Susan Y. Kim - 23 Sep 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
Director, Member of 10% owner group (10), 10%+ Owner
Signature
/s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim
Issuer symbol
AMKR
Transactions as of
23 Sep 2025
Net transactions value
$0
Form type
4
Filing time
25 Sep 2025, 16:46:36 UTC
Previous filing
05 Aug 2025
Next filing
24 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
KIM SUSAN Y Director, Member of 10% owner group (10), 10%+ Owner C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI /s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim 25 Sep 2025 0001158922

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding AMKR Common Stock 4,456,494 23 Sep 2025 Direct
holding AMKR Common Stock 19,484,809 23 Sep 2025 By Sujochil, LP F1, F2, F3
holding AMKR Common Stock 16,710,668 23 Sep 2025 By Kim Capital Partners - KCP, LLC F1, F2, F3
holding AMKR Common Stock 4,418,610 23 Sep 2025 By trusts (excl. GRATs) F1, F2, F3
holding AMKR Common Stock 3,789,479 23 Sep 2025 By Sujoda Investments, LP F1, F2, F3, F4
holding AMKR Common Stock 3,483,000 23 Sep 2025 By own GRATs F1, F2, F3
holding AMKR Common Stock 2,200,000 23 Sep 2025 By James J. Kim 2024 GRAT dtd. 8/5/24 F1, F2, F3
holding AMKR Common Stock 1,600,000 23 Sep 2025 By Agnes C. Kim 2024 GRAT dtd. 8/5/24 F1, F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction AMKR Restricted Stock Units Award $0 +27 +0.28% $0.000000 9,855 23 Sep 2025 Common Stock 27 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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.
F2 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
F3 (Continued from Footnote 3) (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.
F4 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.
F5 Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 23, 2025 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (the "Issuer") granted to the Reporting Person on May 15, 2025. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.

Remarks:

(6) 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.