The Preuss Family Foundation
The Preuss Family Foundation is a private foundation, based in La Jolla, CA. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $124K in total assets. In 2025, it awarded 8 grants totaling $217K. Net investment income was $272K.
The Preuss Family Foundation at a glance
In short: The Preuss Family Foundation gave $217K across 8 grants in 2025 (avg $27K), mostly in California. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $217,151
- +12.4% vs 2024
- Grants made (2025)
- 8
- +14.3% vs 2024
- Average grant
- $27,144
- -1.7% vs 2024
- Median grant
- $24,463
- Total assets
- $124,279
- +131.3% 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 The Preuss Family Foundation funds
How this funder distributes its grants
Top Recipients
Top recipient in 2025
The largest 2025 recipient was The Preuss Foundation Inc ($217K across 8 grants).
Grant Size Distribution
38 grants across all recorded years
The most common grant size was under $50K: 33 grants of 38 (87%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 8 itemized grants.
States
Cities
How The Preuss Family Foundation gives
- Giving fell 25% 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 $193K (2024) to $388K (2021). In 2025 it made 8 grants totaling $217K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $50,000 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $29,666 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $25,234 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $25,000 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $23,925 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $23,326 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $20,000 |
| The Preuss Foundation Inc La Jolla, CA | To support charitable, educational, and scientific purposes, including to promote brain tumor and medical research. | $20,000 |
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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 | $124,279 | $292,981 | $222,434 | $217,151 | 8 | $218,667 | $272,233 | $7,867 |
| 2024 | $53,732 | $206,675 | $197,209 | $193,224 | 7 | $194,712 | $196,354 | $7,768 |
| 2023 | $44,266 | $156,181 | $239,522 | $228,341 | 6 | $229,770 | $138,344 | $10,399 |
| 2022 | $127,607 | $402,165 | $296,543 | $289,513 | 8 | $290,749 | $387,917 | $8,905 |
| 2021 | $21,985 | $314,778 | $400,179 | $388,158 | 9 | $389,492 | $304,638 | $21,678 |
| 2020 | $107,386 | $430,041 | $357,203 | $348,543 | 9 | — | $391,837 | $13,234 |
Under IRS private-foundation payout rules, The Preuss Family Foundation reported a distributable amount of $8K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
The Preuss Family Foundation is led by Peter G. Preuss, President on every filing since 2020; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Peter G. Preuss
President
On filings since 2020
1 hr/week
No compensation reported
Peggy Preuss
Secretary
On filings since 2020
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 The Preuss Family Foundation
How much does The Preuss Family Foundation give each year?
The Preuss Family Foundation gave $217K across 8 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $193K across 7 grants.
What is The Preuss Family Foundation's typical grant size?
The Preuss Family Foundation's median grant in 2025 was $24,463, and its average grant was $27,144, across 8 grants on its 2025 IRS Form 990-PF.
Where does The Preuss Family Foundation give grants?
The Preuss Family Foundation gives mostly in California: 100% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were La Jolla, CA (8 grants).
Does The Preuss Family Foundation give general operating support?
Not in 2025: none of the 8 grants with a stated purpose on The Preuss Family Foundation's 2025 IRS Form 990-PF were described as general or operating support.
How large is The Preuss Family Foundation?
The Preuss Family Foundation reported $124K in total assets on its 2025 IRS Form 990-PF. It paid out $219K in qualifying distributions that year, against a required minimum of $8K (roughly 5% of its investment assets).
What is The Preuss Family Foundation's EIN?
The Preuss Family Foundation's EIN (Employer Identification Number) is 33-0229180. 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
(7)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS November 23, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 16, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 5, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS May 3, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS May 8, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS March 24, 2026)
- IRS filings on file for fiscal years 2020–2025
Explore Open Grants
Browse active grant opportunities in The Preuss Family Foundation's focus areas in our free grants database
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