ALEXANDER DOUGLAS A 4

What Happened
Douglas A. Alexander, a director of Amkor Technology, Inc. (AMKR), was credited with four dividend-equivalent unit (DEU) awards on June 23, 2026, totaling 28.495 RSU-equivalent shares (8.385 + 8.165 + 9.428 + 2.517). Each unit was recorded at $0.00 (no cash purchase or sale); these DEUs represent additional restricted stock units subject to the same terms and vesting as the underlying RSUs.

Key Details

• Transaction date: June 23, 2026; Form 4 filed June 25, 2026 (appears timely).
• Transaction code: A = Award/Grant (derivative units credited). Price: $0.00 per unit; total recorded value $0.
• Total DEUs credited: 28.495 RSU-equivalent units (sum of four entries).
• Shares owned after transaction: not disclosed in the provided excerpt of the filing.
• Footnotes: F1–F4 indicate DEUs were accrued on the June 23, 2026 dividend with respect to RSUs originally granted on May 17, 2022 (F1), May 16, 2023 (F2), May 15, 2025 (F3), and May 13, 2026 (F4). Each DEU converts to an additional RSU subject to the same provisions as the original RSU.

Context
DEUs are an administrative credit that increases the number of RSUs tied to an insider’s existing grants when a dividend is paid; they are not open-market purchases or sales and do not necessarily indicate a change in the insider’s market view. The economic impact (and any tax consequences) typically occurs when the underlying RSUs vest and convert to shares.