Grantmaker Investors in Climate Tech

The Barr Foundation is a Boston-based philanthropic organization focused on advancing climate solutions, arts and creativity, and educational opportunity. Founded by Amos Hostetter Jr. and Barbara Hostetter, the foundation supports nonprofits and initiatives that drive systemic change and strengthen communities, particularly in the Boston region. Through long-term partnerships and flexible funding, Barr Foundation backs organizations working on climate resilience, clean energy transition, public education, and cultural vibrancy. Its approach emphasizes collaboration, innovation, and scaling solutions that can deliver lasting impact.

Bloomberg Philanthropies is the philanthropic organization of Michael Bloomberg, focused on improving lives at scale across the globe. The foundation works across more than 150 countries, supporting initiatives in public health, climate, education, government innovation, and the arts. Its approach combines data-driven decision-making with deep partnerships across governments, nonprofits, and institutions. Bloomberg Philanthropies is known for backing large-scale, measurable programs that aim to deliver systemic change and improve outcomes for millions of people worldwide.

Ford Foundation is one of the world’s largest philanthropic foundations, focused on advancing social justice, reducing inequality, strengthening democratic values, and expanding human dignity globally. Founded in 1936, the foundation supports nonprofits, movements, institutions, artists, researchers, and community leaders working to address systemic social, political, and economic challenges. The Ford Foundation operates across multiple regions worldwide and funds initiatives spanning democracy, racial justice, economic inclusion, technology and society, gender equity, arts and culture, journalism, and human rights.

The MacArthur Foundation is a private philanthropic foundation focused on advancing a more just, sustainable, and peaceful world through grantmaking, impact investments, fellowships, and institutional support. The foundation funds creative individuals, nonprofit organizations, research institutions, and mission-driven initiatives working across climate solutions, democracy, journalism, criminal justice reform, technology and society, global security, and community development. Known globally for the MacArthur Fellows Program, often referred to as the “Genius Grants,” the foundation combines long-term systems thinking with bold investments designed to address complex social and environmental challenges.

The Rockefeller Foundation is one of the world’s largest and most influential philanthropic organizations, focused on advancing human well-being through large-scale investments in energy access, food systems, health, economic opportunity, climate resilience, and emerging technologies. Founded in 1913, the foundation partners with governments, nonprofits, corporations, and local communities to tackle systemic global challenges through innovative finance, data, and technology-driven solutions. The foundation is known for making ambitious “big bets” aimed at improving the lives of hundreds of millions of people worldwide, particularly in underserved and economically vulnerable communities.