2023 - 26 Dec 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Reporting relationship: Member of 10% owner group (2)
Issuer ticker: AMKR
Reported as of: 26 Dec 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 30 Dec 2025, 16:40:11 UTC
Prior SEC filing: 08 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Brian D. Short, Attorney-in-Fact

Key filing fact

2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 filed Form 4 for AMKOR TECHNOLOGY, INC. (AMKR) on 30 Dec 2025.

Key facts

This page summarizes 2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023's Form 4 filing for AMKOR TECHNOLOGY, INC. (AMKR).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 30 Dec 2025, 16:40.

Change

Previous filing in this sequence was filed on 08 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001994714 Primary reporting owner

2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023

Relationship: Member of 10% owner group (2)
Address: C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI
Signature: /s/ Brian D. Short, Attorney-in-Fact
Signature date: 30 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMKR transaction

Common Stock

Gift

Transaction value: $0
Shares: -725,000
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 26 Dec 2025
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

On December 26, 2025, the Reporting Person distributed 725,000 shares of common stock of Amkor, Inc. (the "Issuer") to the Susan Y. Kim 2023 Family Distribution Trust. John T. Kim and James J. Kim are co-trustees of the Susan Y. Kim 2023 Family Distribution Trust.

SEC 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.