Amkor Technology (AMKR) director reports option exercise and share sale

Rhea-AI Filing Summary

Amkor Technology director Winston J. Churchill reported exercising stock options and selling shares of the company. On 12/15/2025, he exercised options to buy 5,000 shares of common stock at an exercise price of $19.39 per share, then sold 5,000 shares of common stock at a price of $44.29 per share on the same date. After these transactions, he directly owned 25,888 shares of Amkor common stock. He also continued to hold 15,000 director stock options with a $19.39 exercise price, expiring on 05/18/2031. The option was originally granted on 05/18/2021 for 20,000 shares and fully vested on 05/17/2022.

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

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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^*

CHURCHILL WINSTON J

(Last) (First) (Middle)

500 SE MIZNER BLVD.

APT 305A

(Street)

BOCA RATON FL 33432-6083

(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)
12/15/2025

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	12/15/2025		M		5,000	A	$19.39	30,888	D
Common Stock	12/15/2025		S		5,000	D	$44.29	25,888	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
Director Stock Option (Right-to-Buy)	$19.39	12/15/2025		M			5,000	(1)	05/18/2031	Common Stock	5,000	$0	15,000	D

Explanation of Responses:

1. This stock option to acquire 20,000 shares of Common Stock of Amkor Technology, Inc. was granted on May 18, 2021 and vested in full on May 17, 2022.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Winston J. Churchill	12/17/2025
	** 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 Amkor Technology (AMKR) report in this filing?

The filing reports that director Winston J. Churchill exercised options for 5,000 shares of Amkor Technology common stock and sold 5,000 shares of common stock on 12/15/2025.

At what prices did the Amkor Technology (AMKR) director exercise options and sell shares?

He exercised director stock options at an exercise price of $19.39 per share and sold common stock at a sale price of $44.29 per share, both on 12/15/2025.

How many Amkor Technology (AMKR) shares does the director hold after the reported transactions?

Following the reported transactions, the director directly owned 25,888 shares of Amkor Technology common stock.

What stock options does the Amkor Technology (AMKR) director still hold?

He continues to hold 15,000 director stock options with an exercise price of $19.39 per share, expiring on 05/18/2031.

When were the Amkor Technology (AMKR) director stock options originally granted and when did they vest?

The stock option to acquire 20,000 shares of Amkor Technology common stock was granted on 05/18/2021 and vested in full on 05/17/2022, according to the explanation of responses.

What is the reporting person’s relationship to Amkor Technology (AMKR)?

The reporting person is identified as a Director of Amkor Technology, Inc., as indicated in the relationship section of the form.