Amkor director sells 20,000 shares after RSU exercise

AMKOR TECHNOLOGY, INC. director Guillaume Marie Jean Rutten exercised 10,748 restricted stock units on February 24, 2026, receiving 10,748 shares of common stock at no cash cost as part of prior equity awards.

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director Guillaume Marie Jean Rutten exercised 10,748 restricted stock units on February 24, 2026, receiving 10,748 shares of common stock at no cash cost as part of prior equity awards.

On the same date, he sold 20,000 common shares in open-market transactions at a weighted average price of $48.80 per share, with individual prices ranging from $48.80 to $48.86. After these transactions, he directly owned 543,866 shares of Amkor common stock.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Rutten Guillaume Marie Jean

Role Director

Sold 20,000 shs ($976K)

Approx. gross sale proceeds $976K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	10,748	$0.00	$0.00
Exercise	Common Stock	10,748	$0.00	$0.00
Sale	Common Stock	20,000	$48.80	$976K

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 543,866 shares (Direct)

Footnotes (2)

1. F1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.80 to $48.86. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1) to this Form 4.
2. F2. Represents shares of the Issuer's common stock underlying time-vested restricted stock units ("RSUs") on February 24, 2022 (the "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 vested in four equal annual installments beginning on the first anniversary of the Grant Date.

FAQ

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What insider transactions did Amkor (AMKR) director Guillaume Rutten report?

Guillaume Rutten reported exercising 10,748 restricted stock units and selling 20,000 Amkor common shares. The RSU exercise converted awards into shares at no cash cost, and the sale occurred in the open market at a weighted average price of $48.80 per share.

How many Amkor (AMKR) shares did the director sell and at what price range?

The director sold 20,000 Amkor common shares in multiple transactions. The weighted average sale price was $48.80 per share, with individual trades executed between $48.80 and $48.86, according to the detailed pricing footnote included with the reported transaction.

What was the size of Guillaume Rutten’s RSU exercise at Amkor (AMKR)?

He exercised 10,748 restricted stock units that had been granted under Amkor’s Equity Incentive Plan. These RSUs were originally awarded on February 24, 2022 and vested in four equal annual installments, reflecting compensation for his service to the company as a service provider.

How many Amkor (AMKR) shares does the director own after these Form 4 transactions?

Following the RSU conversion and subsequent share sale, Guillaume Rutten directly owns 543,866 shares of Amkor common stock. This figure reflects his updated direct holdings after exercising 10,748 RSUs and selling 20,000 shares in the reported open-market transactions.

What are the grant and vesting terms of the Amkor (AMKR) RSUs exercised?

The exercised RSUs were granted on February 24, 2022 under Amkor’s Equity Incentive Plan. They were time-vested awards that vested in four equal annual installments beginning on the first anniversary of the grant date, in exchange for his ongoing service to the company.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 02/26/2026 - 04:16 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^*

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)
02/24/2026

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	02/24/2026		M		10,748	A	$0	563,866	D
Common Stock	02/24/2026		S		20,000	D	$48.8(1)	543,866	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(2)	02/24/2026		M			10,748	(2)	(2)	Common Stock	10,748	$0	0	D

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.80 to $48.86. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1) to this Form 4.

2. Represents shares of the Issuer's common stock underlying time-vested restricted stock units ("RSUs") on February 24, 2022 (the "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 vested in four equal annual installments beginning on the first anniversary of the Grant Date.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	02/26/2026
	** 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.