AMKOR TECHNOLOGY, INC. — Director's Dealing 2024

Feb 27, 2024

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMKOR TECHNOLOGY, INC. (AMKR)
CIK: 0001047127
Period of Report: 2024-02-22

Reporting Person: Rutten Guillaume Marie Jean (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2024-02-22	Common Stock	M	10625	$9.48	Acquired	144353	Direct
2024-02-22	Common Stock	M	4375	$14.17	Acquired	148728	Direct
2024-02-22	Common Stock	S	25000	$30.63	Disposed	123728	Direct
2024-02-23	Common Stock	A	10748	—	Acquired	134476	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2024-02-22	Employee Stock Option (Right-to-Buy)	$9.48	M	10625	Disposed	2029-02-15	Common Stock (10625)	Direct
2024-02-22	Employee Stock Option (Right-to-Buy)	$14.17	M	4375	Disposed	2030-07-30	Common Stock (4375)	Direct
2024-02-23	Restricted Stock Units	$0	M	10748	Disposed		Common Stock (10748)	Direct

Footnotes

F1: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 8, 2023.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.40 to $31.00. 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.

F3: On March 17, 2023, the Reporting Person filed a Form 4 which inadvertently reported that the Reporting Person beneficially owned 15,265 2019 Options Shares (as defined below) as of March 15, 2023, instead of 15,625. As of February 22, 2024, the Reporting Person beneficially owned 0 2019 Option Shares.

F4: 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.

F5: 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 vested in equal quarterly installments over three years, such that 100% of the 2020 Option vested on the third anniversary of the 2020 Option Grant Date.

F6: On February 24, 2022 (the "RSU Grant Date"), the Reporting Person was granted 42,992 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 four equal annual installments beginning on the first anniversary of the RSU Grant Date.