ALEXANDER DOUGLAS A 4

What Happened Alexander A. Douglas, a director of Amkor Technology, received three grants of dividend-equivalent units (DEUs) on March 31, 2026 totaling 50.029 additional restricted stock units (16.148 + 15.725 + 18.156). Each unit was issued at $0.00 (derivative award), meaning no cash was paid—these DEUs simply increase his RSU balance and are subject to the same terms as the original RSUs. This is an award/compensatory event rather than an open-market purchase or sale.

Key Details

• Transaction date and type: March 31, 2026 — Code A (award/other acquisition); reported on Form 4 filed April 2, 2026.
• Price/consideration: $0.00 per DEU; total cash value reported = $0 (derivative RSUs).
• Amounts: 16.148 DEUs (related to RSUs granted May 17, 2022), 15.725 DEUs (RSUs granted May 16, 2023), and 18.156 DEUs (RSUs granted May 15, 2025) — total 50.029 DEUs.
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Footnotes: F1–F3 confirm each DEU was accrued upon the March 31, 2026 dividend and each DEU converts into an additional RSU subject to the same provisions as the underlying RSU.
• Timeliness: Form 4 was filed April 2, 2026 for the March 31 transaction; no late-filing flag is indicated in the provided data.

Context DEUs are dividend equivalents credited on existing time-vested RSUs and typically do not signal a change in insider sentiment like open-market buys or sells. These are compensatory/administrative additions to Douglas’s deferred equity and will follow the vesting and transfer restrictions of the original RSU grants.