Hypersonic missile startup Castelion raised a $1 billion Series C round co-led by Andreessen Horowitz, Carlyle, and JPMorgan Chase, valuing the company at $13 billion. The company, founded by former SpaceX executives, has already secured more than $500 million in US military contracts, with the Navy emerging as its primary customer.
The Pentagon signed a framework agreement with Castelion in May contemplating a two-year production contract for its Blackbeard hypersonic missile, with a minimum production rate of 500 missiles annually pending successful testing and validation.
The Pitch: Cheap, Mass-Produced Hypersonics
Castelion’s Blackbeard missile is expected to cost roughly $384,000 per unit, a fraction of the millions to tens of millions of dollars some existing US hypersonic weapons systems cost. That price gap is the core of Castelion’s pitch to the Pentagon: rather than building a small number of exquisite, expensive hypersonic weapons, the company argues the US needs a much larger, cheaper stockpile it can actually afford to produce and use at scale.
Why This Matters Beyond One Contract
A defense startup founded by SpaceX alumni reaching a $13 billion valuation on the strength of a low-cost, mass-producible weapons approach reflects a broader shift in how the Pentagon is trying to source next-generation weapons, leaning on venture-backed startups that can iterate faster than traditional defense contractors, rather than relying exclusively on established primes like Lockheed Martin or Raytheon. Whether Castelion’s manufacturing approach can actually hit its cost and volume targets at real production scale, rather than in early testing, is what the next two years of the Navy contract will determine.
