Windborne Systems

WindBorne Systems is a Redwood Shores, California-based climate technology company founded in 2019 by Kai Marshland, John Dean, and Paige Brown, originating as a Stanford Space Initiative project. The company designs, builds, and operates Atlas, a constellation of long-duration smart weather balloons that collect atmospheric data in regions underrepresented by existing weather infrastructure. WindBorne pairs this balloon network with WeatherMesh, a deep-learning forecasting model that ingests balloon, satellite, and ground-station observations to generate global weather predictions. The company has secured contracts with the U.S. Navy and Air Force to support operational government weather-forecasting models. On August 5, 2026, WindBorne announced a $37 million Series B round co-led by Khosla Ventures and Galvanize, valuing the company at $250 million.