Valar Atomics raised $1 billion in Series B funding led by Sequoia Capital at a $6 billion valuation, TechCrunch reported. Apandion Capital, Atreides Management, Conviction, Dream Ventures, HOF Capital, Point72, Riot Ventures, Snowpoint Ventures and Valor Equity Partners also participated. Alongside the equity, the company announced a $200 million credit facility led by Erebor Bank, as administrative agent, and J.P. Morgan, with Crescent Cove and Hercules Capital participating. Sequoia partner Shaun Maguire is joining the board.
The valuation triples the $2 billion the company carried after a $450 million round in April 2026, according to Tech Funding News. Four months separate the two marks.
The demonstration that moved the price
Valar's Ward 250 unit reached self-sustaining criticality on June 18, 2026, at the San Rafael Energy Research Center in Orangeville, Utah, per Tech Times. It then generated electricity to power an Nvidia Blackwell system — which the company describes in its own funding announcement as "the first and only time that an advanced reactor has directly powered AI infrastructure." Ward 250 is a high-temperature gas reactor with a waterless design, which matters for siting: a reactor that does not need cooling water can go where water rights are unavailable.
In its first two years, by its own account, Valar completed its non-nuclear Ward Zero prototype, achieved cold criticality of its NOVA core at Los Alamos National Laboratory, and was selected for the U.S. Department of Energy's Nuclear Reactor Pilot Program and its Advanced Nuclear Fuel Line Pilot Program. "It took seven months to take Ward 250 critical," the company says in the same announcement. Valar has also signed a development agreement with Nvidia for a waterless 30-megawatt AI factory.
What the money is for
The company's stated plan is to stop building reactors and start manufacturing them — to "transition from demonstrating the operability of an integrated reactor system to producing fleets of them en masse," including its own fuel production facilities. As Tech Startups put it, the bet is on "building reactors more like manufactured products than multibillion-dollar construction projects."
Valar was founded in 2023 in California. Founder Isaiah Taylor dropped out of high school at 16, per Tech Funding News.
The regulatory gap
Valar does not hold a Nuclear Regulatory Commission commercial license, and Tech Times notes it needs one before it can operate commercially. The DOE pilot programs are the pathway that lets a reactor run and be tested without that license in hand; they are not a substitute for it.
Tech Times also cites a 2023 Monte Carlo study published in the journal Energy that found none of 19 surveyed small modular reactor designs were economically competitive without subsidy, and that high-temperature gas reactor designs specifically carried median levelized costs of electricity between $116 and $137 per megawatt-hour before any subsidy credit. Ward 250 is a high-temperature gas reactor.
AI operators have signed large power and compute agreements through 2026. Anthropic's $10 billion, six-year compute deal with Volta for a Norwegian data center runs on hydropower, and Nvidia is in talks to guarantee $250 billion for OpenAI's Ohio data center. Valar's stated target is a reactor small enough to be manufactured and sited next to a data center.
A day later, Hadrian raised a $1.37 billion Series D at a $7.87 billion valuation to build automated defense factories.
Two days before Valar's round, Base Power closed $1 billion at a $13 billion valuation for grid-connected home batteries.
Source: TechCrunch, with additional detail from Valar Atomics and Tech Times.
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