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Connecticut · Private foundation

General William Mayer Foundation

Its FY2025 filing reports that it accepted unsolicited grant applications.

$96k
Granted FY2025(still arriving)
36
Grants FY2025
36
Organizations funded FY2024
11%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$800
Largest grant, FY2025
$13,500
Organizations funded a year
26 to 40
FY2018 to FY2024
States reached, FY2025
13
Total assets, FY2025
$2.0M
Applications
Takes unsolicited applications
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 11% of the organizations General William Mayer Foundation funded were first-time grantees, receiving 26% of its grant dollars.

New vs renewed · share of each year

In FY2024, 74% of grant dollars renewed an existing relationship; $29k went to new ones.

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

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

’19’20’21’22’23’24
Human ServicesArts & CultureEnvironmentEducationHousing & ShelterYouth DevelopmentOther
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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2025still arriving35$95k9%
FY202436$113k11%
FY202334$103k3%
FY202235$78k9%
FY202140$118k25%
FY202031$35k10%
FY201934$112k26%
FY201826$72kn/a
100% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2018 to 2025.

Education$330kEnvironment$80kYouth Development$78kAnimals$74kArts & Culture$59kHuman Services$34kFood & Nutrition$28kRecreation & Sports$25kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

ME
VT
NH
IL
NY
MA
IN
CT
RI
CA
CO
TN
DC

Top grantees

Largest recipients by total granted, FY2018 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 49 grantees
All grantees of General William Mayer Foundation by total granted
GranteeTotal grantedYearsShare of their budget
Robert C Parker School$94,86581%
Chill Foundation$60,33061%
The Westerly Land Trust$60,00062%
New England College$49,10080%
Access Opportunity$34,00041%
Pine Point School Inc$27,90080%
East Woods School Inc$27,30080%
The Heimerdinger Foundation Inc$23,55082%
Justice Dance Performance Project Inc$20,00022%
Trustees of Deerfield Academy$18,55080%
Rocking the Boat Inc$15,50020%
Denison Pequotsepos Nature Center$15,00011%
Masters School$11,50080%
Mayhew$11,50020%
Colgate University$11,30080%
Stonington Community Rowing Inc$10,0001n/a
Safe Futures Inc$10,00010%
Cynisca Cycling Inc$8,80021%
Tennessee Resettlement Aid$8,40014%
Trustees of Westminster School Inc$7,10080%
St Lawrence University$7,00080%
Northwestern University$6,00080%
Kingswood Oxford School Inc$6,00080%
East Bay Bicycle Coalition DBA Bike East Bay$5,00050%
Dana Hall School$5,00070%
New Door Ventures Fka Golden Gate Community Inc$5,00010%
Sudbury Community Food Pantry$4,50060%
Boys and Girls Club of Burlington Inc$4,41050%
American Museum of Natural History$3,50070%
Boston Rescue Mission Inc$3,25070%
San Francisco Bicycle Coalition$2,80030%
The Berkshire School Inc$2,50080%
The President and Trustees of Colby College$2,30080%
Electronic Frontier Foundation Inc$2,30080%
Woodstock Farm Animal Sanctuary Inc$2,00020%
BeWell in School$2,00040%
Central City Hospitality House$2,00010%
Sudbury Valley Trustees Inc$1,50030%
Wikimedia Foundation Inc$1,40070%
Pratt Institute$1,20030%
Mystic Museum of Art Inc$1,00010%
West Nashville Dream Center$75020%
Stand Up for Pits Foundation Inc$70050%
Wall Street Bound Inc$60030%
Lake Champlain Land Trust Inc$50010%
Massachusetts Oyster Project Inc$50050%
Cuba Skate Inc$4004n/a
The Equity Alliance$25010%
The Farm School$10010%

What it could do for these grantees

Plus 10 recipients with no EIN on record ($127k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget General William Mayer Foundation supplied at peak.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetRobert C Parker School: $94,865 over 8y, 0.8% of budgetChill Foundation: $60,330 over 6y, 0.5% of budgetThe Westerly Land Trust: $60,000 over 6y, 1.6% of budgetNew England College: $49,100 over 8y, 0.0% of budgetAccess Opportunity: $34,000 over 4y, 0.9% of budgetPine Point School Inc: $27,900 over 8y, 0.1% of budgetEast Woods School Inc: $27,300 over 8y, 0.1% of budgetThe Heimerdinger Foundation Inc: $23,550 over 8y, 1.9% of budgetJustice Dance Performance Project Inc: $20,000 over 2y, 1.9% of budgetTrustees of Deerfield Academy: $18,550 over 8y, 0.0% of budgetRocking the Boat Inc: $15,500 over 2y, 0.3% of budgetDenison Pequotsepos Nature Center: $15,000 over 1y, 1.1% of budgetMasters School: $11,500 over 8y, 0.0% of budgetMayhew: $11,500 over 2y, 0.4% of budgetColgate University: $11,300 over 8y, 0.0% of budgetSafe Futures Inc: $10,000 over 1y, 0.3% of budgetCynisca Cycling Inc: $8,800 over 2y, 1.1% of budgetTennessee Resettlement Aid: $8,400 over 1y, 4.0% of budgetTrustees of Westminster School Inc: $7,100 over 8y, 0.0% of budgetSt Lawrence University: $7,000 over 8y, 0.0% of budgetNorthwestern University: $6,000 over 8y, 0.0% of budgetKingswood Oxford School Inc: $6,000 over 8y, 0.0% of budgetEast Bay Bicycle Coalition DBA Bike East Bay: $5,000 over 5y, 0.1% of budgetDana Hall School: $5,000 over 7y, 0.0% of budgetNew Door Ventures Fka Golden Gate Community Inc: $5,000 over 1y, 0.1% of budgetSudbury Community Food Pantry: $4,500 over 6y, 0.4% of budgetBoys and Girls Club of Burlington Inc: $4,410 over 5y, 0.1% of budgetAmerican Museum of Natural History: $3,500 over 7y, 0.0% of budgetBoston Rescue Mission Inc: $3,250 over 7y, 0.0% of budgetSan Francisco Bicycle Coalition: $2,800 over 3y, 0.1% of budgetThe Berkshire School Inc: $2,500 over 8y, 0.0% of budgetThe President and Trustees of Colby College: $2,300 over 8y, 0.0% of budgetElectronic Frontier Foundation Inc: $2,300 over 8y, 0.0% of budgetWoodstock Farm Animal Sanctuary Inc: $2,000 over 2y, 0.0% of budgetBeWell in School: $2,000 over 4y, 0.2% of budgetCentral City Hospitality House: $2,000 over 1y, 0.0% of budgetSudbury Valley Trustees Inc: $1,500 over 3y, 0.0% of budgetWikimedia Foundation Inc: $1,400 over 7y, 0.0% of budgetPratt Institute: $1,200 over 3y, 0.0% of budgetMystic Museum of Art Inc: $1,000 over 1y, 0.1% of budgetWest Nashville Dream Center: $750 over 2y, 0.1% of budgetStand Up for Pits Foundation Inc: $700 over 5y, 0.0% of budgetWall Street Bound Inc: $600 over 3y, 0.1% of budgetLake Champlain Land Trust Inc: $500 over 1y, 0.1% of budgetMassachusetts Oyster Project Inc: $500 over 5y, 0.2% of budgetThe Equity Alliance: $250 over 1y, 0.0% of budgetThe Farm School: $100 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 47.

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.

Kitchings Family FoundationFL15.6× affinity5 shared granteesties to 10 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Kitchings Family Foundation · Ge Aerospace Foundation · Boston Foundation Inc · Joe C Davis Foundation · The Community Foundation of Eastern Connecticut Inc · Fidelity Foundation · Ibm International Foundation · The Community Foundation of Middle Tennessee Inc · The Pfizer Foundation Inc · Citizens Charitable Foundation · National Philanthropic Trust · Eastern Bank 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 General William Mayer Foundation with peer funders

Warm introductions · Powered by PlinthPlus

How do I get to General William Mayer Foundation?

Find your warmest path to General William Mayer 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 General William Mayer Foundation

How much does General William Mayer Foundation give?
General William Mayer Foundation reported 36 grants totaling $96,000 in its FY2025 IRS filing. It funded between 26 and 40 organizations a year over FY2018 to FY2024.
What does General William Mayer Foundation fund?
By grant dollars over FY2018 to FY2025, its largest causes are Education (45%), Environment (11%), Youth Development (11%).
Who are General William Mayer Foundation's largest grantees?
By total granted over FY2018 to FY2025: Robert C Parker School ($95k), Chill Foundation ($60k), The Westerly Land Trust ($60k).
Does General William Mayer Foundation fund new organizations?
In FY2024, 11% of the organizations it funded were first-time grantees.
Does General William Mayer Foundation accept unsolicited applications?
Its most recent filing reports that it accepts unsolicited grant applications.
Which funders back the same organizations as General William Mayer Foundation?
Its strongest co-funders, measured against what their size predicts, include Kitchings Family Foundation, Ge Aerospace Foundation, Boston Foundation Inc.
Where is General William Mayer Foundation based?
General William Mayer 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 60 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

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