AMKR

SEC source: 0001209191-23-010756 · doc4.xml · derivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,679

Underlying: Common Stock · 55,679 shares

Expires not disclosed

F5 · derivative.exercise_price: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F5 · derivative.exercise_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F5 · derivative.expiration_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

SEC source: 0001209191-23-010752 · doc4.xml · derivative · entry 4

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,423

Underlying: Common Stock · 7,423 shares

Expires not disclosed

F4 · derivative.exercise_price: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F4 · derivative.exercise_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F4 · derivative.expiration_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

SEC source: 0001209191-23-010748 · doc4.xml · derivative · entry 4

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,703

Underlying: Common Stock · 16,703 shares

Expires not disclosed

F4 · derivative.exercise_price: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F4 · derivative.exercise_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

F4 · derivative.expiration_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.

SEC source: 0001209191-23-010748 · doc4.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,500

Underlying: Common Stock · 6,000 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: 0001209191-23-010748 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,605

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 10, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.89 to $27.24. 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 (2) to this Form 4.

SEC source: 0001209191-23-010748 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,605

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: 0001209191-23-011317 · doc4.xml · derivative · entry 4

Shin Sung · CIK 0001851258 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,247

Underlying: Common Stock · 3,247 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 16, 2023 (the "2023 Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "2023 RSUs"). The 2023 RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in four equal annual installments beginning on the first anniversary of the 2023 Grant Date.

F3 · derivative.exercise_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "2023 Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "2023 RSUs"). The 2023 RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in four equal annual installments beginning on the first anniversary of the 2023 Grant Date.

F3 · derivative.expiration_date: Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "2023 Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "2023 RSUs"). The 2023 RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in four equal annual installments beginning on the first anniversary of the 2023 Grant Date.

SEC source: 0001209191-23-011312 · doc4.xml · derivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,567

Underlying: Common Stock · 5,567 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

F1 · derivative.exercise_date: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

F1 · derivative.expiration_date: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-011314 · doc4.xml · derivative · entry 1

ROGERS MARK N · CIK 0001201997 · EVP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,423

Underlying: Common Stock · 7,423 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

F1 · derivative.exercise_date: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

F1 · derivative.expiration_date: Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units granted on February 16, 2023 (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 four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-010980 · doc4.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 9,279

Underlying: Common Stock · 9,279 shares

Expires not disclosed

F1 · derivative.exercise_price: The transaction represents shares of Common Stock of Amkor Technology Inc. (the "Issuer") underlying time-vested restricted stock units granted to the Reporting Person's spouse on February 16, 2023 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the services of the Reporting Person's spouse as an employee of the Issuer and will vest in four equal installments beginning on the first anniversary of the Grant Date.

F1 · derivative.exercise_date: The transaction represents shares of Common Stock of Amkor Technology Inc. (the "Issuer") underlying time-vested restricted stock units granted to the Reporting Person's spouse on February 16, 2023 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the services of the Reporting Person's spouse as an employee of the Issuer and will vest in four equal installments beginning on the first anniversary of the Grant Date.

F1 · derivative.expiration_date: The transaction represents shares of Common Stock of Amkor Technology Inc. (the "Issuer") underlying time-vested restricted stock units granted to the Reporting Person's spouse on February 16, 2023 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the services of the Reporting Person's spouse as an employee of the Issuer and will vest in four equal installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-010756 · doc4.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,500

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

SEC source: 0001209191-23-010756 · 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: 20,625

Underlying: Common Stock · 5,000 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 "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 Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the 2019 Option Shares, on the first anniversary of the 2019 Option 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 vested on the fourth anniversary of the 2019 Option Grant Date.

SEC source: 0001209191-23-010756 · 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: 140,000

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 26, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.64 to $27.25. 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: 0001209191-23-010756 · 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: 170,000

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: 0001209191-23-010756 · 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: 160,000

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: 0001209191-23-010752 · doc4.xml · derivative · entry 3

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,250 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 100,000 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: 0001209191-23-010752 · doc4.xml · nonDerivative · entry 2

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 794

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 September 1, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.64 to $27.10.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: 0001209191-23-010752 · doc4.xml · nonDerivative · entry 1

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,044

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: 0001209191-23-009558 · doc4.xml · derivative · entry 4

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (4)

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 5,446

Underlying: Common Stock · 2,630 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_date: On the Grant Date, the Reporting Person's spouse was granted 10,893 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's spouse was granted 10,893 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-009558 · doc4.xml · nonDerivative · entry 2

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (4)

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 69,409,857

F2 · kind: The transaction represents shares of Common Stock of Amkor Technology, Inc. (the "Issuer") withheld by the Issuer in connection with the vesting of certain restricted stock units ("RSUs") granted to the Reporting Person's spouse 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. The shares were withheld to satisfy tax withholding obligations of the Reporting Person's spouse. The Issuer will pay these taxes on behalf of the Reporting Person's spouse.

F1 · 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.

SEC source: 0001209191-23-009558 · doc4.xml · nonDerivative · entry 1

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (4)

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 69,410,938

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: 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: 0001209191-23-009533 · doc4.xml · derivative · entry 3

ROGERS MARK N · CIK 0001201997 · EVP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,268

Underlying: Common Stock · 1,634 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_date: As previously reported in a Form 4 filed by the Reporting Person on February 18, 2021 (the "Original 2021 Form 4"), on February 11, 2021 (the "2021 Grant Date"), 6,536 shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "2021 RSUs") were granted to the Reporting Person. The 2021 RSUs vest in four equal annual installments beginning on the first anniversary of the 2021 Grant Date. In the Original 2021 Form 4 and in subsequent Form 4s filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2021 RSUs and reflects the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4.

F1 · derivative.expiration_date: As previously reported in a Form 4 filed by the Reporting Person on February 18, 2021 (the "Original 2021 Form 4"), on February 11, 2021 (the "2021 Grant Date"), 6,536 shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "2021 RSUs") were granted to the Reporting Person. The 2021 RSUs vest in four equal annual installments beginning on the first anniversary of the 2021 Grant Date. In the Original 2021 Form 4 and in subsequent Form 4s filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2021 RSUs and reflects the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4.

F1 · balance_after: As previously reported in a Form 4 filed by the Reporting Person on February 18, 2021 (the "Original 2021 Form 4"), on February 11, 2021 (the "2021 Grant Date"), 6,536 shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "2021 RSUs") were granted to the Reporting Person. The 2021 RSUs vest in four equal annual installments beginning on the first anniversary of the 2021 Grant Date. In the Original 2021 Form 4 and in subsequent Form 4s filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2021 RSUs and reflects the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4.

SEC source: 0001209191-23-009533 · doc4.xml · nonDerivative · entry 2

ROGERS MARK N · CIK 0001201997 · EVP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,398

F3 · kind: The transaction represents shares withheld by the Issuer in connection with the vesting of certain of the 2021 RSUs. 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: 0001209191-23-009533 · doc4.xml · nonDerivative · entry 1

ROGERS MARK N · CIK 0001201997 · EVP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,185

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: As previously reported in a Form 4 filed by the Reporting Person on February 18, 2021 (the "Original 2021 Form 4"), on February 11, 2021 (the "2021 Grant Date"), 6,536 shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units (the "2021 RSUs") were granted to the Reporting Person. The 2021 RSUs vest in four equal annual installments beginning on the first anniversary of the 2021 Grant Date. In the Original 2021 Form 4 and in subsequent Form 4s filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2021 RSUs and reflects the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4.

F2 · balance_after: As previously reported in a Form 4 filed by the Reporting Person on February 25, 2022 (the "Original 2022 Form 4"), on February 24, 2022 (the "2022 Grant Date") shares of the Issuer's common stock underlying time-vested restricted stock units (the "2022 RSUs") were granted to the Reporting Person. The 2022 RSUs vest in four equal annual installments beginning on the first anniversary of the 2022 Grant Date. In the Original 2022 Form 4, the 2022 RSUs were incorrectly reported in Table I. Table II, Column 9 of this Form 4 has been adjusted to include the 2022 RSUs and reflects the proper number of 2022 RSUs beneficially owned by the Reporting Person as of the filing date of this Form 4.

SEC source: 0001209191-23-009532 · doc4.xml · derivative · entry 11

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (5)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,446

Underlying: Common Stock · 2,630 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 Grant Date, the Reporting Person was granted 10,893 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

F4 · derivative.expiration_date: On the Grant Date, the Reporting Person was granted 10,893 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-009532 · doc4.xml · nonDerivative · entry 2

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (5)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,714,899

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: 0001209191-23-009532 · doc4.xml · nonDerivative · entry 1

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (5)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,715,980

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: 0001209191-23-009529 · doc4.xml · derivative · entry 3

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,361

Underlying: Common Stock · 657 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 2,723 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 2,723 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-009529 · doc4.xml · nonDerivative · entry 2

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 794

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: 0001209191-23-009529 · doc4.xml · nonDerivative · entry 1

Haghighi Farshad · CIK 0001887579 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,091

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: 0001209191-23-009527 · doc4.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,812

Underlying: Common Stock · 1,906 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 7,625 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 7,625 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

SEC source: 0001209191-23-009527 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,605

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: 0001209191-23-009527 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,418

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: 0001209191-23-009524 · doc4.xml · derivative · entry 3

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,634

Underlying: Common Stock · 817 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: 0001209191-23-009524 · doc4.xml · nonDerivative · entry 2

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 982

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: 0001209191-23-009524 · doc4.xml · nonDerivative · entry 1

Engel Kevin · CIK 0001965254 · Executive Vice President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,342

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: 0001209191-23-009928 · doc4.xml · nonDerivative · entry 1

KIM AGNES C · CIK 0001158840 · Member of 10% owner group (3)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,278,001

F1 · shares: On February 9, 2023 the Agnes C. Kim 2020-1 Qualified Annuity Trust U/A dated 12/16/20 distributed 667,225 shares of the Common Stock of Amkor Technology, Inc. to the Reporting Person.

SEC source: 0001209191-23-009923 · doc4.xml · nonDerivative · entry 1

Agnes C. Kim 2020-1 Qualified Annuity Trust Under Agreement Dated 12/16/20 · CIK 0001837174 · Member of 10% owner group (2)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,660,840

F1 · shares: On February 9, 2023 the Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 distributed 667,225 shares of the Common Stock of Amkor Technology, Inc. to Agnes C. Kim. Susan Y. Kim is the sole trustee of such trust.

SEC source: 0001209191-23-009926 · doc4.xml · nonDerivative · entry 1

James J. Kim 2021 Qualified Annuity Trust U/A Dated 12/15/2021 · CIK 0001906235 · Member of 10% owner group (2)

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,867,747

F1 · shares: On February 9, 2023 the Reporting Person distributed 485,600 shares of the Common Stock of Amkor Technology, Inc. to James J. Kim. James J. Kim and Susan Y. Kim are the co-trustees of the trust.

SEC source: 0001209191-23-009975 · doc4.xml · nonDerivative · entry 2

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Member of 10% owner group (7)

10b5-1 filing: Not disclosed

Ownership: Indirect · By Agnes C. Kim 2020-1 GRAT dtd 12/16/20

Disclosed balance after: 2,660,840

F5 · shares: On February 9, 2023, the Agnes C. Kim 2020-1 Qualified Annuity Trust U/A dated 12/16/20 (the "ACK Trust") distributed 667,225 shares of the Common Stock of the Issuer to Agnes C. Kim. The Reporting Person is the sole trustee of the ACK Trust and the daughter of Agnes C. Kim.

F2 · balance_after: The Reporting Person is (i) a trustee of trusts for the benefit of her immediate family members (other than grantor retained annuity trusts ("GRATs")) which own 9,181,498 shares of the Issuer's Common Stock, (ii) a trustee of GRATs for the benefit of members of her immediate family which own 6,399,442 shares of the Issuer's Common Stock, (iii) a trustee of GRATs of which the Reporting Person was the settlor and is the sole annuitant which own 3,678,298 shares of the Issuer's Common Stock, (iv) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock,

F3 · balance_after: (Continued from Footnote 2) (v) a manager of limited liability companies being treated as corporations for purposes of Section 16, which own 8,200,000 shares of the Issuer's Common Stock and (vi) as referenced in footnote 6, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

F4 · 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 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

SEC source: 0001209191-23-009975 · doc4.xml · nonDerivative · entry 1

KIM SUSAN Y · CIK 0001158922 · Director · 10% owner · Member of 10% owner group (7)

10b5-1 filing: Not disclosed

Ownership: Indirect · By James J. Kim 2021 GRAT dtd 12/15/21

Disclosed balance after: 1,867,747

F1 · shares: On February 9, 2023, the James J. Kim 2021 Qualified Annuity Trust Dated 12/15/21 (the "JJK Trust") distributed 485,600 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to James J. Kim. The Reporting Person is a trustee of the JJK Trust and the daughter of James J. Kim.

F2 · balance_after: The Reporting Person is (i) a trustee of trusts for the benefit of her immediate family members (other than grantor retained annuity trusts ("GRATs")) which own 9,181,498 shares of the Issuer's Common Stock, (ii) a trustee of GRATs for the benefit of members of her immediate family which own 6,399,442 shares of the Issuer's Common Stock, (iii) a trustee of GRATs of which the Reporting Person was the settlor and is the sole annuitant which own 3,678,298 shares of the Issuer's Common Stock, (iv) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock,

F3 · balance_after: (Continued from Footnote 2) (v) a manager of limited liability companies being treated as corporations for purposes of Section 16, which own 8,200,000 shares of the Issuer's Common Stock and (vi) as referenced in footnote 6, a member of Sujoda Management, LLC, which indirectly owns 2,478,325 shares of the Issuer's Common Stock. Pursuant to Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

F4 · 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 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

SEC source: 0001209191-23-009973 · doc4.xml · nonDerivative · entry 1

KIM JAMES J · CIK 0001158839 · Director · 10% owner · Member of 10% owner group (5)

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 3,278,001

F1 · shares: On February 9, 2023, the Agnes C. Kim 2020-1 Qualified Annuity Trust U/A Dated 12/16/20 distributed 667,225 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to Agnes C. Kim. Agnes C. Kim is the spouse of the Reporting Person.

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.

SEC source: 0001209191-23-004297 · doc4.xml · derivative · entry 3

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,500

Underlying: Common Stock · 6,000 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 "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: 0001209191-23-004297 · doc4.xml · nonDerivative · entry 2

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,512

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 10, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.86 to $29.62. 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: 0001209191-23-004297 · doc4.xml · nonDerivative · entry 1

Faust Megan · CIK 0001684564 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,512

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: 0001209191-23-004047 · doc4.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 132,500

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

SEC source: 0001209191-23-004047 · 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: 25,625

Underlying: Common Stock · 5,000 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 "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: 0001209191-23-004047 · 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: 155,000

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 26, 2022.

F2 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.30 to $31.09. 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: 0001209191-23-004047 · 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: 185,000

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: 0001209191-23-004047 · 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: 175,000

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.