[Form 4] AMKOR TECHNOLOGY, INC. Insider Trading Activity

Rhea-AI Filing Summary

Amkor Technology (AMKR) executive vice president Kevin Engel reported several small equity transactions on Form 4 related to restricted stock units (RSUs). On 11/14/2025, multiple RSU awards vested, each converting into common stock at an exercise price of $0. To cover taxes tied to his retirement eligibility status, the company withheld 30, 47, 223, and 369 shares of common stock at a price of $31.68 per share. After these transactions, Engel directly owned 11,321 shares of Amkor common stock, along with remaining RSU holdings shown across several grants. These are routine administrative transactions reflecting tax withholding on equity compensation rather than open-market buying or selling.

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^*

Engel Kevin

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

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	11/14/2025		M		30	A	$0	11,351	D
Common Stock	11/14/2025		F(1)		30	D	$31.68	11,321	D
Common Stock	11/14/2025		M		47	A	$0	11,368	D
Common Stock	11/14/2025		F(2)		47	D	$31.68	11,321	D
Common Stock	11/14/2025		M		223	A	$0	11,544	D
Common Stock	11/14/2025		F(3)		223	D	$31.68	11,321	D
Common Stock	11/14/2025		M		369	A	$0	11,690	D
Common Stock	11/14/2025		F(4)		369	D	$31.68	11,321	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
Restricted Stock Units	$0(1)	11/14/2025		M			30(1)	(1)	(1)	Common Stock	30	$0	910	D
Restricted Stock Units	$0(2)	11/14/2025		M			47(2)	(2)	(2)	Common Stock	47	$0	2,736	D
Restricted Stock Units	$0(3)	11/14/2025		M			223(3)	(3)	(3)	Common Stock	223	$0	12,942	D
Restricted Stock Units	$0(4)	11/14/2025		M			369(4)	(4)	(4)	Common Stock	369	$0	32,225	D

Explanation of Responses:

1. The reported transaction involved the withholding of 30 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.

2. The reported transaction involved the withholding of 47 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

3. The reported transaction involved the withholding of 223 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

4. The reported transaction involved the withholding of 369 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel	11/18/2025
	** 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 executive Kevin Engel report on this Form 4?

The filing shows early vesting of several restricted stock unit (RSU) grants for Kevin Engel, Amkor Technology's executive vice president, with shares used to cover related tax obligations.

How many AMKR shares were withheld for taxes from Kevin Engel’s RSU vesting?

Amkor withheld 30, 47, 223, and 369 shares of common stock, each tied to an equal number of vested RSUs, to pay taxes associated with Engel’s retirement eligibility status.

What price was used for the AMKR tax withholding transactions?

For each tax withholding transaction, Amkor used a share price of $31.68 when withholding common stock to satisfy Kevin Engel’s tax obligations.

How many AMKR common shares did Kevin Engel own after these transactions?

Following the reported transactions on 11/14/2025, Kevin Engel beneficially owned 11,321 shares of Amkor Technology common stock in direct ownership.

What RSU positions remain for Kevin Engel after the reported AMKR Form 4 activity?

After these RSU conversions and related tax withholding, Engel continued to hold several RSU awards, including grants with remaining balances such as 910, 2,736, 12,942, and 32,225 RSUs shown in the filing.

Does this AMKR Form 4 reflect open-market insider buying or selling?

No. The transactions involve RSU vesting and share withholding for taxes at $31.68 per share, rather than open-market purchases or sales by Kevin Engel.