Form 4: Amkor Director Susan Kim Reports Major Share Transfers to Trusts

Amkor Technology Director Susan Y. Kim reported the indirect acquisition of over 5.7 million shares of common stock through grantor retained annuity trusts and accrued dividend equivalent units.

Summary

• Susan Y. Kim, a Director and 10% owner of Amkor Technology, Inc. (AMKR), reported changes in her beneficial ownership.
• On December 19, 2025, James J. Kim distributed 3,244,594 shares of Amkor common stock to the 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim. Susan Y. Kim is the sole trustee of this trust.
• On the same date, Agnes C. Kim distributed 2,538,000 shares of Amkor common stock to the 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim. Susan Y. Kim is also the sole trustee of this trust.
• These transactions resulted in Susan Y. Kim indirectly acquiring beneficial ownership of a total of 5,782,594 shares through these two new trusts.
• On December 23, 2025, Susan Y. Kim also acquired 20.0093 Dividend Equivalent Units (DEUs) related to previously granted time-vested restricted stock units (RSUs), following a dividend payment.
• Following these transactions, Susan Y. Kim's total indirect beneficial ownership includes shares held through various entities: Sujochil, LP (19,484,809 shares), Kim Capital Partners KCP, LLC (16,710,668 shares), Sujoda Investments, LP (3,789,479 shares), other family trusts (3,713,610 shares), her own GRATs (1,849,000 shares), James J. Kim 2024 GRAT (1,235,000 shares), and Agnes C. Kim 2024 GRAT (895,000 shares).

Sentiment

Score: 6

Explanation: The transactions primarily involve the transfer of shares into grantor retained annuity trusts (GRATs) for estate planning purposes, which is a neutral event regarding the company's operational performance. The accrual of Dividend Equivalent Units (DEUs) is a positive for the reporting person, reflecting a dividend payment by the company.

Positives

• The reporting person, Susan Y. Kim, indirectly acquired beneficial ownership of 5,782,594 shares of Amkor Technology common stock through newly established grantor retained annuity trusts.
• Susan Y. Kim also accrued 20.0093 Dividend Equivalent Units (DEUs) on her existing Restricted Stock Units (RSUs), indicating a dividend payment by the company.

Future Outlook

NA

Management Comments

• 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.
• The Reporting Person states that 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 filing is specific to an insider's ownership changes and does not provide information on broader industry trends or competitors.

Related Party Transactions

• Distribution of 3,244,594 shares by James J. Kim to the 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim, where Susan Y. Kim is the sole trustee.
• Distribution of 2,538,000 shares by Agnes C. Kim to the 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim, where Susan Y. Kim is the sole trustee.
• Indirect beneficial ownership through Sujochil, LP, where Susan Y. Kim is a general partner.
• Indirect beneficial ownership through Kim Capital Partners KCP, LLC, where Susan Y. Kim is a manager.
• Indirect beneficial ownership through Sujoda Investments, LP, where Susan Y. Kim is a member of Sujoda Management, LLC, the sole general partner.
• Indirect beneficial ownership through various family trusts and GRATs where Susan Y. Kim serves as a trustee or settlor.

Stakeholder Impact

• Shareholders: The transactions represent a significant portion of shares being moved into trusts controlled by a director and 10% owner, potentially consolidating long-term family control over a substantial block of shares. This does not directly impact the company's operations or short-term stock price, but it reinforces the long-term commitment of a major insider.
• Employees, Customers, Suppliers, Creditors: No direct impact is indicated by this filing.

Key Dates

Recommendation

This Form 4 primarily details internal family estate planning transfers of shares into trusts and the accrual of dividend equivalent units. These transactions do not reflect a change in the company's operational performance or a direct market buy/sell decision by the insider. Therefore, based solely on this filing, there is no new information to warrant a change from a 'hold' position for an investor. The shares remain within the family's control, indicating continued long-term interest.

Keywords

Amkor Technology, AMKR, SEC Form 4, Insider Transaction, Beneficial Ownership, Grantor Retained Annuity Trust, GRAT, Dividend Equivalent Units, RSU, Susan Y. Kim, Director, 10% Owner, Stock Transfer, Estate Planning