Castelion vs Astranis
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.
Astranis is building the world's smallest geostationary communication satellites, providing dedicated broadband connectivity to underserved countries and island regions. HQ: San Francisco.
About
Astranis is a satellite internet company building the world's smallest geostationary (GEO) communication satellites — roughly the size of a washing machine at ~400kg, compared to traditional telecom satellites weighing 6,000kg+. Founded in 2015 by John Gedmark and Ryan McLinko, Astranis has developed a miniaturized satellite platform that dramatically reduces the cost and lead time of deploying dedicated broadband capacity to underserved regions. Its satellites are designed to provide dedicated broadband capacity — not shared like LEO constellation services (Starlink) — to island nations, remote regions, and underserved countries that lack terrestrial broadband infrastructure.
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