Amkor Technology (AMKR) director reports 20,000-share option exercise and sale

Rhea-AI Filing Summary

Amkor Technology, Inc. director MaryFrances McCourt reported an insider transaction involving company common stock. On 12/12/2025, she exercised a director stock option (transaction code M) to acquire 20,000 shares of common stock at an exercise price of $19.39 per share, increasing her directly held position to 75,918 shares.

On the same date, she sold 20,000 shares of Amkor common stock (transaction code S) at a weighted average price of $46.02 per share, with individual trades executed between $45.98 and $46.09. After the sale, McCourt directly beneficially owned 55,918 shares of Amkor common stock. The option originally covered 20,000 shares, was granted on May 18, 2021, vested in full on May 17, 2022, and carries an expiration date of May 18, 2031.

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

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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^*

McCourt MaryFrances

(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)
12/12/2025

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	12/12/2025		M		20,000	A	$19.39	75,918	D
Common Stock	12/12/2025		S		20,000	D	$46.02(1)	55,918	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	12/12/2025		M			20,000	05/17/2022(2)	05/18/2031	Common Stock	20,000	$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 $45.98 to $46.09. 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. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 18, 2021 and vested in full on May 17, 2022.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for MaryFrances McCourt	12/16/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did Amkor Technology (AMKR) report in this filing?

The filing reports that director MaryFrances McCourt exercised a stock option for 20,000 shares of Amkor Technology, Inc. common stock at $19.39 per share and, on the same day, sold 20,000 shares of common stock in the open market.

How many Amkor Technology (AMKR) shares did MaryFrances McCourt sell, and at what price?

MaryFrances McCourt sold 20,000 shares of Amkor common stock at a weighted average price of $46.02 per share. The shares were sold in multiple transactions at prices ranging from $45.98 to $46.09.

What stock options did MaryFrances McCourt exercise in this Amkor (AMKR) transaction?

She exercised a director stock option with an exercise price of $19.39 per share covering 20,000 shares of Amkor common stock. This option was granted on May 18, 2021, vested in full on May 17, 2022, and has an expiration date of May 18, 2031.

How many Amkor Technology (AMKR) shares does MaryFrances McCourt own after the reported transaction?

Following the option exercise and subsequent sale, MaryFrances McCourt directly beneficially owned 55,918 shares of Amkor Technology, Inc. common stock.

What was McCourt's shareholding immediately after exercising the Amkor (AMKR) stock option and before the sale?

Immediately after exercising the option for 20,000 shares, McCourt directly beneficially owned 75,918 shares of Amkor common stock, prior to selling 20,000 shares later that day.

What role does MaryFrances McCourt hold at Amkor Technology (AMKR)?

MaryFrances McCourt is reported as a Director of Amkor Technology, Inc., as indicated in the relationship section of the filing.