Deep Fission, Inc. (FISN) stock
Close on Nov 12, 2026Market cap $122.52MP/E –Yield –
Key statistics
Valuation at the latest close; fundamentals over fiscal , balances at Sep 30, 2026
Valuation
- Market cap
- $122.52M
- P/E ratio
- –
- Price to sales
- –
- Price to book
- 1.46
- Dividend yield
- –
- Free cash flow yield
- -55.51%
Fundamentals
- Net income
- -$81.93M
- EPS, diluted
- -$1.49
- Free cash flow
- -$68.01M
- Book value per share
- $1.44
- Diluted shares
- 58M
Trading
- Previous close
- $2.07
- Open
- $2.00
- Day's range
- $1.91 – $2.15
- Volume
- 508,482
- Average volume (20 days)
- 1,053,606
- RSI (14 days)
- 38.3
- Relative volume
- 1.12×
Total return vs. the S&P 500
Price change plus reinvested dividends, to the close on Nov 12, 2026. The S&P 500 is measured by the SPY fund.
| Period | FISN | S&P 500 | Difference | FISN per year | S&P 500 per year |
|---|---|---|---|---|---|
| 1 month | -50.2% | -2.7% | −47.5 pts | ||
| 3 months | -75.1% | -1.7% | −73.3 pts | ||
| Year to date | -81.1% | +11.9% | −93.0 pts | ||
| 1 year | -81.1% | +12.0% | −93.1 pts | ||
| 3 years | -81.1% | +78.2% | −159.3 pts | -42.6% | +21.2% |
| 5 years | -81.1% | +73.2% | −154.4 pts | -28.4% | +11.6% |
| 10 years | -81.1% | +309.6% | −390.8 pts | -15.4% | +15.1% |
Five years at a glance
Fiscal years 2021 to 2025 and trailing twelve months, USD
Operating income
Net income
EPS, diluted
Free cash flow
Press releases
Releases Deep Fission filed with the SEC as exhibits to Form 8-K or 6-K
- Update
- Update
- Update
- Update
- Update
- Update
About Deep Fission
Electric Services
Deep Fission is a nuclear energy technology company that develops small modular reactors known as Gravity Reactors. The system integrates established pressurized water reactor technology into deep boreholes roughly one mile underground, relying on hydrostatic pressure from water columns for cooling and operational pressure. The company plans to deploy standalone units or borehole clusters producing electrical power for high-demand users, with a primary commercial focus on hyperscale data centers, as well as utilities, industrial operators, and defense facilities. Its planned business model spans project equity participation from electricity sales, deployment services, technology licensing, and maintenance operations.
Company profile, executives and historyDeep Fission stock: common questions
What is Deep Fission's stock price?
FISN closed at $2.08 on Nov 12, 2026, up 0.48% on the day.
What is Deep Fission's market cap?
Deep Fission was worth $122.52M at the close on Nov 12, 2026: the share price times the diluted shares outstanding.
What is FISN's P/E ratio?
Deep Fission lost money over the twelve months to Sep 30, 2026 (diluted EPS -$1.49), so it has no meaningful P/E ratio.
Does Deep Fission pay a dividend?
No. Deep Fission has not paid a cash dividend over the last twelve months.
How has FISN stock performed over the past year?
Including dividends, FISN returned -81.1% over the past year, against +12.0% for the S&P 500.
How many FISN shares are sold short?
2M shares were sold short at the latest FINRA report, 5.83% of the float, or 3.3 days of average trading volume.
Who are Deep Fission's competitors?
Companies most similar to Deep Fission by business, industry and size include OKLO, NNE, GFUZ, ORA, WAVE.
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