The Diomedes Foundation
The Diomedes Foundation is a private foundation based in Concord, Massachusetts. Its 2025 filing reports 18 grants totaling $2,257,290, with grants to organizations in several states.
The Diomedes Foundation at a glance
In short: The Diomedes Foundation gave $2.3M across 18 grants in 2025 (avg $125K), mostly in Ohio. 33% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $2,257,290
- +526.2% vs 2024
- Grants made (2025)
- 18
- +28.6% vs 2024
- Average grant
- $125,405
- +387.0% vs 2024
- Median grant
- $15,000
- Total assets
- $941,204
- -55.3% vs 2024
- New grantees (estimate)
- 33% first-time grantees (6 of 18, 2025; small sample)
- Primary geography
- Ohio (67% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to The Diomedes Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation does not accept unsolicited requests for funds and states that it makes contributions only to preselected charitable organizations.
- Contact
Mailing address: 33 Bradford Street, Concord, MA 01742
Phone: (978) 254-6264
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who The Diomedes Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Boynton Fmaily Fund - Fidelity Charitable ($1.5M). Together the top 10 received $2.2M.
Grant Size Distribution
77 grants across all recorded years
The most common grant size was under $50K: 61 grants of 77 (79%).
Geographic Focus
Where this funder awards grants
In 2025, grant dollars went primarily to recipients in Ohio (67%) and Massachusetts (27%). The remaining reported shares were Indiana (2%), Maine (2%), and California (1%). Named 2025 recipients also included organizations in New York and New Hampshire.
Grant Distribution by State
Share of 2025 grant dollars across all 18 itemized grants.
Cities
Is The Diomedes Foundation open to new grantees?
33%
first-time grantees, 2025
In 2025, 6 of 18 grantees (33%) were first-time recipients. With only 18 grantees, that is a small sample: one grantee more or less moves the share by about 6 points. First grants averaged $270K; repeat grants $53K. How we count
Medians: $18K first-time, $15K repeat.
- 39% of 2025 grantees were also funded in 2024. Method
- Giving grew 608% from 2022 to 2025. Method
- In 2025 it paid out well above its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2025). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2025, annual grant giving ranged from $227K (2020) to $2.3M (2025). In 2025 it made 18 grants totaling $2.3M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Boynton Fmaily Fund - Fidelity Charitable Cincinnati, OH | To Fund the Recipient's Operating Budget | $1,517,986 |
| Harvard University Cambridge, MA | To Fund the Recipient's Operating Budget | $292,000 |
| Emerson Health Concord, MA | To Fund the Recipient's Operating Budget | $130,350 |
| Middlesex School Concord, MA | To Fund the Recipient's Operating Budget | $95,000 |
| Renaissance Charitable Foundation Inc - Theodora Park Fund Indianapolis, IN | To Fund the Recipient's Operating Budget | $50,000 |
| Concord Carlisle Foundation Concord, MA | To Fund the Recipient's Operating Budget | $26,100 |
| Island Housing Trust Mount Desert, ME | To Fund the Recipient's Operating Budget | $25,000 |
| California Community Foundation Los Angeles, CA | To Fund the Recipient's Operating Budget | $22,500 |
| Mount Desert Nursing Association Northeast Harbor, ME | To Fund the Recipient's Operating Budget | $15,000 |
| The Umbrella Arts Center Concord, MA | To Fund the Recipient's Operating Budget | $15,000 |
Ready to take the next step with The Diomedes Foundation?
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 | $941,204 | $191,959 | $2,268,981 | $2,257,290 | 18 | $2,257,290 | $186,837 | $112,653 |
| 2024 | $2,105,097 | $327,702 | $366,569 | $360,500 | 14 | $364,835 | $326,169 | $138,412 |
| 2023 | $2,144,269 | $175,553 | $373,865 | $367,500 | 13 | $371,535 | $173,223 | $139,621 |
| 2022 | $2,342,202 | $71,727 | $333,862 | $318,985 | 11 | $322,660 | $70,225 | $155,025 |
| 2021 | $2,608,263 | $371,632 | $504,335 | $498,375 | 21 | $498,375 | $365,672 | $185,906 |
| 2020 | $2,740,966 | $-125,750 | $235,449 | $226,932 | 15 | — | $51,001 | $169,658 |
Under IRS private-foundation payout rules, The Diomedes Foundation reported a distributable amount of $113K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2025 grants included support for schools, a health organization, housing and community organizations, a library-related corporation, and other recipients. For example, Middlesex School describes its mission as helping students find their promise through rigorous intellectual, physical, creative, and ethical education. Island Housing Trust says it promotes viable, year-round island communities by advancing permanent workforce housing on Mount Desert Island, Maine. These are the grantees’ descriptions of their own missions.
Grantmaking
In filing year 2025, the foundation made 18 grants totaling $2,257,290. Grant amounts ranged from $2,000 to $1,517,986, with a median grant of $15,000. The largest reported grants included $1,517,986 to Boynton Family Fund - Fidelity Charitable; $292,000 to Harvard University; $130,350 to Emerson Health; and $95,000 to Middlesex School. The filing lists each of these grants’ purpose as funding the recipient’s operating budget.
Other 2025 recipients included Concord Carlisle Foundation ($26,100), Island Housing Trust ($25,000), California Community Foundation ($22,500), Mount Desert Nursing Association ($15,000), The Umbrella Arts Center ($15,000), The Trustees of Hamilton College ($13,000), and Ubuntu Global Connections ($10,000). St. Paul’s School received $10,000, and Concord Free Public Library Corporation received $8,354.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists John W Boynton IV, Johnanna N Boynton, and James E Gowen II as trustees.
The Diomedes Foundation's 2025 filing lists 3 officers; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
James E. Gowen II
Trustee
On filings since 2020
1 hr/week
No compensation reported
John W. Boynton IV
Trustee
On filings since 2020
1 hr/week
No compensation reported
Johnanna N. Boynton
Trustee
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 Diomedes Foundation
How much does The Diomedes Foundation give each year?
The Diomedes Foundation gave $2.3M across 18 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $361K across 14 grants.
What is The Diomedes Foundation's typical grant size?
The Diomedes Foundation's median grant in 2025 was $15,000, and its average grant was $125,405, across 18 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from The Diomedes Foundation that year got $270K on average.
Where does The Diomedes Foundation give grants?
The Diomedes Foundation gives mostly in Ohio: 67% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was Massachusetts (27%). The most frequent recipient cities were Concord, MA (9 grants) and Northeast Harbor, ME (2 grants).
Does The Diomedes Foundation give general operating support?
Yes: 100% of The Diomedes Foundation's 2025 grants with a stated purpose (18 of 18) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are The Diomedes Foundation's largest grantees?
The Diomedes Foundation's largest 2025 grantees include Boynton Fmaily Fund - Fidelity Charitable ($1,517,986), Harvard University ($292,000) and Emerson Health ($130,350), according to its 2025 IRS Form 990-PF. Together they received 86% of its itemized 2025 grant dollars.
How large is The Diomedes Foundation?
The Diomedes Foundation reported $941K in total assets on its 2025 IRS Form 990-PF. It paid out $2.3M in qualifying distributions that year, against a required minimum of $113K (roughly 5% of its investment assets).
What does The Diomedes Foundation fund?
No mission statement for the foundation is provided. Its 2025 grants included support for schools, a health organization, housing and community organizations, a library-related corporation, and other recipients. See mission & focus areas ↑
How do I apply for a grant from The Diomedes Foundation?
The foundation does not accept unsolicited requests for funds and states that it makes contributions only to preselected charitable organizations. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is The Diomedes Foundation's EIN?
The Diomedes Foundation's EIN (Employer Identification Number) is 46-1451480. IRS Form 990 filing data is available on this page for 2020–2025.
Does The Diomedes Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
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 May 13, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 27, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 15, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS March 13, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS March 3, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 12, 2026)
- IRS filings on file for fiscal years 2020–2024
Explore Open Grants
Browse active grant opportunities in The Diomedes Foundation's focus areas in our free grants database
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Cite this profile
Grantable. (2026). The Diomedes Foundation funder profile. GrantGraph. Retrieved October 14, 2026, from https://grantable.co/funders/the-diomedes-foundation-morg_c27dd62d29894d8685b9e1ce4b3f37ae
BibTeX
@misc{grantable_461451480_2026,
author = {{Grantable}},
title = {{The Diomedes Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/the-diomedes-foundation-morg_c27dd62d29894d8685b9e1ce4b3f37ae},
note = {Accessed 2026-10-14. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from The Diomedes Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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