Hamilton Family Foundation
Hamilton Family Foundation is a private foundation, based in Santa Rosa, CA. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $1.2M in total assets. In 2025, it awarded 9 grants totaling $68K. Net investment income was $54K.
Key facts about Hamilton Family Foundation
In short: Hamilton Family Foundation gave $68K across 9 grants in 2025 (avg $8K), top state California. Source: 2025 IRS Form 990-PF.
- EIN
- 20-5634026
- Latest 990 filing
- Form 990-PF, 2025
- Annual giving (2025)
- $67,500
- Grants made (2025)
- 9
- Average grant
- $7,500
- Median grant
- $7,500
- Total assets
- $1,172,687
- Primary geography
- California (41% of itemized 2025 grant dollars)
Data from IRS Form 990-PF, 2025; updated September 2026.
Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$1.2M
+3.6% YoY
Annual Giving
$68K
+12.5% YoY
Grant Count
9
+50.0% YoY
Avg Grant Size
$8K
-25.0% YoY
Under IRS private-foundation payout rules, Hamilton Family Foundation reported a distributable amount of $54K for 2025 — the minimum it must pay out in qualifying distributions.
How Hamilton Family Foundation gives
- Giving fell 32% from 2022 to 2025. Method
- In 2025 it paid out 133% of its IRS minimum distribution (the 5% rule). Method
From the foundation's IRS Form 990-PF filings. Methodology.
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 9 itemized grants.
Cities
Giving Over Time
Total grant dollars and number of grants per year
From 2021 to 2025, annual grant giving ranged from $60K (2021) to $100K (2022). In 2025 it made 9 grants totaling $68K.
Grant Insights
How this funder distributes its grants
Top Recipients
Top 9 recipients in 2025
The largest 2025 recipient was ACLU (American Civil Liberties Union) ($10K). Together the top 9 received $68K.
Grant Size Distribution
36 grants across all recorded years
The most common grant size was under $50K: 36 grants of 36 (100%).
Giving History
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| ACLU (American Civil Liberties Union) New York, NY | General Use | $10,000 |
| Music Mends Minds Los Angeles, CA | General Use | $10,000 |
| Giffords Law Center to Prevent Gun Violence San Francisco, CA | General Use | $7,500 |
| Partners for World Health Portland, ME | General Use | $7,500 |
| Planned Prenthood Fedwration of America Washington, DC | General Use | $7,500 |
| USA for Unhcr Washington, DC | General Use | $7,500 |
| World Central Kitchen Washington, DC | General Use | $7,500 |
| National Public Radio Culver City, CA | General Use | $5,000 |
| The Trevor Project West Hollywood, CA | General Use | $5,000 |
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $1,172,687 | $1,132,289 | $1,001,244 |
| Revenue | $168,209 | $74,618 | $193,707 |
| Expenses | $83,290 | $78,168 | $102,527 |
| Qualifying Distributions | $71,700 | $64,405 | $92,975 |
| Net Investment Income | $54,414 | $58,387 | $139,847 |
| Distributable Amount | $54,063 | $51,933 | $43,606 |
Data update history
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2019 (received by the IRS January 28, 2020)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS September 10, 2021)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS September 2, 2022)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS January 24, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS August 14, 2024)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS February 16, 2026)
- IRS filings on file for fiscal years 2019–2025
Leadership & Key People
Officers and directors from IRS filings
Hamilton Family Foundation is led by Susan Brin, Director, President & Exc Director on every filing since 2021; none of the 5 officers listed in 2025 report compensation.
Officers on the 2025 filing
Susan Brin
Director, President & Exc Director
On filings since 2021
0.5 hrs/week
No compensation reported
Marie Hamilton
Director, Chairperson & Secretary
Director & Chairperson → Director, Chairperson & Secretary, 2024
On filings since 2021
0.5 hrs/week
No compensation reported
Bernard Hamilton
Director
President & Director → Director, 2021
On filings since 2019
0.3 hrs/week
No compensation reported
Barbara Tamborski
Director
Director & Secretary → Director, 2024
On filings since 2021
0.3 hrs/week
No compensation reported
Mark Hamilton
Director & CFO
On filings since 2021
0.5 hrs/week
No compensation reported
Former officers (1)
- Former: Carolyn Hamilton (2019) — Secretary, CFO & Director
Data from IRS Form 990 filings, 2019–2025. "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 Hamilton Family Foundation
How much does Hamilton Family Foundation give each year?
Hamilton Family Foundation gave $68K across 9 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $60K across 6 grants.
What is Hamilton Family Foundation's typical grant size?
Hamilton Family Foundation's median grant in 2025 was $7,500, and its average grant was $7,500, across 9 grants on its 2025 IRS Form 990-PF.
Where does Hamilton Family Foundation give grants?
Hamilton Family Foundation's top state is California, with 41% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were District of Columbia (33%) and New York (15%). The most frequent recipient cities were Washington, DC (3 grants).
Does Hamilton Family Foundation give general operating support?
Yes: 100% of Hamilton Family Foundation's 2025 grants with a stated purpose (9 of 9) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Hamilton Family Foundation's largest grantees?
Hamilton Family Foundation's largest 2025 grantees include ACLU (American Civil Liberties Union) ($10,000), Music Mends Minds ($10,000) and Giffords Law Center to Prevent Gun Violence ($7,500), according to its 2025 IRS Form 990-PF. Together they received 41% of its itemized 2025 grant dollars.
How large is Hamilton Family Foundation?
Hamilton Family Foundation reported $1.2M in total assets on its 2025 IRS Form 990-PF. It paid out $72K in qualifying distributions that year, against a required minimum of $54K (roughly 5% of its investment assets).
What is Hamilton Family Foundation's EIN?
Hamilton Family Foundation's EIN (Employer Identification Number) is 20-5634026. IRS Form 990 filing data is available on this page for 2019–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Here's the math on researching Hamilton Family Foundation by hand.
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