[Form 4] AMKOR TECHNOLOGY, INC. Insider Trading Activity

Rhea-AI Filing Summary

Daniel J.L. Liao, a director of Amkor Technology (AMKR), recorded a Form 4 disclosing dividend equivalent units credited on time-vested restricted stock units. The filing shows that on 09/23/2025 the reporting person received 27.3648 restricted stock units (RSUs) as dividend equivalent units (DEUs) related to RSUs granted on 05/15/2025. The DEUs carry the same terms as the underlying RSUs and were entered at a price of $0. After the accrual the reporting person beneficially owned 9,854.8917 shares directly. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Liao on 09/25/2025.

Positive

• Reporting person received 27.3648 RSUs as dividend equivalents, increasing direct beneficial ownership to 9,854.8917 shares
• Disclosure appears complete and timely with attorney-in-fact signature filed on 09/25/2025

Negative

• None.

Insights

Financial Analyst

TL;DR: Minor insider equity accrual; no material change to share count or control.

The Form 4 reports a small accrual of 27.3648 RSUs as dividend equivalents on time-vested RSUs originally granted 05/15/2025, increasing direct beneficial ownership to 9,854.8917 shares. This is an administrative equity adjustment tied to dividend treatment on RSUs rather than a purchase or sale of stock, so it does not change outstanding shares materially or indicate a change in insider confidence. For valuation or dilution analysis, the amount is immaterial relative to a typical public company float.

Corporate Governance Expert

TL;DR: Routine disclosure reflecting compensation mechanics; governance impact is negligible.

The filing documents receipt of DEUs credited upon a dividend payment, which is a standard practice that mirrors dividend treatment on unvested equity awards. Documentation is complete: reporting person, relationship (Director), transaction date, description of DEUs, and beneficial ownership post-transaction are provided. The Form 4 was properly signed by an attorney-in-fact. There are no indications of atypical related-party transactions, accelerations, or amendments that would raise governance concerns.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Liao Daniel JL

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE AZ 85284

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AMKOR TECHNOLOGY, INC. [ AMKR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/23/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	09/23/2025		A		27.3648		(1)	(1)	Common Stock	27.3648	$0	9,854.8917	D

Explanation of Responses:

1. 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.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Daniel Liao	09/25/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did the AMKR Form 4 filed by Daniel Liao report?

It reported the accrual of 27.3648 restricted stock units (DEUs) on 09/23/2025 and a direct beneficial ownership of 9,854.8917 shares.

Why were the 27.3648 RSUs credited to the reporting person?

The DEUs were accrued upon payment of a dividend on time-vested RSUs granted on 05/15/2025; each DEU represents an additional RSU with the same terms.

Did the Form 4 show any stock purchases or sales by the reporting person (AMKR)?

No purchase or sale was reported; the entry reflects dividend equivalent units credited at a price of $0.

What is the reporting person’s relationship to AMKR?

Daniel JL Liao is reported as a Director of Amkor Technology, Inc.

When was the Form 4 signed and by whom?

The Form 4 was signed by Mark N. Rogers as Attorney-in-Fact for Daniel Liao on 09/25/2025.