AMKR Insider Filing: Carolin Credited Additional RSUs on 09/23/2025

Rhea-AI Filing Summary

Roger A. Carolin, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that increased his restricted stock unit holdings. On 09/23/2025 DEUs were accrued in connection with dividends paid on time-vested RSUs granted on 05/16/2023 and 05/15/2025. The filing reports the accruals as acquisitions of 23.7001 RSUs (related to the 2023 grant) and 27.3648 RSUs (related to the 2025 grant), both with $0 price. After these accruals, the amounts shown as beneficially owned following the transactions are 8,862.7341 and 9,854.8917 shares, respectively. The Form 4 is signed by an attorney-in-fact on behalf of the reporting person and reflects routine equity accruals tied to dividend payments.

Positive

• Director equity increased through dividend equivalent units, aligning management and shareholder interests
• Transactions are non-cash ($0 price), indicating compensation-related accruals rather than opportunistic trading

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Director received dividend-equivalent RSUs, modestly increasing his equity stake; routine, non-cash compensation event.

The filing documents the accrual of dividend equivalent units (DEUs) for time-vested restricted stock units previously granted to a director. These DEUs convert to additional RSUs subject to the same vesting provisions as the underlying awards. The reported acquisitions are non-cash ($0 price) and reflect compensation mechanics rather than open-market purchases or sales. For governance review, this is a customary occurrence and does not indicate change in control, related-party transactions beyond standard director compensation, or immediate dilution beyond the already-granted equity plan.

Compensation/Equity Plan Analyst

TL;DR: Dividend equivalents increased restricted share counts by precise small amounts; materiality to shareholders is minimal.

The detail shows DEUs credited on 09/23/2025 tied to two prior RSU grants (05/16/2023 and 05/15/2025). Quantities credited are 23.7001 and 27.3648 RSUs, reported as acquired at $0, with post-accrual beneficial ownership figures of 8,862.7341 and 9,854.8917 shares. This reflects plan-specified dividend treatment and does not constitute exercised options or market transactions. From an equity-compensation perspective, these are routine accruals that slightly increase future potential dilution when RSUs vest and are settled.

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^*

Carolin Roger Anthony

(Last) (First) (Middle)

7 GREAT VALLEY PARKWAY,

SUITE 190

(Street)

MALVERN PA 19355

(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 Amkor Technology, Inc. (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 Roger A. Carolin	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 AMKR director Roger A. Carolin report on Form 4?

The Form 4 reports accruals of dividend equivalent units (DEUs) that were converted into additional restricted stock units on 09/23/2025.

How many RSUs were credited to Roger A. Carolin on 09/23/2025?

The filing shows accruals of 23.7001 RSUs (from the 05/16/2023 grant) and 27.3648 RSUs (from the 05/15/2025 grant).

What are the reported beneficial ownership amounts after the accruals?

The amounts reported as beneficially owned following the transactions are 8,862.7341 and 9,854.8917 shares, respectively.

Did the Form 4 report purchases or sales on the open market?

No; the filing reports accruals of DEUs at $0, representing additional RSUs, not market purchases or dispositions.

Who signed the Form 4 for the reporting person?

The form was signed by Mark N. Rogers, Attorney-in-Fact for Roger A. Carolin on 09/25/2025.