KIM SUSAN Y 4

What Happened
Susan Y. Kim, a reported 10% owner of Amkor Technology, was credited 18.156 dividend-equivalent units (DEUs) on March 31, 2026. These DEUs were recorded as the acquisition of derivative securities (award/grant) at $0.00, so no cash changed hands and the reported transaction value is $0. Each DEU represents an additional restricted stock unit (RSU) tied to the original time-vested RSUs granted May 15, 2025.

Key Details

• Transaction date: 2026-03-31; Form 4 filed 2026-04-02 (timely filing).
• Transaction type/code: Award/Grant of derivative securities (A); DEUs added to existing RSUs.
• Amount: 18.156 DEUs / additional RSUs; reported price $0.00 (no proceeds).
• Reported beneficial interest: per footnotes the Reporting Person is treated as having a pecuniary interest in approximately 36,024,492 shares held across trusts and entities (see footnotes for breakdown).
• Notable footnotes: F5 explains DEUs were accrued upon the March 31 dividend and each DEU equals an additional RSU subject to the same terms; F1–F4 and F3/F4 clarify trust/partnership holdings, disclaimers, and that the filer resigned as manager of KCP, LLC on April 1, 2026.
• No sale or open-market purchase occurred; this was an award/adjustment of equity units.

Context
DEUs are dividend equivalents that convert into additional RSUs and are typically a mechanical accrual tied to dividend payments on held RSUs—not an independent market buy or sell. As a 10% owner with large indirect holdings through trusts and partnerships, this transaction reflects an administrative equity accrual rather than a discretionary purchase or sale by an executive; it should be interpreted as a non-cash award, not a direct market signal.