Prime Impact Fund is structured as a nonprofit-governed venture fund using 100% catalytic capital instead of conventional LP capital, allowing it to prioritize climate impact over financial returns and maintain mission primacy through legal and operational embedding. The fund explicitly fills the "critical capital gap" for hard-tech, capital-intensive climate solutions that are too risky and slow for mainstream VC, using a strict three-part investment screen requiring at least 0.5 gigatons CO2e impact potential, proof of additionality, and a clear path to follow-on commercial funding.