KIM SUSAN Y 4

What Happened
Susan Y. Kim, a reported 10% owner of Amkor Technology, Inc. (AMKR), received 9,893 shares of AMKR common stock as the result of vested restricted stock units (RSUs) and dividend equivalent units (DEUs) converting to shares. The Form 4 reports the acquisition at $0.00 because these shares resulted from prior equity awards vesting and converting rather than an open‑market purchase.

Key Details

• Transaction date: June 12, 2026 (conversion of vested RSUs/DEUs into common stock). Transaction code: A (award/grant/acquisition).
• Shares acquired: 9,893 shares (9,789 RSUs originally granted on May 15, 2025 plus 104 DEUs). Price reported: $0.00.
• Reported beneficial/pecuniary interest: the filing treats Ms. Kim as having a pecuniary interest in 36,024,492 shares via trusts, GRATs, partnerships and related entities (see footnotes).
• Filing timeliness: Reported on June 12, 2026 (period of report same date) — appears timely.
• Notable footnotes: RSUs granted May 15, 2025 vested May 13, 2026 (plus 104 DEUs) and converted one‑for‑one to common stock on June 12, 2026. The reporting person disclaims beneficial ownership except to the extent of her pecuniary interest and is a trustee/partner/member of entities with large holdings (see F2–F4). Remark clarifies the filing is not an admission of ownership of other group members' shares.

Context
This was a vesting/conversion of equity awards, not an open‑market purchase or sale. Such award‑based acquisitions reflect compensation or dividend equivalents becoming shares; they do not necessarily signal direct buying or selling intent. As a 10% owner with holdings routed through trusts and partnerships, the report focuses on pecuniary interest and estate/ownership structures rather than standard executive trading.