As of October 27, 2026, 8 holders' latest Schedule 13D or 13G filings report owning 5% or more of ONE Nuclear Energy Inc. The largest reported stake is Highbridge Capital Management, LLC's, at 7.6%. 19 filings are on record since August 13, 2025 (Schedule 13G, February 17, 2026).
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Key facts
- · Holder: Hennessy Thomas D · Percent: 6% · SCHEDULE 13G/A
- · Holder: NCCS Management, LLC · Percent: 4.6% · SCHEDULE 13D
- · Holder: Glazer Capital, LLC · Percent: 5.08% · SCHEDULE 13G
- · Holder: W. R. Berkley Corporation · Percent: 5.6% · SCHEDULE 13G
- · Holder: Verbena Value LP · Percent: 6.21% · SCHEDULE 13G
ONE Nuclear Energy Inc. has 19 Schedule 13D or 13G filings on record since 2025-08-13. 8 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Highbridge Capital Management, LLC | 7.6% | 1,500,000 | SCHEDULE 13G, 2026-02-17 | 2025-12-31 |
| Linden Advisors LP | 7.4% | 1,463,732 | SCHEDULE 13G/A, 2026-02-12 | 2025-12-31 |
| North Rock Capital Management, LLC | 6.21% | 1,222,740 | SCHEDULE 13G, 2026-05-14 | 2026-03-31 |
| Verbena Value LP | 6.21% | 1,222,740 | SCHEDULE 13G, 2026-06-05 | 2025-12-31 |
| 6% | 6,494,999 | SCHEDULE 13G/A, 2026-10-26 | 2026-09-30 | |
| W. R. Berkley Corporation | 5.6% | 1,101,473 | SCHEDULE 13G, 2026-08-06 | 2026-06-30 |
| AQR Capital Management, LLC | 5.38% | 1,059,589 | SCHEDULE 13G/A, 2026-02-12 | 2025-12-31 |
| Glazer Capital, LLC | 5.08% | 999,993 | SCHEDULE 13G, 2026-08-13 | 2026-06-30 |
| Fort Baker Capital Management LP | 4.9% | 963,922 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| NCCS Management, LLC | 4.6% | 4,987,103 | SCHEDULE 13D, 2026-09-30 | 2026-09-23 |
| Meteora Capital, LLC | 1.18% | 232,623 | SCHEDULE 13G/A, 2025-12-05 | 2025-11-30 |
| Healthcare of Ontario Pension Plan Trust Fund | 1% | 200,000 | SCHEDULE 13G/A, 2025-08-13 | 2025-06-30 |
| Lighthouse Investment Partners, LLC | 0.3% | 58,100 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| The K2 Principal Fund, L.P. | 0.2% | 53,442 | SCHEDULE 13G/A, 2026-02-05 | 2025-12-31 |
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Purpose of Transaction (Item 4)
NCCS Management, LLC
The Fund acquired the securities reported herein pursuant the Forward Purchase Agreement, entered into for the purpose of acting as a potential financing pathway for the Issuer. The information set forth in Items 3, 5 and 6 of this Statement is incorporated by reference into this Item 4. Except as set forth in this Statement, the Reporting Persons have no present plans or proposals that relate to or would result in any of the actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D. Notwithstanding the foregoing, the Reporting Persons may determine, from time to time in the future, based on market and general economic conditions, the business affairs and financial conditions of the Issuer, the capital requirements of the Fund (or other Reporting Persons), the availability of securities at favorable prices and other alternative investment opportunities available to the Reporting Persons, and other factors that the Reporting Persons may deem relevant, to acquire additional shares of Common Stock and/or other equity, debt, notes, instruments or other securities of the Issuer (collectively, "Securities") in the open market, in privately negotiated transactions, or otherwise, or to sell some or all of the Securities they now hold or hereafter acquire as set forth above or otherwise. The Reporting Persons reserve the right to change their intention with respect to, and pursue plans or proposals that relate to or could result in, any and all matters referred to …The first part of Item 4 of the SCHEDULE 13D filed 2026-09-30; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-13 | Healthcare of Ontario Pension Plan Trust Fund | 1% | SCHEDULE 13G/A |
| 2025-08-14 | Meteora Capital, LLC | 7.12% | SCHEDULE 13G |
| 2025-11-14 | Fort Baker Capital Management LP | 5.1% | SCHEDULE 13G |
| 2025-11-14 | Meteora Capital, LLC | 6.68% | SCHEDULE 13G/A |
| 2025-12-05 | Meteora Capital, LLC | 1.18% | SCHEDULE 13G/A |
| 2026-02-05 | The K2 Principal Fund, L.P. | 0.2% | SCHEDULE 13G/A |
| 2026-02-12 | Glazer Capital, LLC | 2.74% | SCHEDULE 13G/A |
| 2026-02-12 | AQR Capital Management, LLC | 5.38% | SCHEDULE 13G/A |
| 2026-02-12 | Linden Advisors LP | 7.4% | SCHEDULE 13G/A |
| 2026-02-17 | Highbridge Capital Management, LLC | 7.6% | SCHEDULE 13G |
| 2026-02-17 | Lighthouse Investment Partners, LLC | 6.74% | SCHEDULE 13G |
| 2026-02-17 | Fort Baker Capital Management LP | 4.9% | SCHEDULE 13G/A |
| 2026-05-14 | Lighthouse Investment Partners, LLC | 0.3% | SCHEDULE 13G/A |
| 2026-05-14 | North Rock Capital Management, LLC | 6.21% | SCHEDULE 13G |
| 2026-06-05 | Verbena Value LP | 6.21% | SCHEDULE 13G |
| 2026-08-06 | W. R. Berkley Corporation | 5.6% | SCHEDULE 13G |
| 2026-08-13 | Glazer Capital, LLC | 5.08% | SCHEDULE 13G |
| 2026-09-30 | NCCS Management, LLC | 4.6% | SCHEDULE 13D |
| 2026-10-26 | Hennessy Thomas D | 6% | SCHEDULE 13G/A |
Questions about who owns ONE Nuclear Energy Inc.
Who owns ONE Nuclear Energy Inc.?
On this page, 8 holders' latest ownership filings report 5% or more of ONE Nuclear Energy Inc.: Highbridge Capital Management, LLC (7.6%, Schedule 13G, filed 2026-02-17), Linden Advisors LP (7.4%, Schedule 13G/A, filed 2026-02-12), North Rock Capital Management, LLC (6.21%, Schedule 13G, filed 2026-05-14), Verbena Value LP (6.21%, Schedule 13G, filed 2026-06-05) and Hennessy Thomas D (6%, Schedule 13G/A, filed 2026-10-26); 3 more are listed above.
Who are the largest shareholders of ONE Nuclear Energy Inc.?
By the share each holder's latest filing reports, the largest holders of ONE Nuclear Energy Inc. on this page are Highbridge Capital Management, LLC (7.6%), Linden Advisors LP (7.4%) and North Rock Capital Management, LLC (6.21%).
When did Highbridge Capital Management, LLC buy into ONE Nuclear Energy Inc.?
The filings give report dates, not purchase dates. The earliest filing from Highbridge Capital Management, LLC on this page is the Schedule 13G, filed 2026-02-17, reporting 7.6%.
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%); 19 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.
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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.