Cromwell Harbor Supporting Foundation Inc

Public charity · Grantmaker Boston, MA EIN: 87-3060445

Cromwell Harbor Supporting Foundation is a public charity based in Boston, Massachusetts. Formed in 2021, it states that it operates for educational, charitable, and scientific purposes as a supporting organization of the Boston Foundation.

Key facts about Cromwell Harbor Supporting Foundation Inc

In short: Cromwell Harbor Supporting Foundation Inc 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 Inc 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.

  • 61% of 2025 grantees were also funded in 2024. Method
  • Giving grew 296% from 2022 to 2025. Method

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.

Research compiled by Grantable AI from public sources. Last updated September 2026.

Mission & Focus Areas

The foundation’s stated mission is to operate exclusively for educational, charitable, and scientific purposes under Section 501(c)(3) of the Internal Revenue Code as a Section 509(a)(3) supporting organization of the Boston Foundation.

Its grants include support for organizations with varied missions. For example, College of the Atlantic describes its work as operating a four-year accredited college, a small graduate program, and other summer education programs. North Bennet Street School says it trains students for careers in traditional trades, preserves and advances craft traditions, and promotes appreciation of craftsmanship. Vital CXNS says it partners with communities to advance a more accessible, effective, and equitable health ecosystem. Mount Desert Land and Garden Preserve describes its mission as conserving and sharing the beauty of its historic lands and gardens.

Grantmaking

In 2025, the foundation reported 18 grants totaling $1,426,667. Grants ranged from $10,000 to $420,000, with a median grant of $37,500.

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Geographic Focus

Where this funder awards grants

The foundation’s 2025 grant dollars went to recipients in Massachusetts (46%), Maine (37%), New York (9%), Alaska (4%), and Illinois (4%).

Grant Distribution by State

7states

Share of 2025 grant dollars across all 18 itemized grants.

Cities

BostonBar HarborNew York CityAlpharettaNew YorkSeal HarborWest RoxburyCambridgeChapel HillEllsworthCaribouGrotonLawrenceSitkaWinnetka

Giving Over Time

Total grant dollars and number of grants per year

$0$1M$2M$3M8 grants2022 10 grants2023 16 grants2024 18 grants2025

From 2022 to 2025, annual grant giving ranged from $360K (2022) to $2.4M (2024). In 2025 it made 18 grants totaling $1.4M.

Grant Insights

How this funder distributes its grants

Top Recipients

Top 10 recipients in 2025

College of the Atlantic: $420KCollege of the Atlantic$420KMassachusetts General Hospital: $200KMassachusetts General Hospital$200KVital CXNS Inc: $177KVital CXNS Inc$177KNorth Bennet Street School: $125KNorth Bennet Street School$125KAuthor's Guild Foundation: $100KAuthor's Guild Foundation$100KLawrence Catholic Academy: $100KLawrence Catholic Academy$100KJesup Memorial Library: $50KJesup Memorial Library$50KOuter Coast: $50KOuter Coast$50KPickles Group Inc: $50KPickles Group Inc$50KChildren's Tumor Foundation: $25KChildren's Tumor Foundation$25K

The largest 2025 recipient was College of the Atlantic ($420K). Together the top 10 received $1.3M.

Grant Size Distribution

52 grants across all recorded years

31<$50K7$50–100K10$100–250K3$250–500K$500K–1M1$1–5M$5M+

The most common grant size was under $50K: 31 grants of 52 (60%).

Giving History

Grant recipients and amounts by year

RecipientPurposeAmount
College of the Atlantic Bar Harbor, MEGeneral Support$420,000
Massachusetts General Hospital Boston, MASpecial Project$200,000
Vital CXNS Inc West Roxbury, MAGeneral Support$176,667
North Bennet Street School Boston, MAGeneral Support$125,000
Author's Guild Foundation New York City, NYGeneral Support$100,000
Lawrence Catholic Academy Lawrence, MAGeneral Support$100,000
Jesup Memorial Library Bar Harbor, MEGeneral Support$50,000
Outer Coast Sitka, AKGeneral Support$50,000
Pickles Group Inc Winnetka, ILGeneral Support$50,000
Children's Tumor Foundation New York City, NYGeneral Support$25,000

Financial History

Multi-year comparison from IRS filings

Filing year Assets Revenue Expenses Grants
2025 $66,002,435 $7,597,711 $1,713,492 $1,426,667
2024 $44,770,130 $4,989,841 $2,444,857 $2,358,667
2023 $42,497,529 $19,072,513 $393,866 $366,667
Revenue
Expenses
Net Investment Income
$0$10M$20M$30M2022 2023 2024 2025
Metric202520242023
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
Net Investment Income$3,173,439$473,958$2,812,452

Data update history

When this profile's IRS filing data changed on Grantable

  1. Updated Form 990 for fiscal year 2022 (received by the IRS May 15, 2023)
  2. Updated Form 990 for fiscal year 2023 (received by the IRS May 15, 2024)
  3. Updated Form 990 for fiscal year 2024 (received by the IRS March 13, 2025)
  4. Added Form 990 for fiscal year 2025 (received by the IRS May 15, 2026)

Leadership & Key People

Leadership team and compensation from IRS filings

The 2025 filing lists William N. Thorndike Jr. as president, treasurer, and CIO; Geneva S. Thorndike as clerk; and M. Lee Pelton, Thomas Bird, and Charles Cheever as directors.

Cromwell Harbor Supporting Foundation Inc 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.

Contact

Mailing address: Co Choate 2 International Place, Boston, MA 02110
Phone: (617) 248-5000

Frequently asked questions about Cromwell Harbor Supporting Foundation Inc

How much does Cromwell Harbor Supporting Foundation Inc give each year?

Cromwell Harbor Supporting Foundation Inc 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 Inc's typical grant size?

Cromwell Harbor Supporting Foundation Inc'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 Inc that year got $44K on average.

Where does Cromwell Harbor Supporting Foundation Inc give grants?

Cromwell Harbor Supporting Foundation Inc'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 Inc give general operating support?

Yes: 83% of Cromwell Harbor Supporting Foundation Inc'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 Inc's largest grantees?

Cromwell Harbor Supporting Foundation Inc'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 Inc?

Cromwell Harbor Supporting Foundation Inc reported $66.0M in total assets on its 2025 IRS Form 990. Its revenue that year was $7.6M.

What does Cromwell Harbor Supporting Foundation Inc fund?

The foundation’s stated mission is to operate exclusively for educational, charitable, and scientific purposes under Section 501(c)(3) of the Internal Revenue Code as a Section 509(a)(3) supporting organization of the Boston Foundation. See mission & focus areas ↑

How do I apply for a grant from Cromwell Harbor Supporting Foundation Inc?

Cromwell Harbor Supporting Foundation Inc has no public application process in the sources Grantable reviewed. Contact the foundation directly before submitting a request.

What is Cromwell Harbor Supporting Foundation Inc's EIN?

Cromwell Harbor Supporting Foundation Inc'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. Research dossier generated September 2026.

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