WATSON DAVID N 4

4 · AMKOR TECHNOLOGY, INC. · Filed May 15, 2026

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Updated May 16, 2026

AMKR Director David Watson Receives RSU Award, Converts RSUs

What Happened

David N. Watson, a director of Amkor Technology, had previously granted RSUs vest on May 13, 2026. On that date he converted 9,893 vested RSUs into common stock (non‑cash conversion at $0.00 per share) and a fractional 0.0573 RSU was settled in cash. On the same date he received a new grant of 2,613 RSUs (awarded for service) that vest per the award terms.
No cash purchase price was paid for the converted shares or the new RSU grant; the Form 4 shows $0.00 per share for these transactions.

Key Details

Transaction date: May 13, 2026; Form 4 filed May 15, 2026 (timely filing).
Conversions: 9,893 RSUs converted into common stock (resulting from a May 15, 2025 grant that vested); 0.0573 RSU cashed out as a dividend equivalent.
New grant: 2,613 RSUs awarded on May 13, 2026; vest in full on earlier of one-year anniversary or the issuer's next annual meeting.
Price: $0.00 per share shown (RSU vesting/conversion and award are non‑cash).
Shares owned after the transaction: not specified in the provided filing excerpt.
Footnotes: F1 explains the 2025 RSU grant, DEU treatment, and cash settlement of the fractional unit; F2 describes terms and vesting schedule of the 2026 RSU grant.

Context

These transactions reflect RSU vesting/conversion and a new director RSU grant, not open‑market buying or selling. Conversions of RSUs into shares are common compensation events and do not necessarily indicate the insider’s view of the stock.

Form 4

Period: 2026-05-13

Director

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-05-13+9,893→ 130,650 total
Exercise/Conversion
Restricted Stock Units
[F1]
2026-05-13−9,893.057→ 0 total
→ Common Stock (9,893.057 underlying)
Award
Restricted Stock Units
[F2]
2026-05-13+2,613→ 2,613 total
→ Common Stock (2,613 underlying)

Footnotes (2)

[F1]On May 15, 2025, the Reporting Person was granted 9,789 time-vested restricted stock units ("RSUs") pursuant to the Amkor Technology, Inc. (the "Issuer") 2021 Equity Incentive Plan, as amended (the "Plan"), and the applicable award agreement (the "2025 RSUs"). In connection with the vesting of the 2025 RSUs on May 13, 2026: (i) 0.0573 of the 2025 RSUs, which had accrued as dividend equivalent units ("DEUs") with each DEU representing an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued, were settled in cash; and (ii) the remainder of the 2025 RSUs, including 104 DEUs, converted into common stock of the Issuer on a one-for-one basis.
[F2]Represents shares of common stock underlying RSUs granted on May 13, 2026 (the "Grant Date") pursuant to the Plan (the "2026 RSUs"). Subject to the terms and conditions of the applicable award agreement, the 2026 RSUs may be converted into common stock of the Issuer on a one-for-one basis and will vest in full on the earlier of the first anniversary of the Grant Date or the date of the Issuer's first annual meeting of stockholders immediately following the Grant Date. The 2026 RSUs were awarded for no consideration other than the Reporting Person's service as a director of the Issuer.

Signature

/s/ Mark N. Rogers, Attorney-in-Fact for David N. Watson|2026-05-15

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