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

Rhea-AI Filing Summary

Robert R. Morse, a director of Amkor Technology, Inc. (AMKR), received dividend equivalent units that converted into additional restricted stock units on 09/23/2025. The filing reports two separate DEU accruals tied to previously granted time‑vested RSUs, resulting in acquisitions of 23.7001 and 27.3648 underlying shares respectively at a reported price of $0 per share. After these accruals, the reporting person beneficially owned 8,862.7341 and 9,854.8917 shares associated with those grants. The DEUs follow the same vesting provisions as the original RSU awards.

Positive

• Insider alignment: DEUs converted to additional RSUs, increasing the director's equity stake under the same vesting terms
• No cash paid: Transactions were non‑cash dividend equivalent accruals, indicating routine compensation mechanics rather than opportunistic trading

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine dividend equivalent accruals converted to RSUs; small incremental insider holdings, no cash exchange.

The Form 4 discloses that the reporting director received dividend equivalent units that were credited as additional restricted stock units tied to prior RSU grants. Each DEU converts into an additional RSU subject to the same vesting terms, and the reported price was zero, indicating these were non‑cash accruals rather than open‑market purchases or exercised options. The incremental amounts (23.7001 and 27.3648 underlying shares) are modest relative to outstanding shares and reflect compensation mechanics rather than active trading or material insider accumulation.

Corporate Governance Expert

TL;DR: Disclosure is standard for equity compensation; reflects alignment with shareholder interests through RSU program.

The disclosure documents routine application of dividend equivalent units to time‑vested RSUs granted in prior award cycles. These DEUs accrue automatically when dividends are paid and mirror the original RSU terms, preserving the director's long‑term alignment with equity incentives. The filing provides clear mapping to the grant dates referenced and the post‑accrual beneficially owned amounts, satisfying Section 16 reporting obligations. There is no indication of unusual transactions or exemption usage.

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^*

Morse Robert Randolph

(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 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 Robert R. Morse	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 Robert R. Morse report on Form 4 for AMKR?

The Form 4 reports accruals of dividend equivalent units that converted into additional restricted stock units tied to prior RSU grants.

How many shares were acquired or credited in the AMKR Form 4?

The filing shows accruals representing 23.7001 and 27.3648 underlying shares credited as RSUs.

What was the price paid for the securities in the AMKR Form 4?

The reported price for the DEU conversions was $0, indicating these were non‑cash accruals.

What is Robert R. Morse's relationship to AMKR?

The filing identifies Robert R. Morse as a Director of Amkor Technology, Inc.

How many shares does the filing show beneficially owned after the transactions?

The filing reports post‑transaction beneficial ownership amounts of 8,862.7341 and 9,854.8917 shares associated with the respective RSU grants.