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

Rhea-AI Filing Summary

Amkor Technology, Inc. insider James J. Kim reported a trust-to-trust transfer involving 965,000 shares of Amkor common stock. The Form 4 shows that on 11/21/2025, 965,000 shares were moved as a gift or similar transfer from the 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024 to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18, where he and Susan Y. Kim serve as co‑trustees.

After the transaction, 965,000 shares are reported as indirectly owned through trusts, with additional indirect holdings including shares held by his spouse and several family trusts. One disclosure notes that trusts for his immediate family members own 9,786,032 shares of Amkor common stock, and a related limited liability company holds 164,678 shares. Kim formally disclaims beneficial ownership beyond his pecuniary interest in these positions.

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^*

KIM JAMES J

(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	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of 10% owner group (4)

3. Date of Earliest Transaction (Month/Day/Year)
11/21/2025

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	11/21/2025		G		965,000(1)	A	$0	965,000	I	By trusts (excluding GRATs)
Common Stock								2,341,239	D
Common Stock								1,833,000(2)(3)	I	By Spouse
Common Stock								1,957,350(2)(3)	I	By John T. Kim G-S Trust dtd. 12/11/12
Common Stock								164,678(2)(3)	I	By self as Trustee of Trust U/A dtd. 12/11/12
Common Stock								7,828,682(2)(3)	I	By John T. Kim Family Trust U/A dtd. 12/11/12

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 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024 distributed 965,000 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18. The Reporting Person and Susan Y. Kim are co-trustees of the trust.

2. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

3. The Reporting Person is (i) a trustee of trusts for the benefit of his immediate family members which own 9,786,032 shares of the Issuer's Common Stock (ii) a trustee of a trust which is a controlling member of a limited liability company being treated as a corporation for purposes of Section 16, which limited liability company holds 164,678 shares of the Issuer's Common stock. Pursuant to the Form 4 instructions, the Reporting Person is being treated as having a pecuniary interest in all of such shares.

Remarks:

2. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose.

	/s/ Brian D. Short, Attorney-in-Fact for James J. Kim	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.
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 disclose in this Form 4?

The filing reports that 965,000 shares of Amkor Technology, Inc. common stock were transferred on 11/21/2025 from the 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024 to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18.

Who is the reporting person in the AMKR Form 4 and what is their role?

The reporting person is James J. Kim, identified as an insider of Amkor Technology, Inc. He reports multiple indirect holdings through trusts and a spouse, and serves as co‑trustee of the receiving trust with Susan Y. Kim.

How many AMKR shares were involved in the reported trust transfer?

The transaction involved 965,000 shares of Amkor Technology, Inc. common stock, described as a distribution from the 2024 Grantor Retained Annuity Trust to the James J. Kim 2018-1 Qualified Annuity Trust.

What indirect AMKR shareholdings related to James J. Kim are described?

The disclosure states that trusts for his immediate family members own 9,786,032 shares of Amkor common stock, and a limited liability company, controlled through a trust where he is trustee, holds an additional 164,678 shares.

Does James J. Kim claim full beneficial ownership of all the reported AMKR shares?

No. He disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest, and states that the report should not be deemed an admission of beneficial ownership for Section 16 or any other purpose.

How are James J. Kim’s AMKR holdings categorized in the Form 4?

The holdings are reported as both direct and indirect. Indirect positions include shares held by his spouse and various trusts, such as the James J. Kim Family Trust and other dated trusts where he serves as trustee.