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

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. (AMKR) reporting person Gil C. Tily, identified as a director, received 27.3648 dividend-equivalent units (DEUs) credited on 09/23/2025 in respect of time-vested restricted stock units (RSUs) originally granted on May 15, 2025. Each DEU represents an additional RSU subject to the same terms as the underlying RSU.

The DEUs were issued with a reported price of $0 and, following the transaction, the reporting person beneficially owns 9,854.8917 shares of common stock in a direct ownership form. The Form 4 was signed via attorney-in-fact on 09/25/2025.

Positive

• Director's equity stake increased via 27.3648 dividend-equivalent units, raising direct beneficial ownership to 9,854.8917 shares
• Non-cash issuance (DEUs) preserves cash for the company while aligning director interests with shareholders through equity

Negative

• None.

Insights

Financial Analyst

TL;DR: Small, non-cash equity accrual increased a director's direct holdings modestly; no cash outlay or option exercise reported.

The reported transaction is a dividend-equivalent accrual on previously granted RSUs, adding 27.3648 RSUs at a $0 price, which increases the director's direct beneficial ownership to 9,854.8917 shares. This is administrative and non-cash in nature and does not reflect an open-market purchase or sale that would signal a change in trading conviction. The scale of the increment is immaterial relative to typical outstanding share counts for public issuers.

Corporate Governance Expert

TL;DR: Routine equity compensation mechanics; DEUs mirror dividend treatment on time-vested RSUs and carry the same vesting provisions.

The filing documents the standard practice of crediting dividend-equivalent units to time-vested RSUs granted earlier in the year. The DEUs carry the same conditions as the underlying RSUs, meaning they remain subject to the original vesting and forfeiture terms. The filing was executed by an attorney-in-fact, which is customary for administrative filings.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Tily Gil C.

(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 Gil C. Tily	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 transaction was reported on the AMKR Form 4 for Gil C. Tily?

The Form 4 reports the accrual of 27.3648 dividend-equivalent units (DEUs) on 09/23/2025 related to previously granted time-vested RSUs.

How many shares does Gil C. Tily beneficially own after the reported transaction (AMKR)?

The filing shows 9,854.8917 shares of common stock beneficially owned following the transaction, held in direct form.

Was there any cash paid for the DEUs in the AMKR Form 4 filing?

No cash consideration was reported; the DEUs were recorded with a price of $0.

What is the nature of the DEUs reported for AMKR?

The DEUs are dividend equivalents accrued on time-vested RSUs granted May 15, 2025, and each DEU represents an additional RSU subject to the same terms as the original RSU.

Who signed the Form 4 for Gil C. Tily (AMKR)?

The form was signed by Mark N. Rogers, Attorney-in-Fact for Gil C. Tily on 09/25/2025.