Amkor (AMKR) President & CEO reports 10,000-share insider sale

Rhea-AI Filing Summary

Amkor Technology, Inc. insider transaction: the company’s President and CEO, Guillaume Marie Jean Rutten, reported selling 10,000 shares of Amkor common stock on 11/17/2025 at a weighted average price of $31.68 per share. The sale was coded as an open market sale and was made under a pre-arranged Rule 10b5-1 trading plan adopted on June 06, 2025, which is designed to allow insiders to sell shares according to a preset schedule. Following this transaction, Rutten beneficially owned 346,699 shares of Amkor common stock directly.

Insider Trade Summary

Net Seller: 10,000 shares ($316,800)

Net Sell 1 txn

Insider Rutten Guillaume Marie Jean

Role President and CEO

Sold 10,000 shs ($317K)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,000	$31.68	$317K

Holdings After Transaction: Common Stock — 346,699 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 $31.03 to $32.05. 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.

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
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
11/17/2025

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	11/17/2025		S(1)		10,000	D	$31.68(2)	346,699	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. 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 $31.03 to $32.05. 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.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	11/19/2025
	** 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 AMKR report for its CEO?

Amkor Technology, Inc. reported that its President and CEO, Guillaume Marie Jean Jean Rutten, sold 10,000 shares of common stock on 11/17/2025 in an open market transaction.

At what price were the AMKR shares sold in this Form 4?

The reported price in the Form 4 is a weighted average price of $31.68 per share, with individual trades executed between $31.03 and $32.05 per share.

How many AMKR shares does the CEO hold after this sale?

After the reported sale, the President and CEO beneficially owned 346,699 shares of Amkor Technology, Inc. common stock directly.

Was the AMKR CEO’s sale under a Rule 10b5-1 trading plan?

Yes. The filing states that the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 06, 2025.

What does the price range disclosure in the AMKR Form 4 mean?

The filing notes that the reported price is a weighted average, and the shares were sold in multiple transactions at prices ranging from $31.03 to $32.05. The reporting person has undertaken to provide detailed trade breakdowns upon request.

What is the relationship of the reporting person to AMKR?

The reporting person is identified as both a Director and an Officer of Amkor Technology, Inc., serving as President and CEO.