Castelion vs Apex Space
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.
Apex Space raised $400M across Series C and D rounds in 2025, achieving a $1B+ valuation, as the first manufacturer to offer productized 100–500kg satellite buses at high production rates for commercial and government LEO constellation customers.
About
Apex Space is a spacecraft manufacturer founded in 2022 that produces productized, configurable satellite bus platforms ranging from 100 to 500 kilograms, designed for rapid delivery and scalability to serve the growing demand for commercial and government space missions. Unlike traditional satellite manufacturers that build fully custom spacecraft for each customer, Apex offers standardized bus platforms that dramatically reduce lead times and per-unit costs, enabling customers to deploy constellations at production scale.
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