Ariowitsch Family Foundation
Ariowitsch Family Foundation is a private foundation, based in Mill Valley, CA. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $404K in total assets. In 2025, it awarded 16 grants totaling $60K. Net investment income was $25K.
Key facts about Ariowitsch Family Foundation
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.
- EIN
- 13-6279580
- Latest 990 filing
- Form 990-PF, 2025
- Annual giving (2025)
- $60,000
- Grants made (2025)
- 16
- Average grant
- $3,750
- Median grant
- $1,500
- New grantees (estimate)
- 19% first-time grantees (3 of 16, 2025)
- Total assets
- $404,016
- Primary geography
- California (80% of itemized 2025 grant dollars)
Data from IRS Form 990-PF, 2025; updated September 2026. New grantees are estimated by matching recipient names across years (methodology).
Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$404K
-8.1% YoY
Annual Giving
$60K
+11.1% YoY
Grant Count
16
+6.7% YoY
Avg Grant Size
$4K
+4.2% YoY
Is Ariowitsch Family Foundation open to new grantees?
19%
first-time grantees, 2025
In 2025, 3 of 16 grantees (19%) were first-time recipients. 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.
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of all 16 itemized 2025 grant dollars.
Cities
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.
Grant Insights
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%).
Giving History
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 |
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $404,016 | $439,390 | $477,483 |
| Revenue | $28,145 | $20,563 | $58,077 |
| Expenses | $63,519 | $58,656 | $51,220 |
| Qualifying Distributions | $60,000 | $54,000 | $50,000 |
| Net Investment Income | $24,626 | $15,907 | $56,857 |
| Distributable Amount | — | — | — |
Data update history
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
Leadership & Key People
Officers and directors from IRS filings
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 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.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Here's the math on researching Ariowitsch Family Foundation by hand.
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