James J. Kim - Nov 21, 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
Stock symbol
AMKR
Transactions as of
Nov 21, 2025
Transactions value $
$0
Form type
4
Date filed
11/24/2025, 08:58 PM
Previous filing
Aug 5, 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 2025-11-24 0001158839

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Gift $0 +965K $0.00 965K Nov 21, 2025 By trusts (excluding GRATs) F1
holding AMKR Common Stock 2.34M Nov 21, 2025 Direct
holding AMKR Common Stock 1.83M Nov 21, 2025 By Spouse F2, F3
holding AMKR Common Stock 1.96M Nov 21, 2025 By John T. Kim G-S Trust dtd. 12/11/12 F2, F3
holding AMKR Common Stock 165K Nov 21, 2025 By self as Trustee of Trust U/A dtd. 12/11/12 F2, F3
holding AMKR Common Stock 7.83M Nov 21, 2025 By John T. Kim Family 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 November 20, 2025, the 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024 distributed 965,000 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18. The Reporting Person and Susan Y. Kim are co-trustees of the trust.
F2 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.
F3 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.

Remarks:

2. 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.