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

Rhea-AI Filing Summary

Amkor Technology, Inc. (AMKR) reported an insider ownership change involving 876,000 shares of common stock. On November 20, 2025, a reporting person that is a member of a 10% owner group distributed 876,000 shares of Amkor common stock to Susan Y. Kim. She is the annuitant and sole trustee of the reporting person, so this movement is described as a mere change in the form of ownership from indirect to direct. The transaction was coded as "G" with a price of $0, and following the distribution, 1,124,000 shares were reported as beneficially owned on a direct basis.

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^*

2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024

(Last) (First) (Middle)

C/O SIANA CARR O'CONNOR & LYNAM

1500 EAST LANCASTER AVENUE

(Street)

PAOLI PA 19301-9713

(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
	Officer (give title below)	X	Other (specify below)
			Member of 10% owner group (2)

3. Date of Earliest Transaction (Month/Day/Year)
11/20/2025

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	11/20/2025		G		876,000(1)	D	$0	1,124,000	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. On November 20, 2025, the Reporting Person distributed 876,000 shares of the Common Stock of Amkor Technology, Inc. to Susan Y. Kim. Susan Y. Kim is the sole trustee of the Reporting Person. Because Susan. Y. Kim is the annuitant and sole trustee of the Reporting Person, the distribution was a mere change in the form of ownership from indirect to direct and thus being voluntarily reported by the Reporting Person on this Form 4.

Remarks:

(2) The Reporting Person states that the filing of this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities owned by the other members of the group, for the purpose of Section 16, or for any other purpose.

	/s/ Brian D. Short, Attorney-in-Fact	11/24/2025
	** 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.
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FAQ

What insider transaction did Amkor Technology (AMKR) report in this Form 4?

The filing reports that on November 20, 2025, a reporting person distributed 876,000 shares of Amkor Technology common stock to Susan Y. Kim, changing the holdings from indirect to direct ownership.

Who is Susan Y. Kim in relation to the reporting person in the AMKR Form 4?

Susan Y. Kim is identified as the annuitant and sole trustee of the reporting person, and she received 876,000 shares of Amkor Technology common stock in the reported transaction.

How many Amkor Technology (AMKR) shares were beneficially owned after the transaction?

After the reported transaction, the Form 4 states that 1,124,000 shares of Amkor Technology common stock were beneficially owned on a direct basis by the reporting person.

What transaction code was used for the AMKR insider transaction and what does it indicate?

The transaction used code "G", which in this context reflects a distribution treated as a mere change in the form of ownership from indirect to direct, with a reported price of $0 per share.

Does the AMKR Form 4 indicate that the reporting person is a 10% owner?

Yes. The relationship section shows the reporting person as a member of a 10% owner group, and the remarks clarify that this does not constitute an admission of beneficial ownership of securities owned by other group members.

Were any derivative securities reported for Amkor Technology (AMKR) in this Form 4?

No derivative securities are listed as acquired, disposed of, or beneficially owned in Table II of this Form 4; only common stock is reported in Table I.

Who signed the Amkor Technology (AMKR) Form 4 and on what date?

The Form 4 was signed by /s/ Brian D. Short, Attorney-in-Fact on November 24, 2025, acting on behalf of the reporting person.