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Connecticut · Private foundation

Mad River 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.

$120k
Granted FY2022
49
Itemized grants FY2022
48
Organizations funded FY2022
Read the full brief
Itemized, FY2022
$109k
The rest is grants the schedule does not break out
Median grant, FY2022
$1,000
Largest grant, FY2022
$15,000
States reached, FY2022
16
Total assets, FY2022
$871k
Applications
Preselected organizations only
Per its most recent filing; check its own site
91% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2021 to 2025.

Education$26kHealth$19kAnimals$18kPhilanthropy$13kReligion$11kHuman Services$7kEnvironment$6kInternational$4kOther$0

Top grantees

Largest recipients by total granted, FY2022 to FY2022, and the share of each one’s budget the grants supplied at peak.

Show all 29 grantees

What it could do for these grantees

Plus 19 recipients with no EIN on record ($35k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Mad River Foundation supplied at peak.

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetAnimal Welfare Society Inc: $15,000 over 1y, 0.5% of budgetThe Greenwich Library: $10,000 over 1y, 0.2% of budgetGreenwich Hospital: $10,000 over 1y, 0.0% of budgetThe Madeira School: $6,000 over 1y, 0.0% of budgetUnited Way of Greenwich Inc: $5,000 over 1y, 0.3% of budgetGlobalgiving Foundation Inc: $3,250 over 1y, 0.0% of budgetFreedom Institute Inc: $2,000 over 1y, 0.1% of budgetSunshine Gospel Ministries: $2,000 over 1y, 0.1% of budgetMontana Family Foundation Inc: $2,000 over 1y, 1.2% of budgetGallatin County Love Inc: $2,000 over 1y, 0.1% of budgetSt Jude Children's Research Hospital Inc: $1,500 over 1y, 0.0% of budgetDana-Farber Cancer Institute Inc: $1,500 over 1y, 0.0% of budgetTrustees of Tufts College: $1,500 over 1y, 0.0% of budgetBarrier Island Parks Society Inc: $1,000 over 1y, 0.1% of budgetBelmont Hill School Inc: $1,000 over 1y, 0.0% of budgetAtlantic White Shark Conservancy Inc: $1,000 over 1y, 0.1% of budgetAgawam Council: $1,000 over 1y, 0.1% of budgetRafiki Foundation Inc: $1,000 over 1y, 0.0% of budgetProuts Neck Audubon Society: $1,000 over 1y, 1.5% of budgetChesapeake Bay Foundation Inc: $1,000 over 1y, 0.0% of budgetMcDonogh School Incorporated: $1,000 over 1y, 0.0% of budgetThe Island School Inc: $500 over 1y, 0.0% of budgetSuncoast Humane Societyinc: $500 over 1y, 0.0% of budgetNatural Resources Defense Council Inc: $500 over 1y, 0.0% of budgetFood Link Inc: $500 over 1y, 0.0% of budgetBoca Grande Health Clinic Fndtn Inc: $500 over 1y, 0.0% of budgetWorld Central Kitchen Inc: $500 over 1y, 0.0% of budgetPlanned Parenthood Federation of America Inc: $500 over 1y, 0.0% of budgetSouthern Poverty Law Center Inc: $500 over 1y, 0.0% of budget

Tap a dot to name the grantee.

How this is measured
Share of budget is the funder’s grant in a year over the grantee’s total revenue that year, at its highest across the years we hold; revenue is from all sources. Only grantees confirmed against their own filings, whose grants do not exceed their revenue, are plotted: the largest 29.

Nonprofits that may fit its grantmaking

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.

Ge Aerospace FoundationCT11.2× affinity4 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Ge Aerospace Foundation · Raymond James Charitable Endowment Fund · American Endowment Foundation · National Philanthropic Trust · Vanguard Charitable Endowment Program · The Pfizer Foundation Inc · The Bank of America Charitable Foundation Inc · Donor Advised Charitable Giving Inc · Natl Christian Charitable Fdn Inc · Fidelity Investments Charitable Gift Fund · American Online Giving Foundation Inc · Amazonsmile 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.

Compare Mad River Foundation with peer funders

Warm introductions · Powered by PlinthPlus

How do I get to Mad River Foundation?

Find your warmest path to Mad River 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.

About Mad River Foundation

How much does Mad River Foundation give?
Mad River Foundation reported 49 itemized grants totaling $108,750, out of $120,000 in total grant expense reported on the return in its FY2022 IRS filing.
What does Mad River Foundation fund?
By grant dollars over FY2022 to FY2022, its largest causes are Education (5%), Health (3%), Animals (3%).
Who are Mad River Foundation's largest grantees?
By total granted over FY2022 to FY2022: Animal Welfare Society Inc ($15k), The Greenwich Library ($10k), Greenwich Hospital ($10k).
Does Mad River Foundation accept unsolicited applications?
Its most recent filing reports that it funds preselected organizations and does not take unsolicited requests. Check the foundation's own site before ruling it out.
Which funders back the same organizations as Mad River Foundation?
Its strongest co-funders, measured against what their size predicts, include Ge Aerospace Foundation, Raymond James Charitable Endowment Fund, American Endowment Foundation.
Where is Mad River Foundation based?
Mad River Foundation is based in CT.

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 48 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 2022, released 2022. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Possibly out of date. A more recent filing (FY2025) is on record and reports $122k of grant expense with no grantee named in the published copy. A private foundation itemizes every grant it makes, so a return carrying none has filed its list as an attachment that the public copy does not include. The figures above are therefore from FY2022, the most recent year this funder’s grantee list reached the public record.

Source object · view filing

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