AMKOR TECHNOLOGY, INC. — Director's Dealing 2023

Feb 21, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMKOR TECHNOLOGY, INC. (AMKR)
CIK: 0001047127
Period of Report: 2023-02-16

Reporting Person: Shin Sung (Executive Vice President)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-02-16	Restricted Stock Units	$	A	3247	Acquired		Common Stock (3247)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1634	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Restricted Stock Units	$		Common Stock ()	1634	Direct
Restricted Stock Units	$		Common Stock ()	3761	Direct

Footnotes

F1: As previously reported in a Form 3 filed by the Reporting Person on March 17, 2021 (the "Form 3"), on February 11, 2021 (the "2021 Grant Date"), 3,268 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 Form 3 and in subsequent Forms 4 filed by the Reporting Person, the 2021 RSUs were incorrectly reported in Table I. On February 10, 2023, 817 of the 2021 RSUs vested, and such vested RSUs are properly reported in Table I of this Form 4. Table I, Column 5 and Table II, Column 9 of this Form 4 have been adjusted to include the remaining vested and unvested 2021 RSUs, respectively, and reflect the proper number of 2021 RSUs beneficially owned by the Reporting Person as of the filing of this Form 4.

F2: As previously reported in a Form 4 filed by the Reporting Person on February 25, 2022 (the "Original Form 4"), on February 24, 2022 (the "2022 Grant Date"), 3,761 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 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 of this Form 4.

F3: 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.