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The Sidney J Weinberg Jr Foundation at a glance

· Private foundation

The Sidney J Weinberg Jr Foundation

Its FY2024 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$5.8M
Granted FY2024still arriving
32
Grants FY2024still arriving
5
States reached
$2.1M
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0197% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2020 to 2024.

Education$8.7MArts & Culture$4.7MHealth$4.4MRecreation & Sports$3.8MEnvironment$740kInternational$410kHuman Services$375kPhilanthropy$210kOther$0
02FY2024 · 32 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2024

  • Under $10k6 grants · $29k
  • $10k–50k13 grants · $185k
  • $50k–250k7 grants · $710k
  • $250k+6 grants · $4.8M
$20,000
Median grant
5
States reached
$21M
Total assets
Largest grants
RecipientAmount
CENTRAL PARK CONSERVANCY$2,125,000
MEMORIAL SLOAN KETTERING$1,000,000
AMERICAN FRIENDS OF LES ARTS FLORISSANTS$720,000
JULLIARD SCHOOL$475,000
COLUMBIA UNIVERSITY$280,000
TOBEY HOSPITAL$250,000
AMERICAN ACADEMY IN ROME$160,000
LIBRARY OF AMERICA$150,000
FRIENDS OF THE HIGH LINE$100,000
OPEN SPACE INSTITUTE$100,000
FAMILY CENTERS$75,000
LAKEVILLE JOURNAL FOUNDATION$75,000
BUZZARDS BAY COALITION$50,000
THE METROPOLITAN OPERA$30,000
OPENING ACT$25,000
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 (FY20–24) land where the poverty rate runs at 16%, against an area that typically sits at 11%. 90% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 11%BUZZARDS BAY COALITION: $150k → 11%HARVARD BUSINESS SCHOOL: $750k → 16%THE KINGS ACADEMY: $500k → 8%FRIENDS OF THE HIGH LINE: $225k → 17%THE HOTCHKISS LIBRARY OF SHARON: $250k → 9%HARVARDS BUSINESS SCHOOL: $500k → 16%FRIENDS OF THE HIGH LINE: $150k → 17%HARVARDS BUSINESS SCHOOL: $500k → 16%FRIENDS OF THE HIGH LINE: $150k → 17%AMERICAN ACADEMY IN ROME: $160k → 17%NEW YORK PUBLIC LIBRARY: $230k → 17%New York Public Library: $220k → 17%NEW YORK PUBLIC LIBRARY: $120k → 17%TOBEY HOSPITAL: $260k → 8%Southcoast Health - Tobey Hospital: $250k → 8%TOBEY HOSPITAL: $250k → 8%CENTRAL PARK CONSERVANCY: $2.1M → 17%CENTRAL PARK CONSERVANCY: $300k → 17%LIBRARY OF AMERICA: $300k → 17%Library of America: $250k → 17%CENTRAL PARK CONSERVANCY: $250k → 17%CENTRAL PARK CONSERVANCY: $250k → 17%Central Park Conservancy: $170k → 17%LIBRARY OF AMERICA: $150k → 17%LIBRARY OF AMERICA: $150k → 17%LIBRARY OF AMERICA: $150k → 17%LIBRARY OF AMERICA: $150k → 17%CENTRAL PARK CONSERVANCY: $125k → 17%CENTRAL PARK CONSERVANCY: $125k → 17%CENTRAL PARK CONSERVANCY: $125k → 17%COLUMBIA UNIVERSITY: $2.3M → 17%COLUMBIA UNIVERSITY - THE ITALIAN ACADEMY: $730k → 17%COLUMBIA UNIVERSITY: $280k → 17%COLUMBIA UNIVERSTY - THE ITALIAN ACADEMY: $230k → 17%COLUMBIA UNIVERSITY - THE ITALIAN ACADEMY: $230k → 17%Julliard School: $475k → 17%JULLIARD SCHOOL: $475k → 17%THE JULLIARD SCHOOL: $150k → 17%AMERICAN FRIENDS OF LES ARTS FLORISSANTS: $140k → 17%CHAMBER MUSIC SOCIETY: $125k → 17%CHAMBER MUSIC SOCIETY: $125k → 17%CHAMBER MUSIC SOCIETY: $125k → 17%MEMORIAL SLOAN KETTERING CANCER CENTER: $1.0M → 17%MEMORIAL SLOAN KETTERING CANCER CENTER: $1.0M → 17%MEMORIAL SLOAN KETTERING: $1.0M → 17%MEMORIAL SLOAN KETTERING CANCER CENTER: $500k → 17%AMERICAN FRIENDS OF LES ARTS FLORISSANTS: $720k → 17%American Friends of Les Arts Florissants: $720k → 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.

Which US states its grants reach

NY
MA
NJ
CT
CA
NE
NC
FL
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.

83%of every dollar goes to organizations it has funded before.
$17M · 40 repeat orgs$3.5M to everyone else

Grantees it renews have grown median revenue +54% since the first grant, against +27% for those funded once.

40 repeat relationships: 26 still active in FY2024, 14 since wound down; 5 grantees were first funded in FY2024 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

40
12

Total granted

$17M
$2.3M

Median revenue growth · since first grant

+54%
+27%

Still filing today

68%
33%

New vs renewed · share of each year

In FY2024, 78% of grant dollars renewed an existing relationship; $1.2M went to new ones.

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

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

’20’21’22’23’24
Arts & CultureEducationEnvironmentRecreation & SportsInternationalHealthOther
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

  • CP
    CENTRAL PARK CONSERVANCY INC
    5× · 2020–2024 · $3.5M · revenue +167%
  • AF
    AMERICAN FRIENDS OF LES ARTS FLORISSANTS INC
    5× · 2020–2024 · $1.8M · revenue +66% · 33% of their budget
  • TL
    THE LITERARY CLASSICS OF THE US INC D/B/A LIBRARY OF AMERICA
    5× · 2020–2024 · $1.3M · revenue +6%

Funded once

  • HB
    HARVARD BUSINESS SCHOOL
    one grant, 2020 · $750k
  • TK
    THE KING'S ACADEMYgraduated
    one grant, 2022 · $500k · revenue +27%
  • SH
    Southcoast Health - Tobey Hospital
    one grant, 2023 · $250k
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
Boston Architectural College

The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.

—
2
New York Botanical Garden

The new york botanical garden is a museum of plants and a scientific research center devoted to the study of plants and their uses. it is the garden's mission to improve public understanding of the natural world, horticulture, and the…

Environment
3
University of New Haven

The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…

Education
4
The Trustees of the New York Society Library

The new york society library was founded in 1754 by the new york society, a civic-minded group formed in the belief that the availability of books would help the city of new york to prosper.

—
5
New York Landmarks Conservancy Inc

The conservancy preserves and revitalizes new york's architecture. by doing so, it contributes to new york's economy, tourism and quality of life.

—
6
The Frick Collection

The Frick Collection (the "Collection") operates an internationally recognized art museum and library program for the inspiration and enjoyment of the public and for the advancement of the study of fine arts and kindred subjects.

—
7
The Pierpont Morgan Library

The Morgan Library & Museum celebrates and shares the history and process of human creativity from antiquity to the present day through the preservation, study, and interpretation of a dynamic and growing collection.

Education
8
The Trustees of Princeton University

Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…

Education
9
Museum of Modern Art

The Museum of Modern Art is a private, non-profit institution chartered by the State of New York Department of Education in 1929 to foster public awareness of modern and contemporary art. (Continued in Schedule O)

Arts & Culture
10
Manhattanville University

To educate students to be ethical and socially responsible leaders in a global community.

Education
11
Harvard Conservation Trust

To preserve the unique character and natural resources of harvard.

Environment
12
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
How this is measured
The grantee most central to the portfolio’s shape is The New York Public Library Astor Lenox and Tilden Foundations; the most unlike its peers is Community Nurse Inc. 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

36 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. 36 of the 59 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.

1
Load-bearing (≥25% of a budget)
4
Early backer (in before they grew)
35/36
Grantees still filing
23/36
Grew since first funded

Where the money sits, by cause and then by grantee

MEMORIAL SLOAN KETTERING CANCER CENTER: $2,500,000 · OtherMEMORIAL SLOAN KETTERING CANCER CENTERHARVARDS BUSINESS SCHOOL: $1,000,000 · OtherHARVARDS BUSINESS SCHOOLMEMORIAL SLOAN KETTERING: $1,000,000 · OtherMEMORIAL SLOAN KETTERINGCOLUMBIA UNIVERSITY - THE ITALIAN ACADEMY: $960,000 · OtherCOLUMBIA UNIVERSITY - THE ITALIAN ACADEMYHARVARD BUSINESS SCHOOL: $750,000 · OtherHARVARD BUSINESS SCHOOLTOBEY HOSPITAL: $540,000 · OtherTOBEY HOSPITALCHAMBER MUSIC SOCIETY: $425,000 · OtherFAMILY CENTERS INC: $375,000 · Other+22 more: $1,503,500 · Other+22 moreTHE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK: $2,610,000 · EducationTHE TRUSTEES OF COLUMBIA UN…JUILLIARD SCHOOL: $1,235,000 · EducationJUILLIARD SCHOOLThe New York Public Library Astor Lenox and Tilden Foundations: $910,000 · EducationThe New York Public Library…THE KING'S ACADEMY: $500,000 · EducationTHE KING'S ACADEMYHOTCHKISS LIBRARY OF SHARON INC: $250,000 · Education+2 more: $122,500 · EducationAMERICAN FRIENDS OF LES ARTS FLORISSANTS INC: $1,819,400 · Arts & CultureAMERICAN FRIENDS OF…THE LITERARY CLASSICS OF THE US INC D/B/A LIBRARY OF AMERICA: $1,250,000 · Arts & CultureTHE LITERARY CLASSI…FRIENDS OF THE HIGH LINE INC: $625,000 · Arts & CultureFRIENDS OF THE HIGH…+6 more: $270,000 · Arts & Culture+6 moreCENTRAL PARK CONSERVANCY INC: $3,470,200 · Recreation & SportsCENTRAL PARK CONS…PROSPECT PARK ALLIANCE INC: $130,000 · Recreation & SportsBUZZARDS BAY COALITION: $345,000 · EnvironmentOPEN SPACE INSTITUTE INC: $175,000 · EnvironmentNATURAL AREAS CONSERVANCY INC: $60,000 · EnvironmentBROOKLYN BOTANIC GARDEN CORPORATION: $60,000 · EnvironmentTHE TRUSTEES OF RESERVATIONS: $60,000 · EnvironmentSIPPICAN LANDS TRUST INC: $25,000 · EnvironmentAMERICAN ACADEMY IN ROME: $400,000 · International+1 more: $10,000 · InternationalPEER HEALTH EXCHANGE INC: $55,000 · Youth DevelopmentGENERATION CITIZEN INC: $15,000 · Youth DevelopmentCommunity Nurse Inc: $40,000 · Health
Other$9,053,500Education$5,627,500Arts & Culture$3,964,400Recreation & Sports$3,600,200Environment$725,000International$410,000Youth Development$70,000Health$40,000

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

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetCENTRAL PARK CONSERVANCY INC: $3,470,200 over 5y, 1.1% of budgetTHE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK: $2,610,000 over 2y, 0.0% of budgetAMERICAN FRIENDS OF LES ARTS FLORISSANTS INC: $1,819,400 over 5y, 33% of budgetTHE LITERARY CLASSICS OF THE US INC D/B/A LIBRARY OF AMERICA: $1,250,000 over 5y, 6.4% of budgetJUILLIARD SCHOOL: $1,235,000 over 5y, 0.3% of budgetThe New York Public Library Astor Lenox and Tilden Foundations: $910,000 over 5y, 0.1% of budgetFRIENDS OF THE HIGH LINE INC: $625,000 over 3y, 1.0% of budgetTHE KING'S ACADEMY: $500,000 over 1y, 1.9% of budgetAMERICAN ACADEMY IN ROME: $400,000 over 4y, 0.7% of budgetFAMILY CENTERS INC: $375,000 over 5y, 0.4% of budgetBUZZARDS BAY COALITION: $345,000 over 5y, 2.0% of budgetHOTCHKISS LIBRARY OF SHARON INC: $250,000 over 1y, 19% of budgetNEW YORKERS FOR PARKS: $200,000 over 4y, 6.5% of budgetOPEN SPACE INSTITUTE INC: $175,000 over 4y, 1.5% of budgetPROSPECT PARK ALLIANCE INC: $130,000 over 4y, 0.4% of budgetSippican Historical Society: $100,000 over 4y, 20% of budgetScripps College: $100,000 over 2y, 0.1% of budgetLJMN Media Inc: $75,000 over 1y, 4.4% of budgetNATURAL AREAS CONSERVANCY INC: $60,000 over 4y, 0.7% of budgetBROOKLYN BOTANIC GARDEN CORPORATION: $60,000 over 4y, 0.1% of budgetTHE TRUSTEES OF RESERVATIONS: $60,000 over 2y, 0.1% of budgetPEER HEALTH EXCHANGE INC: $55,000 over 3y, 0.3% of budgetWORLD MONUMENTS FUND INC: $50,000 over 1y, 0.3% of budgetFRIENDS OF THE UPPER EAST SIDE HISTORIC DISTRICTS INC: $50,000 over 5y, 3.2% of budgetOpening Act Inc: $45,000 over 2y, 2.2% of budgetCommunity Nurse Inc: $40,000 over 4y, 0.1% of budgetOld Dartmouth Historical Society: $30,000 over 3y, 0.1% of budgetSIPPICAN LANDS TRUST INC: $25,000 over 5y, 2.4% of budgetNATIONAL BOOK FOUNDATION INC: $25,000 over 4y, 0.4% of budgetTABOR ACADEMY: $22,500 over 5y, 0.0% of budgetThe English Concert In America Inc co Sabal & Associates: $20,000 over 2y, 3.5% of budgetNEW YORK CITY BALLET INC: $20,000 over 2y, 0.0% of budgetUNITED WAY OF GREATER NEW BEDFORD INC: $20,000 over 4y, 0.2% of budgetPUBLIC AGENDA INC: $20,000 over 1y, 0.5% of budgetGENERATION CITIZEN INC: $15,000 over 1y, 0.3% of budgetFRIENDS OF FONDATION DE FRANCE INC: $10,000 over 1y, 0.1% 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 CENTRAL PARK CONSERVANCY INC ↗
  • Who funds THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK ↗
  • Who funds AMERICAN FRIENDS OF LES ARTS FLORISSANTS INC ↗
  • Who funds THE LITERARY CLASSICS OF THE US INC D/B/A LIBRARY OF AMERICA ↗
  • Who funds JUILLIARD SCHOOL ↗
  • Who funds The New York Public Library Astor Lenox and Tilden Foundations ↗
  • Who funds FRIENDS OF THE HIGH LINE INC ↗
  • Who funds THE KING'S ACADEMY ↗
  • Who funds AMERICAN ACADEMY IN ROME ↗
  • Who funds FAMILY CENTERS INC ↗
  • Who funds BUZZARDS BAY COALITION ↗
  • Who funds HOTCHKISS LIBRARY OF SHARON INC ↗
  • Who funds NEW YORKERS FOR PARKS ↗
  • Who funds OPEN SPACE INSTITUTE INC ↗
  • Who funds PROSPECT PARK ALLIANCE INC ↗
  • Who funds Sippican Historical Society ↗
  • Who funds Scripps College ↗
  • Who funds LJMN Media Inc ↗
  • Who funds NATURAL AREAS CONSERVANCY INC ↗
  • Who funds BROOKLYN BOTANIC GARDEN CORPORATION ↗
  • Who funds THE TRUSTEES OF RESERVATIONS ↗
  • Who funds PEER HEALTH EXCHANGE INC ↗
  • Who funds WORLD MONUMENTS FUND INC ↗
  • Who funds FRIENDS OF THE UPPER EAST SIDE HISTORIC DISTRICTS INC ↗
  • Who funds Opening Act Inc ↗

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.

The Jm Kaplan Fund IncThe New York Communit…The Ludes Family Foun…Willow Creek Charitab…The Hyde and Watson F…The Goldman Sachs Cha…Rockefeller Philanthr…Jewish Communal FundVanguard Charitable E…National Philanthropi…The Blackbaud Giving …Donor Advised Charita…
The Jm Kaplan Fund IncNY17.5× affinity6 shared granteesties to 9 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Jm Kaplan Fund Inc · The New York Community Trust · The Ludes Family Foundation · Willow Creek Charitable Foundation U/A/D 01/11/2002 · The Hyde and Watson Foundation · The Goldman Sachs Charitable Gift Fund · Rockefeller Philanthropy Advisors Inc · Jewish Communal Fund · Vanguard Charitable Endowment Program · National Philanthropic Trust · The Blackbaud Giving Fund · Donor Advised Charitable Giving 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.

How much its grantees rely on government

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

2024
’20’21’22’23’24’25
no gov · 50%3%10%23%40%funder's share of their income ↑0%10%20%30%40%share of the org’s income from government →median 20%
  • Buzzards Bay Coalition: 37% of income from government
  • United Way of Greater New Bedford Inc: 35% of income from government
  • Family Centers Inc: 20% of income from government
  • The Trustees of Reservations: 2% of income from government
  • Old Dartmouth Historical Society: 2% of income from government
no gov moneyreceives it· size = income
5get no government money at all
12report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–40%
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.
05Through Plinth

Warm introductions · Powered by PlinthPlus

How do I get to The Sidney J Weinberg Jr Foundation?

Find your warmest path to The Sidney J Weinberg Jr 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.

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 59 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 2024, released 2024. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Sidney J Weinberg Jr’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