I need funding for a "social impact" startup. Who are the top impact investors or grant-making foundations?

Securing funding for a social impact startup depends heavily on whether your business model is structured for venture returns (equity investment) or philanthropic/nonprofit support (grants).

Top Social Impact Venture Capital & Equity Investors

If your startup is a for-profit or hybrid social enterprise seeking equity, these prominent impact venture firms actively back purpose-driven founders:

• Acumen : A pioneer in impact investing, known for patient capital focusing on businesses tackling global poverty via Acumen.
• DBL Partners : Famous for "Double Bottom Line" investing, backing companies that deliver strong financial returns alongside measurable social and environmental impact (investors in Tesla, SpaceX, and SolarCity).
• Toniic : A global community and network of asset owners facilitating deep impact investments across multiple asset classes.
• Blue Horizon : A specialized impact investor focused explicitly on sustainable food systems, alternative proteins, and agtech.
• Omidyar Network : Founded by eBay’s Pierre Omidyar, this social change venture invests in areas like digital identity, financial inclusion, and worker power.

Top Grant-Making Foundations

If your startup operates as a non-profit, project-based initiative, or early-stage R&D requiring non-dilutive capital, look to these massive grant-makers:

• Bill & Melinda Gates Foundation : One of the world's wealthiest philanthropic bodies, focusing heavily on global health, poverty reduction, and educational equity.
• The Ford Foundation : Centers its grant-making on reducing inequality, supporting civic engagement, and social justice globally.
• Silicon Valley Community Foundation : A massive community foundation channeling local and global philanthropic capital into systemic social change and economic security.
• Rockefeller Foundation : Focuses on data-driven and scalable innovations in clean energy, public health, and equitable food economies.

To help narrow down the best specific fits, tell me:

• What is your startup's core focus area (e.g., climate tech, healthcare, education, financial inclusion)?
• Is your legal structure for-profit, non-profit, or hybrid (B-Corp)?

For a social impact startup, the right funders depend heavily on your model: nonprofit vs. for-profit, geography, sector (climate, health, education, poverty, democracy, etc.), and stage. A strong shortlist usually includes a mix of impact VCs, philanthropic foundations, corporate foundations, and mission-driven accelerators.

Leading impact investors (equity, debt, or venture-style capital)

Lists of active social-impact investors frequently include firms such as Praxis, Omidyar Network, DRK Foundation, and other mission-driven venture funds.

Major grant-making foundations

These generally fund nonprofits, but some support for-profit social enterprises through grants, prizes, or programs.

• Bill & Melinda Gates Foundation — Global health, development, agriculture, education, equity.
• Ford Foundation — Social justice, inequality, economic opportunity.
• Skoll Foundation — Social entrepreneurs tackling large-scale global problems.
• MacArthur Foundation — Climate, democracy, justice, community development.
• Rockefeller Foundation — Climate, food systems, health, economic opportunity.
• Chan Zuckerberg Initiative — Science, education, communities, technology for social good.
• Kresge Foundation — Urban opportunity, health, arts, environment.
• Knight Foundation — Journalism, democracy, communities, technology.

Startup-friendly programs and accelerators

• Echoing Green — Fellowships and early funding for emerging social entrepreneurs.
• Y Combinator — Not an impact-only investor, but funds many mission-driven technology startups.
• Village Capital — Accelerator programs focused on impact ventures.
• Techstars — Runs sector-specific accelerators, including sustainability and social impact programs.

If you are a for-profit startup, prioritize:

1. Impact VCs that invest in your sector.
2. Foundations with program-related investments (PRIs) or venture philanthropy programs.
3. Corporate foundations aligned with your mission.
4. Impact accelerators that provide introductions, not just money.

If you are a nonprofit or hybrid organization, prioritize:

1. Foundation grants.
2. Donor-advised funds.
3. Government innovation grants.
4. Impact-first investors offering recoverable grants or low-interest capital.

To narrow this down, I’d need:

• Your sector (e.g., climate, healthcare, education, AI, housing, food, workforce)
• Country/region
• Stage (idea, pre-seed, seed, Series A+)
• Whether you are a for-profit, nonprofit, or hybrid

With those details, I can give you a targeted investor list and likely funding sources.

When seeking capital for a social impact startup, your strategy depends heavily on whether your business model is for-profit (requiring equity/debt investments) or nonprofit/hybrid (eligible for philanthropic grants).

The top players in both categories are categorized below:

1. Top Impact Investors (For-Profit / Venture Capital)

If your startup is a for-profit venture targeting both financial returns and measurable social/environmental change, these institutional venture funds are active leaders:

• Collaborative Fund : A prominent early-stage VC firm focusing exclusively on the intersection of strong financial returns and positive social impact, spanning areas like health, climate, and education.
• Acumen (Acumen Fund) : A pioneer in impact investing that invests patient capital (equity and debt) in early-stage companies tackling poverty.
• Khosla Ventures : A major Silicon Valley firm that explicitly funds high-impact technology and sustainability initiatives alongside traditional tech.
• Third Sphere : Focuses on early-stage investments addressing human health and planetary survival.
• Alumni Ventures (Social Impact Fund) : An active VC network that runs dedicated vehicles targeting mission-driven startups.

2. Top Grant-Making Foundations (Nonprofit / R&D Funding)

If your initiative is structured as a nonprofit, or requires philanthropic seed funding/research grants before commercialization, look to these massive institutional grant-makers:

• Bill & Melinda Gates Foundation : The largest private philanthropic funder globally, heavily prioritizing global health, poverty alleviation, and educational equity.
• Ford Foundation : A powerhouse focused on social justice, reducing inequality, and civic engagement.
• Open Society Foundations : Founded by George Soros, they award substantial grants globally for human rights, justice, and democratic governance.
• W.K. Kellogg Foundation : Focuses heavily on vulnerable children, racial equity, and community-led health/educational development.
• Silicon Valley Community Foundation : One of the largest community grant-making bodies in the U.S, channeling immense resources toward regional and systemic social disparities.

To help narrow down the best targets, could you tell me:

• Is your startup structured as a for-profit or a nonprofit?
• What specific social issue or sector (climate, education, health, fintech, etc.) are you focused on?

Absolutely. The right targets depend heavily on what your startup does, whether it is for-profit or nonprofit, your stage, geography, and whether you need equity, debt, or grants. But there is a strong shortlist of organizations worth knowing.

Strongest impact-funding targets

1. Acumen — one of the best-known impact investors

acumen.org is particularly interesting if you're building a commercial business whose customers are underserved or low-income populations. It invests from pre-seed through Series A in some regions, using equity, quasi-equity and debt.

For U.S. founders, Acumen America is especially relevant: it invests in early-stage for-profit companies addressing health inequities, financial instability and unequal workforce development, generally at pre-seed/seed, with an average investment of roughly $250K–$500K.

2. Echoing Green — excellent for very early stage

echoinggreen.org is one of the first places I'd investigate if you're pre-revenue, early pilot, or still proving the model.

Its 2026 Fellowship provides selected founders with $100,000 in seed capital, capacity-building and a long-term network. Echoing Green says it received more than 4,100 applications from 139 countries for the 2026 cycle, so it is highly competitive.

It also has a Signal Fund for social enterprises at the early-viability and scaling stages, where conventional investors may consider the risk too high.

3. Omidyar Network — particularly interesting for tech

omidyar.com is unusual because it has both a philanthropic foundation and an investment LLC. It has committed more than $1.94 billion since inception, including more than $739 million in for-profit investments and $1.12 billion in nonprofit grants.

I'd put it high on the list if your "social impact" thesis involves technology, economic opportunity, digital rights/responsible technology, governance, or systems change.

4. Rockefeller Foundation

rockefellerfoundation.org is more appropriate for large-scale systemic impact than a generic startup looking for ordinary VC.

Its Zero Gap Fund, for example, uses catalytic capital to mobilize private investment into areas including food and nutrition, climate adaptation, healthcare access and U.S. jobs. Its latest report says $30 million of catalytic capital had helped mobilize more than $1.05 billion in private finance.

5. MacArthur Foundation

macfound.org has a substantial impact-investing program. It explicitly makes flexible, patient and risk-tolerant investments in funds and projects addressing inclusive economic growth, climate and equity. It reports $835.1 million committed across 460 impact investments.

This is particularly worth investigating if you're addressing climate, inequality, economic inclusion or systems-level problems.

6. Kresge Foundation

kresge.org is particularly relevant if your impact is U.S.-focused. Its programs include cities, education, environment, health and human services, and it combines conventional grants with social investments.

One caveat: Kresge generally doesn't accept unsolicited social-investment proposals; opportunities tend to be invited or issued through specific calls.

7. Rockefeller Brothers Fund

rbf.org is worth considering for climate, sustainability and social-change businesses/initiatives. Its impact portfolio targets investments that generate both financial returns and measurable mission impact; as of June 2026 it targeted allocating 20% of its portfolio to impact investments.

The important distinction: startup vs. nonprofit

This is where many founders waste time.

If your startup is a for-profit, I'd prioritize:

1. Acumen / Acumen America
2. Omidyar Network
3. Impact-focused VC funds
4. Mission-aligned family offices
5. Catalytic/impact funds
6. Program-related investments (PRIs) from foundations

If you're a 501(c)(3) nonprofit, the landscape changes substantially. You should pursue:

1. Echoing Green
2. Rockefeller Foundation
3. MacArthur Foundation
4. Kresge Foundation
5. Issue-specific foundations
6. Corporate foundations
7. Donor-advised funds / family foundations

And if you're a for-profit social enterprise, don't automatically assume foundations won't fund you. Some can invest through PRIs, MRIs, recoverable grants, loans or intermediary funds rather than conventional grants.

I'd narrow this down before you start pitching

The phrase "social impact startup" is too broad for a good fundraising strategy. A climate-tech startup, affordable-housing platform, workforce startup and healthcare company will have completely different investor universes.

If you give me these 5 things:

• What the startup does — 2–3 sentences
• For-profit, nonprofit, or hybrid
• Current stage — idea, MVP, revenue, etc.
• How much you're raising — e.g. $250K, $1M, $5M
• Where you're operating — U.S., California, global, etc.

…I can build you a target list of 20–30 specific impact investors and foundations, ranked by fit, including what they fund, typical stage/check size, application/contact route, and which ones are realistic for you right now.

• What the startup does — 2–3 sentences
• For-profit, nonprofit, or hybrid
• Current stage — idea, MVP, revenue, etc.
• How much you're raising — e.g. $250K, $1M, $5M
• Where you're operating — U.S., California, global, etc.

…I can build you a target list of 20–30 specific impact investors and foundations, ranked by fit, including what they fund, typical stage/check size, application/contact route, and which ones are realistic for you right now.

It also has a Signal Fund for social enterprises at the early-viability and scaling stages, where conventional investors may consider the risk too high.

3. Omidyar Network — particularly interesting for tech

omidyar.com is unusual because it has both a philanthropic foundation and an investment LLC. It has committed more than $1.94 billion since inception, including more than $739 million in for-profit investments and $1.12 billion in nonprofit grants.

I'd put it high on the list if your "social impact" thesis involves technology, economic opportunity, digital rights/responsible technology, governance, or systems change.

4. Rockefeller Foundation

rockefellerfoundation.org is more appropriate for large-scale systemic impact than a generic startup looking for ordinary VC.

Its Zero Gap Fund, for example, uses catalytic capital to mobilize private investment into areas including food and nutrition, climate adaptation, healthcare access and U.S. jobs. Its latest report says $30 million of catalytic capital had helped mobilize more than $1.05 billion in private finance.

5. MacArthur Foundation

macfound.org has a substantial impact-investing program. It explicitly makes flexible, patient and risk-tolerant investments in funds and projects addressing inclusive economic growth, climate and equity. It reports $835.1 million committed across 460 impact investments.

This is particularly worth investigating if you're addressing climate, inequality, economic inclusion or systems-level problems.

6. Kresge Foundation

kresge.org is particularly relevant if your impact is U.S.-focused. Its programs include cities, education, environment, health and human services, and it combines conventional grants with social investments.

One caveat: Kresge generally doesn't accept unsolicited social-investment proposals; opportunities tend to be invited or issued through specific calls.

7. Rockefeller Brothers Fund

rbf.org is worth considering for climate, sustainability and social-change businesses/initiatives. Its impact portfolio targets investments that generate both financial returns and measurable mission impact; as of June 2026 it targeted allocating 20% of its portfolio to impact investments.

The important distinction: startup vs. nonprofit

This is where many founders waste time.

Absolutely. If by “social impact startup” you mean a for-profit or hybrid company whose business model directly addresses a social/environmental problem, there is a useful group of investors and grant-makers to target.

The important distinction is that impact investors generally want an investable company, while foundations often provide non-dilutive grants—and some organizations do both.

My top targets

Particularly worth looking at

Acumen is one of the strongest names if your company serves low-income or underserved populations. It explicitly invests in early-stage, high-risk businesses using “Patient Capital,” prioritizing impact and long-term sustainability over maximizing financial returns. Its current areas include sustainable agriculture, education, renewable energy, healthy communities, dignified jobs and gender equality.

DRK Foundation is unusually relevant because it can fund for-profit companies. DRK says it generally supports post-pilot, pre-scale organizations, and for-profits are typically funded at Seed through Series A. It accepts applications year-round, although it funds only about 20 organizations annually from thousands of applicants.

Echoing Green is particularly attractive if you're very early and the founder/story is exceptional. It provides seed funding and leadership development through its Fellowship programs and has spent decades backing social entrepreneurs.

Blue Haven Initiative is interesting if you need an investor that thinks beyond conventional VC. It invests across asset classes, including direct investments, and combines market-rate investments with grants and catalytic capital. Its portfolio includes climate/clean energy, financial inclusion, education and healthcare.

Don't overlook foundations

Depending on your mission, I'd also investigate:

• Gates Foundation — global health, development, agricultural productivity, financial inclusion.
• Ford Foundation — inequality, economic justice, civic participation.
• MacArthur Foundation — climate, justice, economic opportunity and systems change.
• Kresge Foundation — health, housing, climate resilience, community development.
• Rockefeller Foundation — food, health, energy and economic opportunity.
• Skoll Foundation — established social entrepreneurs and organizations with demonstrated impact.

A useful shortcut is the Global Impact Investing Network (GIIN) Investors' Council, which includes Acumen, Blue Haven, Ford Foundation, Calvert Impact, Capricorn, Community Investment Management and other major impact-capital players.

One important 2026 consideration

Don't pitch simply as “a company that does good.” Impact investors increasingly expect a credible combination of:

commercial model + measurable impact + scalable economics.

That matters because the impact-investing market is increasingly concentrated around specific, measurable themes rather than generic ESG positioning. Recent industry data shows strong capital formation in areas such as clean energy and infrastructure, while broad “impact” funds have been less compelling.

For example, your pitch becomes much stronger if you can say:

“We reduce X by Y%, serve Z underserved customers, and can reach $50M in revenue at a 20% margin.” rather than:

“We're building a company that will make the world better.”

I can narrow this down substantially

If you tell me (1) what your startup does, (2) whether it's for-profit/nonprofit/hybrid, (3) current stage—idea, pre-revenue, revenue, Seed, etc., (4) how much you're seeking, and (5) where you're based, I can give you a targeted list of ~20 investors/foundations, including which ones are actually plausible for your stage, typical check/grant sizes, relevant portfolio companies, and application/contact links.

Funding a social impact startup depends heavily on your legal structure (for-profit social enterprise vs. non-profit/hybrid) and your growth stage. The landscape is split between Impact Venture Capital/Funds (which expect financial returns alongside social good) and Grant-Making Foundations/Accelerators (which offer non-dilutive capital).

Top Impact Venture Capital & Investment Funds

If your startup is a for-profit entity (like a Delaware PBC or LLC) designed to scale commercially while solving a social or environmental problem:

• Acumen: A pioneering global venture fund investing in early-stage companies that tackle poverty and lack of access to basic services. Check out their approach on the Acumen overview.
• DBL Partners: Famous for "double bottom line" investing, backing tech and cleantech startups that deliver strong financial returns alongside positive social/environmental impact.
• Third Sphere: Focused heavily on pre-seed and seed-stage impact startups, particularly around urban resilience, climate, and human health.
• Capria Ventures: Invests globally in tech-driven social impact startups scaling in emerging markets.
• American Family Insurance Institute for Corporate & Social Impact: Focuses on closing equity gaps, economic opportunity, and community resilience in the U.S.

Top Grant-Making Foundations & Innovation Awards

If your startup operates as a non-profit, utilizes a fiscal sponsor, or qualifies for philanthropic venture grants (non-dilutive funding):

• Draper Richards Kaplan (DRK) Foundation: Provides early-stage, multi-year unrestricted catalytic funding to social entrepreneurs starting new organizations (both non-profit and for-profit models under specific criteria). Explore their criteria on the DRK Foundation Application FAQ page.
• Skoll Foundation: Known for the prestigious Skoll Awards, investing in social entrepreneurs who have already built solutions driving large-scale, systemic change.
• Echoing Green: Runs a legendary fellowship and seed grant program specifically designed for emerging, early-stage social changemakers.
• Fast Forward: An essential accelerator and grant provider specifically focused on tech non-profits scaling social impact through software.
• Google.org / MacArthur Foundation (100Change): Offer major challenge grants for organizations leveraging technology or novel frameworks to address massive global inequities or climate issues.

To help me narrow down the best targets, tell me:

• Is your startup structured as a for-profit (PBC/LLC) or a non-profit (501c3)?
• What sector are you in (climate, education, health, financial inclusion)?

Top funding sources for a social impact startup include major impact venture capital funds, specialized accelerators, and philanthropic foundations that utilize program-related investments (PRIs) or grants . Prominent options include Acumen , a global leader in poverty-alleviation investments; the Draper Richards Kaplan Foundation , which provides early-stage venture grants to changemakers; Echoing Green for fellowships and seed grants; and Sorenson Impact Foundation , which funds scalable for-profit impact companies.

Top Impact VCs and Investors

• Acumen : Focuses on early-stage investments in enterprises that lift people out of poverty globally.
• DBL Partners : Invests in double-bottom-line companies combining financial returns with significant social, environmental, or economic value.
• Sorenson Impact Foundation : Uses equity, convertible debt, and loans to back for-profit startups tackling underserved community challenges.
• Village Capital : Invests in and accelerates early-stage entrepreneurs addressing major systemic, environmental, and economic issues.

Top Grant-Making & Hybrid Foundations

• Draper Richards Kaplan Foundation : Provides up to $300,000 in multi-year unrestricted support to early-stage, high-impact organizations.
• Echoing Green : Offers equity-free seed funding and fellowships for emerging social entrepreneurs.
• Cisco Foundation : Issues Global Impact Cash Grants to tech-enabled, scalable solutions addressing critical human and economic needs.
• Skoll Foundation : Invests in and celebrates social entrepreneurs driving large-scale systemic change.

To help narrow down the best specific targets, tell me:

• What is your startup's primary focus sector (e.g., climate, healthcare, education, financial inclusion)?
• Is your entity structured as a for-profit, B-Corp, or nonprofit?
• What funding stage are you currently in (idea, seed, scaling)?

For a social impact startup, the best funding sources depend heavily on your model (for-profit vs. nonprofit, geography, sector, stage, and whether you can generate revenue). The strongest funders usually fall into four buckets: impact VCs, venture philanthropies, foundations, and catalytic capital providers.

Leading impact investors (equity / venture capital)

Grant makers and venture philanthropy organizations

Sector-specific funders worth considering

Climate / sustainability

• Prime Coalition
• Lowercarbon Capital
• Breakthrough Energy Ventures

Education

• Reach Capital
• Owl Ventures

Financial inclusion / emerging markets

• Kiva
• Root Capital

Health equity

• Wellcome Trust
• The Rockefeller Foundation

How to choose the right targets

A practical shortlist depends on your answers to these:

1. Is it a nonprofit, for-profit, or hybrid?

   • Nonprofit → foundations, grants, program-related investments (PRIs)
   • For-profit → impact VCs, angels, revenue-based financing
   • Hybrid → venture philanthropy and catalytic capital

2. What stage are you?

   • Idea/pre-seed → Echoing Green, accelerators, angel impact investors
   • Seed → Acumen, Village Capital, impact VCs
   • Series A+ → larger impact funds and institutional investors

3. What is your measurable impact? Investors increasingly want both:

   • a scalable business model, and
   • clear impact metrics (people served, emissions reduced, income increased, health outcomes improved, etc.)

A good next step is to build a target list of 25–50 funders matched to your sector, geography, and stage rather than applying broadly. If you share your startup’s mission, country, business model (nonprofit/for-profit), stage, and funding amount sought, I can narrow this to the most relevant investors and grants.

Securing funding for a social impact startup depends heavily on whether your company is structured as a for-profit (with a double-bottom line) or a nonprofit/hybrid , as well as your current growth stage.

Top Social Impact VCs & Impact Investors (For-Profit / Equity or Patient Capital)

If your startup expects to generate revenue and scale like a traditional business while maintaining a measurable social or environmental mission, look at these leading firms:

• Acumen : A pioneer in "patient capital", Acumen invests seed and early-stage equity/debt in companies bringing critical goods and services (agtech, clean energy, health) to low-income populations.
• DBL Partners : Famous for "double bottom line" investing, they back high-growth companies that deliver top-tier financial returns alongside positive social, environmental, or economic impact (heavy focus on clean tech and sustainability).
• Social Impact Capital : Focuses on early-stage (pre-seed, seed, series A) startups tackling grand global challenges in human needs, health, housing, and social justice using an impact-driven thesis [1.20].
• TPG Rise : One of the largest private-market global impact investing platforms, focusing on scaling companies that drive measurable, positive social and environmental outcomes.
• Blue Earth Capital : An independent, global impact investment firm specializing in private equity and credit addressing pressing social and environmental challenges across emerging and developed markets.
• Michelson Impact Ventures : Deploys catalytic capital into for-profit startups innovating in education, healthcare, the future of work, and the human-animal bond.

Top Grant-Making Foundations & Venture Philanthropy (Non-Dilutive / Early-Stage Grants)

If you are pre-revenue, building a hybrid model, or need non-dilutive capital to prove your concept before taking venture money, explore these programs:

• Draper Richards Kaplan Foundation (DRK) : A premier venture philanthropy firm that finds, funds, and supports early-stage, high-impact social enterprises (both non-profit and for-profit) with unrestricted cash and hands-on board support.
• Echoing Green Fellowship : Provides unrestricted seed funding ($100,000 over 18 months) and deep leadership development to emerging social entrepreneurs globally.
• Skoll Foundation : Delivers substantial, systems-focused awards and funding for social innovators whose organizations have moved past the startup phase and are ready to shift root causes at scale.
• Ashoka : Best known for the Ashoka Fellowship, which offers a living stipend for up to three years with zero equity taken, alongside access to an elite global network of changemakers.
• Global Innovation Fund (GIF) : Invests in social innovations through a range of funding stages—from pilot funding ($230,000) up to large-scale transitions ($15 million) for ventures lifting people out of poverty.
• The Roddenberry Foundation (Catalyst Fund) : Offers smaller, quick-turnaround unrestricted grants ($2,500 to $15,000) explicitly tailored for early-stage, unconventional ideas addressing global challenges.

To help me narrow down the best specific fits, tell me:

• What is your startup's core focus area (e.g., climate tech, education, healthcare, financial inclusion)?
• Is your legal structure for-profit or nonprofit/hybrid , and what stage are you in (idea, prototype, early revenue)?

Absolutely. The key is to distinguish impact VC/equity investors from philanthropic grant-makers. The right targets depend heavily on whether your startup is a for-profit, nonprofit, or hybrid—and on the impact area.

Strong impact investors to look at

Grant-makers / non-dilutive capital

Echoing Green — One of the first places I'd investigate if you're early-stage. It supports emerging social entrepreneurs through fellowships and funding, and its network spans both nonprofit and social-enterprise models.

Draper Richards Kaplan Foundation — Particularly interesting for an early-stage social enterprise. DRK accepts applications year-round and specifically describes its process as funding social enterprises; its initial application is relatively lightweight.

Skoll Foundation — Major social-entrepreneurship funder, especially for organizations addressing large systemic problems. It tends to be more appropriate once there's meaningful traction.

Other major foundations worth investigating depending on your thesis include the Ford Foundation, MacArthur Foundation, Rockefeller Foundation, Chan Zuckerberg Initiative, Walton Family Foundation, Kresge Foundation, and W.K. Kellogg Foundation. Their programs are much more theme-specific, so I'd target the relevant program rather than approaching the foundation generically.

One important point

Don't pitch yourself simply as a "social impact startup." That's too broad for most funders.

A much stronger funding strategy is:

Problem → underserved population → measurable outcome → business model → why venture/grant capital accelerates the outcome

For example, "We use AI to improve healthcare" is unlikely to get much attention.
"We reduce missed appointments among Medicaid patients by 30%, generating $X of additional provider revenue while improving access for Y patients" gives an impact investor something concrete to underwrite.

If you tell me 5 things, I can narrow this to a much better target list

1. What the startup does
2. Who it serves
3. For-profit, nonprofit, or benefit corporation
4. How much you're trying to raise (e.g. $250K, $1M, $5M)
5. Current stage (idea, MVP, revenue, etc.)

I can then give you a ranked list of ~15–25 specific investors/foundations, including which ones actually fit your stage, check size, geography, impact area, and whether they provide grants vs. equity, rather than a generic impact-investor list.