Company lists · Data refreshed September 2026
Top 25 Private foundations based in the United States
RevenueBase identified 93 private foundations headquartered in the United States as of September 2026 and tracks 1,102 professional contacts across them, including 618 with verified work emails. Atlanta is the largest hub.
This list covers private foundations headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest private foundations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 268 contacts → | ||||
Partial evidence “As the nation’s largest provider of foundation management services, we’re a trusted source for philanthropic expertise.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 258 contacts → | ||||
Partial evidence “National Philanthropic Trust is a public charity dedicated to providing philanthropic expertise to donors, foundations and financial institutions, enabling them to realize their…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 37 contacts → | ||||
Strong evidence “Sterling Foundation Management is the oldest national private foundation management firm in the country and is the nation's leading facilitator of sales of income interests in…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 36 contacts → | ||||
Partial evidence “Aspiring to maximize the power of giving, Ignite Philanthropy works with private donors and non-profit organizations to leverage their resources and ideas to achieve greater…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 32 contacts → | ||||
Partial evidence “Pacific Foundation Services partners with philanthropists to support nonprofits and help communities thrive.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 28 contacts → | ||||
Partial evidence “GMA Foundations helps you define a clear path to transformative philanthropy, and then walks the path with you as an ally and a guide.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 21 contacts → | ||||
Partial evidence “The Community Foundation of Greater Memphis' mission is to strengthen the community through philanthropy.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 21 contacts → | ||||
Indirect evidence “We connect people who care with causes that matter.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 19 contacts → | ||||
Strong evidence “The Christensen Fund is a private foundation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 15 contacts → | ||||
Indirect evidence “Burton D.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 contacts → | ||||
Indirect evidence “CTAC has been providing comprehensive solutions to charitable organizations, professional service providers, and philanthropically motivated individuals nationwide since it was…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Partial evidence “The Peter and Carmen Lucia Buck Foundation (PCLB) was formed in by Dr.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 contacts → | ||||
Partial evidence “Richmond Jewish Foundation is a primary, trusted and expert resource for planned giving and endowments.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 9 contacts → | ||||
Partial evidence “The Jewish Community Foundation of Greater Kansas City provides customized creative strategies to help individuals and families give smarter and to build charitable resources for…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 9 contacts → | ||||
Partial evidence “The Oklahoma Methodist Foundation is a non-profit foundation that will help you invest in lasting good.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 contacts → | ||||
Partial evidence “The Gates Family Foundation is committed to advancing long-term quality of life for all Coloradans, through support for educational equity, vibrant and sustainable communities…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 8 contacts → | ||||
Partial evidence “Park County Community Foundation is a public foundation solely dedicated to Park County’s charitable community, working in partnership with generous donors and community leaders…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 7 contacts → | ||||
Indirect evidence “Fiscal sponsors play a vital role in the nonprofit sector by providing the legal, financial, and administrative infrastructure that allows charitable initiatives to launch and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 6 contacts → | ||||
Partial evidence “The Jewish Community Foundation of Southern Arizona (JCF) works with individuals and families, and their professional advisors, who are interested in supporting what they care now…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 5 contacts → | ||||
Strong evidence “The Golisano Foundation is one of the largest private foundations and is based out of 7632 County Road 42, Victor, New York, 14564-8906, United States.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 5 contacts → | ||||
Indirect evidence “The William H.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 5 contacts → | ||||
Strong evidence “The Steele Foundation, a private Arizona based foundation, is focused on investing in children to educate, empower and enrich their lives.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 4 contacts → | ||||
Strong evidence “THE BOEDECKER FOUNDATION is a private philanthropic foundation started by George B Boedecker jr.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 4 contacts → | ||||
Strong evidence “Red String Foundation: EIN: 84-4020796 The Red String Foundation is a philanthropic 501c3 private foundation.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 3 contacts → | ||||
Partial evidence “The Louisiana Baptist Foundation exists to Advance the Kingdom: One dollar at a time.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: private foundations. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names private foundations.
- Partial evidence
- Its own public description names part of private foundations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name private foundations. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 93 private foundations based in the United States
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Private foundations based in the United States at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 93 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among private foundations, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “private foundations”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names private foundations), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among private foundations, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 618 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names private foundations, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many private foundations are there based in the United States?
RevenueBase identified 93 private foundations headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Foundation Source, headquartered in Fairfield, tops this list with the largest team on record.
Which city has the most private foundations?
Atlanta leads with 3 headquartered companies, followed by Los Angeles (3) and Boston (2).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 618 verified decision-maker contacts tracked across these 93 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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