AMKR Form 4: CEO Guillaume Rutten sells 10,000 shares at $30.74

Rhea-AI Filing Summary

Amkor Technology (AMKR) reported an insider transaction by President, CEO, and Director Guillaume Marie Jean Rutten. On 10/15/2025, he sold 10,000 shares of common stock at $30.74 per share under a pre‑arranged Rule 10b5-1 trading plan adopted on June 06, 2025.

After this sale, Rutten beneficially owns 356,699 shares, held directly. This Form 4 indicates a routine, disclosed transaction executed pursuant to a trading plan designed to provide structured selling parameters.

Insights

Insider transactions analyst

Routine Form 4: planned CEO sale of 10,000 shares at $30.74.

Guillaume Rutten, Amkor’s President, CEO, and Director, sold 10,000 shares on 10/15/2025 at $30.74 per share. The filing states the sale was executed under a Rule 10b5-1 trading plan adopted on June 06, 2025, indicating a pre‑set schedule independent of day‑to‑day discretion.

Following the transaction, Rutten reports 356,699 shares beneficially owned, held directly. The disclosure is administrative in nature; it does not address company operations or outlook.

Future implications depend on additional filings and corporate updates; this specific entry records a single planned sale and the updated beneficial ownership.

Insider Trade Summary

Net Seller: 10,000 shares ($307,400)

Net Sell 1 txn

Insider Rutten Guillaume Marie Jean

Role President and CEO

Sold 10,000 shs ($307K)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,000	$30.74	$307K

Holdings After Transaction: Common Stock — 356,699 shares (Direct)

Footnotes (1)

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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)
10/15/2025

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	10/15/2025		S(1)		10,000	D	$30.74	356,699	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.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten	10/17/2025
	** 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 disclose?

The President, CEO, and Director, Guillaume M. J. Rutten, sold 10,000 shares of common stock at $30.74 on 10/15/2025.

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

Yes. The filing states the sale was made under a Rule 10b5-1 trading plan adopted on June 06, 2025.

How many AMKR shares does the CEO own after the sale?

Following the transaction, he beneficially owns 356,699 shares, held directly.

What was the price per share for the AMKR insider sale?

The reported price per share was $30.74.

What roles does the reporting person hold at AMKR?

He is a Director and an Officer, serving as President and CEO.

What SEC form reported this AMKR insider trade?

It was reported on Form 4.