· 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.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2020–2024.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2024
- Under $10k6 grants · $29k
- $10k–50k13 grants · $185k
- $50k–250k7 grants · $710k
- $250k+6 grants · $4.8M
| Recipient | Amount |
|---|---|
| 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 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Dollar for dollar, your grants (FY20–24) land where the poverty rate runs at 16%, against an area that typically sits at 11%. 90% of your dollars go to grantees based in above-average-need neighborhoods. Most of your grants land in higher-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
Which US states your grants reach
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
And the relationships you keep tend to grow: grantees you re-up on have seen median revenue of +54% since the first grant, against +27% for the ones you 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
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2024, 78% of grant dollars renewed an existing relationship; $1.2M went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). 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
- CPCENTRAL PARK CONSERVANCY INC5× · 2020–2024 · $3.5M · revenue +167%
- AFAMERICAN FRIENDS OF LES ARTS FLORISSANTS INC5× · 2020–2024 · $1.8M · revenue +66% · 33% of their budget
- TLTHE LITERARY CLASSICS OF THE US INC D/B/A LIBRARY OF AMERICA5× · 2020–2024 · $1.3M · revenue +6%
Funded once
- HBHARVARD BUSINESS SCHOOLone grant, 2020 · $750k
- TKTHE KING'S ACADEMYgraduatedone grant, 2022 · $500k · revenue +27%
- HLHOTCHKISS LIBRARY OF SHARON INCone grant, 2021 · $250k · revenue -44%
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
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…
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…
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.
The conservancy preserves and revitalizes new york's architecture. by doing so, it contributes to new york's economy, tourism and quality of life.
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.
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.
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…
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)
To educate students to be ethical and socially responsible leaders in a global community.
To preserve the unique character and natural resources of harvard.
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."
For reference, the grantee most central to the portfolio’s shape is The New York Public Library Astor Lenox and Tilden Foundations and 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.
Your grantees are a median of 48 years old; the field is 16. You back the established end — and your money leans older still.
The field is 20% startups (under 5 years old) — 0% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 11% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
36 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, 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; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your 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 Scripps College ↗
- Who funds Sippican Historical Society ↗
- Who funds LJMN Media Inc ↗
- Who funds THE TRUSTEES OF RESERVATIONS ↗
- Who funds NATURAL AREAS CONSERVANCY INC ↗
- Who funds BROOKLYN BOTANIC GARDEN CORPORATION ↗
- Who funds PEER HEALTH EXCHANGE INC ↗
- Who funds FRIENDS OF THE UPPER EAST SIDE HISTORIC DISTRICTS INC ↗
- Who funds WORLD MONUMENTS FUND INC ↗
- Who funds Opening Act Inc ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
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
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization The Sidney J Weinberg Jr Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal, a single department, or state — and drag the year to watch it move.
- 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
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 your grant caused the public funding. Coverage is precision-first — a floor, not 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 12–24 months.
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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.