Amkor (AMKR) director Rutten gains 41,478 shares from performance stock vesting

Rhea-AI Filing Summary

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

Amkor Technology director Guillaume Marie Jean Rutten reported the vesting of performance-based stock awards, increasing his direct common share holdings. On February 18, 2026, 10,891 shares of common stock vested from performance-vested restricted stock units granted on February 20, 2024, and 30,587 shares vested from units granted on February 20, 2025.

Both awards were granted under Amkor's Equity Incentive Plan and vested based on achieving a basic earnings per share performance goal over a one-year performance period from January 1, 2025 to December 31, 2025. Following these vestings, Rutten directly owns 380,789 shares of Amkor common stock.

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).

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 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)
02/18/2026

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
Common Stock	02/18/2026		A(1)		10,891	A	$0	350,202	D
Common Stock	02/18/2026		A(2)		30,587	A	$0	380,789	D

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

Explanation of Responses:

1. This Form 4 reports the vesting on February 18, 2026 of 10,891 shares of common stock of Amkor Technology, Inc. (the "Issuer") underlying performance-vested restricted stock units ("PSUs") granted to the Reporting Person on February 20, 2024 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic earnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025.

2. This Form 4 reports the vesting on February 18, 2026 of 30,587 shares of common stock of the Issuer's underlying PSUs granted to the Reporting Person on February 20, 2025 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic earnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	02/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did Amkor Technology (AMKR) report for Guillaume Rutten?

Amkor Technology reported that director Guillaume Marie Jean Rutten acquired common shares through vesting of performance stock units. On February 18, 2026, 10,891 and 30,587 shares vested from prior PSU grants under the company’s Equity Incentive Plan, with no cash purchase involved.

How many Amkor (AMKR) shares vested for Guillaume Rutten in this Form 4?

Two tranches of Amkor common stock vested for Guillaume Rutten, totaling 41,478 shares. This included 10,891 shares from PSUs granted on February 20, 2024 and 30,587 shares from PSUs granted on February 20, 2025, both tied to earnings per share performance.

What performance period governed the Amkor (AMKR) PSUs that vested for Guillaume Rutten?

The performance-vested restricted stock units for Guillaume Rutten were based on a basic earnings per share goal. The one-year performance period ran from January 1, 2025 through December 31, 2025, and successful attainment triggered vesting of the reported common shares.

What is Guillaume Rutten’s Amkor (AMKR) share ownership after the reported vesting?

After the reported PSU vesting transactions, Guillaume Marie Jean Rutten directly owns 380,789 shares of Amkor common stock. This total reflects the addition of 10,891 shares from a 2024 PSU grant and 30,587 shares from a 2025 PSU grant that vested on February 18, 2026.

Were the Amkor (AMKR) shares acquired by Guillaume Rutten bought on the open market?

No, the shares were not bought on the open market. They represent common stock issued at no cash cost upon vesting of performance-based restricted stock units granted under Amkor’s Equity Incentive Plan, contingent on achieving a basic earnings per share performance target.

Under what plan were Guillaume Rutten’s Amkor (AMKR) PSUs granted and vested?

The performance-vested restricted stock units were granted and vested pursuant to Amkor Technology’s Equity Incentive Plan, as amended. The related award agreements tied vesting to achievement of a basic earnings per share performance goal over a defined one-year period ending December 31, 2025.