Amkor Technology director acquires dividend stock units

Each dividend equivalent unit is an additional restricted stock unit subject to the same provisions as the related award.

Rhea-AI Filing Summary

Amkor Technology, Inc. (AMKR) director Robert Randolph Morse acquired 12.9709, 14.9767, and 3.9978 dividend equivalent units on September 22, 2026. They accrued upon dividend payments on restricted stock units granted on May 16, 2023, May 15, 2025, and May 13, 2026, respectively. Each dividend equivalent unit represents an additional restricted stock unit subject to the same provisions as the related unit.

Insider Trade Summary

Grant/Award: 31.9454 shares

Grant/Award 3 txns

Insider Morse Robert Randolph

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1	12.9709	$0.00	$0.00
Grant/Award	Restricted Stock Units F2	14.9767	$0.00	$0.00
Grant/Award	Restricted Stock Units F3	3.9978	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 21,453.9003 contracts (Direct)

Footnotes (3)

1. F1. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 22 2026 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. F2. Represents DEUs accrued upon the payment of a dividend on September 22, 2026 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.
3. F3. Represents DEUs accrued upon the payment of a dividend on September 22, 2026 with respect to RSUs of the Issuer granted to the Reporting Person on May 13, 2026. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.

Key Figures

Dividend equivalent units on May 16, 2023 RSU award: 12.9709 units Dividend equivalent units on May 15, 2025 RSU award: 14.9767 units Dividend equivalent units on May 13, 2026 RSU award: 3.9978 units

3 metrics

Dividend equivalent units on May 16, 2023 RSU award 12.9709 units Accrued September 22, 2026, on time-vested restricted stock units.

Dividend equivalent units on May 15, 2025 RSU award 14.9767 units Accrued September 22, 2026, on restricted stock units.

Dividend equivalent units on May 13, 2026 RSU award 3.9978 units Accrued September 22, 2026, on restricted stock units.

Key Terms

dividend equivalent units ("DEUs"), restricted stock units ("RSUs")

2 terms

dividend equivalent units ("DEUs") financial

"Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend"

restricted stock units ("RSUs") financial

"with respect to time-vested restricted stock units ("RSUs")"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many AMKR restricted stock units did director Robert Randolph Morse acquire?

Director Robert Randolph Morse acquired 12.9709, 14.9767, and 3.9978 dividend equivalent units on September 22, 2026. They accrued on restricted stock units granted May 16, 2023, May 15, 2025, and May 13, 2026, respectively; each represents an additional restricted stock unit subject to the same provisions as the related RSU.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/24/2026 - 04:41 PM Accepted by SEC EDGAR 09/24/2026 - 04:41 PM Learn about SEC filing dates

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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Morse Robert Randolph

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE ARIZONA 85284

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)	09/22/2026		A		12.9709		(1)	(1)	Common Stock	12.9709	$0	8,916.9241	D
Restricted Stock Units	(2)	09/22/2026		A		14.9767		(2)	(2)	Common Stock	14.9767	$0	9,917.4618	D
Restricted Stock Units	(3)	09/22/2026		A		3.9978		(3)	(3)	Common Stock	3.9978	$0	2,619.5144	D

Explanation of Responses:

1. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 22 2026 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 22, 2026 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.

3. Represents DEUs accrued upon the payment of a dividend on September 22, 2026 with respect to RSUs of the Issuer granted to the Reporting Person on May 13, 2026. 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	09/24/2026
	** 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.
* Form 4: SEC 1474 (03-26)