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

Rhea-AI Filing Summary

Amkor Technology (AMKR) director and 10% owner Susan Y. Kim reported several internal trust-related movements of Amkor common stock on November 20, 2025, all at a reported price of $0 per share. A 2024 Grantor Retained Annuity Trust (GRAT) for Susan Y. Kim distributed 876,000 shares to her directly, changing her holdings from indirect to direct ownership. Separate 2024 GRATs for James J. Kim and Agnes C. Kim distributed 965,000 and 705,000 shares, respectively, to other family trusts where she serves as trustee or co-trustee.

After these transactions, Susan Y. Kim reports substantial indirect beneficial ownership through multiple vehicles, including 3,453,610 shares held by family trusts (excluding GRATs), 3,800,000 shares held by certain GRATs, 19,484,809 shares held by Sujochil, LP, 16,710,668 shares held by Kim Capital Partners - KCP, LLC, and 3,789,479 shares held by Sujoda Investments, LP. She disclaims beneficial ownership beyond her pecuniary interest in these holdings.

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 SUSAN Y

(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)

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

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)	A	$0	5,332,494	D
Common Stock	11/20/2025		G		876,000(1)	D	$0	2,607,000	I(2)(3)(4)	By own GRATs
Common Stock	11/20/2025		G		965,000(5)	D	$0	3,453,610	I(2)(3)(4)	By trusts (excl. GRATs)
Common Stock	11/20/2025		A		965,000(5)	A	$0	4,418,610	I(2)(3)(4)	By trusts (excl. GRATs)
Common Stock	11/20/2025		G		705,000(6)	D	$0	3,713,610	I(2)(3)(4)	By trusts (excl. GRATs)
Common Stock								19,484,809	I(2)(3)(4)	By Sujochil, LP
Common Stock								16,710,668	I(2)(3)(4)	By Kim Capital Partners - KCP, LLC
Common Stock								3,789,479	I(2)(3)(4)(7)	By Sujoda Investments, LP
Common Stock								2,200,000	I(2)(3)(4)	By James J. Kim 2024 GRAT dtd. 8/5/24
Common Stock								1,600,000	I(2)(3)(4)	By Agnes C. Kim 2024 GRAT dtd. 8/5/24

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 Susan Y. Kim dtd. 8/5/2024 distributed 876,000 shares of the Common Stock of Amkor Technology, Inc (the "Issuer") to the Reporting Person. The Reporting Person is the sole trustee of the 2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024. Because the Reporting Person is the annuitant and sole trustee of the 2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024, 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.

2. The Reporting Person is (i) a trustee of trusts for the benefit of her immediate family members (other than grantor retained annuity trusts ("GRATs")) which own 3,453,610 shares of the Common Stock of the Issuer); (ii) a trustee of GRATs for the benefit of members of her immediate family which own 3,800,000 shares of the Issuer's Common Stock; (iii) a trustee of GRATs of which the Reporting Person was the settlor and is the sole annuitant which own 2,607,00 shares of the Issuer's Common Stock; (iv) a general partner of a limited partnership (Sujochil, LP) which owns 19,484,809 shares of the Issuer's Common Stock

3. (Continued from Footnote 2) (v) a manager of a limited liability company being treated as a corporation for purposes of Section 16 which owns 16,710,668 shares of the Issuer's Common Stock and (vi) as referenced in Footnote 9, below, a member of Sujoda Management, LLC, which indirectly owns 3,789,479 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.

4. 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.

5. 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 the Issuer to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18. The Reporting Person is the trustee of the 2024 Grantor Retained Annuity Trust of James J. Kim 8/5/2024. The Reporting Person and James J. Kim are co-trustees of the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18.

6. On November 20, 2025, the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024 distributed 705,000 shares of the Common Stock of Amkor Technology, Inc (the "Issuer") to the the Agnes C. Kim Revocable Trust, of which Agnes C. Kim is the sole settlor, sole beneficiary, and sole trustee. Susan Y. Kim is the sole trustee of the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024.

7. The sole general partner of Sujoda Investments, LP is Sujoda Management, LLC. The Reporting Person is one of three members of Sujoda Management, LLC. Sujoda Management, LLC is being treated as a limited partnership for purposes of Section 16, and, pursuant to the Form 4 instructions, the Reporting Person has elected to treat all of the shares of the Issuer's Common Stock owned by Sujoda Investments, LP as beneficially owned by the Reporting Person.

Remarks:

8. 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/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim	11/23/2025
	** 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 activity did AMKR director Susan Y. Kim report on this Form 4?

The filing reports internal transfers of Amkor Technology, Inc. (AMKR) common stock among grantor retained annuity trusts (GRATs), family trusts, and Susan Y. Kim personally, with no cash consideration ($0 price) and characterized as changes in the form of ownership.

How many AMKR shares did Susan Y. Kim receive directly from a GRAT?

On November 20, 2025, the 2024 Grantor Retained Annuity Trust of Susan Y. Kim dated 8/5/2024 distributed 876,000 shares of Amkor common stock to her. She is the annuitant and sole trustee of that GRAT.

What other major trust distributions of AMKR stock are disclosed?

The filing states that on November 20, 2025, a 2024 GRAT for James J. Kim distributed 965,000 shares to the James J. Kim 2018-1 Qualified Annuity Trust, and a 2024 GRAT for Agnes C. Kim distributed 705,000 shares to the Agnes C. Kim Revocable Trust.

What indirect AMKR holdings are attributed to Susan Y. Kim through family trusts and GRATs?

The report notes that trusts for her immediate family (excluding GRATs) hold 3,453,610 shares, certain GRATs for family members hold 3,800,000 shares, and GRATs of which she is settlor and sole annuitant hold 2,607,000 shares of Amkor common stock.

Which investment entities holding AMKR shares are associated with Susan Y. Kim?

The filing identifies her as general partner of Sujochil, LP holding 19,484,809 shares, a manager of Kim Capital Partners - KCP, LLC holding 16,710,668 shares, and a member of Sujoda Management, LLC, which indirectly controls 3,789,479 shares via Sujoda Investments, LP.

Does Susan Y. Kim claim full beneficial ownership of all these AMKR shares?

No. She disclaims beneficial ownership of the reported securities except to the extent of her pecuniary interest. The report states it should not be deemed an admission of beneficial ownership beyond that interest for Section 16 or any other purpose.