Amkor director gets 2.5166 dividend units

Rutten Guillaume Marie Jean reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 06/25/2026 - 04:46 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Rutten Guillaume Marie Jean reported acquisition or exercise transactions in this Form 4 filing.

AMKOR TECHNOLOGY, INC. director Guillaume Marie Jean Rutten reported a small equity-based compensation adjustment. He received a grant of 2.5166 restricted stock units as dividend equivalent units that accrued when a dividend was paid on June 23, 2026 on his existing time-vested RSUs granted on May 13, 2026. After this accrual, his reported holdings in these restricted stock units increased to 2615.5166 units, reflecting routine compensation mechanics rather than an open-market transaction.

Insider Trade Summary

Grant/Award: 2.5166 shares

Grant/Award 1 txn

Insider Rutten Guillaume Marie Jean

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	2.5166	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 2,615.5166 contracts (Direct)

Holdings Before and After: Restricted Stock Units, 2,613 to 2,615.5166 contracts (Direct)

Footnotes (1)

1. F1. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on June 23, 2026 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (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

RSUs granted: 2.5166 units Total RSUs after transaction: 2615.5166 units Original RSU grant date: May 13, 2026 +1 more

4 metrics

RSUs granted 2.5166 units Dividend equivalent restricted stock units accrued June 23, 2026

Total RSUs after transaction 2615.5166 units Reported RSU holdings following June 23, 2026 grant

Original RSU grant date May 13, 2026 Time-vested RSUs to which the DEUs relate

Dividend date for DEUs June 23, 2026 Date dividend was paid, triggering DEU accrual

Key Terms

Restricted Stock Units, dividend equivalent units, time-vested restricted stock units, RSUs

4 terms

Restricted Stock Units financial

"security_title: "Restricted Stock Units"; underlying_security_title: "Common Stock""

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

dividend equivalent units financial

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

Dividend equivalent units are bookkeeping credits that mirror cash dividends paid on actual shares, granted to holders of stock-based awards such as restricted stock units or deferred compensation. They matter to investors because they increase a company’s reported employee compensation cost and can lead to issuance of more shares or cash payouts over time, similar to extra pay linked to ownership that affects shareholder dilution and corporate cash flow.

time-vested restricted stock units financial

"with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc."

RSUs financial

"Each DEU represents an additional RSU subject to the same provisions"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

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

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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^*

Rutten Guillaume Marie Jean

(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)
06/23/2026

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)	06/23/2026		A		2.5166		(1)	(1)	Common Stock	2.5166	$0	2,615.5166	D

Explanation of Responses:

1. Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on June 23, 2026 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (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 Guillaume Marie Jean Rutten	06/25/2026
	** 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)