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The Diomedes Foundation at a glance

· Private foundation

The Diomedes Foundation

Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$2.3M
Granted FY2025still arriving
18
Grants FY2025still arriving
7
States reached
$1.5M
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0196% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.

Philanthropy$1.8MEducation$1.3MScience & Tech$709kHealth$474kRecreation & Sports$304kHousing & Shelter$145kArts & Culture$137kHuman Services$75kOther$0
02FY2025 · 18 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k3 grants · $15k
  • $10k–50k10 grants · $157k
  • $50k–250k3 grants · $275k
  • $250k+2 grants · $1.8M
$15,000
Median grant
7
States reached
$941k
Total assets
Largest grants
RecipientAmount
BOYNTON FMAILY FUND - FIDELITY CHARITABLE$1,517,986
HARVARD UNIVERSITY$292,000
EMERSON HEALTH$130,350
MIDDLESEX SCHOOL$95,000
RENAISSANCE CHARITABLE FOUNDATION INC - THEODORA PARK FUND$50,000
CONCORD CARLISLE FOUNDATION$26,100
ISLAND HOUSING TRUST$25,000
CALIFORNIA COMMUNITY FOUNDATION$22,500
THE UMBRELLA ARTS CENTER$15,000
MOUNT DESERT NURSING ASSOCIATION$15,000
THE TRUSTEES OF HAMILTON COLLEGE$13,000
UBUNTU GLOBAL CONNECTIONS$10,000
ST PAUL'S SCHOOL$10,000
Individual grant recipient$10,000
Individual grant recipient$10,000
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Its human-services grants (FY20–24, $65k) land where the poverty rate runs at 8%, against an area that typically sits at 11%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 11%HOUSEHOLD GOODS INC: $15k → 8%THE CHILDRENS ROOM: $10k → 8%THE CHILDRENS ROOM: $10k → 8%THE CHILDRENS ROOM: $10k → 8%THE CHILDRENS ROOM: $10k → 8%THE CHILDRENS ROOM: $10k → 8%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.

Which US states its grants reach

ME
NH
NY
MA
IN
OH
CA
CO
DC
FL
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

46%of every dollar goes to organizations it has funded before.
$1.8M · 29 repeat orgs$2.2M to everyone else

Grantees it renews have grown median revenue +90% since the first grant, against +51% for those funded once.

29 repeat relationships: 9 still active in FY2025, 20 since wound down; 5 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

29
25

Total granted

$1.8M
$515k

Median revenue growth · since first grant

+90%
+51%

Still filing today

76%
56%

New vs renewed · share of each year

In FY2025, 11% of grant dollars renewed an existing relationship; $1.7M went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’17’18’19’20’21’22’23’24’25
EducationArts & CultureHealthRecreation & SportsHousing & ShelterPhilanthropyOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). The earliest year is left-censored: relationships that predate the data read as new. Theme is the grantee’s IRS cause.

Backed again, and grew

  • CF
    CONCORD FREE PUBLIC LIBRARY CORPORATION
    5× · 2017–2025 · $381k · revenue +48%
  • AC
    AMHERST COLLEGE TRUSTEES
    2× · 2017–2018 · $312k · revenue +141%
  • MIDDLESEX SCHOOL
    6× · 2019–2025 · $232k · revenue +13%

Funded once

  • EH
    EMERSON HEALTH FOUNDATION
    one grant, 2024 · $115k
  • HC
    HARVARD COLLEGE FUND
    one grant, 2023 · $100k
  • TP
    THEODORA PARK FOUNDATION CO CARLOS BYRNE BNY MELLON CHARITABLE GIFT FUND
    one grant, 2021 · $100k
How this is measured

Repeat means funded in two or more distinct years. Growth and survival are read from each grantee’s own subsequent IRS filings.

04Its field

Closest unfunded matches

The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.

1
Northeast College of Health Sciences

Northeast college of health sciences (the college) is committed to academic excellence, leadership, and professional best practices in the health sciences.

Education
2
University of New Haven

The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…

Education
3
Boston Architectural College

The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.

—
4
Saint Anselm College

Saint anselm is a catholic, benedictine college providing all of its students a distinctive liberal arts education that incorporates opportunities for professional and career preparation. it does so in a learning community that encourages…

Education
5
Massachusetts Higher Education Assistance Corporation

The organization's primary exempt purpose is to provide access to and conduct activities in furtherance of higher education.

—
6
Wentworth Institute of Technology Inc

Wentworth institute of technology is a nationally recognized private coeducational and residential university of higher education with a mission to empower, inspire and innovate through experiential learning with a core purpose of career…

Education
7
Massachusetts Institute of Technology

The mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.

Education
8
Harvard Conservation Trust

To preserve the unique character and natural resources of harvard.

Environment
9
President and Trustees of Bates College

Bates is a college of the liberal arts and sciences, and is a coeducational, nonsectarian, residential college with special commitments to academic rigor, and to assuring in all of its efforts the dignity of each individual, and access to…

Education
10
Dean College

Dean college is a private, residential new england college grounded in a culture and tradition that all students deserve the opportunity to discover and exceed their greatest aspirations. a personal and transformative community since 1865,…

Education
11
The Trustees of Princeton University

Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…

Education
12
Mcphs University

Mcphs university prepares students for careers in health care through teaching, scholarship, research, professional service and community engagement.

Education
How this is measured
The grantee most central to the portfolio’s shape is St Paul's School; the most unlike its peers is Save Our Heritage Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
04the grantee network

42 grantees tracked through their own filings, 2017–2025.

Each grant beside the grantee’s revenue from every source, year by year.

How this is measured

Counted here: distinct organizations funded across 2017 to 2025, not grant rows in a single year, so this will not match the grant count on the cover. 42 of the 63 grantees resolved in that span have returns of their own we could reconcile.

Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.

1
Load-bearing (≥25% of a budget)
14
Early backer (in before they grew)
41/42
Grantees still filing
34/42
Grew since first funded

Where the money sits, by cause and then by grantee

BOYNTON FMAILY FUND - FIDELITY CHARITABLE: $1,517,986 · OtherBOYNTON FMAILY FUND - FIDELITY CHARITABLEEMERSON HEALTH: $130,350 · OtherEMERSON HEALTHEMERSON HEALTH FOUNDATION: $115,000 · OtherHARVARD COLLEGE FUND: $100,000 · OtherTHEODORA PARK FOUNDATION CO CARLOS BYRNE BNY MELLON CHARITABLE GIFT FUND: $100,000 · Other+27 more: $293,350 · Other+27 morePresident and Fellows of Harvard College: $859,375 · EducationPresident and Fellows of Harvard CollegeCONCORD FREE PUBLIC LIBRARY CORPORATION: $380,854 · EducationCONCORD FREE PUBLIC LIBRARY CORPORATIONAMHERST COLLEGE TRUSTEES: $311,645 · EducationAMHERST COLLEGE TRUSTEESMIDDLESEX SCHOOL: $232,467 · EducationMIDDLESEX SCHOOLHARVARD VARSITY CLUB INC: $105,000 · Education+7 more: $123,500 · Education+7 moreEMERSON HOSPITAL: $211,000 · HealthMOUNT DESERT NURSING ASSOC: $15,600 · Health+2 more: $2,000 · HealthNORTHEAST HARBOR SAILING SCHOOL: $101,000 · Recreation & SportsHARLEM LACROSSE AND LEADERSHIP CORPORATION: $45,000 · Recreation & SportsWomens Sports Foundation: $25,000 · Recreation & SportsCALIFORNIA COMMUNITY FOUNDATION: $75,500 · PhilanthropyRenaissance Charitable Foundation Inc: $50,000 · PhilanthropyCONCORD CARLISLE FOUNDATION INC: $36,100 · Philanthropy+1 more: $500 · PhilanthropyISLAND HOUSING TRUST CORPORATION: $80,000 · Housing & ShelterISLAND HOUSING TRUST: $50,000 · Housing & ShelterDEACONESS ABUNDANT LIFE COMMUNITIES: $5,000 · Housing & ShelterCONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM: $65,500 · Arts & CultureCONCORD250 CORPORATION: $25,000 · Arts & CultureEMERSON UMBRELLA INC: $6,000 · Arts & CultureRobbins House Inc: $5,000 · Arts & Culture+1 more: $2,850 · Arts & Culture
Other$2,256,686Education$2,012,841Health$228,600Recreation & Sports$171,000Philanthropy$162,100Housing & Shelter$135,000Arts & Culture$104,350

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetPresident and Fellows of Harvard College: $859,375 over 6y, 0.0% of budgetCONCORD FREE PUBLIC LIBRARY CORPORATION: $380,854 over 5y, 18% of budgetAMHERST COLLEGE TRUSTEES: $311,645 over 2y, 0.1% of budgetMIDDLESEX SCHOOL: $232,467 over 6y, 0.2% of budgetEMERSON HOSPITAL: $211,000 over 3y, 0.0% of budgetHARVARD VARSITY CLUB INC: $105,000 over 5y, 1.6% of budgetNORTHEAST HARBOR SAILING SCHOOL: $101,000 over 3y, 2.6% of budgetISLAND HOUSING TRUST CORPORATION: $80,000 over 3y, 0.9% of budgetCALIFORNIA COMMUNITY FOUNDATION: $75,500 over 5y, 0.0% of budgetCONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM: $65,500 over 4y, 2.2% of budgetTrustees of Hamilton College: $58,000 over 3y, 0.0% of budgetISLAND HOUSING TRUST: $50,000 over 2y, 4.2% of budgetThe Childrens Room Center for Grieving Children: $50,000 over 5y, 0.7% of budgetHARLEM LACROSSE AND LEADERSHIP CORPORATION: $45,000 over 3y, 0.5% of budgetCONCORD CARLISLE FOUNDATION INC: $36,100 over 3y, 1.5% of budgetUSA HOCKEY FOUNDATION: $25,000 over 1y, 0.2% of budgetWomens Sports Foundation: $25,000 over 1y, 0.3% of budgetCONCORD250 CORPORATION: $25,000 over 1y, 19% of budgetST PAUL'S SCHOOL: $21,000 over 3y, 0.0% of budgetSTEPPINGSTONE FOUNDATION INC: $20,000 over 2y, 0.2% of budgetMOUNT DESERT NURSING ASSOC: $15,600 over 3y, 0.1% of budgetUBUNTU GLOBAL CONNECTIONS: $15,000 over 2y, 1.7% of budgetHOUSEHOLD GOODS INC: $15,000 over 1y, 0.5% of budgetCITIZEN SCHOOLS INC: $12,500 over 2y, 0.1% of budgetAMERICAN PROMISE EDUCATION FUND INC: $10,000 over 1y, 0.5% of budgetCOMMUNITIES FOR RESTORATIVE JUSTICE INC: $6,000 over 2y, 1.0% of budgetLookup Incubator Inc: $6,000 over 2y, 1.4% of budgetEMERSON UMBRELLA INC: $6,000 over 2y, 0.0% of budgetPOSITIVE COACHING ALLIANCE: $5,000 over 1y, 0.1% of budgetRobbins House Inc: $5,000 over 1y, 1.4% of budgetDEACONESS ABUNDANT LIFE COMMUNITIES: $5,000 over 1y, 5.2% of budgetTHE SPORTS MUSEUM OF NEW ENGLAND INC: $2,850 over 1y, 0.2% of budgetTHINKGIVE INC: $2,000 over 2y, 1.7% of budgetNORTHEAST HARBOR LIBRARY: $1,000 over 2y, 0.1% of budgetUTEC Inc: $1,000 over 1y, 0.0% of budgetMOUNT DESERT ISLAND HOSPITAL: $1,000 over 1y, 0.0% of budgetTHE OPEN TABLE: $1,000 over 1y, 25% of budgetMaine Coast Heritage Trust: $500 over 1y, 0.0% of budgetSAVE OUR HERITAGE INC: $500 over 1y, 0.8% of budgetNATIONAL PARK FOUNDATION: $250 over 1y, 0.0% of budget
Grantee by grantee: a decade per organization, before and after funding

A decade per grantee: revenue shaded, grants as bars, all rows on one timeline.

Co-funders

Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.

Boston Foundation IncNeil & Anna Rasmussen…The Howard Johnson Fo…The Chicago Community…Maine Community Found…Baker Root Family Fou…Zachary and Lindsey G…The Boger Charitable …Kane Wallace Foundati…E Newbold & Margaret …Ethel D Colket Founda…Colket Family Foundat…
Boston Foundation IncMA21.9× affinity10 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Boston Foundation Inc · Neil & Anna Rasmussen Foundation · The Howard Johnson Foundation · The Chicago Community Trust · Maine Community Foundation Inc · Baker Root Family Foundation Inc · Zachary and Lindsey Gund Foundation · The Boger Charitable Trust · Kane Wallace Foundation · E Newbold & Margaret Dupont Smith F Foundation (Dba Thornedge Fdn) · Ethel D Colket Foundation · Colket Family Foundation

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization The Diomedes Foundation funds: left to right is the share of its income from government, bottom to top the share from The Diomedes Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 130%1%5%11%20%funder's share of their income ↑0%25%50%75%100%share of the org’s income from government →median 3%
  • Utec Inc: 46% of income from government
  • Communities for Restorative Justice Inc: 8% of income from government
  • Citizen Schools Inc: 8% of income from government
  • President and Fellows of Harvard College: 7% of income from government
  • The Sports Museum of New England Inc: 5% of income from government
  • Emerson Hospital: 3% of income from government
  • Island Housing Trust Corporation: 1% of income from government
  • Emerson Umbrella Inc: 1% of income from government
  • Concord Antiquarian Society D/B/a Concord Museum: 1% of income from government
  • Amherst College Trustees: 0% of income from government
  • Steppingstone Foundation Inc: 0% of income from government
no gov moneyreceives it· size = income
13get no government money at all
6report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
typical government reliance, FY20–25
How this is measured
Government income is each org’s traced federal awards (USASpending grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that a grant caused the public funding. Coverage is precision-first, a floor rather than a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12 to 24 months.
05Through Plinth

Warm introductions · Powered by PlinthPlus

How do I get to The Diomedes Foundation?

Find your warmest path to The Diomedes Foundation through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.

Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.

On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 63 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

How this is measured
Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Diomedes’ filings →

More from the funding graph

The unnamed billions
grants reported with no recipient in the public record
The regranting layer
51% of grant dollars land in the regranting layer
The DAF merry-go-round
$9.7B circulates between donor-advised funds
The endowment market
who holds foundation money, and what just moved
The camps
funders cluster by geography, not ideology
By state
where grant money is based, and what stays home