The Tansy Charitable Foundation concentrates its giving on high-impact global health and humanitarian work, favoring organizations that deliver disease control, health system strengthening, and evidence-driven philanthropic interventions. It funds a very small set of large, multi-grant recipients with general-use/unrestricted support, indicating trust in recipient leadership and a strategic preference for measurable impact. The foundation appears aligned with effective-altruism-style priorities — supporting rigorous evaluation of intervention effectiveness (GiveWell) alongside operational global health partners (Partners In Health) and international disease eradication and human rights work (The Carter Center).
Highly concentrated: very large grants to a handful of repeat grantees, typically unrestricted/general-use funding across multiple grants rather than many small grants or geographically diffuse giving.
Tansy Charitable Foundation C/o Eric Wepsic has built a clear pattern of giving around a small set of large, repeat general-use grants. The single largest recent grant in the record is $17,000,000 to Givewell in 2025, followed by another $15,500,000 grant to the same recipient in 2024 and $11,000,000 in 2023. That kind of repeated support points to a funder that backs organizations over multiple years rather than making one-off gifts. The foundation’s recent portfolio also includes major support for Partners in Health and The Carter Center, both of which appear across multiple years in the grant list. Those awards are all marked general use, which suggests flexible support for core operations and mission delivery. Alongside those larger relationships, the foundation has made additional grants to Community Partners International, The Hertz Foundation, and a smaller gift to the University of Minnesota Foundation. Across the record, the foundation’s giving is concentrated in health, humanitarian, and evidence-oriented philanthropy, with a preference for substantial unrestricted grants to established nonprofits.
One central focus is evidence-driven global health philanthropy. In that area, Tansy Charitable Foundation C/o Eric Wepsic gave $17,000,000 to Givewell in 2025 for general use, extending a three-year sequence of support that also includes $15,500,000 in 2024 and $11,000,000 in 2023. A second thread is frontline health delivery. The foundation gave $10,000,000 to Partners in Health in 2025 for general use, after earlier general-use grants of $7,000,000 in both 2024 and 2023. A third area is international health and humanitarian work. The Carter Center received $7,000,000 in 2025, $5,000,000 in 2024, and $4,000,000 in 2023, all for general use. The record also includes support for Community Partners International and The Hertz Foundation, showing a mix of health-related and broader nonprofit support.
The typical grant size is large: the 25th percentile is $2,500,000, the median is $4,500,000, and the 75th percentile is $7,750,000. That sits well below the biggest individual grants, but still reflects high-dollar philanthropy. The pattern is recurring rather than one-off: Givewell, Partners in Health, The Carter Center, Community Partners International, and The Hertz Foundation each appear in multiple years. Grants are listed as general use, indicating flexible support. The funder is a regular funder, not a DAF, and it does not fund individuals or make program-related investments.
$50.1M
$452M
$61.8M
$50.4M
Most grants fall between $2.5M and $7.8M, with a median of $4.5M.
25th Percentile
$2.5M
Median
$4.5M
75th Percentile
$7.8M
About 0% of grants go to recipients in CA.
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Notable grantees: GiveWell, Partners In Health, The Carter Center
Grantmaking is entirely U.S.-based in the recent record, with 16 grants to U.S. recipients. California is the top state by grant count. Recent recipient cities include Oakland, San Francisco, and Pleasanton in California, plus Boston and Atlanta. One smaller grant went to the University of Minnesota Foundation in Minneapolis. The foundation’s HQ is New York, but none of the recent grants in the file went to recipients in New York.
The recent grants point to health, humanitarian, and evidence-oriented nonprofit work. Named recipients include Givewell, Partners in Health, The Carter Center, Community Partners International, The Hertz Foundation, and the University of Minnesota Foundation. The grant descriptions are all general use.
Yes. Several recipients appear across multiple years. Givewell received grants in 2023, 2024, and 2025; Partners in Health in 2023, 2024, and 2025; The Carter Center in 2023, 2024, and 2025; Community Partners International in 2023, 2024, and 2025; and The Hertz Foundation in 2023, 2024, and 2025.
The grant-size distribution is very large: the 25th percentile is $2,500,000, the median is $4,500,000, and the 75th percentile is $7,750,000. Recent awards range from $45,000 to $17,000,000.
California is the top state by grant count. Recent California recipients include Oakland, San Francisco, and Pleasanton. The broader recipient distribution in the file is entirely U.S.-based, with 16 grants to U.S. organizations.
The listed grants are all marked general use, including awards to Givewell, Partners in Health, The Carter Center, Community Partners International, The Hertz Foundation, and the University of Minnesota Foundation. That pattern indicates flexible support rather than project-specific funding.
2026
Source: IRS Form 990-PF, fiscal year 2026.
Most recent grants reported to the IRS.
| Recipient | Location | Amount | Year | Purpose |
|---|---|---|---|---|
| GIVEWELL | OAKLAND, CA | $25,000,000 | 2026 | GENERAL USE |
| PARTNERS IN HEALTH | BOSTON, MA | $10,000,007 | 2026 | GENERAL USE |
| THE CARTER CENTER | ATLANTA, GA | $7,000,000 | 2026 | GENERAL USE |
| THE HERTZ FOUNDATION | PLEASANTON, CA | $3,500,000 | 2026 | GENERAL USE |
| COMMUNITY PARTNERS INTERNATIONAL | SAN FRANCISCO, CA | $3,000,009 | 2026 | GENERAL USE |
| DIGITAL HARBOR | BALTIMORE, MD | $1,000,000 | 2026 | GENERAL USE |
| PRESIDENTS AND FELLOWS OF HARVARD COLLEGE | CAMBRIDGE, MA | $600,000 | 2026 | GENERAL USE |
| GIVEWELL | OAKLAND, CA | $17,000,000 | 2025 | GENERAL USE |
| PARTNERS IN HEALTH | BOSTON, MA | $10,000,000 | 2025 | GENERAL USE |
| THE CARTER CENTER | ATLANTA, GA | $7,000,000 | 2025 | GENERAL USE |
| THE HERTZ FOUNDATION | PLEASANTON, CA | $2,500,000 | 2025 | GENERAL USE |
| COMMUNITY PARTNERS INTERNATIONAL | SAN FRANCISCO, CA | $2,500,000 | 2025 | GENERAL USE |
| GIVEWELL | OAKLAND, CA | $15,500,000 | 2024 | GENERAL USE |
| PARTNERS IN HEALTH | BOSTON, MA | $7,000,000 | 2024 | GENERAL USE |
| THE CARTER CENTER | ATLANTA, GA | $5,000,000 | 2024 | GENERAL USE |
| COMMUNITY PARTNERS INTERNATIONAL | SAN FRANCISCO, CA | $2,500,000 | 2024 | GENERAL USE |
| THE HERTZ FOUNDATION | PLEASANTON, CA | $2,000,000 | 2024 | GENERAL USE |
| UNIVERSITY OF MINNESOTA FOUNDATION | MINNEAPOLIS, MN | $45,000 | 2024 | GENERAL USE |
| GIVEWELL | OAKLAND, CA | $11,000,000 | 2023 | GENERAL USE |
| PARTNERS IN HEALTH | BOSTON, MA | $7,000,000 | 2023 | GENERAL USE |
| THE CARTER CENTER | ATLANTA, GA | $4,000,000 | 2023 | GENERAL USE |
| COMMUNITY PARTNERS INTERNATIONAL | SAN FRANCISCO, CA | $2,500,000 | 2023 | GENERAL USE |
| THE HERTZ FOUNDATION | PLEASANTON, CA | $2,000,000 | 2023 | GENERAL USE |
PARTNERS IN HEALTH
$10,000,007GENERAL USE
THE HERTZ FOUNDATION
$3,500,000GENERAL USE
DIGITAL HARBOR
GENERAL USE
THE HERTZ FOUNDATION
$2,500,000GENERAL USE
THE HERTZ FOUNDATION
$2,000,000GENERAL USE
THE HERTZ FOUNDATION
$2,000,000GENERAL USE