Amkor Tech SEC Filings

Kevin Engel, Executive Vice President and director at Amkor Technology, Inc. (AMKR), reported transactions tied to the vesting of restricted stock units. On 09/30/2025 a grant-related event recorded 8,692 RSUs vested and withheld to satisfy tax obligations, and 3,725 shares were disposed at a price of $28.40 each. After these transactions the filing shows beneficial ownership related totals of 26,076 shares of common stock (derivative-related) and direct holdings reported as 15,046 and 11,321 on separate lines in Table I.

The filing explains the RSUs were originally granted on 02/20/2025 for 43,459 RSUs vesting in five equal quarterly installments through 06/30/2026, and that withheld shares were used to satisfy tax withholding with the Issuer paying the taxes on behalf of the reporting person.

Susan Y. Kim, a director and reported 10% owner of Amkor Technology, Inc. (AMKR), filed a Form 4 disclosing a disposition of 4,456,494 shares on 09/23/2025. The filing details numerous indirect holdings through entities and trusts for which she serves as trustee, general partner or manager, including 19,484,809 shares held by Sujochil, LP, 16,710,668 shares held by an LLC treated as a corporation, 4,418,610 shares held by family trusts (excluding GRATs), 3,800,000 shares held by GRATs, 3,483,000 shares held by GRATs of which she was settlor, and 3,789,479 shares indirectly owned via Sujoda Investments, LP. The filer disclaims beneficial ownership except for her pecuniary interest. The filing also reports dividend equivalent units accrued on 09/23/2025 related to time-vested RSUs granted 05/15/2025.

Douglas A. Alexander, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that increased his restricted stock unit holdings. The Form 4 reports three accruals of dividend equivalent units (DEUs) on 09/23/2025 tied to time‑vested restricted stock units granted on 05/17/2022, 05/16/2023 and 05/15/2025. Each DEU converts into an additional RSU subject to the same vesting and terms as the underlying award. The reported incremental amounts were 24.3374, 23.7001 and 27.3648 RSUs, bringing the post‑accrual beneficial ownership counts for those grants to 9,204.4883, 8,862.7341 and 9,854.8917 shares of common stock, respectively. These were recorded as acquisitions at $0 price per share because they represent dividend equivalents rather than purchases.

Roger A. Carolin, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that increased his restricted stock unit holdings. On 09/23/2025 DEUs were accrued in connection with dividends paid on time-vested RSUs granted on 05/16/2023 and 05/15/2025. The filing reports the accruals as acquisitions of 23.7001 RSUs (related to the 2023 grant) and 27.3648 RSUs (related to the 2025 grant), both with $0 price. After these accruals, the amounts shown as beneficially owned following the transactions are 8,862.7341 and 9,854.8917 shares, respectively. The Form 4 is signed by an attorney-in-fact on behalf of the reporting person and reflects routine equity accruals tied to dividend payments.

Winston J. Churchill, a director of Amkor Technology, Inc. (AMKR), reported on Form 4 that on 09/23/2025 he received 27.3648 restricted stock units as dividend equivalent units related to time‑vested RSUs granted May 15, 2025.

The DEUs were recorded at a price of $0, and following this accrual the reporting person beneficially owns 9,854.8917 shares of common stock on a direct basis. The Form 4 was signed by Mark N. Rogers, attorney‑in‑fact, on 09/25/2025. The filing shows Churchill’s reporting address in Boca Raton, FL, and lists his relationship to the issuer as a director.

AMKOR TECHNOLOGY, INC. (AMKR) reporting person Gil C. Tily, identified as a director, received 27.3648 dividend-equivalent units (DEUs) credited on 09/23/2025 in respect of time-vested restricted stock units (RSUs) originally granted on May 15, 2025. Each DEU represents an additional RSU subject to the same terms as the underlying RSU.

The DEUs were issued with a reported price of $0 and, following the transaction, the reporting person beneficially owns 9,854.8917 shares of common stock in a direct ownership form. The Form 4 was signed via attorney-in-fact on 09/25/2025.

AMKOR TECHNOLOGY, INC. (AMKR) director David N. Watson received 27.3648 restricted stock units (RSUs) credited as dividend equivalent units (DEUs) tied to time‑vested RSUs, recorded as acquired on 09/23/2025 at a $0 price. The DEUs mirror the original RSU grant terms and increased Mr. Watson's direct beneficial ownership to 9,854.8917 shares. The transaction was reported by an attorney‑in‑fact on behalf of the reporting person. This filing documents a routine equity accrual tied to a dividend on the company's RSUs rather than an open‑market purchase or sale.

Robert R. Morse, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that converted into additional restricted stock units on 09/23/2025. The filing reports two separate DEU accruals tied to previously granted time‑vested RSUs, resulting in acquisitions of 23.7001 and 27.3648 underlying shares respectively at a reported price of $0 per share. After these accruals, the reporting person beneficially owned 8,862.7341 and 9,854.8917 shares associated with those grants. The DEUs follow the same vesting provisions as the original RSU awards.

MaryFrances McCourt, a director of Amkor Technology, Inc. (AMKR), reported accruals of dividend equivalent units that converted into additional restricted stock units on 09/23/2025. Two separate DEU accruals were recorded: 23.7001 RSUs related to a grant originally dated 05/16/2023, and 27.3648 RSUs related to a grant originally dated 05/15/2025. Each accrued unit represents an additional RSU subject to the same terms as its underlying award. Both acquisitions were recorded at a $0 price and increased the reporting person’s beneficial holdings to 8,862.7341 and 9,854.8917 shares respectively. The Form 4 was signed by an attorney-in-fact, Mark N. Rogers, on 09/25/2025.