Foundation Source

Foundation Source provides philanthropic software and services for private foundations, donor-advised funds and planned giving programs. It works with donors, families, wealth advisors, family offices, nonprofits and financial institutions. The firm was started in 2000 as Charity Planner by brothers Neil and Avi Greenbaum, took the Foundation Source name in 2001, and is headquartered in Fairfield, Connecticut. Private equity firm GTCR acquired it in 2023. As of December 31, 2025, Foundation Source supports more than 5,600 private foundations, 20,000 DAF accounts and 1,700 nonprofits. It administers more than $55 billion in charitable assets and facilitates more than 190,000 grants and planned gifts a year.

What the firm does

• Private foundation services: creation and full management of private foundations, including administration, grantmaking, compliance and tax filings.
• Foundation Platform: software to manage every activity of a foundation online.
• Donor-advised funds: white-labeled DAF programs for wealth managers and nonprofits, plus FundOS for DAF sponsors.
• Planned giving: gift administration, compliance, consulting and marketing.
• Philanthropic advisory: an in-house team of specialists with deep regulatory experience.
• GrantSafe: checks a charity's tax-exempt status before a grant is made.

For family offices

Family offices that run or plan a family foundation can outsource its back office, including compliance, grant administration and tax returns, to Foundation Source while the family keeps control of giving decisions. Multi-family offices and private banks can offer white-labeled DAF and foundation programs to their clients. Foundation Source won the 2026 Family Wealth Report Award for Philanthropy Advice. Families building a wider philanthropy and governance stack may also look at entity tools such as Athennian.

Considerations and fit

Foundation Source focuses on philanthropy and does not manage the foundation's investments, which stay with the family's chosen advisors. It is US-focused because its compliance work is built around US private foundation rules. Pricing is not published.

Frequently asked questions

Who owns Foundation Source?

Foundation Source was acquired by the private equity firm GTCR in 2023. It was founded in 2000 by Neil and Avi Greenbaum.

How many foundations does Foundation Source support?

More than 5,600 private foundations, along with 20,000 DAF accounts and 1,700 nonprofits, as of December 31, 2025.

Does Foundation Source offer white-label donor-advised funds?

Yes. Its DAF Platform provides white-labeled donor-advised fund programs for wealth managers and nonprofits.

• Create and administer private foundations
• Grant administration and compliance
• Foundation tax filings
• White-label donor-advised fund programs
• Planned giving administration
• Philanthropic advisory

• Foundation Platform software
• Full outsourced foundation administration
• White-labeled DAF Platform
• FundOS for DAF sponsors
• Enterprise Console with SSO for institutions
• Planned giving solutions
• In-house philanthropic advisory team
• GrantSafe charity status checks
• Endowment sub-accounting

Built for Private Wealth Owners / Principals, Single Family Office (SFO), Multi Family Office (MFO), Advisors / Wealth Advisors (RIA).

Yes

Client services team; office 800-839-0054