Key facts
- This page summarizes Susan Y. Kim's Form 4 filing for AMKOR TECHNOLOGY, INC. (AMKR).
- 1 reported transaction and 1 derivative row are listed below.
- Accepted by SEC: 02 Apr 2026, 18:55.
Susan Y. Kim - 31 Mar 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)
- Reporting relationship
- Director, Member of 10% owner group (6), 10%+ Owner
- Issuer ticker
- AMKR
- Reported as of
- 31 Mar 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 02 Apr 2026, 18:55:51 UTC
- Prior SEC filing
- 30 Dec 2025
- Next SEC filing
- 09 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Susan Y. Kim filed Form 4 for AMKOR TECHNOLOGY, INC. (AMKR) on 02 Apr 2026.
Change
- Previous filing in this sequence was filed on 30 Dec 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001158922
Primary reporting owner
KIM SUSAN Y
- Relationship
- Director, Member of 10% owner group (6), 10%+ Owner
- Address
- C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE, PAOLI
- Signature
- /s/ Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim
- Signature date
- 02 Apr 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 0
- Date
- 31 Mar 2026
- Ownership
- By Kim Capital Partners - KCP, LLC
- Footnotes
- F1
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 6,090,494
- Date
- 31 Mar 2026
- Ownership
- Direct
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,244,594
- Date
- 31 Mar 2026
- Ownership
- 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 2,538,000
- Date
- 31 Mar 2026
- Ownership
- 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,235,000
- Date
- 31 Mar 2026
- Ownership
- By James J. Kim 2024 GRAT dtd. 8/5/24
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 895,000
- Date
- 31 Mar 2026
- Ownership
- By Agnes C. Kim 2024 GRAT dtd. 8/5/24
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,124,000
- Date
- 31 Mar 2026
- Ownership
- By own GRATs
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,713,610
- Date
- 31 Mar 2026
- Ownership
- By trusts (excl. GRATs)
- Footnotes
- F2, F3
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,789,479
- Date
- 31 Mar 2026
- Ownership
- By Sujoda Investments, LP
- Footnotes
- F2, F3, F4
AMKR
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 19,484,809
- Date
- 31 Mar 2026
- Ownership
- By Sujochil, LP
- Footnotes
- F2, F3
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
AMKR
transaction
Derivative
Restricted Stock Units
Award
- Transaction value
- Shares
- +18
- Change %
- +0.18%
- Price
- $0.000000*
- Shares after
- 9,893
- Date
- 31 Mar 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 18
- Exercise price
- Footnotes
- F5
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 5 footnotes
Footnote F1
The Reporting Person resigned as a manager of Kim Capital Partners - KCP, LLC on April 1, 2026.
Footnote 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 3,713,610 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer"); (ii) a trustee of GRATs for the benefit of members of her immediate family which own 7,912,594 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 1,124,000 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; and (v) 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.
Footnote F3
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.
Footnote 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.
Footnote F5
Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on March 31, 2026 with respect to time-vested restricted stock units ("RSUs") of 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.
SEC 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.