Agnes C. Kim - 19 Dec 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
Member of 10% owner group (4)
Signature
/s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim
Issuer symbol
AMKR
Transactions as of
19 Dec 2025
Net transactions value
$0
Form type
4
Filing time
23 Dec 2025, 19:01:21 UTC
Previous filing
24 Nov 2025
Next filing
30 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
KIM AGNES C Member of 10% owner group (4) C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI /s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim 23 Dec 2025 0001158840

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Gift $0 -2,538,000 -100% $0.000000 0 19 Dec 2025 Direct F1, F2
transaction AMKR Common Stock Gift $0 -3,244,594 -24% $0.000000 10,012,355 19 Dec 2025 By Spouse F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On November 24, 2025, the Reporting Person reported that the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024 distributed 705,000 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to the Agnes C. Kim Revocable Trust dtd 08/30/2018. These shares were inadvertently reported as being held indirectly by the Agnes C. Kim Revocable Trust dtd 08/30/2018 on a Form 4 filed by the Reporting Person on November 24, 2025. These shares were direct holdings of the Reporting Person, as the Reporting Person is the settlor, sole trustee, and sole beneficiary of such trust.
F2 On December 19, 2025, the Reporting Person made a distribution of 2,538,000 shares of common stock of the Issuer to the 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim. Susan Y. Kim is the sole trustee of the 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim.
F3 On December 19, 2025, the spouse of the Reporting Person, James J. Kim, made a distribution of 3,244,594 shares of common stock of the Issuer to the 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim. Susan Y. Kim is the sole trustee of the 2025 Grantor Retained Annuity Trust No.1 of James J. Kim.

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.