David N. Watson - 13 May 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Reporting relationship: Director
Issuer ticker: AMKR
Reported as of: 13 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 May 2026, 16:35:37 UTC
Prior SEC filing: 02 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark N. Rogers, Attorney-in-Fact for David N. Watson

Key filing fact

David N. Watson filed Form 4 for AMKOR TECHNOLOGY, INC. (AMKR) on 15 May 2026.

Key facts

This page summarizes David N. Watson's Form 4 filing for AMKOR TECHNOLOGY, INC. (AMKR).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 15 May 2026, 16:35.

Change

Previous filing in this sequence was filed on 02 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001276908 Primary reporting owner

WATSON DAVID N

Relationship: Director
Address: 2045 EAST INNOVATION CIRCLE, TEMPE
Signature: /s/ Mark N. Rogers, Attorney-in-Fact for David N. Watson
Signature date: 15 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMKR transaction

Common Stock

Options Exercise

Transaction value
Shares: +9,893
Change %: +8.2%
Price: $0.000000^*
Shares after: 130,650
Date: 13 May 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMKR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -9,893
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 13 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 9,893
Exercise price
Footnotes: F1

AMKR transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +2,613
Change %
Price: $0.000000^*
Shares after: 2,613
Date: 13 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,613
Exercise price
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote 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.

Footnote 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.