CesiumAstro, a global leader in space and defense communications systems and satellites, announced the closing of $730 million in Series D financing, valuing the company at more than $4.5 billion. The financing brings CesiumAstro's total capital announced in 2026 to more than $1.2 billion and supports its expansion into developing and operating its own satellite infrastructure.

The equity round was led by Janus Henderson, with participation from Insight Partners, Sands Capital, Sumitomo Corporation of Americas, Woven Capital - Toyota's Growth Fund, Incharge Capital, Magnetar, AV, and NewSpace Capital, alongside $100 million in debt financing provided through the Export-Import Bank of the United States (EXIM) and JPMorgan.