Agnes C. Kim - Nov 20, 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role: Member of 10% owner group (3)
Signature: /s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim
Stock symbol: AMKR
Transactions as of: Nov 20, 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 AGNES C	Member of 10% owner group (3)	C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI	/s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim	2025-11-24	0001158840

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMKR	Common Stock	Gift	$0	+705K		$0.00	705K	Nov 20, 2025	By trusts	F1
holding	AMKR	Common Stock						12.3M	Nov 20, 2025	By Spouse	F2

* 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 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, of which the Reporting Person is the settlor, sole trustee, and sole beneficiary. Susan Y. Kim is the sole trustee of the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024.
F2	James J. Kim is the spouse of the Reporting Person. 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.

Content

On November 20, 2025, 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, of which the Reporting Person is the settlor, sole trustee, and sole beneficiary. Susan Y. Kim is the sole trustee of the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024.

James J. Kim is the spouse of the Reporting Person. 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.