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

Rhea-AI Filing Summary

MaryFrances McCourt, a director of Amkor Technology, Inc. (AMKR), reported accruals of dividend equivalent units that converted into additional restricted stock units on 09/23/2025. Two separate DEU accruals were recorded: 23.7001 RSUs related to a grant originally dated 05/16/2023, and 27.3648 RSUs related to a grant originally dated 05/15/2025. Each accrued unit represents an additional RSU subject to the same terms as its underlying award. Both acquisitions were recorded at a $0 price and increased the reporting person’s beneficial holdings to 8,862.7341 and 9,854.8917 shares respectively. The Form 4 was signed by an attorney-in-fact, Mark N. Rogers, on 09/25/2025.

Positive

• Director's equity alignment increased via accrual of 23.7001 and 27.3648 RSUs, reinforcing long-term alignment with shareholders
• No cash outlay required for the additional RSUs (recorded at $0), indicating the change arose from dividend equivalents rather than purchases

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine dividend-equivalent accruals increased a director’s RSU holdings; no cash purchase or change in vesting terms disclosed.

The Form 4 documents standard dividend equivalent units credited to previously granted restricted stock units, increasing the director’s recorded beneficial ownership without any cash outlay. The accruals mirror ordinary compensation mechanics and do not indicate a new grant, sale, or other liquidity event. For governance oversight, this is a routine update confirming the director continues to receive equity-settled dividend equivalents consistent with existing awards.

Executive Compensation Analyst

TL;DR: DEUs converted to RSUs in modest amounts, increasing share-based compensation holdings; no exercise or cash transaction occurred.

The reported additions of 23.7001 and 27.3648 RSUs are attributable to dividend equivalents credited on 09/23/2025 and recorded at $0 price, consistent with standard equity compensation practices. These amounts are immaterial relative to typical executive equity grants but are relevant to total outstanding equity for the director. The filing does not disclose vesting schedule changes or accelerated vesting.

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^*

McCourt MaryFrances

(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		23.7001		(1)	(1)	Common Stock	23.7001	$0	8,862.7341	D
Restricted Stock Units	(2)	09/23/2025		A		27.3648		(2)	(2)	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 16, 2023. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.

2. Represents DEUs accrued upon the payment of a dividend on September 23, 2025 with respect to 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 MaryFrances McCourt	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.
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FAQ

What did MaryFrances McCourt report on the AMKR Form 4?

The filing reports accruals of dividend equivalent units that converted into 23.7001 and 27.3648 restricted stock units on 09/23/2025.

Were any shares purchased for cash in this transaction for AMKR director McCourt?

No. Both accruals were recorded at a $0 price, representing dividend equivalents credited to existing RSUs.

How many shares did McCourt beneficially own after the reported transactions?

The Form 4 shows beneficial ownership totals of 8,862.7341 and 9,854.8917 shares following the respective transactions.

Who signed the Form 4 for MaryFrances McCourt and when?

The Form 4 was signed by attorney-in-fact Mark N. Rogers on 09/25/2025.

Do the filings indicate any change to vesting or grant terms for these RSUs?

No. The filing states each DEU represents an additional RSU subject to the same provisions as the underlying RSU; no vesting changes are disclosed.