Amkor (AMKR) director’s 10,000-share sale and RSU vesting detailed

Rhea-AI Filing Summary

AMKOR TECHNOLOGY, INC. director Guillaume Rutten reported mixed insider activity involving both an RSU vesting and a share sale. On February 17, 2026, he executed an open-market sale of 10,000 shares of common stock at a weighted average price of $45.89 under a pre-arranged Rule 10b5-1 trading plan adopted on June 06, 2025, leaving him with 339,311 common shares directly held. On February 16, 2026, he exercised 13,920 restricted stock units granted on February 16, 2023 into an equal number of common shares at no cost, tied to time-based vesting for his service, and reported 13,919 RSUs still outstanding after the transaction.

Insider Trade Summary

Net Seller: 10,000 shares ($458,900)

Net Sell 3 txns

Insider Rutten Guillaume Marie Jean

Role Director

Sold 10,000 shs ($459K)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,000	$45.89	$459K
Exercise	Restricted Stock Units	13,920	$0.00	--
Exercise	Common Stock	13,920	$0.00	--

Holdings After Transaction: Common Stock — 339,311 shares (Direct); Restricted Stock Units — 13,919 shares (Direct)

Footnotes (1)

1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 06, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.33 to $46.92. 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 (2) to this Form 4. Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in four equal annual installments beginning on the first anniversary of the RSU Grant Date.

Form 4 Insider Transactions: What Each Field Means →

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).

X

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)
02/16/2026

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	02/16/2026		M		13,920	A	$0	349,311	D
Common Stock	02/17/2026		S(1)		10,000	D	$45.89(2)	339,311	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(3)	02/16/2026		M			13,920	(3)	(3)	Common Stock	13,920	$0	13,919	D

Explanation of Responses:

1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 06, 2025.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.33 to $46.92. 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 (2) to this Form 4.

3. Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 16, 2023 (the "RSU Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in four equal annual installments beginning on the first anniversary of the RSU Grant Date.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	02/18/2026
	** 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 transactions did Guillaume Rutten report at AMKR?

Guillaume Rutten reported a mix of transactions: he sold 10,000 shares of Amkor common stock and exercised 13,920 restricted stock units into common shares. These moves reflect both a planned share sale and equity compensation vesting tied to his service.

At what price did the AMKR director sell his 10,000 shares?

The 10,000 Amkor shares were sold at a weighted average price of $45.89 per share. Footnotes state the sale occurred through multiple trades within a price range from $44.33 to $46.92, all executed under a pre-arranged Rule 10b5-1 trading plan.

How many Amkor shares does Guillaume Rutten hold after these Form 4 trades?

After the reported transactions, Guillaume Rutten directly holds 339,311 shares of Amkor common stock. He also reports 13,919 restricted stock units remaining outstanding, which represent additional potential common shares subject to time-based vesting conditions under Amkor’s 2021 Equity Incentive Plan.

What is the significance of the Rule 10b5-1 plan in this AMKR Form 4?

The Form 4 notes the 10,000-share sale was executed under a Rule 10b5-1 trading plan adopted June 06, 2025. Such plans pre-schedule trades, helping insiders systematically sell shares over time without making ad hoc trading decisions based on new nonpublic information.

What are the terms of Guillaume Rutten’s restricted stock units at Amkor?

The restricted stock units were granted February 16, 2023, under Amkor’s 2021 Equity Incentive Plan. They are time-vested awards that vest in four equal annual installments, beginning on the first anniversary of the grant date, in exchange for Guillaume Rutten’s ongoing service to the company.