[Form 4] Amkor Technology Inc Insider Trading Activity

Rhea-AI Filing Summary

Amkor Technology (AMKR) – Form 4 filed 8 Aug 2025 for 1 Aug 2025 transactions

Director/10% owner Susan Y. Kim disclosed several equity movements:

• Gifts/GRAT distributions (Code G): 438,002 and 280,000 shares moved from 2023 Grantor Retained Annuity Trusts to Kim; equal amounts were concurrently distributed to other family members, all at $0.
• Open-market purchase (Code P): Sujoda Investments LP, attributed to Kim, bought 441,589 shares at $21.85.

Post-transaction ownership

• Direct: 4,456,494 shares.
• Indirect: interests in family entities and trusts totaling about 51.7 million shares (19.48 m via Sujochil LP, 16.71 m via Kim Capital Partners, 4.42 m family trusts, 3.79 m Sujoda Investments, plus several GRATs).

No derivative securities were reported. Most changes stem from estate-planning reallocations, but the sizeable market purchase indicates ongoing insider confidence. Kim disclaims beneficial ownership beyond her pecuniary interest.

Positive

• 441,589-share open-market purchase at $21.85 signals insider confidence and injects roughly $9.7 m of personal/family capital into AMKR.

Negative

• None.

Insights

Securities Analyst

TL;DR: Insider family bought 0.44 m AMKR shares at $21.85; other transfers are bookkeeping—net message skews positive.

The only cash transaction is Sujoda Investments’ $9.7 m purchase (441,589 × $21.85), suggesting conviction at current valuation. Combined direct and indirect holdings exceed 56 m shares, keeping the Kim family a dominant shareholder, which can align interests with minorities but also concentrate control. Gift transactions merely reshuffle trust assets and do not constitute selling pressure. Overall, the filing signals continued accumulation rather than distribution.

Corporate Governance Expert

TL;DR: Trust-driven reallocations routine; purchase modest versus >50 m-share family stake—governance impact limited.

The GRAT and trust distributions follow typical wealth-transfer strategies and do not change effective control. Kim’s disclaimer highlights complex ownership structure that may obscure exact economic exposure, a transparency consideration for investors. The additional Sujoda purchase marginally tightens insider alignment but does not materially alter voting dynamics. Governance risk profile remains unchanged.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
08/01/2025

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	08/01/2025		G		438,002(1)	A	$0	4,176,494(2)	D
Common Stock	08/01/2025		G		280,000(3)	A	$0	4,456,494(2)(3)	D
Common Stock	08/01/2025		G		438,002(1)	D	$0	438,002(2)(4)	I(5)(6)	By James J. Kim 2023 GRAT dtd. 4/26/23
Common Stock	08/01/2025		G		438,002(4)	D	$0	0(2)(4)	I(5)(6)	By James J. Kim 2023 GRAT dtd. 4/26/23
Common Stock	08/01/2025		G		280,000(3)	D	$0	280,001(2)(7)	I(5)(6)	By Agnes C. Kim 2023 GRAT dtd. 4/26/23
Common Stock	08/01/2025		G		280,001(7)	D	$0	0(2)(7)	I(5)(6)	By Agnes C. Kim 2023 GRAT dtd. 4/26/23
Common Stock	08/01/2025		P		441,589(8)	A	$21.85	3,789,479(2)(9)	I(5)(6)	By Sujoda Investments, LP
Common Stock								19,484,809(2)(5)(6)	I	By Sujochil, LP
Common Stock								16,710,668(2)(5)(6)	I	By Kim Capital Partners - KCP, LLC
Common Stock								4,418,610(2)(5)(6)	I	By trusts (excl. GRATs)
Common Stock								3,483,000(2)(5)(6)	I	By own GRATs
Common Stock								2,200,000(2)(5)(6)	I	By James J. Kim 2024 GRAT dtd. 8/5/24
Common Stock								1,600,000(2)(5)(6)	I	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 August 1, 2025 the 2023 Grantor Retained Annuity Trust of James J. Kim Dated 4/26/2023 distributed 438,002 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to the Reporting Person.

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. On August 1, 2025 the 2023 Grantor Retained Annuity Trust of Agnes C. Kim Dated 4/26/2023 distributed 280,000 shares of the Common Stock of the Issuer to the Reporting Person.

4. On August 1, 2025, the 2023 Grantor Retained Annuity Trust of James J. Kim Dated 4/26/2023 distributed 438,002 shares of the Common Stock of the Issuer to John T. Kim and 438,002 shares of the Common Stock of the Issuer to the Reporting Person.

5. 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 4,418,610 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 3,483,000 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;

6. (Continued from Footnote 5) (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.

7. On August 1, 2025, the 2023 Grantor Retained Annuity Trust of Agnes C. Kim Dated 4/26/2023 distributed 280,001 shares of the Common Stock of the Issuer to John T. Kim and 280,000 shares of the Common Stock of the Issuer to the Reporting Person.

8. On August 1, 2025, James J. Kim distributed 441,589 shares of the Common Stock of the Issuer to Sujoda Investments, LP pursuant to the terms of a transaction between members of the Kim family group.

9. 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:

(10) 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.

	Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim	08/05/2025
	** 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

How many AMKR shares did Susan Y. Kim buy on 1 Aug 2025?

Sujoda Investments, LP—attributed to Kim—purchased 441,589 shares at $21.85 each.

What is Susan Y. Kim’s direct AMKR holding after these transactions?

She directly holds 4,456,494 common shares.

How large is Kim’s indirect stake in AMKR?

Through various family entities and trusts she is treated as owning ≈51.7 million shares.

Were any AMKR derivative securities reported in this Form 4?

No; the filing lists no options, warrants, or other derivatives.

Do the reported gift transactions represent sales of AMKR stock?

No. The Code G entries are tax-free trust distributions at $0, reflecting internal reallocations, not market sales.