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Atlas Atomics raises $400M in Series A led by General Catalyst at $1.9B valuation. The nuclear startup is developing heavy water reactor technology for reliable power generation.

PRIVATEOct 09, 2026

Amount Raised

$400 Million

Round Type

Series A

Biotechnology

Investors

Andreessen HorowitzGeneral Catalyst

Description

Atlas Atomics, a nuclear startup cofounded by Vivek Ramaswamy, has raised $400 million in Series A funding at a $1.9 billion valuation. General Catalyst is leading the round with participation from Andreessen Horowitz. The company is developing improved heavy water reactor technology that doesn't rely on enriched uranium. Atlas Atomics aims to deliver reliable power, increase medical and industrial isotope production, and support nuclear fuel recycling.

Company Information

Company

Atlas Atomics

About

Atlas Atomics is a nuclear startup developing improved heavy water reactor technology that doesn't rely on enriched uranium. The company aims to deliver reliable power, increase production of medical and industrial isotopes, and support nuclear fuel recycling. Still in stealth mode, it is cofounded by Kevin Gan, an energy investment veteran, and led by Balendra Sutharshan, former COO of Oak Ridge National Laboratory.

Fundz sees it the moment Atlas Atomics raises, hires an exec or expands, usually minutes after it happens, and tells you who to reach.

Predictive Intelligence
Strategic

ML-powered predictions for Atlas Atomics's next move

See what Strategic adds

Funding Insights

What this usually means
Typical timeline to Series B
Series A companies typically raise their next round in 10-18 months

Atlas Atomics raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

145 of these a day, filtered to the companies you pick, with the decision-maker attached.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.