Deep Fission, Inc. (FISN) Ownership
FISN ownership summary
as of October 18, 2026- Institutions
- 12.8% of shares outstanding
- Insiders
- 37.66% of shares outstanding
- Shares outstanding
- 58.9M
- Float
- 30.1M shares available to trade
- Short interest
- 3.72% 1.6M shares short
- Days to cover
- 4.20 short interest up 27.5% vs prior month
- Institutions 12.84%
- Insiders 37.66%
- Other investors 49.50%
FISN top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Blue Owl Capital Holdings LP | 2.21% | 1.3M | $4.6M | +1.3M (0.0%) | June 30, 2026 |
| 2 | Elevation Wealth Management LLC | 0.49% | 298K | $1.0M | +298,335 (0.0%) | June 30, 2026 |
| 3 | UBS Group AG | 0.33% | 198K | $684,815 | +198,497 (0.0%) | June 30, 2026 |
| 4 | CONSOLIDATED PRESS INTERNATIONAL HOLDINGS LTD | 0.22% | 133K | $459,999 | +133,333 (0.0%) | June 30, 2026 |
| 5 | Citadel Advisors Llc | 0.18% | 110K | $379,500 | +110,000 (0.0%) | June 30, 2026 |
| 6 | LPL Financial Corp | 0.12% | 71K | $244,460 | +70,858 (0.0%) | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 0.05% | 27K | $94,299 | +27,333 (0.0%) | June 30, 2026 |
| 8 | Essential Investment Partners, LLC | 0.04% | 26K | $91,080 | +26,400 (0.0%) | June 30, 2026 |
| 9 | Chapin Davis Inc | 0.03% | 19K | $65,550 | +19,000 (0.0%) | June 30, 2026 |
| 10 | The Goldman Sachs Group Inc | 0.03% | 17K | $59,937 | +17,373 (0.0%) | June 30, 2026 |
| 11 | Bhk Investment Advisors, LLC | 0.02% | 15K | $51,750 | +15,000 (0.0%) | June 30, 2026 |
| 12 | Springbok Capital Management, LLC | 0.02% | 15K | $50,763 | +14,714 (0.0%) | June 30, 2026 |
| 13 | Traphagen Investment Advisors LLC | 0.02% | 14K | $47,148 | +13,666 (0.0%) | June 30, 2026 |
| 14 | Integrated Wealth Concepts LLC | 0.02% | 9,600 | $33,120 | +9,600 (0.0%) | June 30, 2026 |
| 15 | Morgan Stanley - Brokerage Accounts | 0.01% | 6,050 | $20,872 | +6,050 (0.0%) | June 30, 2026 |
| 16 | U.S. Bancorp | <0.01% | 1,100 | $3,795 | +1,100 (0.0%) | June 30, 2026 |
| 17 | Hartland & Co | <0.01% | 500 | $1,725 | +500 (0.0%) | June 30, 2026 |
| 18 | Wells Fargo & Co | <0.01% | 335 | $1,156 | +335 (0.0%) | June 30, 2026 |
| 19 | JONES FINANCIAL COMPANIES LLLP | <0.01% | 300 | $1,035 | +300 (0.0%) | June 30, 2026 |
| 20 | NATIONAL BANK OF CANADA /FI/ | <0.01% | 200 | $690 | +200 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 20 holders added 2.3M shares and 0 cut 0.
FISN top mutual fund and ETF holders
5 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Range Nuclear Renaissance ETF | 0.80% | 484K | $1.7M | — | September 30, 2026 |
| 2 | WisdomTree Uranium & Nucler Ey ETF $ Acc | 0.15% | 90K | $309,199 | −560 (−0.6%) | September 30, 2026 |
| 3 | Fidelity Nasdaq Composite Index | 0.03% | 18K | $63,276 | −17,244 (−48.5%) | August 31, 2026 |
| 4 | ALPS Nautilus SMR, Nuclear & Tech ETF | 0.01% | 6,060 | $20,907 | — | September 30, 2026 |
| 5 | Infras CptlNuclearRenaissanceUCITSUSDAcc | <0.01% | 2,041 | $7,041 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
Who owns FISN
Institutional investors own 12.8% of Deep Fission's shares and insiders 37.66%. The largest holder is Blue Owl Capital Holdings LP with 2.21% of the shares (1.3M), as of June 30, 2026. Among the top 20 institutions, 20 added shares and 0 reduced their stake in the latest filings. Short interest is 3.72% of the float, or 4.20 days of average trading volume.
Related: FISN analyst forecast, FISN key metrics. See the FISN stock overview for the latest quote and news.
FISN ownership FAQ
Who owns the most Deep Fission stock?
The largest shareholders of Deep Fission are Blue Owl Capital Holdings LP (2.21%), Elevation Wealth Management LLC (0.49%), UBS Group AG (0.33%), CONSOLIDATED PRESS INTERNATIONAL HOLDINGS LTD (0.22%), Citadel Advisors Llc (0.18%).
What percentage of Deep Fission is owned by institutions?
Institutions hold 12.8% of Deep Fission's shares outstanding; insiders hold 37.66%.
Which funds own Deep Fission?
The largest fund holders of Deep Fission are Range Nuclear Renaissance ETF (0.80%), WisdomTree Uranium & Nucler Ey ETF $ Acc (0.15%), Fidelity Nasdaq Composite Index (0.03%), ALPS Nautilus SMR, Nuclear & Tech ETF (0.01%), Infras CptlNuclearRenaissanceUCITSUSDAcc (<0.01%).
What is Deep Fission's short interest?
1.6M shares of Deep Fission were sold short, 3.72% of the float; at the average daily volume it would take 4.20 days to cover.
How many shares of Deep Fission are outstanding?
Deep Fission has 58.9M shares outstanding, of which 30.1M are in the public float.