Venus Aerospace Secures $91M Series B for Rocket Engine

Venus Aerospace closed a $91 million Series B round, the company announced Monday. The Houston-based startup will use the funds to scale its rotating detonation rocket engine from a working prototype toward a production-ready system with multiple applications.

Venus completed a demonstration launch with its test vehicle in May 2025, validating the engine design. The company said the new capital will accelerate development and expand the engine's potential uses.

The round was anchored by Mercury Fund, a Houston venture firm. Lockheed Martin Ventures, the corporate venture arm of LMT, also participated. Other investors included MESH, PEAK6, Draper Associates, Starboard Star Venture Capital, and Green Sands Equity.