Weapons Startup Castelion Strikes $100M Series A

January 29, 2025

Illustration of people building a rocket ship.

Chris Metinko

, a defense manufacturer developing long-range hypersonic strike weapons, raised a $100 million Series A in a mix of debt and equity.

The El Segundo, California-based startup creates what it calls 鈥渁ffordable, mass-produced hypersonic long-range strike weapons鈥� that serve as a 鈥渘on-nuclear deterrent.鈥�

The Series A 鈥� which includes $30 million in venture debt from 鈥� was led by with participation from , , , , and .

The deal is just the latest in the defense tech sector for a16z. Last year, the firm led a $175 million Series B for autonomous surface vessels maker at a $1 billion valuation. The company also is an investor in defense tech giant .

Big money for defense

Defense tech has garnered major headlines in the past several months after massive raises by the likes of Anduril and artificial intelligence defense software developer .

Just late last year, defense and critical infrastructure tech startup raised $145 million in a Series B.

Already this year, raised a $60 million Series C and locked up a $50 million Series B.

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