Helium-3 Ventures is a venture capital firm backing founders building companies for Earth and beyond, with an early-stage focus across climate, energy, space, AI, robotics, construction, fintech, commerce and health-related startups. It invests in the United States and United Kingdom and has acted as a lead investor. Portfolio companies include Astranis, Boom Supersonic, Figure AI, Princeton NuEnergy and Sage Geosystems.