Sequoia's Shaun Maguire Leads $1B Round for Nuclear Startup Valar Atomics at $6B Valuation

Valar Atomics raised $1 billion at a $6 billion valuation in a round led by Sequoia partner Shaun Maguire, TechCrunch reported on August 3. The nuclear startup had signed a development deal with Nvidia in June, and the new capital brings the company's total funding to more than $1.5 billion since founding.

The Deal

The $1 billion round is among the largest venture financings of the year for a nuclear startup. Sequoia led, with participation from existing investors including Andreessen Horowitz and a handful of strategic backers. The deal closed at a $6 billion post-money valuation, a step-up from Valar's previous round at $1.5 billion. The company plans to use the capital to build its first commercial reactor and to expand its engineering team.

"Valar Atomics raised $1 billion at a $6 billion valuation after signing a development deal with Nvidia in June," TechCrunch wrote.

Why Nvidia Cares

The Nvidia development deal, signed in June, gives the chipmaker early access to Valar's small modular reactor designs for powering AI data centers. Several hyperscalers have publicly committed to nuclear as part of their carbon-free energy roadmaps, and Nvidia's deal was the first to explicitly link a nuclear startup to AI compute. Other hyperscalers have since signed similar deals with rival nuclear startups.

Why Now

The round lands amid a broader nuclear renaissance. Base Power separately raised $1 billion for home batteries, and AI-related power demand has rekindled interest in advanced nuclear. The Nuclear Regulatory Commission has streamlined review for several reactor designs, and state-level legislation has begun easing site approvals. Valar is one of three or four startups with credible reactor designs at this point; the field is competitive but still small.