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Connecticut · Private foundation

Calf Island 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.

$10k
Granted FY2025(still arriving)
1
Grants FY2025
6
Organizations funded FY2024
17%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$10,000
Largest grant, FY2025
$10,000
Organizations funded a year
4 to 25
FY2018 to FY2024
States reached, FY2025
1
Total assets, FY2025
$172k
Applications
Preselected organizations only
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 17% of the organizations Calf Island Foundation funded were first-time grantees, receiving 12% of its grant dollars.

New vs renewed · share of each year

In FY2024, 88% of grant dollars renewed an existing relationship; $5k went to new ones.

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

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

’18’19’20’21’22’23’24
EducationArts & CultureHuman ServicesHealthEnvironmentInternationalOther
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 arriving1$10k0%
FY20246$41k17%
FY20234$12k50%
FY20228$23k63%
FY20216$20k50%
FY202012$87k50%
FY201925$111k80%
FY20189$16k100%
100% classified

What it funded, over time

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

Health$100kArts & Culture$79kEducation$73kEnvironment$41kHuman Services$16kInternational$16kReligion$8kHousing & Shelter$8kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

ME
IL
NY
MA
PA
NJ
CT
RI
MD
DC

Top grantees

Largest recipients by total granted, FY2017 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 41 grantees
All grantees of Calf Island Foundation by total granted
GranteeTotal grantedYearsShare of their budget
Greenwich Hospital$50,00020%
The Academy for Teachers Inc$39,90041%
The Irish Georgian Society Inc$35,10133%
New York Botanical Garden$20,00030%
Sail to Prevail$13,00041%
Natural Areas Conservancy Inc$9,50040%
Cancer Research Fund of the Damon Runyon-Walter Winchell Foundation$8,50030%
Scenic Hudson Inc$6,50030%
Greenwich Emergency Medical Service Inc$6,00010%
Hyde Hall Inc$5,50011%
Medecins Sans Frontieres USA Inc$5,50020%
The Greenwich Library$5,00010%
Women in Need Inc$5,00010%
The Rockefeller University$5,00010%
New York Women's Foundation Inc$5,00010%
Blair Academy$5,00010%
Prep for Prep$5,00020%
Presbyterian Church in the Town of Rye$5,0001n/a
The Jay Heritage Center$3,75011%
Fund for Park Avenue New York Inc$3,50030%
Marquand Park Foundation$2,50013%
Central Park Conservancy Inc$2,50010%
New York Historical Society$2,50010%
Blythedale Children's Hospital$2,50010%
Abilis Inc$2,50010%
Fund for the Aged Inc$2,50010%
At Home in Greenwich Inc$2,50011%
Exodus School$2,50010%
Housing Plus Solutions Inc$2,50010%
Fund for Women's Equality Inc$2,00010%
Children of Bellevue Inc$2,00020%
The Battery Conservancy Inc$2,00010%
Metropolitan Museum of Art$2,00020%
Cahoon Museum of American Art Inc$1,50010%
White Plains Library Foundation Inc$1,50011%
Congregation Emanu-El of Westchester$1,5001n/a
The Jewish Community Center in Manhattan Inc$1,50010%
Port Chester Carver Center Inc$1,00010%
Teachers College Columbia University$1,00010%
Rye Country Day School$1,00010%
Stroud Water Research Center$50010%

What it could do for these grantees

Plus 11 recipients with no EIN on record ($54k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Calf Island Foundation supplied at peak.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetGreenwich Hospital: $50,000 over 2y, 0.0% of budgetThe Academy for Teachers Inc: $39,900 over 4y, 1.5% of budgetThe Irish Georgian Society Inc: $35,101 over 3y, 3.1% of budgetNew York Botanical Garden: $20,000 over 3y, 0.0% of budgetSail to Prevail: $13,000 over 4y, 0.6% of budgetNatural Areas Conservancy Inc: $9,500 over 4y, 0.2% of budgetCancer Research Fund of the Damon Runyon-Walter Winchell Foundation: $8,500 over 3y, 0.0% of budgetScenic Hudson Inc: $6,500 over 3y, 0.0% of budgetGreenwich Emergency Medical Service Inc: $6,000 over 1y, 0.1% of budgetHyde Hall Inc: $5,500 over 1y, 0.7% of budgetMedecins Sans Frontieres USA Inc: $5,500 over 2y, 0.0% of budgetThe Greenwich Library: $5,000 over 1y, 0.2% of budgetWomen in Need Inc: $5,000 over 1y, 0.0% of budgetThe Rockefeller University: $5,000 over 1y, 0.0% of budgetNew York Women's Foundation Inc: $5,000 over 1y, 0.0% of budgetBlair Academy: $5,000 over 1y, 0.0% of budgetPrep for Prep: $5,000 over 2y, 0.0% of budgetThe Jay Heritage Center: $3,750 over 1y, 1.1% of budgetFund for Park Avenue New York Inc: $3,500 over 3y, 0.2% of budgetMarquand Park Foundation: $2,500 over 1y, 3.1% of budgetCentral Park Conservancy Inc: $2,500 over 1y, 0.0% of budgetNew York Historical Society: $2,500 over 1y, 0.0% of budgetBlythedale Children's Hospital: $2,500 over 1y, 0.0% of budgetAbilis Inc: $2,500 over 1y, 0.0% of budgetFund for the Aged Inc: $2,500 over 1y, 0.0% of budgetAt Home in Greenwich Inc: $2,500 over 1y, 0.6% of budgetExodus School: $2,500 over 1y, 0.1% of budgetHousing Plus Solutions Inc: $2,500 over 1y, 0.0% of budgetFund for Women's Equality Inc: $2,000 over 1y, 0.2% of budgetChildren of Bellevue Inc: $2,000 over 2y, 0.1% of budgetThe Battery Conservancy Inc: $2,000 over 1y, 0.0% of budgetMetropolitan Museum of Art: $2,000 over 2y, 0.0% of budgetCahoon Museum of American Art Inc: $1,500 over 1y, 0.1% of budgetWhite Plains Library Foundation Inc: $1,500 over 1y, 0.6% of budgetThe Jewish Community Center in Manhattan Inc: $1,500 over 1y, 0.0% of budgetPort Chester Carver Center Inc: $1,000 over 1y, 0.0% of budgetTeachers College Columbia University: $1,000 over 1y, 0.0% of budgetRye Country Day School: $1,000 over 1y, 0.0% of budgetStroud Water Research Center: $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 39.

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.

Jewish Communal FundNY16.7× affinity8 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Jewish Communal Fund · The Chicago Community Trust · The Goldman Sachs Charitable Gift Fund · Charina Foundation Inc Richard Menschel · The New York Community Trust · The Bessemer Giving Fund · National Philanthropic Trust · The Ayco Charitable Foundation · Vanguard Charitable Endowment Program · Morgan Stanley Global Impact Funding Trust Inc · Jpmorgan Chase Foundation · The Bank of America Charitable Foundation Inc

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 Calf Island Foundation with peer funders

About Calf Island Foundation

How much does Calf Island Foundation give?
Calf Island Foundation reported 1 grants totaling $10,000 in its FY2025 IRS filing. It funded between 4 and 25 organizations a year over FY2018 to FY2024.
What does Calf Island Foundation fund?
By grant dollars over FY2017 to FY2025, its largest causes are Health (28%), Arts & Culture (23%), Education (21%).
Who are Calf Island Foundation's largest grantees?
By total granted over FY2017 to FY2025: Greenwich Hospital ($50k), The Academy for Teachers Inc ($40k), The Irish Georgian Society Inc ($35k).
Does Calf Island Foundation fund new organizations?
In FY2024, 17% of the organizations it funded were first-time grantees.
Does Calf Island 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 Calf Island Foundation?
Its strongest co-funders, measured against what their size predicts, include Jewish Communal Fund, The Chicago Community Trust, The Goldman Sachs Charitable Gift Fund.
Where is Calf Island Foundation based?
Calf Island 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 54 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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