FISNNasdaqElectric ServicesFiscal year ends December 31
DEEP FISSION, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 3, 2026
$3.66+0.21 (+6.09%)
Close on Oct 19, 2026
- Market cap
- $201.66M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
3.9%
2M of 59M shares
Institutional holders
22
22 new, 0 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Muller Richard | 5,426,406 | 10.60% | 13D (active) | Sep 5, 2025 |
| Mark N.Tompkins | 3,158,333 | 5.60% | 13G (passive) amendment | Mar 31, 2026 |
| Mark N. Tompkins | 2,958,333 | 5.82% | 13G (passive) amendment | Sep 30, 2025 |
| Ee Holdings Limited | 2,866,667 | 5.50% | 13G (passive) | Sep 30, 2025 |
| Muller Elizabeth | 10,541,757 | 20.60% | 13D (active) | Sep 5, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of FISN | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Blue Owl Capital Holdings LP | 1,333,333 | 2.26% | $14.72M | New | 2.22% |
| Elevation Wealth Management LLC | 298,335 | 0.51% | $3.29M | New | 2.46% |
| UBS Group AG | 198,497 | 0.34% | $2.19M | New | 0.00% |
| Consolidated Press International Holdings Ltd | 133,333 | 0.23% | $1.47M | New | 56.42% |
| Citadel Advisors LLC | 110,000 | 0.19% | $1.21M | New | 0.00% |
| LPL Financial LLC | 70,858 | 0.12% | $782.27K | New | 0.00% |
| Geode Capital Management, LLC | 27,333 | 0.05% | $301.76K | New | 0.00% |
| Essential Investment Partners LLC | 26,400 | 0.04% | $291.46K | New | 0.23% |
| Chapin Davis, Inc. | 19,000 | 0.03% | $209.76K | New | 0.04% |
| Goldman Sachs Group Inc | 17,373 | 0.03% | $191.80K | New | 0.00% |
| BHK Investment Advisors, LLC | 15,000 | 0.03% | $165.60K | New | 0.05% |
| Prelude Capital Management, LLC | 14,714 | 0.02% | $162.44K | New | 0.01% |
| Traphagen Investment Advisors LLC | 13,666 | 0.02% | $150.87K | New | 0.01% |
| Integrated Wealth Concepts LLC | 9,600 | 0.02% | $105.98K | New | 0.00% |
| Morgan Stanley | 6,050 | 0.01% | $66.79K | New | 0.00% |
| US Bancorp \de\ | 1,100 | 0.00% | $12.14K | New | 0.00% |
| Clearstead Advisors, LLC | 500 | 0.00% | $5.52K | New | 0.00% |
| FNY Investment Advisers, LLC | 500 | 0.00% | $5 | New | 0.00% |
| Wells Fargo & Company/Mn | 335 | 0.00% | $3.70K | New | 0.00% |
| Jones Financial Companies Lllp | 300 | 0.00% | $3.23K | New | 0.00% |
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 | 22 | 2M | 3.9% | 22 / 0 | 0 / 0 | 2M | 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 |
|---|---|---|---|---|
| Ian Seth Jacobs | President, CEO, CFO, Secretary, Director | 275,000 | 0.47% | Aug 28, 2025 |
| Richard Muller | Chief Technology Officer | 5,196,426 | 8.82% | Mar 10, 2026 |
| Jonathan H. Gordon | General Counsel | – | – | Mar 10, 2026 |
| Elizabeth Muller | Chief Executive Officer | 5,607,306 | 9.52% | Mar 10, 2026 |
| William Mark Schmitz | Chief Financial Officer | 103,928 | 0.18% | Mar 10, 2026 |
| Mark Wayne Peres | Chief Nuclear Officer | 86,607 | 0.15% | Mar 10, 2026 |
| Michael Allen Brasel | Chief Operating Officer | – | – | Mar 10, 2026 |
| Thomas S. Glanville | Director | – | – | Jul 27, 2026 |
| Jonathon Angell | Director | 324,517 | 0.55% | Jul 27, 2026 |
| Tepper Leslie Goldman | Director | 133,996 | 0.23% | Jul 27, 2026 |
| Blake Janover | Director | – | – | Jul 27, 2026 |
| Mark N. Tompkins | – | 1,891,667 | 3.21% | Sep 8, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Elizabeth Muller Chief Executive Officer | Dec 9, 2025 | Award | +549,451 | – | – | 549,451 |
| Elizabeth Muller President and Chief Executive, Director | Sep 5, 2025 | Award | +5,057,855 | – | – | 5,057,855 |
| Elizabeth Muller President and Chief Executive, Director | Sep 5, 2025 | Award | +5,196,426 | – | – | 5,196,426 |
| Richard Muller Chief Technology Officer, Director | Sep 5, 2025 | Award | +5,196,426 | – | – | 5,196,426 |
| William Mark Schmitz Chief Financial Officer | Sep 5, 2025 | Award | +103,928 | – | – | 103,928 |
| Mark N. Tompkins – | Sep 5, 2025 | Other | −2,833,333 | – | – | 1,891,667 |
| Ian Seth Jacobs President, CEO, CFO, Secretary, Director | Aug 26, 2025 | Buy | +25,000 | – | – | 275,000 |
| Mark N. Tompkins Director, 10% owner | Aug 26, 2025 | Sale | −25,000 | – | – | 4,725,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.