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§ Private Profile · Berkeley, CA, USA
Advanced nuclear energy developer creating deep borehole SMRs for data centers, industrial use, and remote power.
Based in Berkeley, California, Deep Fission develops underground nuclear energy systems that place small modular reactors (SMRs) approximately one mile below the Earth's surface. The company utilizes traditional pressurized water reactor designs within deep boreholes, leveraging natural subterranean conditions to eliminate the need for large surface-level pressure vessels and containment structures. Deep Fission emerged from stealth mode in August 2024 with a $4 million pre-seed round led by venture capital firm 8VC, followed by an additional $30 million in financing in September 2025. The firm has secured a voucher from the Department of Energy to collaborate with Idaho National Labs on thermal hydraulics and established a commercial partnership with Endeavour to provide power for sustainable data centers. Deep Fission was founded in 2023 by the founding father-daughter team of Elizabeth Muller and Richard Muller.
Deep Fission has raised $114.0M across 3 funding rounds.
Deep Fission completed a reverse merger on September 5, 2025, which led to it becoming a public reporting company.
Yes, Deep Fission has signed Letters of Intent with partners across multiple power sites to advance its energy solutions.
Deep Fission completed a reverse merger on September 5, 2025, which led to it becoming a public reporting company.
Yes, Deep Fission has signed Letters of Intent with partners across multiple power sites to advance its energy solutions.
Deep Fission has raised $114.0M across 3 funding rounds. Most recently, it raised $80.0M Undisclosed in February 2026.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Feb 10, 2026 | $80M Undisclosed | — | Blue OWL, ED Eisler, Mark Tompkins, OWL Rock | Announced |
| Sep 8, 2025 | $30M Venture Round | — | ED Eisler, Mark Tompkins, 8VC, Deep Future, Wavefx | Announced |
| Aug 22, 2024 | $4M Pre Seed | JOE Lonsdale | David Marquardt | Announced |