· Private foundation
Siff Charitable 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.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2017–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k29 grants · $34k
- $10k–50k4 grants · $69k
| Recipient | Amount |
|---|---|
| UMASS CHAN MEDICAL SCHOOL FOUNDATION | $26,600 |
| NEW YORK UNIVERSITY | $15,000 |
| WOODSTOCK FILM FESTIVAL | $15,000 |
| NEXT FOR AUTISM | $12,000 |
| ALPINE LEARNING CENTER | $5,000 |
| UMASS MEMORIAL FOUNDATION | $5,000 |
| TEMPLE EMANUEL SINAI | $3,400 |
| WORCESTER ART MUSEUM | $2,500 |
| AUTISM PROJECT OF PALM BEACH COUNTY | $2,500 |
| TIBETAN HOME OF HOPE | $2,500 |
| EN GUARDE ARTS | $2,200 |
| WATCH RESOURCES INC | $2,000 |
| JEWISH HEALTH CARE CENTER | $1,600 |
| BREAST CANCER RESEARCH FOUNDATION | $1,500 |
| FLORIDA ATLANTIC UNIVERSITY | $1,000 |
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.
Your human-services grants (FY17–25, $35k) land where the poverty rate runs at 11%, against an area that typically sits at 8%. 100% of those 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 +40% since the first grant, against +8% for the ones you funded once.
54 repeat relationships — 21 still active in FY2025, 33 since wound down; 11 grantees were first funded in FY2025 (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 FY2025, 79% of grant dollars renewed an existing relationship; $22k 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
- NYNew York University6× · 2020–2025 · $70k · revenue +45%
- APAUTISM PROJECT OF PALM BEACH COUNTY INC9× · 2017–2025 · $23k · revenue +306%
- HIHerizon Inc7× · 2017–2023 · $19k · revenue +29%
Funded once
- FFFoundation for Neurologic Diseases Incone grant, 2021 · $10k · revenue -39%
- IGIndividual grant recipientone grant, 2024 · $10k
- CACHILDREN'S AID FOUNDATION OF CANADAone grant, 2022 · $5k
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 mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
Wpi transforms lives, turns knowledge into action to confront global challenges, and revolutionizes stem through distinctive and inclusive education, projects and research. (http://www.wpi.edu/about/mission.html)
Wentworth institute of technology is a nationally recognized private coeducational and residential university of higher education with a mission to empower, inspire and innovate through experiential learning with a core purpose of career…
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…
Organization's mission: boston university is an international, comprehensive, private research university, committed to educating students to be reflective, resourceful individuals ready to live, adapt, and lead in an interconnected world.…
Wheaton college provides a transformative liberal arts education, combining theory and practice, for intellectually curious students within a collaborative and vibrant extended community and network that values and strives to create an…
Whitehead institute forges new frontiers in science, uncovering insights today that unlock the potential of tomorrow. our advances in genetics and genomics are now enabling us to tackle the complexities of life with unprecedented depth and…
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.
The mission of the institute is to translate basic genetic and molecular mechanisms of schizophrenia and related developmental brain disorders into clinical advances that change the lives of affected individuals. it is catalyzing a new…
Western new england university, a comprehensive private institution with a tradition of excellence in teaching and scholarship and a commitment to service, awards undergraduate, master's, and doctoral degrees in various departments from…
The Marine Biological Laboratory (MBL) is a world-renowned center for biological discovery and training that is notably affiliated with more than 60 Nobel Prize winners. Research is conducted by full-time faculty as well as hundreds of the…
For reference, the grantee most central to the portfolio’s shape is Next for Autism Inc and the most unlike its peers is The National World War Ii Museum 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 38 years old; the field is 16. You back the established end — and your money leans older still.
The field is 22% startups (under 5 years old) — 2% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 1% lost their exemption, against 13% 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.
61 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. 61 of the 117 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 JEWISH FEDERATION OF CENTRAL MASSACHUSETTS INC ↗
- Who funds New York University ↗
- Who funds NEXT FOR AUTISM INC ↗
- Who funds AUTISM PROJECT OF PALM BEACH COUNTY INC ↗
- Who funds Herizon Inc ↗
- Who funds Dana-Farber Cancer Institute Inc ↗
- Who funds WOODSTOCK FILM FESTIVAL INC ↗
- Who funds WORCESTER ART MUSEUM ↗
- Who funds Foundation for Neurologic Diseases Inc ↗
- Who funds JEWISH HEALTHCARE CENTER INC ↗
- Who funds THE BREAST CANCER RESEARCH FOUNDATION INC ↗
- Who funds MORSELIFE FOUNDATION INC ↗
- Who funds WORLD AGAINST TOYS CAUSING HARM INC ↗
- Who funds WORCESTER NATURAL HISTORY SOCIETY INC ↗
- Who funds TRUSTEES OF CLARK UNIVERSITY ↗
- Who funds BROWN UNIVERSITY ↗
- Who funds NAMI PALM BEACH COUNTY INC ↗
- Who funds GULFSHORE PLAYHOUSE INC ↗
- Who funds NATIONAL JEWISH HEALTH ↗
- Who funds BRANDEIS UNIVERSITY ↗
- Who funds THE FILMMAKERS COLLABORATIVE INC ↗
- Who funds ALZHEIMER'S DRUG DISCOVERY FOUNDATION ↗
- Who funds EN GARDE ARTS INC ↗
- Who funds WILLIAM JAMES COLLEGE INC ↗
- Who funds WATCH RESOURCES INC ↗
- Who funds AUTISM SPEAKS 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: Melvin S Cutler Charitable Foundation · Ruth H & Warren a Ellsworth Foundation · Schwartz Charitable Foundation · Greater Worcester Community Foundation Inc · Community Foundation for Palm Beach and Martin Counties Inc · Combined Jewish Philanthropies of Greater Boston Inc · Joseph Persky Foundation · The Siff Exkorn Family Foundation Stable Rock Services LLC · Mildred H McEvoy Foundation · The Fred Harris Daniels Foundation · The Fletcher Foundation · Stoddard Charitable Trust
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 Siff Charitable 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.
- Greater Lowell Community Foundation Inc — 18% of income from government
- Jewish Healthcare Center Inc — 15% of income from government
- William James College Inc — 11% of income from government
- Gulf Stream Council of Boy Scouts of America Inc — 9% of income from government
- Brandeis University — 9% of income from government
- Worcester Natural History Society Inc — 8% of income from government
- Music Worcester Inc — 7% of income from government
- Dana-Farber Cancer Institute Inc — 7% of income from government
- Worcester Chamber Music Society Inc — 5% of income from government
- Worcester Historical Museum — 5% of income from government
- Worcester State Foundation Inc — 3% of income from government
- Trustees of Clark University — 2% of income from government
- Special Olympics Massachusetts Inc — 1% of income from government
- Worcester Art Museum — 1% of income from government
- The Filmmakers Collaborative Inc — 1% of income from government
- Jacob's Pillow Dance Festival Inc — 1% of income from government
- Goucher College — 0% of income from government
- Gulfshore Playhouse Inc — 0% of income from government
- Pan-Massachusetts Challenge Inc — 0% of income from government
- TrustBridge Inc — 0% of income from government
- South Florida Pbs Inc — 0% 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
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Find your warmest path to Siff Charitable 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.