Form 4: Amkor Director Susan Kim Reports Ownership Form Change

Amkor Technology Director Susan Y. Kim reported a change in the form of her beneficial ownership of 758,000 common shares, moving them from indirect to direct ownership via a GRAT distribution.

Summary

• Susan Y. Kim, a Director and 10% Owner of Amkor Technology, Inc. (AMKR), reported a transaction on December 4, 2025.
• The transaction involved a gift distribution of 758,000 shares of Amkor Common Stock from the Susan Y. Kim 2023 Grantor Retained Annuity Trust (GRAT) to the Reporting Person.
• This event is a change in the form of ownership from indirect (via the GRAT) to direct, with no net change in the Reporting Person's total beneficial ownership.
• Following the transaction, Susan Y. Kim directly owns 6,090,494 shares of Common Stock.
• Indirect beneficial ownership includes 1,849,000 shares via her own GRATs, 19,484,809 shares via Sujochil, LP, 16,710,668 shares via Kim Capital Partners KCP, LLC, 3,789,479 shares via Sujoda Investments, LP, 3,713,610 shares via other trusts (excluding GRATs), 2,200,000 shares via James J. Kim 2024 GRAT, and 1,600,000 shares via Agnes C. Kim 2024 GRAT.
• The total beneficial ownership reported by Susan Y. Kim, including both direct and indirect holdings, is 53,438,050 shares.

Sentiment

Score: 5

Explanation: Neutral. This Form 4 reports a change in the form of beneficial ownership for an insider, not a new acquisition or disposition that would indicate a change in sentiment towards the company's prospects.

Future Outlook

This filing does not contain any forward-looking statements or guidance.

Management Comments

• The Reporting Person disclaims beneficial ownership of these securities, except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that she is the beneficial owner of such securities, except to the extent of her pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ('Section 16'), or for any other purpose.
• The filing of this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities owned by the other members of the group, for the purpose of Section 16 or for any other purpose.

Industry Context

This insider transaction report does not provide information related to broader industry trends or competitors.

Related Party Transactions

• The reported transaction involves a distribution from the Susan Y. Kim 2023 Grantor Retained Annuity Trust (GRAT), where the Reporting Person is the annuitant and sole trustee.
• Indirect beneficial ownership includes shares held by various trusts for the benefit of immediate family members, as well as other GRATs.
• The Reporting Person holds roles as a general partner of Sujochil, LP, a manager of Kim Capital Partners KCP, LLC, and a member of Sujoda Management, LLC, all of which hold significant shares of the Issuer.

Stakeholder Impact

• Neutral impact on shareholders as this is a change in the form of ownership for an existing insider holding, not a market transaction.

Key Dates

Keywords

Amkor Technology, AMKR, Susan Y. Kim, Form 4, SEC filing, beneficial ownership, insider transaction, director, 10% owner, GRAT