As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Amkor Technology, Inc. The largest reported stake is James J. Kim's, at 30.4%. 4 filings are on record since February 17, 2026 (Schedule 13D/A, May 5, 2026).
Sell to companies like Amkor Technology, Inc? Enter your website and see 10 with a filed reason to buy from you this month. Free.
Opens in a new tab. No signup.
Key facts
- · Reporting person: James J. Kim · Sole voting: 511,645 · Shared voting: 0 · Sole dispositive: 511,645 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-05-05
- · Holder: Dimensional Fund Advisors LP · Percent: 4.4% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: James J. Kim · Percent: 30.5% · SCHEDULE 13D/A
Amkor Technology, Inc. has 4 Schedule 13D or 13G filings on record since 2026-02-17. 1 holder's latest filing reports 5% or more of common stock, par value $0.001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 30.4% | 511,645 | SCHEDULE 13D/A, 2026-05-05 | 2026-05-01 | |
| Dimensional Fund Advisors LP | 4.4% | 10,991,469 | SCHEDULE 13G/A, 2026-04-09 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Holding shares or following this stake? See who's behind Amkor Technology, Inc. and the warning signs.
Free to see. No signup.
Keep reading
More on Amkor Technology, Inc. and the records around it.
Amkor Technology, Inc. elsewhere on the record
Companies that share a holder
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
Watch Amkor Technology, Inc.
Get an email when Amkor Technology, Inc. files again: a new raise, a leadership change, a layoff or an IPO filing. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
Want the whole picture on Amkor Technology, Inc.?
Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
A Full Report on Amkor Technology, Inc.: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on Amkor Technology, Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
4 cited sources found
Plus the sections for what you are deciding, which you pick after ordering.
A real finished report, first screen. Opens in a new tab.
Not ready to order yet? Keep this snapshot.
Sends this preview to you once; we won't add you to any list
Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| James J. Kim | 511,645 | 0 | 511,645 | 0 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim, as Trustee | 0 | 10,511,032 | 0 | 10,511,032 | SCHEDULE 13D/A, 2026-05-05 |
| Agnes C. Kim | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-05-05 |
| John T. Kim | 38,978,948 | 36,360,155 | 35,189,469 | 40,149,634 | SCHEDULE 13D/A, 2026-05-05 |
| John T. Kim, as Trustee | 9,345,483 | 8,264,500 | 8,847,251 | 18,863,764 | SCHEDULE 13D/A, 2026-05-05 |
| David D. Kim | 8,746 | 0 | 8,746 | 3,789,479 | SCHEDULE 13D/A, 2026-05-05 |
| David D. Kim, as Trustee | 1,363,400 | 1,335,113 | 1,363,400 | 1,335,113 | SCHEDULE 13D/A, 2026-05-05 |
| Susan Y. Kim | 9,999,973 | 19,484,809 | 6,210,494 | 23,274,288 | SCHEDULE 13D/A, 2026-05-05 |
| Susan Y. Kim, as Trustee | 9,351,594 | 7,539,500 | 9,036,594 | 8,352,732 | SCHEDULE 13D/A, 2026-05-05 |
| Liam E. Blaney | 0 | 16,875,346 | 0 | 16,875,346 | SCHEDULE 13D/A, 2026-05-05 |
| John T. Kim Trust of December 31, 1987 | 7,594,001 | 0 | 7,594,001 | 0 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim for Jacqueline Mary Panichello dated 10/3/94 | 0 | 961,113 | 0 | 961,113 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim for Alexandra Kim Panichello dated 12/24/92 | 0 | 961,113 | 0 | 961,113 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim for Dylan James Panichello dated 10/15/01 | 0 | 961,113 | 0 | 961,113 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim for Allyson Lee Kim dated 10/15/01 | 0 | 961,113 | 0 | 961,113 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim FBO Jason Lee Kim dated 11/17/03 | 0 | 961,113 | 0 | 961,113 | SCHEDULE 13D/A, 2026-05-05 |
| Irrevocable Deed of Trust of James J. Kim f/b/o Children of David D. Kim dated 11/11/05 | 0 | 1,335,113 | 0 | 1,335,113 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim 2008 Trust FBO Alexandra Kim Panichello and Descendants dated 2/5/08 | 0 | 546,787 | 0 | 546,787 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim 2008 Trust FBO Jacqueline Mary Panichello and Descendants dated 2/5/08 | 0 | 546,787 | 0 | 546,787 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim 2008 Trust FBO Dylan James Panichello and Descendants dated 2/5/08 | 0 | 546,787 | 0 | 546,787 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim 2008 Trust FBO Descendants of John T. Kim dated 2/5/08 | 0 | 1,093,574 | 0 | 1,093,574 | SCHEDULE 13D/A, 2026-05-05 |
| James J. Kim 2008 Trust FBO Descendants of David D. Kim dated 2/5/08 | 1,363,400 | 0 | 1,363,400 | 0 | SCHEDULE 13D/A, 2026-05-05 |
| The James and Agnes Kim Foundation, Inc. | 1,150,000 | 0 | 1,150,000 | 0 | SCHEDULE 13D/A, 2026-05-05 |
| 915 Investments, LP | 29,594,980 | 0 | 29,594,980 | 0 | SCHEDULE 13D/A, 2026-05-05 |
The latest filing identifies Amkor Technology, Inc. by CUSIP 031652100 and gives its principal executive office as 2045 East Innovation Circle, Tempe, AZ 85284 (SCHEDULE 13D/A, 2026-05-05).
Purpose of Transaction (Item 4)
James J. Kim
N/AItem 4 of the SCHEDULE 13D/A filed 2026-05-05
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-17 | James J. Kim | 30.5% | SCHEDULE 13D/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-09 | Dimensional Fund Advisors LP | 4.4% | SCHEDULE 13G/A |
| 2026-05-05 | James J. Kim | 30.4% | SCHEDULE 13D/A |
Questions about who owns Amkor Technology, Inc.
Who owns Amkor Technology, Inc.?
On this page, one holder's latest ownership filing reports 5% or more of Amkor Technology, Inc.: James J. Kim (30.4%, Schedule 13D/A, filed 2026-05-05).
When did James J. Kim buy into Amkor Technology, Inc.?
The filings give report dates, not purchase dates. The earliest filing from James J. Kim on this page is the Schedule 13D/A, filed 2026-02-17, reporting 30.5%; its latest, Schedule 13D/A filed 2026-05-05, reports 30.4%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 4 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Tools for this story
Each opens in a new tab, filled in for Amkor Technology, Inc.. With no account yet, you sign up free and land on the result.
Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.