Diffenbaugh Foundation
Diffenbaugh Foundation is a private foundation, based in Stanford, CA. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $296K in total assets. In 2025, it awarded 5 grants totaling $13K. Net investment income was $48K.
Diffenbaugh Foundation at a glance
In short: Diffenbaugh Foundation gave $13K across 5 grants in 2025 (avg $3K), mostly in California. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $13,000
- +62.5% vs 2024
- Grants made (2025)
- 5
- +25.0% vs 2024
- Average grant
- $2,600
- +30.0% vs 2024
- Median grant
- $2,000
- Total assets
- $295,841
- +11.7% vs 2024
- Primary geography
- California (100% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
Who Diffenbaugh Foundation funds
How this funder distributes its grants
Top Recipients
Top 5 recipients in 2025
The largest 2025 recipient was Vermillion Sea Institute ($7K). Together the top 5 received $13K.
Grant Size Distribution
26 grants across all recorded years
The most common grant size was under $50K: 26 grants of 26 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 5 itemized grants.
States
Cities
How Diffenbaugh Foundation gives
- Giving held roughly steady from 2022 to 2025 (−13%). Method
- In 2025 it paid out 75% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. 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 $8K (2023) to $15K (2022). In 2025 it made 5 grants totaling $13K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Vermillion Sea Institute Bonita, CA | General | $7,000 |
| Marine Mammal Center Sausalito, CA | General | $2,000 |
| Wildman Science Learning Half Moon Bay, CA | General | $2,000 |
| The Teaching Well Oakland, CA | General | $1,500 |
| Growing Together Bay Area Pinole, CA | General | $500 |
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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 | $295,841 | $48,052 | $17,029 | $13,000 | 5 | $13,000 | $48,052 | $17,338 |
| 2024 | $264,818 | $28,831 | $12,139 | $8,000 | 4 | $8,000 | $28,831 | $15,534 |
| 2023 | $248,126 | $-14,284 | $11,447 | $8,000 | 4 | $8,000 | $2,152 | $15,433 |
| 2022 | $273,857 | $-3,222 | $19,339 | $15,000 | 7 | $15,000 | — | $19,987 |
| 2021 | $296,418 | $35,149 | $19,473 | $15,000 | 6 | $15,000 | $31,068 | $19,521 |
| 2020 | $280,742 | $17,391 | $19,004 | $15,000 | 5 | — | $13,520 | $19,801 |
Under IRS private-foundation payout rules, Diffenbaugh Foundation reported a distributable amount of $17K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Diffenbaugh Foundation is led by Ann Balliet, President on every filing since 2020; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Ann Balliet
President
On filings since 2020
No compensation reported
Flora Worley
Secretary
On filings since 2020
No compensation reported
Polly Diffenbaugh
Secretary & Treasurer
On filings since 2020
5 hrs/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 Diffenbaugh Foundation
How much does Diffenbaugh Foundation give each year?
Diffenbaugh Foundation gave $13K across 5 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $8K across 4 grants.
What is Diffenbaugh Foundation's typical grant size?
Diffenbaugh Foundation's median grant in 2025 was $2,000, and its average grant was $2,600, across 5 grants on its 2025 IRS Form 990-PF.
Where does Diffenbaugh Foundation give grants?
Diffenbaugh Foundation gives mostly in California: 100% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there.
Does Diffenbaugh Foundation give general operating support?
Yes: 100% of Diffenbaugh Foundation's 2025 grants with a stated purpose (5 of 5) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Diffenbaugh Foundation's largest grantees?
Diffenbaugh Foundation's largest 2025 grantees include Vermillion Sea Institute ($7,000), Marine Mammal Center ($2,000) and Wildman Science Learning ($2,000), according to its 2025 IRS Form 990-PF. Together they received 85% of its itemized 2025 grant dollars.
How large is Diffenbaugh Foundation?
Diffenbaugh Foundation reported $296K in total assets on its 2025 IRS Form 990-PF. It paid out $13K in qualifying distributions that year, against a required minimum of $17K (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What is Diffenbaugh Foundation's EIN?
Diffenbaugh Foundation's EIN (Employer Identification Number) is 95-6048727. 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.
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 July 27, 2026)
- IRS filings on file for fiscal years 2020–2024
Explore Open Grants
Browse active grant opportunities in Diffenbaugh Foundation's focus areas in our free grants database
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