Castelion vs Hermeus
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $350M Series B (Dec 2025). $50M US Navy contract for Blackbeard hypersonic prototyping. 1,000-acre solid rocket motor facility under construction.
About
Castelion is a defense startup developing the Blackbeard hypersonic missile system, one of the few startups with an active US Navy contract for hypersonic weapons full-scale prototyping and early operational fielding. The company raised $350 million in Series B financing in December 2025 and secured a $50 million US Navy contract for Blackbeard prototyping, directly addressing the DoD's urgency to field hypersonic strike capability as China and Russia have demonstrated operational hypersonic weapons.
Defense tech company building fastest unmanned hypersonic aircraft for US warfighter; raised $350M at $1B valuation in Apr 2026 led by Khosla Ventures; $500M+ total funding;
About
Hermeus is a Los Angeles-based defense tech company building autonomous hypersonic aircraft capable of flying five times the speed of sound. The company reached unicorn status in April 2026 after closing a $350 million round ($200M equity, $150M debt) led by Khosla Ventures, with participation from Founders Fund, In-Q-Tel, RTX Ventures, Cox Enterprises, and Destiny Tech100.
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