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The Winterburn Foundation at a glance

· Private foundation

The Winterburn 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.

$500k
Granted FY2025still arriving
1
Grants FY2025still arriving
1
States reached
$500k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
01What it funds
01100% classified

What it funded, over time

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

International$1.4MAnimals$485kArts & Culture$260kHealth$150kEnvironment$125kScience & Tech$20kHuman Services$10k
02FY2025 · 1 grant

Where the money goes

Grants by size, and the largest recipients.

$500,000
Median grant
1
States reached
$3.1M
Total assets
Largest grants
RecipientAmount
INTERNATIONAL RESCUE COMMITTEE$500,000
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:

Dollar for dollar, its grants (FY17–25) land where the poverty rate runs at 17%, against an area that typically sits at 14%. 96% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 14%MAYO CLINIC: $25k → 9%PHELPS MEMORIAL HOSPITAL CENTER: $25k → 9%BLACK ROCK FOREST: $5k → 14%CORNELL UNIVERSITY - COLLEGE OF VETERINARY MEDICINE: $75k → 16%OPEN SPACE INSTITUTE: $25k → 17%WILDLIFE CONSERVATION SOCIETY: $25k → 28%PHELPS MEMORIAL HOSPITAL CENTER: $10k → 9%BLACK ROCK FOREST: $5k → 14%CORNELL UNIVERSITY - COLLEGE OF VETERINARY MEDICINE: $50k → 16%OPEN SPACE INSTITUTE: $25k → 17%PHELPS MEMORIAL HOSPITAL CENTER: $10k → 9%BLACK ROCK FOREST: $5k → 14%CORNELL UNIVERSITY - COLLEGE OF VETERINARY MEDICINE: $25k → 16%OPEN SPACE INSTITUTE: $25k → 17%PHELPS MEMORIAL HOSPITAL CENTER: $10k → 9%CORNELL UNIVERSITY - COLLEGE OF VETERINARY MEDICINE: $10k → 16%OPEN SPACE INSTITUTE INC: $25k → 17%OPEN SPACE INSTITUTE INC: $25k → 17%INSTITUTE OF INTERNATIONAL EDUCATION: $75k → 17%VISITING NURSE SERVICE OF NEW YORK: $25k → 17%VISITING NURSE SERVICE OF NEW YORK: $25k → 17%VISITING NURSE SERVICE OF NEW YORK: $10k → 17%METROPOLITAN MUSEUM OF ART: $150k → 17%METROPOLITAN MUSEUM OF ART: $25k → 17%METROPOLITAN MUSEUM OF ART: $25k → 17%ANIMAL MEDICAL CENTER: $100k → 17%ANIMAL MEDICAL CENTER: $50k → 17%YOUNG CONCERT ARTISTS: $10k → 17%ANIMAL MEDICAL CENTER: $50k → 17%YOUNG CONCERT ARTISTS: $10k → 17%ANIMAL MEDICAL CENTER: $25k → 17%YOUNG CONCERT ARTISTS: $10k → 17%ANIMAL MEDICAL CENTER: $25k → 17%YOUNG CONCERT ARTISTS: $10k → 17%ANIMAL MEDICAL CENTER: $25k → 17%YOUNG CONCERT ARTISTS: $10k → 17%INTERNATIONAL RESCUE COMMITTEE: $500k → 17%INTERNATIONAL RESCUE COMMITTEE: $200k → 17%INTERNATIONAL RESCUE COMMITTEE: $65k → 17%INTERNATIONAL RESCUE COMMITTEE: $65k → 17%INTERNATIONAL RESCUE COMMITTEE: $65k → 17%INTERNATIONAL RESCUE COMMITTEE: $65k → 17%INTERNATIONAL RESCUE COMMITTEE: $65k → 17%INSTITUTE OF INTERNATIONAL EDUCATION: $100k → 17%INSTITUTE OF INTERNATIONAL EDUCATION: $100k → 17%INSTITUTE OF INTERNATIONAL EDUCATION - SCHOLAR RESCUE FUND: $50k → 17%INSTITUTE OF INTERNATIONAL EDUCATION: $25k → 17%COMMUNITY SERVICE SOCIETY OF NY: $10k → 17%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.
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.

96%of every dollar goes to organizations it has funded before.
$2.0M · 9 repeat orgs$85k to everyone else

Grantees it renews have grown median revenue +73% since the first grant, against +59% for those funded once.

9 repeat relationships: 1 still active in FY2025, 8 since wound down.

How the two cohorts compare

Re-uppedFunded once

Organizations

9
3

Total granted

$2.0M
$85k

Median revenue growth · since first grant

+73%
+59%

Still filing today

78%
33%

New vs renewed · share of each year

In FY2025, 100% of grant dollars renewed an existing relationship; $0 went to new ones.

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

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

’17’18’19’20’21’22’25
AnimalsArts & CultureHealthInternationalEnvironmentOther
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

  • IR
    International Rescue Committee INC
    7× · 2017–2025 · $1.0M · revenue +81%
  • TA
    THE ANIMAL MEDICAL CENTER
    6× · 2017–2022 · $275k · revenue +77%
  • MM
    METROPOLITAN MUSEUM OF ART
    3× · 2018–2020 · $200k · revenue +58%

Funded once

  • IO
    INSTITUTE OF INTERNATIONAL EDUCATION - SCHOLAR RESCUE FUND
    one grant, 2018 · $50k
  • WC
    Wildlife Conservation Societygraduated
    one grant, 2017 · $25k · revenue +59%
  • CS
    COMMUNITY SERVICE SOCIETY OF NY
    one grant, 2018 · $10k
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
New York University

Nyu is a private university with approximately 60,000 matriculating students in 20 schools and institutes. nyu's primary missions are education, research and scholarship, and patient care.

Education
2
American Museum of Natural History

The museum's mission statement is: "to discover, interpret, and disseminate - through scientific research and education - knowledge about human cultures, the natural world, and the universe."

Arts & Culture
3
Massachusetts Eye & Ear Infirmary

THE MASSACHUSETTS EYE AND EAR INFIRMARY ("THE INFIRMARY") IS A NOT-FOR-PROFIT TEACHING HOSPITAL CONDUCTING PATIENT CARE AND RESEARCH. THE INFIRMARY IS A TEACHING HOSPITAL OF HARVARD MEDICAL SCHOOL AND AN INTERNATIONAL CENTER FOR RESEARCH.…

Health
4
New York Genome Center Inc

Operate a state-of-the-art, world-class genomic research center that creates and uses advanced genomics to understand the genetic basis of disease. for more information, see schedule o.

Health
5
National September 11 Memorial and Museum At the World Trade Center

The national september 11 memorial & museum at the world trade center bears solemn witness to the terrorist attacks of september 11, 2001, and february 26, 1993. located at a site made sacred through loss, the memorial & museum remembers…

Arts & Culture
6
University of Miami

See Form 990, Part I, Line 1, Description of Organization Mission.

Education
7
Institute for Advanced Study - Louis Bamberger & Mrs Felix Fuld Foundation

The institute for advanced study (the institute) is one of the world's leading centers for theoretical research and intellectual inquiry. see schedule o.

Science & Tech
8
Museum of the City of New York

The museum of the city of new york fosters understanding of the distinctive nature of urban life in the world's most influential metropolis. it engages visitors by celebrating, documenting, and interpreting the city's past, present, and…

Arts & Culture
9
New York Society for the Relief of the Ruptured and Crippled Maintaining the

The mission of hospital for special surgery is to provide the highest quality patient care, improve mobility, and enhance the quality of life for all and to advance the science of orthopedic surgery, rheumatology, and their related…

Health
10
Massachusetts Eye and Ear Associates Inc

MASSACHUSETTS EYE AND EAR ASSOCIATES, INC. ("MEEA") IS A SPECIALTY PHYSICIAN GROUP PRACTICE. IT PROVIDES CARE FOR PATIENTS OF THE MASSACHUSETTS EYE AND EAR INFIRMARY, INC. ("MEEI"), A RELATED ORGANIZATION. THE PRACTICE SPECIALIZES IN…

Health
11
Apex Art Curatorial Program Inc

Apex Art Curatorial Program is a resolutely noncommercial visual art exhibition space which provides curators and artists with a venue dedicated to ideas that are often too provocative or too small in scope for display elsewhere. Apex Art…

Arts & Culture
12
Memorial Sloan-Kettering Cancer Center

Leadership in the prevention, treatment, and cure of cancer through excellence, vision and cost effectiveness in patient care, outreach programs, research, and education.

Health
How this is measured
The grantee most central to the portfolio’s shape is Visiting Nurse Service of New York; the most unlike its peers is Wildlife Conservation Society. 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

10 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. 10 of the 14 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.

0
Load-bearing (≥25% of a budget)
1
Early backer (in before they grew)
10/10
Grantees still filing
10/10
Grew since first funded

Where the money sits, by cause and then by grantee

International Rescue Committee INC: $1,025,000 · InternationalInternational Rescue Committee INCINSTITUTE OF INTERNATIONAL EDUCATION INC: $300,000 · InternationalINSTITUTE OF INTERNATIONAL EDUCATION INCTHE ANIMAL MEDICAL CENTER: $275,000 · AnimalsTHE ANIMAL MED…Wildlife Conservation Society: $25,000 · AnimalsWildlife Conse…CORNELL UNIVERSITY - COLLEGE OF VETERINARY MEDICINE: $185,000 · OtherCORNELL UNIV…INSTITUTE OF INTERNATIONAL EDUCATION - SCHOLAR RESCUE FUND: $50,000 · OtherINSTITUTE OF…Individual grant recipient: $20,000 · OtherIndividual g…COMMUNITY SERVICE SOCIETY OF NY: $10,000 · OtherMETROPOLITAN MUSEUM OF ART: $200,000 · Arts & CultureMETROPOLITAN…YOUNG CONCERT ARTISTS INC: $60,000 · Arts & CultureYOUNG CONCER…VISITING NURSE SERVICE OF NEW YORK: $65,000 · HealthPHELPS MEMORIAL HOSPITAL ASSOCIATION: $60,000 · HealthMAYO CLINIC: $25,000 · HealthOPEN SPACE INSTITUTE INC: $125,000 · Environment
International$1,325,000Animals$300,000Other$265,000Arts & Culture$260,000Health$150,000Environment$125,000

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

25%50%75%100%$10M$100Mgrantee revenue →↑ funder's share of their budgetInternational Rescue Committee INC: $1,025,000 over 7y, 0.0% of budgetINSTITUTE OF INTERNATIONAL EDUCATION INC: $300,000 over 4y, 0.0% of budgetTHE ANIMAL MEDICAL CENTER: $275,000 over 6y, 0.1% of budgetMETROPOLITAN MUSEUM OF ART: $200,000 over 3y, 0.0% of budgetOPEN SPACE INSTITUTE INC: $125,000 over 5y, 1.2% of budgetVISITING NURSE SERVICE OF NEW YORK: $65,000 over 4y, 0.1% of budgetYOUNG CONCERT ARTISTS INC: $60,000 over 6y, 0.4% of budgetPHELPS MEMORIAL HOSPITAL ASSOCIATION: $60,000 over 5y, 0.0% of budgetMAYO CLINIC: $25,000 over 1y, 0.0% of budgetWildlife Conservation Society: $25,000 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.

  • Who funds International Rescue Committee INC ↗
  • Who funds INSTITUTE OF INTERNATIONAL EDUCATION INC ↗
  • Who funds THE ANIMAL MEDICAL CENTER ↗
  • Who funds METROPOLITAN MUSEUM OF ART ↗
  • Who funds OPEN SPACE INSTITUTE INC ↗
  • Who funds VISITING NURSE SERVICE OF NEW YORK ↗
  • Who funds YOUNG CONCERT ARTISTS INC ↗
  • Who funds PHELPS MEMORIAL HOSPITAL ASSOCIATION ↗
  • Who funds MAYO CLINIC ↗
  • Who funds Wildlife Conservation Society ↗

How much its grantees rely on government

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

2024
’20’21’22’23’24’25
no gov · 00%0%1%3%5%funder's share of their income ↑0%23%45%68%90%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get no government money at all
    2report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    ⤢ axis zoomed · 0–90%
    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.

    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 14 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 Winterburn’s 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