Deep Fission
FISN · NASDAQ
$2.81−$0.85 (−23.22%)TodayMarket closed ·
Prev close $3.66
Who owns FISN
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 47.5% of FISN’s shares.
- Muller (Elizabeth)17.0%
- Muller (Richard A. Ph.D.)8.6%
- 8VC GP I, LLC7.7%
- Tompkins (Mark N)5.2%
- Next 6 largest institutions8.9%
- All other shareholders52.5%
| Holder | Shares | % of shares |
|---|---|---|
| Muller (Elizabeth) | 10.25M | 17.00% |
| Muller (Richard A. Ph.D.) | 5.20M | 8.61% |
| 8VC GP I, LLC | 4.67M | 7.74% |
| Tompkins (Mark N) | 3.16M | 5.24% |
| EE Holdings Ltd | 3.07M | 5.08% |
| Blue Owl Capital Holdings LP | 1.33M | 2.21% |
| Angell (Jonathon) | 324.52K | 0.54% |
| Elevation Wealth Management LLC | 298.33K | 0.49% |
| UBS Financial Services, Inc. | 198.50K | 0.33% |
| Goldman (Tepper Leslie) | 134.00K | 0.22% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity NASDAQ Composite Index Fund | 35.59K | 0.06% |
| ALPS Nautilus SMR Nuclear & Technology ETF | 6.06K | 0.01% |
Insider trades
Form 4 filings by officers, directors and large holders
Insiders made no open-market buys or sales of FISN in the last 6 months.
| Insider | Type | Shares | Value |
|---|---|---|---|
| JANOVER BLAKE | Award | 18.96K | — |
| Goldman Tepper Leslie | Award | 19.20K | — |
| Angell Jonathon | Award | 16.97K | — |
| GLANVILLE THOMAS S | Award | 19.16K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 1.59M
- Days to cover
- 3.09
- % of shares outstanding
- 2.64%
- Average daily volume
- 514.57K
- Change since last report
- +27.5%
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