Cromwell Harbor Supporting Foundation
To operate exclusively for educational, charitable and scientific purposes within the meaning of section 501(c)(3) of the internal revenue code as a section 509(a)(3) supporting organization of the boston foundation.
Key facts about Cromwell Harbor Supporting Foundation
In short: Cromwell Harbor Supporting Foundation gave $1.4M across 18 grants in 2025 (avg $79K), top state Massachusetts. 28% of 2025 grantees were new. Source: 2025 IRS Form 990.
- EIN
- 87-3060445
- Latest 990 filing
- Form 990, 2025
- Annual giving (2025)
- $1,426,667
- Grants made (2025)
- 18
- Average grant
- $79,259
- Median grant
- $37,500
- New grantees (estimate)
- 28% first-time grantees (5 of 18, 2025)
- Total assets
- $66,002,435
- Primary geography
- Massachusetts (46% of itemized 2025 grant dollars)
Data from IRS Form 990, 2025; updated September 2026. New grantees are estimated by matching recipient names across years (methodology).
Financial Overview
From 2025 IRS Form 990 · View filing
Total Assets
$66.0M
+47.4% YoY
Annual Giving
$1.4M
-39.5% YoY
Grant Count
18
+12.5% YoY
Avg Grant Size
$79K
-46.2% YoY
Is Cromwell Harbor Supporting Foundation open to new grantees?
28%
first-time grantees, 2025
In 2025, 5 of 18 grantees (28%) were first-time recipients. First grants averaged $44K; repeat grants $93K. How we count
Medians: $50K first-time, $25K repeat.
Estimate from itemized grant lists in IRS Form 990 filings (2022–2025). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
About Cromwell Harbor Supporting Foundation
Based on IRS filings
Cromwell Harbor Supporting Foundation is a nonprofit organization focused on Philanthropy, Voluntarism & Grantmaking, based in Boston, MA. IRS filing data is available from 2022 through 2025. As of 2025, the organization holds $66.0M in total assets. In 2025, it awarded 18 grants totaling $1.4M. Net investment income was $3.2M.
Focus Areas
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of all 18 itemized 2025 grant dollars.
Cities
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
52 grants across all recorded years
Giving History
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| COLLEGE OF THE ATLANTIC Bar Harbor, ME | GENERAL SUPPORT | $420,000 |
| MASSACHUSETTS GENERAL HOSPITAL Boston, MA | SPECIAL PROJECT | $200,000 |
| VITAL CXNS INC West Roxbury, MA | GENERAL SUPPORT | $176,667 |
| NORTH BENNET STREET SCHOOL Boston, MA | GENERAL SUPPORT | $125,000 |
| AUTHOR'S GUILD FOUNDATION New York City, NY | GENERAL SUPPORT | $100,000 |
| LAWRENCE CATHOLIC ACADEMY Lawrence, MA | GENERAL SUPPORT | $100,000 |
| JESUP MEMORIAL LIBRARY Bar Harbor, ME | GENERAL SUPPORT | $50,000 |
| OUTER COAST Sitka, AK | GENERAL SUPPORT | $50,000 |
| PICKLES GROUP INC Winnetka, IL | GENERAL SUPPORT | $50,000 |
| CHILDREN'S TUMOR FOUNDATION New York City, NY | GENERAL SUPPORT | $25,000 |
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $66,002,435 | $44,770,130 | $42,497,529 |
| Revenue | $7,597,711 | $4,989,841 | $19,072,513 |
| Expenses | $1,713,492 | $2,444,857 | $393,866 |
| Qualifying Distributions | — | — | — |
| Net Investment Income | $3,173,439 | $473,958 | $2,812,452 |
| Distributable Amount | — | — | — |
Data update history
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2022 (received by the IRS May 15, 2023)
- Updated Form 990 for fiscal year 2023 (received by the IRS May 15, 2024)
- Updated Form 990 for fiscal year 2024 (received by the IRS March 13, 2025)
- Added Form 990 for fiscal year 2025 (received by the IRS May 15, 2026)
Leadership & Key People
Officers and directors from IRS filings
Cromwell Harbor Supporting Foundation is led by William N. Thorndike Jr., President, Treasurer & CIO since 2024 (on filings since 2022); none of the 5 officers listed in 2025 report compensation.
Officers on the 2025 filing
William N. Thorndike Jr.
President, Treasurer & CIO
President, Treasurer & CIO → President, Treasurer & C, 2023
President, Treasurer & C → President, Treasurer & CIO, 2024
On filings since 2022
1 hr/week
No compensation reported
Charles Cheever
Director
On filings since 2022
1 hr/week
No compensation reported
M. Lee Pelton
Director
On filings since 2022
1 hr/week
No compensation reported
Thomas Bird
Director
On filings since 2022
1 hr/week
No compensation reported
Geneva S. Thorndike
Clerk
On filings since 2022
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2022–2025. "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 Cromwell Harbor Supporting Foundation
How much does Cromwell Harbor Supporting Foundation give each year?
Cromwell Harbor Supporting Foundation gave $1.4M across 18 grants in 2025, according to its 2025 IRS Form 990. In 2024 it gave $2.4M across 16 grants.
What is Cromwell Harbor Supporting Foundation's typical grant size?
Cromwell Harbor Supporting Foundation's median grant in 2025 was $37,500, and its average grant was $79,259, across 18 grants on its 2025 IRS Form 990. Organizations receiving their first grant from Cromwell Harbor Supporting Foundation that year got $44K on average.
Where does Cromwell Harbor Supporting Foundation give grants?
Cromwell Harbor Supporting Foundation's top state is Massachusetts, with 46% of the grant dollars itemized on its 2025 IRS Form 990. The next largest states were Maine (37%) and New York (9%). The most frequent recipient cities were Bar Harbor, ME (4 grants), Boston, MA (4 grants) and New York City, NY (2 grants).
Does Cromwell Harbor Supporting Foundation give general operating support?
Yes: 83% of Cromwell Harbor Supporting Foundation's 2025 grants with a stated purpose (15 of 18) were for general or operating support, per its 2025 IRS Form 990. Recurring purposes include "Special Project" (3 grants).
Who are Cromwell Harbor Supporting Foundation's largest grantees?
Cromwell Harbor Supporting Foundation's largest 2025 grantees include College of the Atlantic ($420,000), Massachusetts General Hospital ($200,000) and Vital CXNS Inc ($176,667), according to its 2025 IRS Form 990. Together they received 56% of its itemized 2025 grant dollars.
How large is Cromwell Harbor Supporting Foundation?
Cromwell Harbor Supporting Foundation reported $66.0M in total assets on its 2025 IRS Form 990. Its revenue that year was $7.6M.
What is Cromwell Harbor Supporting Foundation?
Cromwell Harbor Supporting Foundation is a nonprofit organization focused on Philanthropy, Voluntarism & Grantmaking, based in Boston, MA. It holds $66.0M in total assets as of 2025.
What is Cromwell Harbor Supporting Foundation's EIN?
Cromwell Harbor Supporting Foundation's EIN (Employer Identification Number) is 87-3060445. IRS Form 990 filing data is available on this page for 2022–2025.
Data last updated September 2026. Sourced from IRS Form 990 filings.
Here's the math on researching Cromwell Harbor Supporting Foundation by hand.
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