Thin Line Capital

Thin Line Capital is a Pasadena, California-based seed-stage venture fund founded by Aaron Fyke, a serial entrepreneur and co-founder of two clean energy unicorns. Now deploying its second fund, the firm invests $400K-600K in low-capex companies targeting renewable energy, electrification of transport, climate adaptation, and climate resilience. The portfolio includes companies in building decarbonization (Audette), wildfire detection (SenseNet), water risk management (Divirod), and air quality forecasting (Trace Air Quality), reflecting a strong thesis around software and IoT solutions that help industries adapt to climate change impacts.