James J. Kim - 01 May 2026 SCHEDULE 13D/A Report for Amkor Technology, Inc. Common Stock, par value $0.001 per share (AMKR)

Filing manager
James J. Kim
Reporting owner
John T. Kim
Security
Amkor Technology, Inc. Common Stock, par value $0.001 per share
Beneficially owned shares
75,339,103 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13D/A

Active or control-oriented beneficial ownership filing.

Ownership

30%

Beneficial ownership of this reported class.

Shares

75,339,103 shares

Shares beneficially owned as disclosed.

Event date

01 May 2026

Date tied to the ownership event or amendment.

Accepted by SEC

05 May 2026

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
30%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
AMKR
Shares outstanding
247,825,997 shares
Source evidence Original filing metadata and source links for verification. 5 source fields
SEC form
SCHEDULE 13D/A
Accepted by SEC
05 May 2026, 16:05:04 UTC
Event date
01 May 2026
Prior SEC filing
17 Feb 2026
Source filing
View source filing

Key filing fact

James J. Kim disclosed 30% ownership in Amkor Technology, Inc. Common Stock, par value $0.001 per share (AMKR) on 01 May 2026.

Key facts

  • James J. Kim filed SCHEDULE 13D/A for Amkor Technology, Inc. Common Stock, par value $0.001 per share (AMKR).
  • Disclosed ownership: 30%.
  • Date of event: 01 May 2026.

Change

  • Previous schedule filing date: 17 Feb 2026.
  • Current filing was accepted on 05 May 2026, 16:05.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (44)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
James J. Kim 0.2% 511,645 511,645 0 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-fact 0001158839
James J. Kim, as Trustee 4.2% 10,511,032 0 10,511,032 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
Agnes C. Kim 0% 0 0 0 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
John T. Kim 30% 75,339,103 38,978,948 36,360,155 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
John T. Kim, as Trustee 11% 27,711,015 9,345,483 8,264,500 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
David D. Kim 1.5% 3,798,225 8,746 0 /s/ Kenneth R. Hillier, Attorney-in-Fact Kenneth R. Hillier, Attorney-in-Fact
David D. Kim, as Trustee 1.1% 2,698,513 1,363,400 1,335,113 /s/ Kenneth R. Hillier, Attorney-in-Fact Kenneth R. Hillier, Attorney-in-Fact
Susan Y. Kim 12% 29,484,782 9,999,973 19,484,809 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
Susan Y. Kim, as Trustee 7% 17,389,326 9,351,594 7,539,500 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
Liam E. Blaney 6.8% 16,875,346 0 16,875,346 /s/ Brian D. Short, Attorney-in-Fact Brian D. Short, Attorney-in-Fact
John T. Kim Trust of December 31, 1987 3.1% 7,594,001 7,594,001 0 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94 0.4% 961,113 0 961,113 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92 0.4% 961,113 0 961,113 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01 0.4% 961,113 0 961,113 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01 0.4% 961,113 0 961,113 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03 0.4% 961,113 0 961,113 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05 0.5% 1,335,113 0 1,335,113 /s/ Kenneth R. Hillier, Attorney in Fact David D. Kim, as Trustee
James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08 0.2% 546,787 0 546,787 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08 0.2% 546,787 0 546,787 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08 0.2% 546,787 0 546,787 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 0.4% 1,093,574 0 1,093,574 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08 0.6% 1,363,400 1,363,400 0 /s/ Kenneth R. Hillier, Attorney in Fact David D. Kim, as Trustee
The James and Agnes Kim Foundation, Inc. 0.5% 1,150,000 1,150,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Secretary
915 Investments, LP 12% 29,594,980 29,594,980 0 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as General Partner
John T. Kim 2007 Children's Trust U/A dated 12/28/07 0.1% 315,000 315,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Sujoda Investments, LP 1.5% 3,789,479 3,789,479 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Manager of Sujoda Management, LLC, its General Partner
John T. Kim 2012 Generation-Skipping Trust U/A Dated 12/11/12 0.8% 1,957,350 1,957,350 0 /s/ Brian D. Short, Attorney-in-Fact James J. Kim, as Trustee
Family Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18 0.2% 498,232 498,232 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12 3.2% 7,828,682 7,828,682 0 /s/ Brian D. Short, Attorney-in-Fact James J. Kim, as Trustee
Sujochil, LP 7.9% 19,484,809 0 19,484,809 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as General Partner
Sujoda Management, LLC 1.5% 3,789,479 3,789,479 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, Manager
Susins, LLC 0.1% 164,678 0 164,678 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, Manager
2023 Grantor Retained Annuity Trust of James J. Kim dtd. 4/26/2023 0% 0 0 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
2023 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 4/26/2023 0% 0 0 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 0% 0 0 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
Kim Capital Partners - KCP, LLC 6.8% 16,710,668 0 16,710,668 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, Manager
2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024 0.5% 1,124,000 1,124,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024 0.5% 1,235,000 1,235,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
2024 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 8/5/2024 0.4% 895,000 895,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
John T. Kim 2024 GRAT #1 dtd. 08/09/2024 0.5% 1,194,000 1,194,000 0 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
John T. Kim 2024 GRAT #2 dtd. 08/09/2024 0% 59,250 59,250 0 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
Susan Y. Kim 2023 Family Distribution Trust 0.3% 725,000 0 725,000 /s/ Brian D. Short, Attorney-in-Fact John T. Kim, as Trustee
2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim 1% 2,538,000 2,538,000 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
2025 Grantor Retained Annuity Trust No.1 of James J. Kim 1.3% 3,244,594 3,244,594 0 /s/ Brian D. Short, Attorney-in-Fact Susan Y. Kim, as Trustee
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