What Is a Private Foundation and How to Use a Private Foundation List
A private foundation is a nonprofit organization funded primarily by a single source, such as an individual, family, or corporation, that distributes grants to other organizations. In the United States, private foundations are classified under Section 501(c)(3) of the Internal Revenue Code and must annually file Form 990-PF with the Internal Revenue Service. A private foundation list typically ranks organizations by total assets, annual grants, or contributions, and these lists rely on IRS public data, foundation annual reports, and independent databases. According to the National Philanthropic Trust, the largest U.S. foundations collectively hold hundreds of billions of dollars in assets and distribute billions in grants each year Forbes.
Using a private foundation list helps donors, researchers, and nonprofits identify major grantmakers, compare giving patterns, and find potential funding partners. The list usually includes the foundation name, location, total assets, annual giving, primary focus areas, and links to IRS filings. Many private foundations are donor-advised funds or supporting organizations that operate under a public charity umbrella but still appear in foundation-focused databases. Search tools from organizations like the Foundation Center and GuideStar allow users to filter a private foundation list by geography, sector, asset size, and grant activity.
Largest Private Foundations in the United States
The Bill & Melinda Gates Foundation remains the largest private foundation in the United States by total assets and annual giving, with assets exceeding $50 billion and annual grants frequently surpassing $5 billion, according to its public IRS filings and annual reports Gates Foundation. The Chan Zuckerberg Initiative, founded by Mark Zuckerberg and Priscilla Chan, operates as a limited liability company but is often included in private foundation lists due to its scale and philanthropic focus areas in science, education, and housing.
The Ford Foundation, founded in 1936, has historically ranked among the top foundations by assets and annual grants, with assets exceeding $16 billion and a focus on social justice, human rights, and democratic values. The Rockefeller Foundation, established in 1913, continues to appear near the top of any private foundation list with assets over $10 billion and a focus on health, food systems, and energy transition Rockefeller Foundation. The Lilly Endowment, funded by Eli Lilly and Company stock, consistently ranks among the largest by assets with a focus on community development, education, and religion in Indiana and beyond.
Corporate and Family Foundations in the Top Rankings
Corporate foundations such as the Bloomberg Philanthropies and the Walton Family Foundation appear prominently in private foundation lists, with assets in the tens of billions and grantmaking across education, public health, climate, and economic mobility. The Charles Koch Foundation and the David H. Koch Foundation, linked to the Koch family, are frequently cited in private foundation lists for their political and policy-related giving, as well as support for science and arts institutions.
How to Search and Verify a Private Foundation List
The Internal Revenue Service provides free access to Form 990-PF filings through its Exempt Organizations Business Master File and through third-party tools like ProPublica's Nonprofit Explorer, which allows users to search a private foundation list by name, EIN, or location ProPublica Nonprofit Explorer. The Foundation Center, now part of Candid, maintains a searchable database of private foundations with grant records, financials, and organizational profiles that can be filtered to build a customized private foundation list for research or fundraising.
State charity registration offices, such as the New York State Charities Bureau and the California