CesiumAstro Inc., an Austin, Texas-based company that builds space and defense communications systems and satellites, has closed a $730 million Series D round. Janus Henderson led the financing, which values CesiumAstro at more than $4.5 billion, the company announced Thursday in a Business Wire release.
The round brings CesiumAstro's total capital announced in 2026 to more than $1.2 billion, according to the release. The $1.2 billion figure includes the new $730 million Series D, the company said. CesiumAstro said the new capital will support its expansion into developing and operating its own satellite infrastructure.
CesiumAstro also introduced Synchronicity, a planned satellite constellation of 737 spacecraft. The company said the announcement follows a fully successful Element-1 mission. The release described the constellation as planned but did not name a launch date, cost, or other investors in the round. The company did not provide a timeline for the constellation.
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Elliot Marsh covers startups, IPO filings and the money behind them for Venturist. Elliot writes from SEC filings, company announcements and published reporting.