Ariowitsch Family Foundation
The Ariowitsch Family Foundation is a private foundation based in Mill Valley, California. Its 2025 filing reports grants to organizations working in areas including conservation, education, arts education, and scholarships.
Ariowitsch Family Foundation at a glance
In short: Ariowitsch Family Foundation gave $60K across 16 grants in 2025 (avg $4K), mostly in California. 19% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $60,000
- +11.1% vs 2024
- Grants made (2025)
- 16
- +6.7% vs 2024
- Average grant
- $3,750
- +4.2% vs 2024
- Median grant
- $1,500
- Total assets
- $404,016
- -8.1% vs 2024
- New grantees (estimate)
- 19% first-time grantees (3 of 16, 2025; small sample)
- Primary geography
- California (80% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to Ariowitsch Family Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation states that it makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: 150 Marlin Avenue, Mill Valley, CA 94941
Phone: (415) 999-3845
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Ariowitsch Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was The Nature Conservancy ($30K). Together the top 10 received $56K.
Grant Size Distribution
57 grants across all recorded years
The most common grant size was under $50K: 57 grants of 57 (100%).
Geographic Focus
Where this funder awards grants
In 2025, 80% of grant dollars went to recipients in California, 8% to New York, 5% to Colorado, 2% to Massachusetts, and 2% to Montana.
Grant Distribution by State
Share of 2025 grant dollars across all 16 itemized grants.
Cities
Is Ariowitsch Family Foundation open to new grantees?
19%
first-time grantees, 2025
In 2025, 3 of 16 grantees (19%) were first-time recipients. With only 16 grantees, that is a small sample: one grantee more or less moves the share by about 6 points. First grants averaged $1K; repeat grants $4K. How we count
Medians: $1K first-time, $2K repeat.
- 81% of 2025 grantees were also funded in 2024. Method
- Giving grew 33% from 2022 to 2025. Method
- In 2021 it paid out 110% of its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2025). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2025, annual grant giving ranged from $45K (2022) to $60K (2025). In 2025 it made 16 grants totaling $60K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| The Nature Conservancy San Francisco, CA | Conservation | $30,000 |
| American Friends of the Hebrew Univ New York City, NY | Scholarship | $5,000 |
| Marin Mountessori School Corte Madera, CA | Education | $5,000 |
| Headlands Center for Arts Sausalito, CA | Education | $5,000 |
| The Community Foundation Boulder, CO | Arts Education, Environment, Humanitarian | $3,000 |
| Uc Berkeley Foundation Berkeley, CA | Education | $2,000 |
| Union of Concerned Scientists Cambridge, MA | Education | $1,500 |
| Environmental Defense Fund San Francisco, CA | Environmental | $1,500 |
| Yellowstone to Yukon Bozeman, MT | Education | $1,500 |
| Washington University St. Louis, MO | Education | $1,000 |
Ready to take the next step with Ariowitsch Family Foundation?
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 | $404,016 | $28,145 | $63,519 | $60,000 | 16 | $60,000 | $24,626 | — |
| 2024 | $439,390 | $20,563 | $58,656 | $54,000 | 15 | $54,000 | $15,907 | — |
| 2023 | $477,483 | $58,077 | $51,220 | $50,000 | 8 | $50,000 | $56,857 | — |
| 2022 | $470,626 | $55,241 | $46,601 | $45,000 | 8 | $56,000 | $53,640 | — |
| 2021 | $461,986 | $70,063 | $58,496 | $56,000 | 10 | $56,000 | $67,567 | $50,965 |
| 2020 | $450,419 | $54,825 | $52,501 | $50,000 | 9 | — | $52,324 | $45,925 |
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
The foundation’s own mission is not stated in the available information. Its grants show support for conservation and environmental organizations, educational institutions, arts education, scholarships, and humanitarian purposes. For example, Yellowstone to Yukon Conservation Initiative describes its work as connecting and protecting habitat from Yellowstone to the Yukon so people and nature can thrive. Island Conservation says it works to prevent extinctions by removing invasive species from islands, while Rainforest Action Network describes work to protect community rights, forests, climate stability, and biodiversity. These are the grantees’ descriptions of their own missions.
Grantmaking
In 2025, the foundation reported 16 grants totaling $60,000. Grant amounts ranged from $500 to $30,000, with a median of $1,500. The largest awards included $30,000 to The Nature Conservancy for conservation; $5,000 each to American Friends of the Hebrew University for scholarships, Marin Montessori School for education, and Headlands Center for Arts for education; and $3,000 to The Community Foundation for arts education, environment, and humanitarian purposes. Other reported grants included $2,000 to UC Berkeley Foundation and $1,500 each to Union of Concerned Scientists, Environmental Defense Fund, and Yellowstone to Yukon.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Tim Ariowitsch as President & CEO, Tanya Ariowitsch as Vice President, Melinda Ariowitsch as Treasurer, and Ethan Ariowitsch as Secretary.
Ariowitsch Family Foundation is led by Tim Ariowitsch, President & CEO on every filing since 2020; none of the 4 officers listed in 2025 report compensation.
Officers on the 2025 filing
Tim Ariowitsch
President & CEO
On filings since 2020
1 hr/week
No compensation reported
Ethan Ariowitsch
Secretary
On filings since 2021
1 hr/week
No compensation reported
Melinda Ariowitsch
Treasurer
On filings since 2021
1 hr/week
No compensation reported
Tanya Ariowitsch
Vice President
On filings since 2021
1 hr/week
No compensation reported
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 Ariowitsch Family Foundation
How much does Ariowitsch Family Foundation give each year?
Ariowitsch Family Foundation gave $60K across 16 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $54K across 15 grants.
What is Ariowitsch Family Foundation's typical grant size?
Ariowitsch Family Foundation's median grant in 2025 was $1,500, and its average grant was $3,750, across 16 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from Ariowitsch Family Foundation that year got $1K on average.
Where does Ariowitsch Family Foundation give grants?
Ariowitsch Family Foundation gives mostly in California: 80% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest states were New York (8%) and Colorado (5%). The most frequent recipient cities were San Francisco, CA (5 grants).
Does Ariowitsch Family Foundation give general operating support?
Not in 2025: none of the 16 grants with a stated purpose on Ariowitsch Family Foundation's 2025 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Education" (7 grants) and "Environmental" (4 grants).
Who are Ariowitsch Family Foundation's largest grantees?
Ariowitsch Family Foundation's largest 2025 grantees include The Nature Conservancy ($30,000), American Friends of the Hebrew Univ ($5,000) and Marin Mountessori School ($5,000), according to its 2025 IRS Form 990-PF. Together they received 67% of its itemized 2025 grant dollars.
How large is Ariowitsch Family Foundation?
Ariowitsch Family Foundation reported $404K in total assets on its 2025 IRS Form 990-PF. Its revenue that year was $28K.
What does Ariowitsch Family Foundation fund?
The foundation’s own mission is not stated in the available information. Its grants show support for conservation and environmental organizations, educational institutions, arts education, scholarships, and humanitarian purposes. See mission & focus areas ↑
How do I apply for a grant from Ariowitsch Family Foundation?
The foundation states that it 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 Ariowitsch Family Foundation's EIN?
Ariowitsch Family Foundation's EIN (Employer Identification Number) is 13-6279580. IRS Form 990 filing data is available on this page for 2020–2025.
Does Ariowitsch Family Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(2)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 18, 2026)
- IRS filings on file for fiscal years 2020–2024
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Cite this profile
Grantable. (2026). Ariowitsch Family Foundation funder profile. GrantGraph. Retrieved October 19, 2026, from https://grantable.co/funders/ariowitsch-family-foundation-morg_455840a20ab24a449d75f1a3a72c6c17
BibTeX
@misc{grantable_136279580_2026,
author = {{Grantable}},
title = {{Ariowitsch Family Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/ariowitsch-family-foundation-morg_455840a20ab24a449d75f1a3a72c6c17},
note = {Accessed 2026-10-19. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from Ariowitsch Family Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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