Winiarski Family Foundation
The Winiarski Family Foundation is a private foundation based in Yountville, California. Its website says Warren and Barbara Winiarski and the foundation have donated to conservation and preservation efforts, including the Smithsonian’s National Museum of American History, the University of California, Davis, St. John’s College, and organizations in Napa County.
Winiarski Family Foundation at a glance
In short: Winiarski Family Foundation gave $43.1M across 3 grants in 2025 (avg $14.4M), mostly in New Mexico. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $43,067,701
- +203.1% vs 2024
- Grants made (2025)
- 3
- -50.0% vs 2024
- Average grant
- $14,355,900
- +506.3% vs 2024
- Median grant
- $3,121,614
- Total assets
- $1,658,682
- -8.0% vs 2024
- Primary geography
- New Mexico (87% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
How to apply to Winiarski Family Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: PO Box 3327, Yountville, CA 94599
Phone: (707) 224-8822
Website: https://warrenwiniarski.com
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Winiarski Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 3 recipients in 2025
The largest 2025 recipient was St Johns College ($37.5M). Together the top 3 received $43.1M.
Grant Size Distribution
126 grants across all recorded years
The most common grant size was under $50K: 106 grants of 126 (84%).
Geographic Focus
Where this funder awards grants
In 2025, 87% of grant dollars went to recipients in New Mexico, 7% to recipients in Washington, DC, and 6% to recipients in California. The foundation’s website also names supported organizations in Napa County and reports support for Colorado Mesa University.
Grant Distribution by State
Share of 2025 grant dollars across all 3 itemized grants.
States
Cities
How Winiarski Family Foundation gives
- Giving grew 4534% from 2022 to 2025. Method
- In 2025 it paid out well above its IRS minimum distribution (the 5% rule). Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2025, annual grant giving ranged from $911K (2020) to $43.1M (2025). In 2025 it made 3 grants totaling $43.1M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| St Johns College Santa Fe, NM | Financial Support for the Organization | $37,500,000 |
| Smithsonian Institution Washington, DC | Financial Support for the Organization | $3,121,614 |
| Uc Davis Foundation Davis, CA | Financial Support for the Organization | $2,446,087 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2025 | $1,658,682 | $42,977,618 | $43,104,918 | $43,067,701 | 3 | $43,087,360 | $67,929 | $84,181 |
| 2024 | $1,803,226 | $2,450,508 | $14,291,128 | $14,206,820 | 6 | $14,238,389 | $1,865,232 | $382,027 |
| 2023 | $13,626,602 | $727,076 | $4,148,275 | $3,970,514 | 28 | $4,051,279 | $638,962 | $85,095 |
| 2022 | $17,047,801 | $450,546 | $1,022,437 | $929,344 | 41 | $934,286 | $367,503 | $892,180 |
| 2021 | $20,704,786 | $1,029,658 | $1,070,014 | $949,587 | 48 | $958,844 | $931,511 | $955,261 |
| 2020 | $20,012,205 | $256,932 | $1,007,017 | $910,500 | 46 | — | $316,295 | $943,668 |
Under IRS private-foundation payout rules, Winiarski Family Foundation reported a distributable amount of $84K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its website reports support for conservation and preservation efforts, and describes specific projects involving wine writing, viticulture, and climate research.
Among its 2025 grantees, St. John’s College describes its mission as a distinctive liberal arts curriculum centered on collaborative inquiry and the study of original texts. The Smithsonian Institution states that its mission is the “increase and diffusion of knowledge,” through preserving heritage, discovering knowledge, and sharing resources.
Grantmaking
In filing year 2025, the foundation reported three grants totaling $43,067,701. Grant amounts ranged from $2,446,087 to $37,500,000, with a median of $3,121,614. It reported six grants totaling $14,206,820 in 2024 and 28 grants totaling $3,970,514 in 2023.
The largest reported 2025 grants were $37,500,000 to St. John’s College, $3,121,614 to the Smithsonian Institution, and $2,446,087 to the UC Davis Foundation. Each was listed for “financial support for the organization.”
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Greg Bennett as president and director, Stacy Madigan as secretary and director, and Thomas Suniville as CFO and director.
Winiarski Family Foundation is led by Greg Bennett, President & Director since 2024 (on filings since 2020); none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Greg Bennett
President & Director
Director → President & Director, 2024
On filings since 2020
1 hr/week
No compensation reported
Stacy Madigan
Secretary & Director
Director → Secretary & Director, 2024
On filings since 2020
1 hr/week
No compensation reported
Thomas Suniville
CFO & Director
Director → CFO & Director, 2024
On filings since 2020
1 hr/week
No compensation reported
Former officers (2)
- Former: Warren Winiarski (2020–2023) — President
- Former: Barbara Winiarski (2020) — Secretary & Treasurer
Data from IRS Form 990 filings, 2020–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about Winiarski Family Foundation
How much does Winiarski Family Foundation give each year?
Winiarski Family Foundation gave $43.1M across 3 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $14.2M across 6 grants.
What is Winiarski Family Foundation's typical grant size?
Winiarski Family Foundation's median grant in 2025 was $3,121,614, and its average grant was $14,355,900, across 3 grants on its 2025 IRS Form 990-PF.
Where does Winiarski Family Foundation give grants?
Winiarski Family Foundation gives mostly in New Mexico: 87% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest states were District of Columbia (7%) and California (6%).
Does Winiarski Family Foundation give general operating support?
Not in 2025: none of the 3 grants with a stated purpose on Winiarski Family Foundation's 2025 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Financial Support for the Organization" (3 grants).
How large is Winiarski Family Foundation?
Winiarski Family Foundation reported $1.7M in total assets on its 2025 IRS Form 990-PF. It paid out $43.1M in qualifying distributions that year, against a required minimum of $84K (roughly 5% of its investment assets).
What does Winiarski Family Foundation fund?
No mission statement for the foundation is provided. Its website reports support for conservation and preservation efforts, and describes specific projects involving wine writing, viticulture, and climate research. See mission & focus areas ↑
How do I apply for a grant from Winiarski Family Foundation?
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Winiarski Family Foundation's EIN?
Winiarski Family Foundation's EIN (Employer Identification Number) is 26-0474242. IRS Form 990 filing data is available on this page for 2020–2025.
Does Winiarski Family Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated September 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS May 17, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 12, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 12, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS November 7, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS October 30, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 12, 2026)
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