Engel Kevin K. 4

What Happened
Kevin K. Engel, President, CEO and a director of Amkor Technology, Inc. (AMKR), had 8,692 restricted stock units (RSUs) convert to common shares on June 30, 2026. Of those, 3,725 shares were withheld to satisfy tax withholding obligations (valued at $86.23 per share, total $321,207), leaving a net issuance of 4,967 shares to Mr. Engel. The RSU conversion is reported as an exercise/conversion of a derivative (code M) and the withholding is reported under code F.

Key Details

• Transaction date: 2026-06-30 (reported on Form 4 filed 2026-07-02).
• Conversions/vests: 8,692 shares acquired via conversion/settlement of RSUs at $0.00 (code M).
• Tax withholding: 3,725 shares withheld/disposed at $86.23 per share for $321,207 (code F).
• Net shares issued to insider: 4,967 (8,692 converted − 3,725 withheld).
• Footnote: These shares relate to RSUs granted Feb 20, 2025; the filing notes the issuer withheld shares to cover taxes and that the issuer will pay these taxes on behalf of the reporting person.
• Shares owned after transaction: Not disclosed in the filing.
• Filing timeliness: Report filed 2026-07-02 covering the 2026-06-30 vesting event.

Context
This was a routine RSU vesting and tax-withholding transaction (commonly seen when equity awards vest). The conversion involved no cash exercise price; withholding shares were used to satisfy tax obligations (a cashless withholding). Such withholding transactions are administrative and do not, by themselves, signal a change in the insider’s market view.