SEC Form 4 · accession 0001158839-26-000001

AMKOR TECHNOLOGY, INC. · AMKR

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

James J Kim

10% Owner · Other

Period of report

Jul 20, 2026

Accepted (ET)

Jul 22, 2026 · 4:32 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0001047127

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock	Jul 20, 2026	M	200,000	$9.86	A	261,645	D
Common Stock	Jul 20, 2026	M	250,000	$9.48	A	511,645	D
Common Stock^F1,F2	holding	—	—		—	725,000	I	Susan Y. Kim 2023 Family Distribution Trust
Common Stock^F1,F2	holding	—	—		—	7,828,682	I	By John T. Kim Family Trust U/A dtd. 12/11/12
Common Stock^F1,F2	holding	—	—		—	1,957,350	I	By John T. Kim G-S Trust dtd. 12/11/12
Common Stock^F1,F2	holding	—	—		—	164,678	I	By self as Trustee of Trust U/A dtd. 12/11/12

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Employee Stock Option (Right-to-Buy)^F3	$9.86	Jul 20, 2026	M	200,000	D	Feb 27, 2021	Oct 31, 2026	Common Stock	200,000	0	D
Employee Stock Option (Right-to-Buy)^F4	$9.48	Jul 20, 2026	M	250,000	D	Feb 15, 2023	Oct 31, 2026	Common Stock	250,000	0	D

Explanation of responses

F1The Reporting Person is (i) a trustee of trusts for the benefit of his immediate family members which own 10,511,032 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") and (ii) a trustee of a trust which is a controlling member of a limited liability company being treated as a corporation for purposes of Section 16, which limited liability company holds 164,678 shares of the Issuer's Common stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.
F2The 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.
F3This stock option (the "2017 Option") to acquire 200,000 shares of the Issuer's Common Stock (the "2017 Option Shares") was granted on February 27, 2017 (the "2017 Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the 2017 Option Shares, on the first anniversary of the 2017 Option Grant Date; and (ii) with respect to the remainder of the 2017 Option Shares, in equal quarterly installments thereafter, such that 100% of the 2017 Option vested on the fourth anniversary of the 2017 Option Grant Date.
F4This stock option (the "2019 Option") to acquire 250,000 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.

Remarks

(5) 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.