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

Rhea-AI Filing Summary

Douglas A. Alexander, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that increased his restricted stock unit holdings. The Form 4 reports three accruals of dividend equivalent units (DEUs) on 09/23/2025 tied to time‑vested restricted stock units granted on 05/17/2022, 05/16/2023 and 05/15/2025. Each DEU converts into an additional RSU subject to the same vesting and terms as the underlying award. The reported incremental amounts were 24.3374, 23.7001 and 27.3648 RSUs, bringing the post‑accrual beneficial ownership counts for those grants to 9,204.4883, 8,862.7341 and 9,854.8917 shares of common stock, respectively. These were recorded as acquisitions at $0 price per share because they represent dividend equivalents rather than purchases.

Insights

Financial Analyst

TL;DR: Routine accrual of dividend equivalent units modestly increases an insider's RSU holdings; no cash transaction or exercise required.

The Form 4 documents non‑cash increases in restricted stock units for a company director via dividend equivalent units (DEUs). Because these are accrued DEUs tied to prior RSU grants, they are accounted as additional RSUs with a $0 acquisition price and retain the original grant's vesting/terms. The sizes of the accruals (roughly 24.3, 23.7 and 27.4 RSUs) are small relative to the total reported holdings for those grants (8,862–9,855 shares), so the change is immaterial to overall ownership concentration. Impact to dilution or outstanding share count is negligible in the short term.

Corporate Governance Expert

TL;DR: Disclosure aligns with Section 16 reporting; transaction is routine and reflects standard equity compensation mechanics.

The filing clearly explains that DEUs were credited upon a dividend payment and that each DEU corresponds to an additional RSU subject to existing vesting provisions of the May 2022, May 2023 and May 2025 grants. This is a standard outcome under equity plans that provide dividend equivalents. The Form 4 gives required transparency about insider holdings and does not indicate any change in control, new grants, exercises, or sales. From a governance perspective, the disclosure is complete and routine.

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

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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^*

ALEXANDER DOUGLAS A

(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		24.3374		(1)	(1)	Common Stock	24.3374	$0	9,204.4883	D
Restricted Stock Units	(2)	09/23/2025		A		23.7001		(2)	(2)	Common Stock	23.7001	$0	8,862.7341	D
Restricted Stock Units	(3)	09/23/2025		A		27.3648		(3)	(3)	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 17, 2022. 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 16, 2023. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.

3. 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 Douglas A. Alexander	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).
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