Ecosystem Integrity Fund (EIF) is a sustainability-focused venture capital firm that invests in early growth-stage companies contributing to environmental sustainability. Founded in 2010, EIF has raised over $425 million across four funds, making it one of the longest-tenured environmentally focused venture capital firms. The firm takes a systems-based approach to sustainability investment, studying both the drivers for change and the constraints to innovation in market niches that are ripe for development.

EIF's investment focus areas include renewable energy, power grid management, energy efficiency, electric/efficient transportation, green chemistry, waste reduction, agriculture, and sustainable foods. The firm seeks to demonstrate that there is no trade-off between having a positive impact and achieving outstanding financial returns. EIF's mission is to use private capital to accelerate the transition to sustainability, resulting in a healthier planet, healthier communities, and strong economic growth.