John D. Liu - Sep 23, 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role: Director
Signature: /s/ Mark N. Rogers, Attorney-in-Fact for John D. Liu
Stock symbol: AMKR
Transactions as of: Sep 23, 2025
Transactions value $: $0
Form type: 4
Date filed: 9/25/2025, 04:33 PM
Previous filing: Jun 27, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
LIU JOHN D	Director	2045 E INNOVATION CIRCLE, TEMPE	/s/ Mark N. Rogers, Attorney-in-Fact for John D. Liu	2025-09-25	0001288449

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AMKR	Restricted Stock Units	Award	$0	+27.4	+0.28%	$0.00	9.85K	Sep 23, 2025	Common Stock	27.4		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 23, 2025 with respect to time-vested restricted stock units ("RSUs") of the Issuer granted to the Reporting Person on May 15, 2025. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.