Douglas A. Alexander - 07 Aug 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Reporting relationship: Director
Issuer ticker: AMKR
Reported as of: 07 Aug 2026
Net transaction value: -$279,050
SEC form: 4
Accepted by SEC: 11 Aug 2026, 16:36:10 UTC
Prior SEC filing: 25 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark N. Rogers, Attorney-in-Fact for Douglas A. Alexander

Key filing fact

Douglas A. Alexander filed Form 4 for AMKOR TECHNOLOGY, INC. (AMKR) on 11 Aug 2026.

Key facts

This page summarizes Douglas A. Alexander's Form 4 filing for AMKOR TECHNOLOGY, INC. (AMKR).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 11 Aug 2026, 16:36.

Change

Previous filing in this sequence was filed on 25 Jun 2026.
Current net transaction value: -$279,050.

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 0001195858 Primary reporting owner

ALEXANDER DOUGLAS A

Relationship: Director
Address: 2045 EAST INNOVATION CIRCLE, TEMPE
Signature: /s/ Mark N. Rogers, Attorney-in-Fact for Douglas A. Alexander
Signature date: 11 Aug 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: +5,000
Change %: +17%
Price: $8.51^*
Shares after: 34,109
Date: 07 Aug 2026
Ownership: Direct

AMKR transaction

Common Stock

Sale

Transaction value: $279,050
Shares: -5,000
Change %: -15%
Price: $55.81
Shares after: 29,109
Date: 07 Aug 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

AMKR transaction Derivative

Director Stock Option (Right-to-Buy)

Options Exercise

Transaction value
Shares: -5,000
Change %: -25%
Price: $0.000000^*
Shares after: 14,657
Date: 07 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,000
Exercise price: $8.51
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote F1

The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026.

Footnote F2

This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 1, 2018, vested in full on May 1, 2019.