Director Rutten converts RSUs into Amkor (AMKR) common stock

Rhea-AI Filing Summary

Amkor Technology director Guillaume Rutten reported equity compensation activity involving restricted stock units and common shares. On February 20, 2026, he exercised time-vested RSUs granted under Amkor’s Equity Incentive Plan from February 20, 2024 and February 20, 2025, converting them into common stock at no cash cost. The RSUs were awarded solely in exchange for his service as a company service provider and vest over three years under predefined schedules, resulting in the acquisition of blocks of common shares that he now holds directly.

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)
02/20/2026

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	02/20/2026		M		112,941	A	$0	493,730	D
Common Stock	02/20/2026		M		59,388	A	$0	553,118	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
Restricted Stock Units	$0	02/20/2026		M			112,941	(1)	(1)	Common Stock	112,941	$0	56,470	D
Restricted Stock Units	$0	02/20/2026		M			59,388	(2)	(2)	Common Stock	59,388	$0	118,795	D

Explanation of Responses:

1. Represents shares of Amkor Technology, Inc. (the "Issuer") common stock underlying time-vested restricted stock units ("RSUs") granted on February 20, 2024 (the "2024 Grant Date") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as a service provider of the Issuer and will vest over three years, with 40% of the RSUs vesting on each of the first anniversary and the second anniversary of the 2024 Grant Date, and 20% vesting on the third anniversary of the 2024 Grant Date, such that 100% will be vested on the third anniversary of the 2024 Grant Date.

2. Represents shares of the Issuer's common stock underlying time-vested RSUs granted on February 20, 2025 (the "2025 Grant Date") pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as a service provider of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2025 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2025 Grant Date.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	02/24/2026
	** 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.

FAQ

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

Amkor Technology (AMKR) reported that director Guillaume Rutten exercised time-vested restricted stock units, converting them into common shares. These RSUs were granted under the company’s Equity Incentive Plan and were earned as part of his service-based compensation over multi-year vesting schedules.

Were cash payments involved in Guillaume Rutten’s Amkor (AMKR) Form 4 transactions?

No cash payments were involved; the reported transactions reflect equity compensation. Rutten exercised restricted stock units at a price of $0.00 per share, receiving Amkor common stock solely in exchange for his past and ongoing service to the company.

What are the vesting terms of Guillaume Rutten’s February 20, 2024 Amkor RSU grant?

The February 20, 2024 RSU grant vests over three years. 40% of the units vest on each of the first and second anniversaries of the 2024 grant date, and 20% vest on the third anniversary, so all RSUs are fully vested by the third anniversary.

How do the February 20, 2025 Amkor (AMKR) RSUs for Guillaume Rutten vest?

The February 20, 2025 RSUs vest in three equal annual installments. One‑third vests on the first anniversary of the 2025 grant date and the remaining two‑thirds vest in equal portions on each of the next two anniversaries, reaching 100% vesting after three years.

What types of securities are involved in Guillaume Rutten’s Amkor Form 4 filing?

The filing involves restricted stock units and resulting common stock. Rutten exercised derivative securities (RSUs) into non-derivative Amkor common shares, with all positions reported as held directly under the company’s Equity Incentive Plan-based compensation framework.

Is Guillaume Rutten a director or officer of Amkor Technology (AMKR)?

Guillaume Rutten is identified as a director of Amkor Technology, Inc. in the filing. He is not listed as an officer and does not file as a ten percent owner, so these transactions reflect director-level equity compensation rather than executive officer trades.