Castelion raises $100M to build hypersonic missiles, with SpaceX veterans at the helm

Summary

Castelion, a hypersonic missile startup founded by SpaceX veterans, raised $100 million in a Series A led by Lightspeed Venture Partners, bringing total funding to $114 million. The round included $70 million in equity and $30 million in debt, with co-investors Andreessen Horowitz and Blue Yard Capital also participating. The startup now operates with 60 employees, roughly half of whom came from SpaceX, and all three founders held senior positions there.

Castelion builds complete hypersonic weapon systems for the US military rather than single components. Hypersonic weapons travel at least Mach 5 and can maneuver mid-flight—a critical advantage over traditional ICBMs, which follow predictable parabolic arcs that existing missile defense systems are designed to counter. Hypersonics can fly low, evade radar, and strike targets like aircraft carriers with minimal warning time.

The Pentagon has spent over $1 billion on hypersonics development over more than a decade without fielding a battlefield-ready system. Castelion says its strategy of frequent flight tests, rapid engineering iteration, and economical manufacturing will produce cheaper and better alternatives. The company conducts three test flights per month in the California desert and has already secured more than $22 million in federal contracts, mostly from the Air Force. It plans its first hypersonic speed test flight this summer and says it will have a finished product ready for the military by 2027.

Founder Sean Pitt noted that the Trump administration's willingness to award contracts to non-traditional defense players creates an opening for startups. The company's public demo strategy—inviting investors to watch live desert tests—has become a signature tactic. The firm converted a large vehicle into a mobile launcher system and drove it from El Segundo, where it is headquartered, to test sites, effectively turning investor meetings into capability demonstrations.

The $22 million in government contract revenue already flowing to the company is material. At equivalent revenue levels, a Series B SaaS company might raise $100 million at a $500 million valuation. Defense contracts also create recurring revenue through maintenance services—sometimes structured at several hundred thousand dollars annually per unit for 10 years, providing predictable cash flow once a contract is won. The military procurement process remains a bottleneck even for better, cheaper products, but Castelion's early government traction and SpaceX pedigree have given it an advantage over earlier-stage competitors.

Blue Yard Capital, the Berlin-based investor in the round, has been performing exceptionally. Its 2016 fund achieved a 53% net IRR with a 4.8x net multiple and 3.4x DPI—returns that funded four subsequent funds. Blue Yard's first crypto fund, started in 2021 with $75 million, has achieved a 28% gross IRR and 1.7x gross multiple to date, outperforming average venture fund returns despite the narrative that crypto exposure destroys value.