STOCK TITAN

Kim family (NASDAQ: AMKR) holds 49.38% stake, adds $250M margin line

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

Amkor Technology’s largest shareholders, the Kim family and related trusts and entities, report beneficial ownership of 122,666,110 common shares, or about 49.38% of Amkor’s outstanding stock. This figure includes 550,000 shares that may be acquired through options exercisable within sixty days of May 1, 2026.

The ownership percentage is based on 247,872,518 Amkor shares outstanding as of April 21, 2026. The filing also details a new secured margin line of credit of up to $250 million from JPMorgan to Kim Capital Partners – KCP, LLC, backed by a pledge of 16,710,668 Amkor shares and guaranteed by Susan Y. Kim and a related trust.

Positive

  • None.

Negative

  • None.

Insights

Kim family reaffirms near-50% Amkor stake and refinances a large share-backed margin line.

The filing shows the Kim family group beneficially owns 122,666,110 Amkor shares, about 49.38% of outstanding stock, based on 247,872,518 shares as of April 21, 2026. This confirms continued concentrated control through individuals, trusts, partnerships, and family entities.

The document also describes replacing a prior margin facility with a new secured margin line of credit of up to $250 million from JPMorgan to Kim Capital Partners – KCP, LLC, maturing no later than May 1, 2028. The loan is secured by 16,710,668 Amkor shares and guaranteed by Susan Y. Kim and a related trust. Actual market impact depends on future collateral actions or potential lender remedies if events of default occur.

Group beneficial ownership 122,666,110 shares Total Amkor common shares beneficially owned by the Kim group
Ownership percentage 49.38% Portion of Amkor outstanding common stock held by the group
Shares outstanding 247,872,518 shares Amkor common shares outstanding as of April 21, 2026
Exercisable options included 550,000 shares Options exercisable within 60 days of May 1, 2026
New margin line capacity $250 million Secured margin line of credit to Kim Capital Partners – KCP, LLC
Pledged collateral shares 16,710,668 shares Amkor shares pledged to secure the new margin note
Margin loan maturity May 1, 2028 Latest stated due date for margin loans under the new note
Schedule 13D regulatory
"The Initial 13D is hereby further amended to furnish the additional information set forth in this Amendment No. 21"
A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.
beneficially owned financial
"indicating the aggregate number and percentage of shares of Common Stock of the Issuer beneficially owned by each Reporting Person"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
secured margin line of credit note financial
"entered into a secured margin line of credit note (the "Original Note") with JPMorgan Chase Bank, N.A."
grantor retained annuity trust financial
"2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim"
A grantor retained annuity trust (GRAT) is an estate-planning tool where the person who creates the trust transfers assets into it but receives fixed cash payments (an annuity) from the trust for a set number of years; whatever remains after that term passes to designated beneficiaries. It matters to investors because it can shift future appreciation of assets out of the creator’s taxable estate—like putting an asset into a timed vending machine that pays you fixed amounts while any extra value that grows inside the machine goes to heirs with reduced gift or estate tax consequences.
Guaranty Agreement regulatory
"The Guaranty Agreement, dated as of May 1, 2026, by and among the Bank, Susan Y. Kim and the SYK 2007 Trust is filed as Exhibit 99.2"
A guaranty agreement is a legal contract in which one party (the guarantor) promises to pay a debt or perform an obligation if the primary borrower or obligor does not. Think of it like a friend co-signing a loan: it makes creditors more comfortable because someone else has agreed to back the obligation. For investors, guaranties change credit risk and potential recoveries in a default and can create contingent liabilities for the guarantor.
event of default financial
"upon the occurrence of certain events of default, the Bank may exercise its rights with respect to the collateral"
An event of default is a specific breach of a loan or bond agreement—such as missed payments or breaking agreed rules—that gives lenders the legal right to act, for example by demanding immediate repayment, seizing collateral, or accelerating other obligations. For investors, it’s a red flag because it can sharply reduce a company’s ability to operate or raise money, like a car lender repossessing a vehicle after missed payments, and often leads to falling share or bond prices.





031652100

(CUSIP Number)
James J. Kim
1500 E. Lancaster Avenue,
Paoli, PA, 19301-9713
(480) 575-7253


Brian D. Short, Esq.
1735 Market Street, 51st Floor
Philadelphia, PA, 19103
(215) 864-8230

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
05/01/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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Comment for Type of Reporting Person:
Non-profit corporation


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SCHEDULE 13D


James J. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-fact
Date:05/05/2026
James J. Kim, as Trustee
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
Agnes C. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
John T. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
John T. Kim, as Trustee
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
David D. Kim
Signature:/s/ Kenneth R. Hillier, Attorney-in-Fact
Name/Title:Kenneth R. Hillier, Attorney-in-Fact
Date:05/05/2026
David D. Kim, as Trustee
Signature:/s/ Kenneth R. Hillier, Attorney-in-Fact
Name/Title:Kenneth R. Hillier, Attorney-in-Fact
Date:05/05/2026
Susan Y. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
Susan Y. Kim, as Trustee
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
Liam E. Blaney
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Brian D. Short, Attorney-in-Fact
Date:05/05/2026
John T. Kim Trust of December 31, 1987
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05
Signature:/s/ Kenneth R. Hillier, Attorney in Fact
Name/Title:David D. Kim, as Trustee
Date:05/05/2026
James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08
Signature:/s/ Kenneth R. Hillier, Attorney in Fact
Name/Title:David D. Kim, as Trustee
Date:05/05/2026
The James and Agnes Kim Foundation, Inc.
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Secretary
Date:05/05/2026
915 Investments, LP
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as General Partner
Date:05/05/2026
John T. Kim 2007 Children's Trust U/A dated 12/28/07
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Sujoda Investments, LP
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Manager of Sujoda Management, LLC, its General Partner
Date:05/05/2026
John T. Kim 2012 Generation-Skipping Trust U/A Dated 12/11/12
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:James J. Kim, as Trustee
Date:05/05/2026
Family Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:James J. Kim, as Trustee
Date:05/05/2026
Sujochil, LP
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as General Partner
Date:05/05/2026
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as General Partner
Date:05/05/2026
Sujoda Management, LLC
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, Manager
Date:05/05/2026
Susins, LLC
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, Manager
Date:05/05/2026
2023 Grantor Retained Annuity Trust of James J. Kim dtd. 4/26/2023
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
2023 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 4/26/2023
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
Kim Capital Partners - KCP, LLC
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, Manager
Date:05/05/2026
2024 Grantor Retained Annuity Trust of Susan Y. Kim dtd. 8/5/2024
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
2024 Grantor Retained Annuity Trust of Agnes C. Kim dtd. 8/5/2024
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
John T. Kim 2024 GRAT #1 dtd. 08/09/2024
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
John T. Kim 2024 GRAT #2 dtd. 08/09/2024
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
Susan Y. Kim 2023 Family Distribution Trust
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:John T. Kim, as Trustee
Date:05/05/2026
2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026
2025 Grantor Retained Annuity Trust No.1 of James J. Kim
Signature:/s/ Brian D. Short, Attorney-in-Fact
Name/Title:Susan Y. Kim, as Trustee
Date:05/05/2026

FAQ

What margin loan is disclosed for Kim Capital Partners – KCP, LLC in the Amkor (AMKR) filing?

Kim Capital Partners – KCP, LLC entered a new secured margin line of credit note with JPMorgan Chase Bank for up to $250 million. The facility allows variable and short-term fixed margin loans and replaces a prior note that was paid off and terminated on May 1, 2026.

Which Amkor (AMKR) shares secure the new JPMorgan margin line for Kim Capital Partners?

The new margin line of credit is secured by a pledge of 16,710,668 Amkor common shares held by Kim Capital Partners – KCP, LLC. If specified events of default occur, JPMorgan may exercise its rights with respect to this pledged collateral, as is typical for such agreements.

Is Amkor Technology (AMKR) itself a party to the Kim family’s new margin loan?

No. The filing states that neither Amkor Technology, Inc. nor any of its subsidiaries are parties to the new margin note. The obligations are between JPMorgan and Kim Capital Partners – KCP, LLC, and are guaranteed by Susan Y. Kim and the SYK 2007 Trust.

How is the Kim family’s beneficial ownership percentage in Amkor (AMKR) calculated?

The group’s 49.38% beneficial ownership is calculated using 247,872,518 Amkor shares outstanding as of April 21, 2026, as reported in the company’s Form 10-Q. The number is increased to include 550,000 shares that may be acquired through options exercisable within sixty days of May 1, 2026.