Engel Kevin K. 4

4 · AMKOR TECHNOLOGY, INC. · Filed Feb 26, 2026

AI-generated summary of this filing

Updated Feb 27, 2026

Amkor (AMKR) CEO Kevin Engel Sells 12,500 Shares

What Happened

Kevin K. Engel, President & CEO and Director of Amkor Technology (AMKR), reported several equity transactions on Feb 24, 2026. He had 910 shares issued on vesting of time‑vested RSUs (reported at $0 as they were awards). Of the transactions reported, he sold 12,500 shares in the open market at a weighted average price of $48.75, generating proceeds of about $609,375. Separately, 372 shares were withheld to satisfy tax withholding obligations at an average price of $48.53 (tax value ≈ $18,053).

Key Details

Transaction date: February 24, 2026; Form 4 filed Feb 26, 2026 (appears filed within the normal 2‑business‑day window).
Open‑market sale: 12,500 shares at a weighted average price $48.75 (range $48.73–$48.81) — proceeds ≈ $609,375. (Footnote F2 provides the price range and offer to disclose per‑price counts if requested.)
RSU vesting: 910 shares reported as acquired upon conversion of time‑vested RSUs (awarded under the 2021 Equity Incentive Plan; see F3). 372 of the shares were withheld to cover tax withholding (F1); the issuer will pay the taxes on his behalf.
Shares owned after the transactions: not specified in the provided excerpt — see the full Form 4 for total post‑transaction holdings.
Filing footnotes: F1–F3 explain tax withholding, the weighted average sale price range, and that the shares stem from RSUs granted Feb 24, 2022 and vesting over four years.

Context

This filing reflects routine RSU vesting and an open‑market sale. The RSU entries are not purchases — they document issuance on vesting (no out‑of‑pocket exercise cost). The withholding of shares to cover taxes is a common administrative step and does not itself indicate a buy/sell decision. The notable item for investors is the sizeable open‑market sale (12,500 shares ≈ $609k).

Form 4

Period: 2026-02-24

DirectorPresident and CEO

Transactions

Exercise/Conversion
Common Stock
2026-02-24+910→ 15,825 total
Tax Payment
Common Stock
[F1]
2026-02-24$48.53/sh−372$18,053→ 15,453 total
Sale
Common Stock
[F2]
2026-02-24$48.75/sh−12,500$609,375→ 2,953 total
Exercise/Conversion
Restricted Stock Units
[F3]
2026-02-24−910→ 0 total
Exercise: $0.00→ Common Stock (910 underlying)

Footnotes (3)

[F1]The transaction represents shares withheld by Amkor Technology, Inc. (the "Issuer") in connection with the vesting of certain restricted stock units ("RSUs") granted to the Reporting Person on February 24, 2022 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.
[F2]The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.73 to $48.81. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.
[F3]Represents shares of the Issuer's common stock underlying time-vested RSUs on the Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as a service provider of the Issuer and vested in four equal annual installments beginning on the first anniversary of the Grant Date.

Signature

/s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel|2026-02-26

1 file