ONE Nuclear Energy Inc. (ONEN) shareholders
ONENNasdaqElectric ServicesFiscal year ends December 31
$1.51+0.10 (+7.08%)
Close on Nov 12, 2026Market cap $39.30MP/E –Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
72.5%
19M of 26M shares
Institutional holders
55
7 new, 5 sold out
Net institutional buying
0M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Hennessy Thomas D Joint filing with HC VII Sponsor LLC (5.30%), Hennessy Capital Group LLC (5.30%) and 1 more | 6,494,999 | 6.00% | 13G (passive) amendment | Sep 30, 2026 |
| K2 & Associates Investment Management Inc. Joint filing with Shawn Kimel Investments, Inc. (9.71%), The K2 Principal Fund, L.P. (9.71%) and 1 more | 1,700,000 | 9.71% | 13G (passive) | Jan 17, 2025 |
| Robin Shah Joint filing with Tenor Capital Management Company, L.P. (8.60%), Tenor Opportunity Master Fund, Ltd. (8.60%) | 1,500,000 | 8.60% | 13G (passive) | Jan 17, 2025 |
| Highbridge Capital Management, LLC | 1,500,000 | 7.60% | 13G (passive) | Dec 31, 2025 |
| Siu Min Wong Joint filing with Linden Advisors LP (7.40%), Linden Capital L.P. (7.10%) and 1 more | 1,463,732 | 7.40% | 13G (passive) amendment | Dec 31, 2025 |
| AQR Arbitrage, LLC Joint filing with AQR Capital Management, LLC (6.54%), AQR Capital Management Holdings, LLC (6.54%) | 1,288,444 | 6.54% | 13G (passive) | Mar 31, 2025 |
| NR1 SP, a segregated portfolio of North Rock SPC Joint filing with Lighthouse Investment Partners, LLC (6.74%), MAP 204 Segregated Portfolio, a segregated portfolio of LMA SPC (6.74%) and 4 more | 1,280,840 | 6.74% | 13G (passive) | Dec 31, 2025 |
| North Rock Capital Management, LLC Joint filing with Lighthouse Investment Partners, LLC (6.21%) | 1,222,740 | 6.21% | 13G (passive) | Mar 31, 2026 |
| Verbena Value LP Joint filing with Aaron Diamond (6.21%) | 1,222,740 | 6.21% | 13G (passive) | Dec 31, 2025 |
| Berkley Insurance Company Joint filing with W. R. Berkley Corporation (5.60%) | 1,101,473 | 5.60% | 13G (passive) | Jun 30, 2026 |
| AQR Capital Management Holdings, LLC Joint filing with AQR Capital Management, LLC (5.38%), AQR Arbitrage, LLC (5.38%) | 1,059,589 | 5.38% | 13G (passive) amendment | Dec 31, 2025 |
| Fort Baker Capital Management LP Joint filing with Steven Patrick Pigott (5.10%), Fort Baker Capital, LLC (5.10%) | 1,008,922 | 5.10% | 13G (passive) | Sep 30, 2025 |
| Glazer Capital, LLC Joint filing with Paul J. Glazer (5.08%) | 999,993 | 5.08% | 13G (passive) | Jun 30, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ONEN | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Highbridge Capital Management LLC | 1,690,479 | 6.50% | $17.63M | +28,644 | 0.43% |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 1,500,000 | 5.76% | $15.68M | – | 0.22% |
| Linden Advisors LP | 1,463,732 | 5.62% | $15.30M | – | 0.08% |
| Verbena Value LP | 1,222,740 | 4.70% | $12.78M | – | 2.11% |
| Berkley W R Corp | 1,101,473 | 4.23% | $11.51M | +372,814 | 0.53% |
| AQR Arbitrage LLC | 1,011,784 | 3.89% | $10.57M | −41,685 | 0.15% |
| Glazer Capital, LLC | 999,993 | 3.84% | $10.45M | +300,084 | 0.26% |
| D. E. Shaw & Co., Inc. | 940,500 | 3.61% | $9.83M | – | 0.00% |
| Crossingbridge Advisors, LLC | 940,222 | 3.61% | $9.83M | – | 1.73% |
| Mizuho Securities USA LLC | 685,345 | 2.63% | $7.07M | +421,750 | 0.07% |
| Magnetar Financial LLC | 665,000 | 2.56% | $6.95M | – | 0.06% |
| Radcliffe Capital Management, L.P. | 525,544 | 2.02% | $5.49M | – | 0.42% |
| RiverPark Advisors, LLC | 475,322 | 1.83% | $4.97M | – | 2.27% |
| Rivernorth Capital Management, LLC | 398,656 | 1.53% | $4.20M | −368 | 0.20% |
| Goldman Sachs Group Inc | 369,995 | 1.42% | $3.87M | – | 0.00% |
| Wealthspring Capital LLC | 353,542 | 1.36% | $3.69M | +186,885 | 0.83% |
| LMR Partners LLP | 350,000 | 1.34% | $3.66M | – | 0.01% |
| Sculptor Capital LP | 347,606 | 1.34% | $3.63M | – | 0.03% |
| Moore Capital Management, LP | 300,000 | 1.15% | $3.14M | – | 0.05% |
| Meteora Capital, LLC | 300,000 | 1.15% | $3.14M | – | 0.26% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 55 | 19M | 72.5% | 7 / 10 | 8 / 5 | 2M | 2M |
| Q1 2026 | 53 | 19M | 71.6% | 6 / 11 | 10 / 8 | 3M | 3M |
| Q4 2025 | 55 | 18M | 69.6% | 22 / 4 | 17 / 9 | 6M | 6M |
| Q3 2025 | 42 | 18M | 68.9% | 3 / 5 | 13 / 6 | 1M | 1M |
| Q2 2025 | 46 | 18M | 68.4% | 21 / 4 | 8 / 2 | 8M | 3M |
| Q1 2025 | 28 | 13M | 51.6% | 28 / 0 | 0 / 0 | 13M | 0M |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Robert Carilli | Chief Strategy Officer, Director, 10% owner | 30,237,851 | 116.20% | Sep 25, 2026 |
| Richard David Taylor | Chief Executive Officer, Director, 10% owner | 30,237,851 | 116.20% | Sep 25, 2026 |
| Kevin Francis Dowd | Chief Operating Officer, Director, 10% owner | 30,237,852 | 116.20% | Sep 25, 2026 |
| Ann T. Anthony | Chief Financial Officer | – | – | Sep 25, 2026 |
| Darryl Keith Willis | Director | – | – | Oct 2, 2026 |
| Elizabeth Suzanne Williams | Director | – | – | Sep 25, 2026 |
| Kyle Bradford Crowley | Director | – | – | Sep 25, 2026 |
| Daniel J. Hennessy | Director | 5,703,333 | 21.92% | Sep 23, 2026 |
| NCCS Management, LLC | 10% owner | – | – | Oct 5, 2026 |
| New Circle Capital Solutions, LP | 10% owner | 4,987,103 | 19.16% | Oct 5, 2026 |
| Brian Bonner | – | 25,000 | 0.10% | Sep 23, 2026 |
| Capital Group LLC Hennessy | – | 5,703,333 | 21.92% | Sep 23, 2026 |
| VII Sponsor LLC HC | – | – | – | Sep 23, 2026 |
| Anna S. Brunelle | – | 25,000 | 0.10% | Sep 23, 2026 |
| Grant R. Allen | – | 25,000 | 0.10% | Sep 23, 2026 |
| Thomas D. Hennessy | – | 12,198,332 | 46.87% | Sep 23, 2026 |
| Poonam Sharma Mathis | – | 30,000 | 0.12% | Sep 23, 2026 |
| Javier Saade | – | 25,000 | 0.10% | Sep 23, 2026 |
| Nicholas Boris Geeza | – | 250,000 | 0.96% | Sep 23, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Thomas D. Hennessy – | Sep 23, 2026 | Option exercise | +750,000 | – | – | 750,000 |
| Thomas D. Hennessy – | Sep 23, 2026 | Option exercise | +41,666 | – | – | 5,744,999 |
| Thomas D. Hennessy – | Sep 23, 2026 | Option exercise | +5,203,333 | – | – | 5,703,333 |
| Grant R. Allen – | Sep 23, 2026 | Option exercise | +25,000 | – | – | 25,000 |
| Anna S. Brunelle – | Sep 23, 2026 | Option exercise | +25,000 | – | – | 25,000 |
| Capital Group LLC Hennessy – | Sep 23, 2026 | Option exercise | +5,203,333 | – | – | 5,703,333 |
| Capital Group LLC Hennessy – | Sep 23, 2026 | Option exercise | +41,666 | – | – | 5,744,999 |
| Daniel J. Hennessy Director | Sep 23, 2026 | Option exercise | +5,203,333 | – | – | 5,703,333 |
| Daniel J. Hennessy Director | Sep 23, 2026 | Option exercise | +41,666 | – | – | 5,744,999 |
| Nicholas Boris Geeza – | Sep 23, 2026 | Option exercise | +250,000 | – | – | 250,000 |
| Brian Bonner – | Sep 23, 2026 | Option exercise | +25,000 | – | – | 25,000 |
| Poonam Sharma Mathis – | Sep 23, 2026 | Option exercise | +30,000 | – | – | 30,000 |
| Javier Saade – | Sep 23, 2026 | Option exercise | +25,000 | – | – | 25,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of shares outstanding
0.13%
0M shares short
Days to cover
1.0
At 0M shares a day
Change since last report
-41.0%
From 0M shares
Short volume, 20 days
40.0%
Of volume reported to FINRA
Shares sold short, last 2 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of ONE Nuclear Energy's stock actually held short. Settlement fails (shares not delivered on time) peaked at 4,741,706 shares on Sep 24, 2026 over the last 90 days.
See a number that looks wrong?