· Private foundation
Jaf 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 FY2017–2024.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2024
- Under $10k12 grants · $33k
- $10k–50k6 grants · $130k
- $50k–250k2 grants · $197k
| Recipient | Amount |
|---|---|
| ETH FOUNDATION | $140,000 |
| SOUTH FORK NATURAL HISTORY MUSEUM | $57,000 |
| PESTALOZZI US CHILDRENS CHARITY INC | $45,000 |
| BYRD HOFFMAN WATERMILL FOUNDATION | $30,000 |
| SOUTHAMPTON ARTS CENTER | $25,000 |
| SOUTHAMPTON ROSE SOCIETY | $10,000 |
| GABRIELLES ANGELS FOUNDATION | $10,000 |
| Syracuse University College of Law | $10,000 |
| The Opera Foundation | $5,000 |
| Individual grant recipient | $2,500 |
| NEW YORK YACHT CLUB FOUNDATION | $2,500 |
| SAG HARBOR VILLAGE POLICE | $2,500 |
| SAG HARBOR FIRE DEPARTMENT | $2,500 |
| FIGHTING CHANCE | $2,500 |
| Heart of The Hamptons | $2,500 |
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.
Your human-services grants (FY17–21, $15k) land where the poverty rate runs at 7%, against an area that typically sits at 11%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-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 +38% since the first grant, against +29% for the ones you funded once.
31 repeat relationships — 20 still active in FY2024, 11 since wound down.
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, 100% of grant dollars renewed an existing relationship; $0 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
- SISCOA INC7× · 2017–2024 · $610k · revenue +95%
ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI3× · 2020–2023 · $500k · revenue +39%- SFSOUTH FORK NATURAL HISTORY SOCIETY8× · 2017–2024 · $385k · revenue +29%
Funded once
- DBDAVID BROWER CENTERgraduatedone grant, 2017 · $50k · revenue +41%
- PCPROSTATE CANCER FOUNDATIONone grant, 2021 · $50k · revenue +7%
- BHBILL HILLARY & CHELSEA CLINTON FOUNDATIONgraduatedone grant, 2018 · $25k · revenue +58%
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.
Provide an independent forum for those who dare to read, think, speak, and write to advance the professional, literary, and scientific understanding of sea power and other issues critical to global security.
The nantucket conservation foundation owns, protects, and stewards over 9,000 acres of land and coastal shoreline, conserves nantucket's rare and significant natural resources, and engages in impactful ecological research to inform…
The mission of the organization is to achieve international recognition of the importance of the Sargasso Sea and to develop protection measures for it through competent regional and international organizations.
South shore university hospital is part of northwell health ("northwell"), which strives to improve the health of the communities it serves and is committed to providing the highest quality clinical care; educating the current and future…
To preserve the unique character and natural resources of harvard.
Peconic Public Broadcasting is a public FM radio station located in Southampton, New York. The station services Long Island and coastal Connecticut and offers listeners both national and local programs.
To manage the brooklyn navy yard for the city of new york, specifically to expand job opportunities for new yorkers by fostering the development of small businesses.
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 governors island corporation, doing business as the trust for governors island, is the 501(c)(3) not-for-profit organization created by the city of new york and charged with the planning, redevelopment and ongoing operations of 150…
As a designated national and state heritage area, susquehanna heritage corporation works to raise awareness and appreciation of the cultural and economic value of the susquehanna riverlands, and preserve, enhance and celebrate the area's…
Support and foster growth of the south street seaport museum via loans of collections to the museum for exhibit.
The suny maritime foundation, inc. is the primary organization to raise and manage private financial support for suny maritime college. this support assists suny maritime to achieve its mission and vision while at the same time enriching…
For reference, the grantee most central to the portfolio’s shape is The Southampton Hospital Foundation Inc and the most unlike its peers is Dana-Farber Cancer Institute Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 27 years old; the field is 18. You back the established end — and your money leans older still.
The field is 19% startups (under 5 years old) — 0% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 3% lost their exemption, against 10% 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.
31 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. 31 of the 46 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 BYRD HOFFMAN WATER MILL FOUNDATION ↗
- Who funds SCOA INC ↗
- Who funds ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI ↗
- Who funds SOUTH FORK NATURAL HISTORY SOCIETY ↗
- Who funds PESTALOZZI US CHILDRENS CHARITY INC ↗
- Who funds IYRS SCHOOL OF TECHNOLOGY & TRADES INC ↗
- Who funds SOUTHAMPTON YOUTH SERVICES INC ↗
- Who funds SYRACUSE UNIVERSITY ↗
- Who funds DAVID BROWER CENTER ↗
- Who funds PROSTATE CANCER FOUNDATION ↗
- Who funds HEART OF THE HAMPTONS LTD ↗
- Who funds The Opera Foundation Inc ↗
- Who funds FIGHTING CHANCE INC ↗
- Who funds BILL HILLARY & CHELSEA CLINTON FOUNDATION ↗
- Who funds AMERICAN PASTIME ↗
- Who funds NEW YORK YACHT CLUB FOUNDATION ↗
- Who funds SOUTHAMPTON ROSE SOCIETY ↗
- Who funds UNCOMMONORG INC ↗
- Who funds SAG HARBOR PARTNERSHIP INC ↗
- Who funds THE SOUTHAMPTON HOSPITAL FOUNDATION INC ↗
- Who funds ANIMAL RESCUE FUND OF THE HAMPTONS INC ↗
- Who funds SOUTHAMPTON SOCCER CLUB ↗
- Who funds OCEANA INC ↗
- Who funds SAG HARBOR FIRE DEPARTMENT INC ↗
- Who funds ONE TREE PLANTED INC ↗
- Who funds WORTHLESS FOUNDATION INC ↗
- Who funds SOUTHAMPTON ASSOCIATION 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 New York Community Trust · Gardner Cowles III Charitable Foundation · Audrey and Martin Gruss Foundation · Martin D & Jean Shafiroff Foundation · Earle I Mack Foundation Inc · Andrew Sabin Family Foundation · Jewish Communal Fund · National Philanthropic Trust · Morgan Stanley Global Impact Funding Trust Inc · Vanguard Charitable Endowment Program · The Bank of America Charitable Foundation Inc · 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 Jaf 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 or a single department — and drag the year to watch it move.
- Dana-Farber Cancer Institute Inc — 7% 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.
Warm introductions · Powered by PlinthPlus
How do I get to Jaf Foundation?
Find your warmest path to Jaf 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.