James J. Kim - 26 Dec 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
Member of 10% owner group (4), 10%+ Owner
Signature
/s/ Brian D. Short, Attorney-in-Fact for James J. Kim
Issuer symbol
AMKR
Transactions as of
26 Dec 2025
Net transactions value
$0
Form type
4
Filing time
30 Dec 2025, 16:40:16 UTC
Previous filing
23 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
KIM JAMES J Member of 10% owner group (4), 10%+ Owner C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI /s/ Brian D. Short, Attorney-in-Fact for James J. Kim 30 Dec 2025 0001158839

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Gift $0 +725,000 $0.000000 725,000 26 Dec 2025 Susan Y. Kim 2023 Family Distribution Trust F1, F2, F3
holding AMKR Common Stock 61,645 26 Dec 2025 Direct
holding AMKR Common Stock 7,828,682 26 Dec 2025 By John T. Kim Family Trust U/A dtd. 12/11/12 F2, F3
holding AMKR Common Stock 1,957,350 26 Dec 2025 By John T. Kim G-S Trust dtd. 12/11/12 F2, F3
holding AMKR Common Stock 164,678 26 Dec 2025 By self as Trustee of Trust U/A dtd. 12/11/12 F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On December 26, 2025, the 2023 Grantor Retained Annuity Trust dated 9/15/2023 distributed 725,000 shares of common stock of Amkor, Inc. (the "Issuer") to the Susan Y. Kim 2023 Family Distribution Trust. Susan Y. Kim is the trustee of the 2023 Grantor Retained Annuity Trust Dated 9/15/2023. The Reporting Person and John T. Kim are co-trustees of the Susan Y. Kim 2023 Family Distribution Trust.
F2 The Reporting Person is (i) a trustee of trusts for the benefit of his immediate family members which own 9,786,032 shares of the Issuer's Common Stock (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.
F3 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.

Remarks:

(4) 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.