DEEP FISSION, INC. (FISN)
About DEEP FISSION, INC.
Deep Fission Inc is a nuclear energy technology company developing a small modular reactor based on established pressurized water reactor technology, with novel emplacement in deep boreholes approximately one mile below the Earth's surface. Its reactor, which is referred to as the Gravity Reactor, will leverage subsurface conditions to support key containment and operating functions, including the use of hydrostatic pressure from a water column within the borehole to support reactor operating pressure and cooling, and the surrounding geological formation to provide structural confinement and shielding. The group's focus is within the United States, where electricity demand growth, expanding digital infrastructure, and evolving energy policy.
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Financial summary
- Net income
- -$61.0M
- Total assets
- $24.7M
- Market cap
- $619.0M
Source: SEC EDGAR · updated Jun 8, 2026
15-minute delayed · data by Polygon.io
Past year · hover for prices
52-week range
- Market cap
- $619.0M
- Shares outstanding
- 74.2M
- Open
- —
- Day range
- –
- Prev close
- —
- Volume
- —
- IPO date
- Jun 18, 2026
Deep Fission, Inc. (FISN) Stock Price
- Reported a net loss of $61.0M.
- Trading 43% below its 52-week high.
Automatically generated from public filings and market data. Informational only — not investment advice or a recommendation to buy or sell any security.
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Deep Fission, Inc.: frequently asked questions
Is Deep Fission, Inc. an American company?
Deep Fission, Inc. is a US-based company headquartered in Berkeley, California, listed in the americancompanies.com directory of American companies. Its American-origin credentials have not yet been independently verified.
Where is Deep Fission, Inc. headquartered?
Deep Fission, Inc. is headquartered in Berkeley, California, United States.
Is Deep Fission, Inc. publicly traded?
Yes — Deep Fission, Inc. is a publicly traded company. Its stock trades under the ticker symbol FISN.
What does Deep Fission, Inc. do?
Deep Fission, Inc. is an American Utilities company in the Energy & Utilities sector.
