KIM AGNES C 4

What Happened

• Agnes C. Kim, reported as a 10% owner of Amkor Technology, disclosed that her spouse exercised stock options on July 20, 2026, resulting in the acquisition of 450,000 shares of Amkor common stock. The exercises were: 200,000 shares at $9.86 ($1,972,000) and 250,000 shares at $9.48 ($2,370,000), for a combined value of approximately $4.34 million.
• These were option exercises (transaction code M), meaning new shares were acquired upon conversion of previously granted options rather than shares bought on the open market. There is no sale reported in this filing.

Key Details

• Transaction dates/prices: July 20, 2026 — 200,000 shares @ $9.86; 250,000 shares @ $9.48.
• Total shares acquired: 450,000; total value ≈ $4,342,000.
• Option grant dates (per footnotes): the 200,000-share option was granted Feb 27, 2017; the 250,000-share option was granted Feb 15, 2019.
• Beneficial ownership: The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest (footnote/remark).
• Filing timeliness: Report filed July 22, 2026 for transactions on July 20, 2026 — appears to be filed within the normal two-business-day Section 16 window.

Context

• These transactions are exercises of previously granted options (code M). The filing does not indicate a cashless exercise or any immediate sale of the acquired shares — the reporting shows acquisition only.
• Because the exercises were done by the reporting person’s spouse and the filing includes a disclaimer of beneficial ownership (common in spousal transactions), this report primarily documents the technical acquisition rather than a direct signal of the reported 10% owner’s trading intent.