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New York · Private foundation

O'Donnell Iselin Foundation Inc

Its FY2025 filing reports that it accepted unsolicited grant applications.

$197k
Granted FY2025(still arriving)
33
Grants FY2025
30
Organizations funded FY2024
0%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$2,500
Largest grant, FY2025
$25,000
Organizations funded a year
29 to 39
FY2018 to FY2024
States reached, FY2025
6
Total assets, FY2025
$935k
Applications
Takes unsolicited applications
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 0% of the organizations O'Donnell Iselin Foundation Inc funded were first-time grantees, receiving 0% of its grant dollars.

New vs renewed · share of each year

In FY2024, 100% of grant dollars renewed an existing relationship; $0 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
Arts & CultureHuman ServicesHealthOther
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 arriving33$197k0%
FY202430$188k0%
FY202333$212k6%
FY202230$198k3%
FY202138$221k0%
FY202039$282k8%
FY201934$217k12%
FY201829$121k7%
100% classified

What it funded, over time

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

Education$537kEnvironment$364kHealth$277kScience & Tech$183kHuman Services$114kAnimals$81kReligion$67kArts & Culture$66kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

ME
VT
NY
MA
CT
CA
MD
TN
DC

Top grantees

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

GranteeTotal grantedYearsShare of their budget
Corporation of St Timothy's School$227,50090%
New York Botanical Garden$220,00090%
Woods Hole Oceanographic Institution$175,00090%
Planned Parenthood of Greater New York Inc$130,00090%
The Greenwich Land Trust Inc$85,00081%
St Hildas and St Hughs School$85,0008n/a
Spence-Chapin Services to Families and Children$81,00080%
Planned Parenthood of Southern New England Inc$45,00040%
United Church of Rowayton Inc$45,0009n/a
Redding Land Trust Inc$37,50095%
Show all 38 grantees
All grantees of O'Donnell Iselin Foundation Inc by total granted
GranteeTotal grantedYearsShare of their budget
Corporation of St Timothy's School$227,50090%
New York Botanical Garden$220,00090%
Woods Hole Oceanographic Institution$175,00090%
Planned Parenthood of Greater New York Inc$130,00090%
The Greenwich Land Trust Inc$85,00081%
St Hildas and St Hughs School$85,0008n/a
Spence-Chapin Services to Families and Children$81,00080%
Planned Parenthood of Southern New England Inc$45,00040%
United Church of Rowayton Inc$45,0009n/a
Redding Land Trust Inc$37,50095%
The American Society for the Prevention of Cruelty to Animals$37,50090%
Connecticut Foodshare Inc$34,50080%
Person to Person Inc$28,00080%
Medecins Sans Frontieres USA Inc$23,50090%
The Elephant Sanctuary in Tennessee$22,50090%
Americares Foundation Inc$22,50090%
All Hands and Hearts Smart Response Inc$22,00080%
Kisma Preserve$21,00092%
Dorothy Day Hospitality House Inc$19,50082%
Kieve Wavus Education Inc$18,50090%
Museum of the City of New York$15,50080%
Save the Sound$11,00060%
Haystack Mountain School of Crafts$10,50090%
Audubon Canyon Ranch Inc$8,00060%
The Salvation Army$8,0003n/a
Wings World Quest Inc$7,5001n/a
Rowayton Arts Center$7,00070%
Woodlawn Conservancy Inc$6,50060%
Friends of Bolinas Stinson Beach Libraries$3,80043%
Commonweal$3,70040%
Bolinas Museum$3,00030%
Lockwood-Mathews Mansion Museum of Norwalk Inc$3,00030%
Friends Committee on National Legislation$2,00010%
Environmental Defense Fund Incorporated$2,00010%
The Grammar School Inc$2,00010%
Bolinas Community Land Trust$2,00010%
Putney School Inc$1,00010%
Public Citizen Inc$1,00010%

What it could do for these grantees

Plus 13 recipients with no EIN on record ($364k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget O'Donnell Iselin Foundation Inc supplied at peak.

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetCorporation of St Timothy's School: $227,500 over 9y, 0.2% of budgetNew York Botanical Garden: $220,000 over 9y, 0.0% of budgetWoods Hole Oceanographic Institution: $175,000 over 9y, 0.0% of budgetPlanned Parenthood of Greater New York Inc: $130,000 over 9y, 0.0% of budgetThe Greenwich Land Trust Inc: $85,000 over 8y, 1.0% of budgetSpence-Chapin Services to Families and Children: $81,000 over 8y, 0.2% of budgetPlanned Parenthood of Southern New England Inc: $45,000 over 4y, 0.0% of budgetRedding Land Trust Inc: $37,500 over 9y, 5.3% of budgetThe American Society for the Prevention of Cruelty to Animals: $37,500 over 9y, 0.0% of budgetConnecticut Foodshare Inc: $34,500 over 8y, 0.0% of budgetPerson to Person Inc: $28,000 over 8y, 0.0% of budgetMedecins Sans Frontieres USA Inc: $23,500 over 9y, 0.0% of budgetThe Elephant Sanctuary in Tennessee: $22,500 over 9y, 0.1% of budgetAmericares Foundation Inc: $22,500 over 9y, 0.0% of budgetAll Hands and Hearts Smart Response Inc: $22,000 over 8y, 0.0% of budgetKisma Preserve: $21,000 over 9y, 1.7% of budgetDorothy Day Hospitality House Inc: $19,500 over 8y, 1.9% of budgetKieve Wavus Education Inc: $18,500 over 9y, 0.1% of budgetMuseum of the City of New York: $15,500 over 8y, 0.0% of budgetSave the Sound: $11,000 over 6y, 0.0% of budgetHaystack Mountain School of Crafts: $10,500 over 9y, 0.1% of budgetAudubon Canyon Ranch Inc: $8,000 over 6y, 0.0% of budgetRowayton Arts Center: $7,000 over 7y, 0.3% of budgetWoodlawn Conservancy Inc: $6,500 over 6y, 0.2% of budgetFriends of Bolinas Stinson Beach Libraries: $3,800 over 4y, 3.1% of budgetCommonweal: $3,700 over 4y, 0.0% of budgetBolinas Museum: $3,000 over 3y, 0.2% of budgetLockwood-Mathews Mansion Museum of Norwalk Inc: $3,000 over 3y, 0.2% of budgetFriends Committee on National Legislation: $2,000 over 1y, 0.1% of budgetEnvironmental Defense Fund Incorporated: $2,000 over 1y, 0.0% of budgetThe Grammar School Inc: $2,000 over 1y, 0.1% of budgetBolinas Community Land Trust: $2,000 over 1y, 0.5% of budgetPutney School Inc: $1,000 over 1y, 0.0% of budgetPublic Citizen Inc: $1,000 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 34.

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.

Cleveland H Dodge Foundation IncNY13.5× affinity4 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Cleveland H Dodge Foundation Inc · Maine Community Foundation Inc · Marin Community Foundation · National Philanthropic Trust · The Goldman Sachs Charitable Gift Fund · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Morgan Stanley Global Impact Funding Trust Inc · American Endowment Foundation · Vanguard Charitable Endowment Program · Jpmorgan Chase Foundation · The Bank of America Charitable Foundation Inc · Fidelity Investments Charitable Gift Fund

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 O'Donnell Iselin Foundation Inc with peer funders

About O'Donnell Iselin Foundation Inc

How much does O'Donnell Iselin Foundation Inc give?
O'Donnell Iselin Foundation Inc reported 33 grants totaling $196,500 in its FY2025 IRS filing. It funded between 29 and 39 organizations a year over FY2018 to FY2024.
What does O'Donnell Iselin Foundation Inc fund?
By grant dollars over FY2017 to FY2025, its largest causes are Education (29%), Environment (20%), Health (15%).
Who are O'Donnell Iselin Foundation Inc's largest grantees?
By total granted over FY2017 to FY2025: Corporation of St Timothy's School ($228k), New York Botanical Garden ($220k), Woods Hole Oceanographic Institution ($175k).
Does O'Donnell Iselin Foundation Inc fund new organizations?
In FY2024, 0% of the organizations it funded were first-time grantees.
Does O'Donnell Iselin Foundation Inc accept unsolicited applications?
Its most recent filing reports that it accepts unsolicited grant applications.
Which funders back the same organizations as O'Donnell Iselin Foundation Inc?
Its strongest co-funders, measured against what their size predicts, include Cleveland H Dodge Foundation Inc, Maine Community Foundation Inc, Marin Community Foundation.
Where is O'Donnell Iselin Foundation Inc based?
O'Donnell Iselin Foundation Inc is based in NY.

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 52 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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