What Are Foundations in America
A foundation in America is a nonprofit entity that holds and deploys assets for charitable, educational, or scientific purposes. Most are organized as private foundations or public charities under Section 501(c)(3) of the Internal Revenue Code. Private foundations typically receive funding from a single family, individual, or corporation, while public charities raise money from the public or government contracts. The IRS tracks exempt organizations through Form 990 filings, which disclose assets, grants, and compensation. For an overview of exempt organization types, see the IRS guidelines on tax-exempt organizations https://www.irs.gov/charities-non-profits/exempt-organizations.
Foundations in America hold trillions of dollars in combined assets and distribute billions in grants annually. The Foundation Center, now part of Candid, maintains the most comprehensive database of U.S. grantmakers. Grantmaking spans education, health, environment, arts, and community development. Many large foundations use mission-related investments and program-related investments to align capital with social goals. For recent data on grantmaking volumes, see Candid's philanthropy landscape reports https://candid.org/learning-lab/grantsmart-for-beginners/.
Types and Structures of U.S. Foundations
Private Foundations vs Public Charities
Private foundations usually derive their funds from a single source and must distribute at least 5% of their net investment assets annually for charitable purposes. They often pay excise taxes on net investment income under Section 4940 of the tax code. Public charities, including community foundations and operating foundations, receive support from the public, government, or multiple sources. Community foundations pool donations from many donors to fund local grants and endowments. The National Philanthropic Trust, one of the largest grantmaking organizations, operates as a public charity that manages donor-advised funds https://www.ntp.org/.
Operating Foundations and Supporting Organizations
Operating foundations run their own charitable programs rather than primarily making grants. They must meet specific IRS tests for active program expenditures. Supporting organizations, sometimes called Type I, II, or III, are designed to support one or more public charities. They simplify donor administration while maintaining tax advantages. Both structures are common among large family offices and corporate philanthropy units. For details on supporting organization rules, see IRS Publication 557 on tax-exempt organizations https://www.irs.gov/pub/irs-pdf/p557.pdf.
Major Foundations and Industry Trends
Largest Grantmakers and Asset Managers
The Bill & Melinda Gates Foundation remains one of the largest private foundations globally, with assets deployed across global health, development, and education. The Ford Foundation focuses on social justice and equity, with a portfolio that includes mission-related investments in affordable housing and financial inclusion. The Rockefeller Foundation emphasizes innovation in health, food systems, and energy transition. Many of these institutions partner with asset managers and banks for endowment management and impact investing strategies. For financial disclosures of major foundations, see IRS Form 990-PF filings on ProPublica's Nonprofit Explorer https://projects.propublica.org/nonprofits/.
Impact Investing and Regulatory Environment
Impact investing has grown among foundations seeking market-rate returns alongside social outcomes. Program-related investments and mission-related investments allow foundations to allocate capital to private equity, real estate, and debt