Aetherflux closes $275M Series B, rebrands to Cowboy Space

Aetherflux/Galactic Brain

Aetherflux closed a $275M Series B at a $2B valuation, led by Index Ventures, in May 2026 and rebranded to Cowboy Space Corporation. The company broadened its mission beyond orbital data centers to vertically-integrated space infrastructure, including in-house launch vehicles, to accelerate AI compute capability deployment.

• Series B raised $275 million at $2 billion post-money valuation.
• Led by Index Ventures; expanded investor base includes prior backers.
• Company renamed Cowboy Space Corporation to reflect expanded mission.
• Mission broadened: launch vehicles + space-based power + orbital compute.
• Goal: end-to-end space infrastructure to bypass Earth data center bottlenecks.