The Sidman Family Foundation is a private grantmaking foundation based in Boston, Massachusetts, established in 2007. The foundation is structured as a 501(c)(3) organization and operates as a family foundation with deep historical roots in the Boston area. The foundation makes contributions exclusively to preselected charitable organizations and does not accept unsolicited proposals.
Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$7.0M
+53.4% YoY
Annual Giving
$1.4M
+41.9% YoY
Grant Count
47
+0.0% YoY
Avg Grant Size
$31K
+41.9% YoY
Mission & Focus Areas
The foundation's grantmaking interests span four primary areas:
Health and Human Services: Support for hospitals and medical institutions, including Beth Israel Deaconess Medical Center, Brigham and Women's Hospital, Massachusetts Eye and Ear Infirmary, and Children's Hospital Trust. Additional health-focused grantees include Team IMPACT, Brothers for Life, Planned Parenthood League of Massachusetts, and Fred Hutchinson Cancer Center.
Jewish Causes: Support for Jewish organizations and community initiatives.
Education and Youth Programs: Funding for educational institutions and youth-focused organizations.
Arts and Culture: Support for cultural and artistic projects.
Grantmaking
The foundation has supported 71 unique organizations. Grantmaking reaches organizations across 11 states, with the strongest concentration in Massachusetts, New York, and Florida, which account for 91% of all grants.
Grant Range
$10,000
Average Grant
$28,000 to $31,000
How to Apply
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Geographic Focus
Where this funder awards grants
The foundation primarily funds organizations in:
- Massachusetts (primary focus)
- New York
- Florida
Grantmaking extends to organizations across 11 states total.
Grant Distribution by State
States
Cities
Financial History
Multi-year comparison from IRS filings
Current Financial Position (2025):
- Total Assets: $7,035,526
- Annual Giving: $1,434,080
- Revenue: $4,001,573
- Expenses: $1,494,900
- Net Investment Income: $3,950,198
Financial History:
- 2024: Total Assets $4,587,253; Annual Giving $1,010,604
- 2023: Total Assets $5,104,054; Annual Giving $1,805,207
- 2010: Total Assets $9.1 million (showing decline over the long term to current $7 million)
The foundation is tax-deductible for donors and maintains zero liabilities.
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $7,035,526 | $4,587,253 | $5,104,054 |
| Revenue | $4,001,573 | $-235,266 | $-341,514 |
| Expenses | $1,494,900 | $1,099,594 | $1,881,608 |
| Qualifying Distributions | $1,443,524 | $1,010,604 | $1,805,207 |
| Net Investment Income | $3,950,198 | $57,250 | $44,426 |
| Distributable Amount | $387,081 | $343,274 | $410,519 |
Giving Over Time
Total grant dollars and number of grants per year
Grant Insights
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
Grant Size Distribution
230 grants across all recorded years
Giving History
Grant recipients and amounts by year
No grants recorded for .
Leadership & Key People
Leadership team and compensation from IRS filings
- Paula Sidman: President of the foundation
- Hope Sidman: Daughter of Paula; CEO of H2O Applied Technologies
- Matthew Sidman: Son of Paula; founder of hedge fund firm Three Bays Capital
- Jill McGaffigan: Principal officer (listed in recent filings)
Family Background: The foundation is steered by the Sidman family, which has strong ties to Boston spanning generations. Paula Sidman's father was the late Norman B. Leventhal, a real estate developer who significantly shaped the Boston skyline. Paula's husband, the late Edwin Sidman, joined Leventhal's company.
Compensation Overview
From 2025 IRS filing
From 2025 filing
| Name | Title | Hours | Compensation |
|---|---|---|---|
| PAULA M SIDMAN | PRES/DIR | 5 | — |
| HOPE SIDMAN | TREAS/DIR | 5 | — |
| MATHEW K SIDMAN | ASST TREAS/C | 5 | — |
Subject Areas
Focus areas based on grantmaking activity
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Similar funders by location and focus area
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Data last updated April 2026. Sourced from IRS Form 990-PF filings. Research dossier generated April 2026.
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