Amkor Technology (AMKR) director exercises 20,000-share option, with tax share delivery

Rhea-AI Filing Summary

Amkor Technology director David N. Watson exercised stock options for 20,000 shares of common stock on February 25, 2026, converting a Director Stock Option granted in 2016 and fully vested in 2017. A portion of the resulting shares (2,223) was surrendered to cover tax obligations, with no shares bought or sold in the open market.

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^*

WATSON DAVID N

(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)
02/25/2026

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	02/25/2026		M		20,000	A	$5.66	122,980	D
Common Stock	02/25/2026		F(1)		2,223	D	$0	120,757	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)	$5.66	02/25/2026		M			20,000	05/04/2017(2)	05/04/2026(2)	Common Stock	20,000	$0	0	D

Explanation of Responses:

1. Exempt purchase under Section 16b-3. Transaction executed as net exercise executed with Amkor Technology, Inc. (the "Issuer"), in which no shares were purchased or sold in the open market.

2. This stock option to acquire 20,000 shares of the Issuer's Common Stock was granted on May 4, 2016 and vested in full on May 2, 2017.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for David N. Watson	02/26/2026
	** 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) director David N. Watson report?

David N. Watson reported exercising a Director Stock Option into 20,000 shares of Amkor common stock. The transaction occurred on February 25, 2026 and was structured as a net exercise directly with the company rather than through market purchases.

Was the Amkor (AMKR) David N. Watson Form 4 transaction an open-market trade?

No, the Form 4 states the transaction was a net exercise with Amkor Technology, Inc. No shares were purchased or sold in the open market; shares were issued and a portion was used to cover tax obligations.

What type of security did David N. Watson exercise at Amkor (AMKR)?

He exercised a Director Stock Option (Right-to-Buy) covering 20,000 shares of Amkor common stock. The option was originally granted on May 4, 2016 and had fully vested by May 2, 2017, according to the filing footnotes.

How many Amkor (AMKR) shares did David N. Watson dispose of for taxes?

The Form 4 shows a disposition of 2,223 shares of Amkor common stock. This transaction is coded as “F,” meaning shares were delivered to satisfy the exercise price or tax liability rather than being sold in the open market.

What is David N. Watson’s direct Amkor (AMKR) share ownership after the Form 4 transactions?

After exercising options and delivering shares for taxes, David N. Watson directly owns 120,757 shares of Amkor common stock. This figure reflects the non-derivative holdings reported as directly owned following the February 25, 2026 transactions.

At what price were David N. Watson’s Amkor (AMKR) options exercised?

The converted common stock is shown with a transaction price of $5.6600 per share. The filing notes this as part of an exempt, net exercise under Section 16b-3, carried out directly with Amkor Technology rather than through market trading.