CesiumAstro Series D · $730M raised · (2026)

Austin-based space communications startup CesiumAstro has closed a $730 million Series D round at a valuation exceeding $4.5 billion, bringing its total capital raised in 2026 to over $1.2 billion. The follow-on investment marks a strategic shift for the company to develop and operate its own satellite infrastructure. CesiumAstro will use the funds to launch Synchronicity, a planned 737-satellite, AI-enabled constellation (specific investors were not disclosed in the announcement).