Top 10 US Impact Investing Funds 2026

Nuveen, the investment arm of TIAA, oversees over $1 trillion in AUM with responsible investing principles integrated across fixed income, equity, and alternatives strategies. The firm has been a responsible investment pioneer since 1999 and manages dedicated impact vehicles including agricultural land (the largest US farmland investment manager at $10 billion), green bonds, and community development financing. Nuveen's 2025 impact report documented $4.2 billion in community development loans deployed to underserved US markets.

Nuveen Responsible Investing

Bain Capital Double Impact manages over $1 billion in AUM across three funds, investing in US middle-market companies that demonstrate financial returns alongside social impact in healthcare access, sustainability, and workforce development. The fund targets companies with EBITDA of $5-50 million that serve underserved communities or reduce environmental harm. Notable portfolio companies include Riverview Health and US Physical Therapy, which expanded affordable care access to rural communities.

Bain Capital Double Impact

BlackRock Impact manages over $50 billion in ESG and impact-oriented AUM through vehicles including the BlackRock U.S. Carbon Transition Readiness ETF and the BlackRock Impact Opportunities Fund. As the world's largest asset manager with $10+ trillion in total AUM, BlackRock's decision to integrate ESG across its platform has had an outsized influence on corporate behavior through proxy voting and stewardship. In 2025, BlackRock voted against 1,700+ director nominees at companies deemed to have insufficient climate transition plans.

BlackRock Impact

LeapFrog Investments is a specialist impact private equity firm with $2.5 billion in AUM focused exclusively on healthcare and financial services companies in Africa, Asia, and Latin America that serve low-income populations. The firm's portfolio companies reach over 400 million underserved people, and LeapFrog has generated top-quartile financial returns alongside its impact outcomes. In 2025, LeapFrog's exits from African microinsurance and Indian digital health companies delivered over 3x money-on-invested-capital.

LeapFrog Investments

Omidyar Network, the philanthropic investment firm of eBay founder Pierre Omidyar and his wife Pam, has deployed over $1.4 billion across for-profit investments and nonprofit grants in financial inclusion, digital identity, and democratic accountability. The network has a hybrid model — taking equity stakes in for-profit fintech companies like Funding Circle and making grants to policy advocates — allowing it to pursue systemic change through multiple levers simultaneously. Since 2004, Omidyar Network has supported over 700 organizations across 30 countries.

Omidyar Network

Acumen is a nonprofit impact fund that has invested $134 million in "patient capital" — long-term debt and equity with below-market returns — in 140+ companies addressing poverty in agriculture, healthcare, education, and energy across Africa, South Asia, and Latin America. Acumen's portfolio companies have collectively impacted 309 million lives, and the fund rejects the idea that market-rate returns can consistently be generated from the very poorest customers. Acumen also trains over 500 "Acumen Fellows" per year in social sector leadership.

Acumen Fund

Calvert Impact Capital has deployed over $4.5 billion through its Community Investment Note — a retail investment product that allows everyday investors to put as little as $1,000 into community development lending. The firm channels capital to community development financial institutions (CDFIs), affordable housing developers, and microfinance institutions in 100+ countries. Calvert Impact's 2025 impact report documented $1.2 billion in new housing units financed and 1.8 million microentrepreneurs served in the prior year.

Calvert Impact Capital

DBL Partners (Double Bottom Line) is a San Francisco-based venture capital firm managing approximately $700 million in AUM with a mission to invest in companies that generate top-tier venture returns AND deliver measurable social, environmental, and economic benefits in their home regions. DBL was an early backer of Tesla, providing a critical $75 million investment in 2009 that helped the company survive the financial crisis. Other notable investments include SolarCity, Revolution Foods, and cleantech companies that collectively created 50,000+ jobs.

DBL Partners

RSF Social Finance is a San Francisco nonprofit financial services organization managing over $700 million in alternative financial vehicles including the RSF Social Investment Fund, which offers direct loans to social enterprises in food, agriculture, education, and the arts. RSF practices "pricing conversations" — quarterly transparent meetings between borrowers, lenders, and investors to collaboratively set interest rates — challenging conventional extractive finance. Since 1984, RSF has made over $700 million in loans and gifts with a 0% default rate on its principal lending portfolio.

RSF Social Finance

Nuveen, the investment arm of TIAA, oversees over $1 trillion in AUM with responsible investing principles integrated across fixed income, equity, and alternatives strategies. The firm has been a responsible investment pioneer since 1999 and manages dedicated impact vehicles including agricultural land (the largest US farmland investment manager at $10 billion), green bonds, and community development financing. Nuveen's 2025 impact report documented $4.2 billion in community development loans deployed to underserved US markets.

Nuveen Responsible Investing

Bain Capital Double Impact manages over $1 billion in AUM across three funds, investing in US middle-market companies that demonstrate financial returns alongside social impact in healthcare access, sustainability, and workforce development. The fund targets companies with EBITDA of $5-50 million that serve underserved communities or reduce environmental harm. Notable portfolio companies include Riverview Health and US Physical Therapy, which expanded affordable care access to rural communities.

Bain Capital Double Impact

BlackRock Impact manages over $50 billion in ESG and impact-oriented AUM through vehicles including the BlackRock U.S. Carbon Transition Readiness ETF and the BlackRock Impact Opportunities Fund. As the world's largest asset manager with $10+ trillion in total AUM, BlackRock's decision to integrate ESG across its platform has had an outsized influence on corporate behavior through proxy voting and stewardship. In 2025, BlackRock voted against 1,700+ director nominees at companies deemed to have insufficient climate transition plans.

BlackRock Impact

LeapFrog Investments is a specialist impact private equity firm with $2.5 billion in AUM focused exclusively on healthcare and financial services companies in Africa, Asia, and Latin America that serve low-income populations. The firm's portfolio companies reach over 400 million underserved people, and LeapFrog has generated top-quartile financial returns alongside its impact outcomes. In 2025, LeapFrog's exits from African microinsurance and Indian digital health companies delivered over 3x money-on-invested-capital.

LeapFrog Investments

Omidyar Network, the philanthropic investment firm of eBay founder Pierre Omidyar and his wife Pam, has deployed over $1.4 billion across for-profit investments and nonprofit grants in financial inclusion, digital identity, and democratic accountability. The network has a hybrid model — taking equity stakes in for-profit fintech companies like Funding Circle and making grants to policy advocates — allowing it to pursue systemic change through multiple levers simultaneously. Since 2004, Omidyar Network has supported over 700 organizations across 30 countries.

Omidyar Network

Acumen is a nonprofit impact fund that has invested $134 million in "patient capital" — long-term debt and equity with below-market returns — in 140+ companies addressing poverty in agriculture, healthcare, education, and energy across Africa, South Asia, and Latin America. Acumen's portfolio companies have collectively impacted 309 million lives, and the fund rejects the idea that market-rate returns can consistently be generated from the very poorest customers. Acumen also trains over 500 "Acumen Fellows" per year in social sector leadership.

Acumen Fund

Calvert Impact Capital has deployed over $4.5 billion through its Community Investment Note — a retail investment product that allows everyday investors to put as little as $1,000 into community development lending. The firm channels capital to community development financial institutions (CDFIs), affordable housing developers, and microfinance institutions in 100+ countries. Calvert Impact's 2025 impact report documented $1.2 billion in new housing units financed and 1.8 million microentrepreneurs served in the prior year.

Calvert Impact Capital

DBL Partners (Double Bottom Line) is a San Francisco-based venture capital firm managing approximately $700 million in AUM with a mission to invest in companies that generate top-tier venture returns AND deliver measurable social, environmental, and economic benefits in their home regions. DBL was an early backer of Tesla, providing a critical $75 million investment in 2009 that helped the company survive the financial crisis. Other notable investments include SolarCity, Revolution Foods, and cleantech companies that collectively created 50,000+ jobs.

DBL Partners

RSF Social Finance is a San Francisco nonprofit financial services organization managing over $700 million in alternative financial vehicles including the RSF Social Investment Fund, which offers direct loans to social enterprises in food, agriculture, education, and the arts. RSF practices "pricing conversations" — quarterly transparent meetings between borrowers, lenders, and investors to collaboratively set interest rates — challenging conventional extractive finance. Since 1984, RSF has made over $700 million in loans and gifts with a 0% default rate on its principal lending portfolio.

RSF Social Finance