Castelion hits $13B valuation to mass-produce hypersonic missiles

Founded in 2022, Castelion set out to manufacture hypersonic weapon systems at lower cost and faster speeds than traditional defense primes, and has since secured more than $500 million in U.S. military contracts. The funding lands as the Pentagon looks to procure more hypersonic weapons — missiles capable of traveling above Mach 5 — because the U.S. stockpile hasn’t kept pace with China’s. Castelion is betting its faster manufacturing process can help close that gap, positioning speed of production, not just the underlying missile technology, as its edge over incumbent defense contractors.

The Torrance, California-based startup will use the new capital to produce its Blackbeard missiles, named after the English pirate, along with other hypersonic weapons, at its production facility in New Mexico. The round included participation from existing backers Lightspeed, General Catalyst, and Altimeter alongside new lead investors Andreessen Horowitz, Carlyle, and JPMorgan Chase, and comprised $800 million in equity plus a $250 million revolving credit facility — a capital structure that combines venture equity with debt financing, a structure increasingly common among capital-intensive defense-hardware startups that need to fund factories as well as R&D.

The $13 billion valuation places Castelion among the higher-valued venture-backed defense manufacturers, reflecting how quickly investor interest in hypersonics and other defense-hardware categories has scaled alongside renewed government urgency around the missile-stockpile gap with China.

Why it matters

A $13 billion valuation for a three-year-old missile startup shows how much capital investors are willing to commit to defense-tech companies promising to out-manufacture the traditional primes on hypersonic weapons — a category the Pentagon has flagged as a strategic gap.