · entry 2

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (7)

10b5-1 filing: Not disclosed

Ownership: Indirect · By James J. Kim 2018-1 GRAT

Disclosed balance after: 626,192

F2 · shares: On October 4, 2021, the Qualified Annuity Trust under the James J. Kim 2018-1 Qualified Annuity Trust Agreement dtd 8/30/18 distributed 626,192 shares of the Issuer's Common Stock to Susan Y. Kim. The reporting person and Susan Y. Kim are the co-trustees of the trust.

F6 · balance_after: Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of the shares held by these trusts and partnerships. 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, or for any other purpose.

SEC source: 0000899243-22-002798 · doc4.xml · nonDerivative · entry 1

KIM JOHN T · CIK 0001158926 · 10% owner · Member of 10% owner group (4)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,777,225

F1 · shares: On October 4, 2021, the Qualified Annuity Trust under the James J. Kim 2018-1 Qualified Annuity Trust Agreement dtd 8/30/18 distributed 626,192 shares of the Issuer's Common Stock to the reporting person.

SEC source: 0000899243-22-002762 · doc4.xml · nonDerivative · entry 1

Qualified Annuity Trust under the James J. Kim 2018-1 Qualified Annuity Trust Agreement dtd 8/30/18 · CIK 0001752917 · Member of 10% owner group (4)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,252,384

F1 · shares: On October 1, 2021, the reporting person distributed 328,350 shares of the Issuer's Common Stock to James J. Kim. The co-trustees of the trust are James J. Kim and Susan Y. Kim.

SEC source: 0000899243-22-002858 · doc4.xml · nonDerivative · entry 3

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Member of 10% owner group (15)

10b5-1 filing: Not disclosed

Ownership: Indirect · By James J. Kim GRAT dtd 8/30/18

Disclosed balance after: 1,252,384

F3 · shares: On October 1, 2021, the Qualified Annuity Trust under the James J. Kim 2018-1 Qualified Annuity Trust Agreement dtd 8/30/18 distributed 328,350 shares of the Issuer's Common Stock to James J. Kim. James J. Kim and the reporting person are the co-trustees of the trust.

F11 · balance_after: Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of these shares. 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, or for any other purpose.

SEC source: 0000899243-21-036872 · doc4.xml · nonDerivative · entry 1

Irrevocable Deed of Trust of Susan Y. Kim dated 4/16/98 For the Benefit of Dylan James Panichello · CIK 0001869340 · See Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On September 20,2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Dylan James Panichello transferred 2,733,334 shares of the Issuer's Common Stock to Dylan Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

F1 · price: On September 20,2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Dylan James Panichello transferred 2,733,334 shares of the Issuer's Common Stock to Dylan Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

SEC source: 0000899243-21-036877 · doc4.xml · nonDerivative · entry 1

Irrevocable Deed of Trust of Susan Y. Kim dated 4/16/98 For the Benefit of Jacqueline Mary Panichello · CIK 0001871193 · See Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Jacqueline Mary Panichello transferred 2,733,333 shares of the Issuer's Common Stock to Jacqueline Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

F1 · price: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Jacqueline Mary Panichello transferred 2,733,333 shares of the Issuer's Common Stock to Jacqueline Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

SEC source: 0000899243-21-043870 · doc4.xml · nonDerivative · entry 1

Trust of Kim Susan Y dated 4/16/98 for the benefit of Alexandra Panichello · CIK 0001289907 · See Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Alexandra Kim Panichello transferred 2,733,333 shares of the Issuer's Common Stock to Alexandra Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

F1 · price: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Alexandra Kim Panichello transferred 2,733,333 shares of the Issuer's Common Stock to Alexandra Investments, LLC in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the limited liability company.

SEC source: 0000899243-22-002768 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,733,333

F1 · shares: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Alexandra Kim Panichello transferred 2,733,333 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

F1 · price: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Alexandra Kim Panichello transferred 2,733,333 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

SEC source: 0000899243-22-002764 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,733,333

F1 · shares: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Jacqueline Mary Panichello transferred 2,733,333 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

F1 · price: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Jacqueline Mary Panichello transferred 2,733,333 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

SEC source: 0000899243-22-002896 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,733,334

F1 · shares: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Dylan James Panichello transferred 2,733,334 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

F1 · price: On September 20, 2021, the Susan Y. Kim Irrevocable Trust Dated 4/16/98 fbo Dylan James Panichello transferred 2,733,334 shares of the Issuer's Common Stock to the reporting person in exchange for 100% of the latter's Units. Susan Y. Kim and John T. Kim are the co-trustees of the trust. Susan Y. Kim and Liam E. Blaney are the managers of the reporting person.

SEC source: 0001209191-21-056901 · doc4.xml · derivative · entry 5

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 149,500

Underlying: Common Stock · 500 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.

F4 · derivative.exercise_date: This stock option (the "2019 Option") to acquire 150,000 shares of the Issuer's common stock (the "2019 Option Shares") was granted on February 15, 2019 (the "2019 Grant Date") and vests over four years as follows: (i) with respect to 25% of the 2019 Option Shares, on the first anniversary of the 2019 Grant Date; and (ii) with respect to the remainder of the 2019 Option Shares, in equal quarterly installments thereafter, such that 100% of the 2019 Option will vest on the fourth anniversary of the 2019 Grant Date.

SEC source: 0001209191-21-056901 · doc4.xml · derivative · entry 4

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,500 shares

Expires 2026-09-12

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 "2016 Option") to acquire 75,000 shares of the Issuer's common stock (the "2016 Option Shares") was granted on September 12, 2016 (the "2016 Grant Date") and vested over four years as follows: (i) with respect to 25% of the 2016 Option Shares, on the first anniversary of the 2016 Grant Date; and (ii) with respect to the remainder of the 2016 Option Shares, in equal quarterly installments thereafter, such that 100% of the 2016 Option became vested on the fourth anniversary of the 2016 Grant Date.

SEC source: 0001209191-21-056901 · doc4.xml · nonDerivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,844

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 11, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.45 to $28.73.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: 0001209191-21-056901 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,844

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: 0001209191-21-056901 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,344

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: 0001209191-21-056759 · doc4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 272,500

Underlying: Common Stock · 10,000 shares

Expires 2030-07-30

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.

F3 · derivative.exercise_date: This stock option (the "Option") to acquire 375,000 shares of the Issuer's common stock was granted on July 30, 2020 (the "Grant Date") and will vest in equal quarterly installments over three years, such that 100% of the Option will be vested on the third anniversary of the Grant Date.

SEC source: 0001209191-21-056759 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 365,000

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 May 13, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.27 to $28.82.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: 0001209191-21-056759 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 390,000

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: 0000899243-21-036062 · doc4.xml · nonDerivative · entry 1

Qualified Annuity Trust under the James J. Kim 2020-1 Annuity Trust Agreement dated 04/01/2020 · CIK 0001845367 · Exhibit 99.1

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,401,123

F1 · shares: On September 1, 2021, the James J. Kim 2020-1 Qualified Annuity Trust Under the James J. Kim 2020-1 Qualified Annuity Trust Agreement Dated 04/01/2020 distributed 163,200 shares of the Issuer's Common Stock to James J. Kim. The co-trustees of such trust are James J. Kim and Susan Y. Kim.

SEC source: 0000899243-22-002858 · doc4.xml · nonDerivative · entry 2

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Member of 10% owner group (15)

10b5-1 filing: Not disclosed

Ownership: Indirect · By James J. Kim GRAT dtd 4/1/20

Disclosed balance after: 1,401,123

F2 · shares: On September 1, 2021, the James J. Kim 2020-1 Qualified Annuity Trust under the James J. Kim 2020-1 Qualified Annuity Trust Agreement dated 04/01/2021 distributed 163,200 shares of the Issuer's Common Stock to James J. Kim. James J. Kim and the reporting person are the co-trustees of the trust. James J. Kim and the reporting person are father and daughter.

F11 · balance_after: Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of these shares. 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, or for any other purpose.

SEC source: 0001209191-21-053708 · doc4.xml · derivative · entry 4

Stone John Charles · CIK 0001581432 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,250

Underlying: Common Stock · 9,375 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 "Grant Date") and vests over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option will vest on the fourth anniversary of the Grant Date.

SEC source: 0001209191-21-053708 · doc4.xml · nonDerivative · entry 2

Stone John Charles · CIK 0001581432 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,552

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.30 to $26.37. 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: 0001209191-21-053708 · doc4.xml · nonDerivative · entry 1

Stone John Charles · CIK 0001581432 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,927

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: 0001209191-21-052649 · doc4.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,500

Underlying: Common Stock · 5,000 shares

Expires 2026-09-12

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 75,000 shares of the Issuer's common stock (the "Option Shares") was granted on September 12, 2016 (the "Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option became vested on the fourth anniversary of the Grant Date.

SEC source: 0001209191-21-052649 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,844

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 11, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $23.84 to $24.11.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: 0001209191-21-052649 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,844

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: 0001209191-21-052258 · doc4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 282,500

Underlying: Common Stock · 10,000 shares

Expires 2030-07-30

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.

F3 · derivative.exercise_date: This stock option (the "Option") to acquire 375,000 shares of the Issuer's common stock was granted on July 30, 2020 (the "Grant Date") and will vest in equal quarterly installments over three years, such that 100% of the Option will be vested on the third anniversary of the Grant Date.

SEC source: 0001209191-21-052258 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 380,000

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 13, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $25.73 to $26.18.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: 0001209191-21-052258 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 405,000

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: 0001209191-21-050224 · doc4.xml · derivative · entry 3

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2023-05-08

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: 0001209191-21-050224 · doc4.xml · nonDerivative · entry 2

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,583

F1 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.72 to $27.32.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: 0001209191-21-050224 · doc4.xml · nonDerivative · entry 1

Carolin Roger Anthony · CIK 0001351909 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,583

SEC source: 0001209191-21-049983 · doc4.xml · nonDerivative · entry 1

McCourt MaryFrances · CIK 0001730724 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,092

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.89 to $27.05. 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: 0001209191-21-049717 · doc4.xml · derivative · entry 3

McCourt MaryFrances · CIK 0001730724 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2030-05-19

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 to acquire 20,000 shares of the Issuer's common stock was granted on May 19, 2020 and became fully vested on May 18, 2021.

SEC source: 0001209191-21-049717 · doc4.xml · nonDerivative · entry 2

McCourt MaryFrances · CIK 0001730724 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,592

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.17 to $25.39. 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: 0001209191-21-049717 · doc4.xml · nonDerivative · entry 1

McCourt MaryFrances · CIK 0001730724 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,592

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: 0001209191-21-048970 · doc4.xml · nonDerivative · entry 1

Tily Gil C. · CIK 0001405591 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 129,218

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.47 to $24.79. 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: 0001209191-21-046964 · doc4.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 292,500

Underlying: Common Stock · 10,000 shares

Expires 2030-07-30

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.

F4 · derivative.exercise_date: This stock option (the "Option") to acquire 375,000 shares of the Issuer's common stock was granted on July 30, 2020 (the "Grant Date") and will vest in equal quarterly installments over three years, such that 100% of the Option will be vested on the third anniversary of the Grant Date.

SEC source: 0001209191-21-046964 · doc4.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 395,000

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 13, 2021.

F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $23.19 to $23.94.The Reporting Person hereby undertakes to provide, upon request, to the staff of the SEC, 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 (3) to this Form 4.

SEC source: 0001209191-21-046964 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 395,595

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 13, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $22.19 to $23.18. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission (the "SEC"), 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: 0001209191-21-046964 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 420,000

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: 0001209191-21-046963 · doc4.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,500

Underlying: Common Stock · 5,000 shares

Expires 2026-09-12

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 75,000 shares of the Issuer's common stock (the "Option Shares") was granted on September 12, 2016 (the "Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option became vested on the fourth anniversary of the Grant Date.

SEC source: 0001209191-21-046963 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,844

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 11, 2021.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $22.20 to $23.21.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: 0001209191-21-046963 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,844

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: 0000899243-22-002821 · doc4.xml · nonDerivative · entry 1

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (6)

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 75,633,824

F1 · shares: On July 14, 2021, the Qualified Annuity Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement Dated 04/01/20 distributed 271,895 shares of the Issuer's Common Stock to Susan Y. Kim. Susan Y. Kim and James J. Kim are the co-trustees of the trust. James J. Kim and Susan Y. Kim are father and daughter. James J. Kim is the spouse of the reporting person.

F5 · 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, or for any other purpose.

SEC source: 0000899243-22-002810 · doc4.xml · nonDerivative · entry 1

Qualified Annuity Trust under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement dated 04/01/2020 · CIK 0001845366 · Member of 10% owner group (2)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,728,105

F1 · shares: On July 14, 2021, 271,895 shares of the Issuer's Common stock were distributed to Susan Y. Kim by the reporting person. Susan Y. Kim and James J. Kim are the co-trustees of the trust.

SEC source: 0000899243-22-002803 · doc4.xml · nonDerivative · entry 1

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (7)

10b5-1 filing: Not disclosed

Ownership: Indirect · By Susan Y. Kim 2020-1 GRAT

Disclosed balance after: 2,728,105

F1 · shares: On July 14, 2021, the Qualified Annuity Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement Dated 04/01/20 distributed 271,895 shares of the Issuer's Common Stock to Susan Y. Kim. Susan Y. Kim and the reporting person are the co-trustees of the trust. The reporting person and Susan Y. Kim are father and daughter.

F6 · balance_after: Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of the shares held by these trusts and partnerships. 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, or for any other purpose.

SEC source: 0000899243-22-002747 · doc4.xml · nonDerivative · entry 1

John T. Kim 2018 Irrevocable Trust Agreement Dated 2/6/18 · CIK 0001732522 · Member of 10% owner group (2)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,028,132

F1 · shares: On July 1, 2021, 174,810 shares of the Issuer's Common Stock were distributed to John T. Kim by the reporting person. John T. Kim and Susan Y. Kim are the co-trustees of the trust.

SEC source: 0000899243-22-002858 · doc4.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Member of 10% owner group (15)

10b5-1 filing: Not disclosed

Ownership: Indirect · By John T. Kim GRAT dtd 2/6/18

Disclosed balance after: 1,028,132

F1 · shares: On July 1, 2021, the John T. Kim 2018 Qualified Annuity Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 distributed 174,810 shares of the Issuer's Common Stock to John T. Kim. John T. Kim and the reporting person are the co-trustees of the trust. John T. Kim and the reporting person are siblings. The reporting person inadvertently omitted the 1,028,132 shares of the Issuer's Common Stock held by the John T. Kim GRAT dtd 2/6/18 from her indirect holdings reported on her Form 4 filed with the Commission on January 4, 2022.

F1 · balance_after: On July 1, 2021, the John T. Kim 2018 Qualified Annuity Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 distributed 174,810 shares of the Issuer's Common Stock to John T. Kim. John T. Kim and the reporting person are the co-trustees of the trust. John T. Kim and the reporting person are siblings. The reporting person inadvertently omitted the 1,028,132 shares of the Issuer's Common Stock held by the John T. Kim GRAT dtd 2/6/18 from her indirect holdings reported on her Form 4 filed with the Commission on January 4, 2022.

F11 · balance_after: Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of these shares. 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, or for any other purpose.

SEC source: 0001209191-21-043704 · doc4.xml · derivative · entry 4

Stone John Charles · CIK 0001581432 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,625

Underlying: Common Stock · 9,375 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 was granted on February 15, 2019 and will vest over four years as follows: 25% on the first anniversary of the grant date and 1/16 of the option will vest each quarter thereafter so that at the end of the fourth year, 100% of the option will be vested.