Analysis
Valar Atomics, a nuclear-reactor startup building compact power plants for AI data centers, has sued one of its earliest investors, Day One Ventures, in Delaware court over how it allocated the startup's roughly $1 billion Series B, as reported by The Information.
The Dispute, As Reported
Day One put $1 million into Valar's seed round and $15 million into its Series A, giving it under 5% fully diluted ownership but "Major Investor" status and the pro-rata rights that come with it, according to reporting on the filing. When Sequoia pre-empted the Series B, Valar wanted one large existing backer to reinvest strategically rather than split the round among every rights-holder, and asked its other Major Investors to hold their allocations at zero so as not to trigger a "spring-back" clause that would restore everyone's pro-rata rights. Every investor agreed except Day One. The day before closing, Major Investors holding a majority of Valar's stock voted to amend the Investor Rights Agreement and remove the spring-back provision entirely -- the move Day One is now challenging in court.
“The company has separately been reported to be in talks around a $6 billion valuation following a reactor power milestone, a sharp markup from its Series A.”
Valar, founded by CEO Isaiah Taylor, is part of a wave of nuclear and advanced-reactor startups -- alongside Oklo, Kairos Power and X-energy -- racing to build small modular reactors that power AI data centers directly, bypassing grid interconnection queues that can take years. The company has separately been reported to be in talks around a $6 billion valuation following a reactor power milestone, a sharp markup from its Series A.
Why a Small Stake Fight Matters
Day One's stake is small, but the mechanism at issue -- spring-back pro-rata rights -- is standard across venture term sheets precisely because it protects smaller early backers when a round gets dominated by one large new or returning investor. If a court lets majority shareholders strip those rights the day before closing, later-stage pro-rata protections become easier for founders and lead investors to override across the industry, not just at Valar.
Day One has not sought an injunction to block the Series B from closing, and whether other early backers who agreed to hold their allocations at zero now face pressure to join its suit is the next thing to watch. Pulse has covered Valar's path from seed to its physical-AI infrastructure buildout through several prior financings.