Amkor Technology director acquires 12.9709 stock units

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

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. reports director MaryFrances McCourt acquired 12.9709 dividend equivalent units tied to restricted stock units granted May 16, 2023, and 3.9978 units tied to restricted stock units granted May 13, 2026. Both amounts accrued upon payment of a dividend on September 22, 2026; each dividend equivalent unit represents an additional restricted stock unit subject to the same provisions as its related unit.

Insider Trade Summary

Grant/Award: 16.9687 shares

Grant/Award 2 txns

Insider McCourt MaryFrances

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	3.9978	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 11,536.4385 contracts (Direct)

Footnotes (2)

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 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: 12.9709 units Dividend equivalent units: 3.9978 units Underlying RSU grant date: May 16, 2023 +1 more

4 metrics

Dividend equivalent units 12.9709 units Tied to restricted stock units granted May 16, 2023; accrued September 22, 2026.

Dividend equivalent units 3.9978 units Tied to restricted stock units granted May 13, 2026; accrued September 22, 2026.

Underlying RSU grant date May 16, 2023 Grant date for restricted stock units related to 12.9709 dividend equivalent units.

Underlying RSU grant date May 13, 2026 Grant date for restricted stock units related to 3.9978 dividend equivalent units.

Key Terms

dividend equivalent units (DEUs), restricted stock units (RSUs), time-vested restricted stock units

3 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 type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

time-vested restricted stock units financial

"with respect to time-vested restricted stock units"

FAQ

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

How many dividend equivalent units did AMKR director MaryFrances McCourt acquire?

MaryFrances McCourt acquired 12.9709 dividend equivalent units tied to restricted stock units granted May 16, 2023, and 3.9978 units tied to restricted stock units granted May 13, 2026; both accrued upon dividend payment on September 22, 2026.

Were AMKR director MaryFrances McCourt's transactions made under a Rule 10b5-1 plan?

No Rule 10b5-1 plan is reported for these transactions.

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 - 04:40 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^*

McCourt MaryFrances

(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		3.9978		(2)	(2)	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 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 MaryFrances McCourt	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)