· Private foundation
The Siff Exkorn Family Foundation Stable Rock Services LLC
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 clustered by its grantee’s IRS cause code (NTEE), by year — across FY2017–2024.
Where the money goes
Your grants by size, and where they go.
| Recipient | Amount |
|---|---|
| ALPINE LEARNING GROUP | $5,000 |
| NEXT FOR AUTISM | $3,000 |
| ORGANIZATION FOR AUTISM RESEARCH | $1,100 |
| AUTISM SCIENCE FOUNDATION | $1,100 |
| FEEDING AMERICA | $500 |
| NYACK CENTER | $500 |
| EN GARDE ARTS | $500 |
| NEW ENGLAND CENTER FOR CHILDREN | $500 |
| ARTS ROCK OF ROCKLAND | $379 |
| B STREET THEATRE | $150 |
| BIRTH DETROIT | $150 |
| CITY HARVEST | $150 |
| PROSPECTPARKORG | $115 |
| I SUPPORT THE GIRLS | $100 |
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 (FY20–24, $4k) land where the poverty rate runs at 14%, against an area that typically sits at 12%. 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 +32% since the first grant, against 0% for the ones you funded once.
20 repeat relationships — 11 still active in FY2024, 9 since wound down; 3 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, 94% of grant dollars renewed an existing relationship; $765 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
- ALALPINE LEARNING GROUP EDUCATION PROGRAM INC8× · 2017–2024 · $23k · revenue +27%
- ASAUTISM SCIENCE FOUNDATION8× · 2017–2024 · $9k · revenue +167%
ORGANIZATION FOR AUTISM RESEARCH6× · 2018–2024 · $8k · revenue +35%
Funded once
- FCFILMMAKERS COLLABORATIVEone grant, 2018 · $3k
- EHEDWARD HOPPER HOUSEone grant, 2022 · $2k
- CFCENTER FOR SAFETY & CHANGE INCone grant, 2021 · $2k · revenue +14%
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.
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.
Producing and developing plays and musicals.
Amid the proliferation of advice about treatment options for autism, the ability to access accurate information about research-validated approaches is critically important to those seeking effective treatment.
The organization seeks to accomplish its purpose by advocating with employers to include individuals with autism spectrum diagnoses in their diversity and inclusion initiatives; educating employers about the business benefits of hiring…
N of One aims to create breakthroughs in autism by focusing on emerging areas such as the microbiome, immune system, and mitochondrial cell metabolism. We take a venture capital appproach by supporting both innovative academic researchers…
Nassau suffolk services for the autistic (nssa) offers hope to people with autism and their families by providing high quality life-long support through services which enable people with autism to function better in everday life. nssa…
The mission of nyc autism charter schools is to provide individualized, scientifically based educational services to children with autism and other pervasive development disorders.
The production of theater for and with disabled and marginalized artists. also the creation of NY theatrical standards.
At Atlantic, our aim is singular: to empower simple and honest storytelling that fosters greater understanding of our shared world. Across our work, we are a family of artists dedicated to exploring essential truths onstage, be it a show…
The new group is an artist-driven company with a commitment to developing and producing powerful, contemporary theater. while constantly evolving, we maintain an ensemble approach to all our work and an articulated style of emotional…
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…
Wp theater is the nation's oldest and largest theater company dedicated to developing, producing, and promoting the work of women+ at every stage of their careers. for over four decades we have served as leaders of a global movement…
For reference, the grantee most central to the portfolio’s shape is Next for Autism Inc and the most unlike its peers is Soup Angels of Nyack 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 32 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) — 4% of your grantees by number, and just 2% of your money.
The orgs you fund almost never close — 4% 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.
26 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. 26 of the 42 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 NEXT FOR AUTISM INC ↗
- Who funds ALPINE LEARNING GROUP EDUCATION PROGRAM INC ↗
- Who funds AUTISM SCIENCE FOUNDATION ↗
- Who funds ORGANIZATION FOR AUTISM RESEARCH ↗
- Who funds WORLD AGAINST TOYS CAUSING HARM INC ↗
- Who funds NYACK CENTER ↗
- Who funds Soup Angels of Nyack Inc ↗
- Who funds ARTSROCK OF ROCKLAND INC ↗
- Who funds THE NEW ENGLAND CENTER FOR CHILDREN INC ↗
- Who funds Feeding America ↗
- Who funds CENTER FOR SAFETY & CHANGE INC ↗
- Who funds AUTISM SPEAKS INC ↗
- Who funds BROWN UNIVERSITY ↗
- Who funds BIRTH DETROIT INC ↗
- Who funds THE DOLLYWOOD FOUNDATION ↗
- Who funds Physicians For Reproductive Health ↗
- Who funds CITY HARVEST INC ↗
- Who funds EN GARDE ARTS INC ↗
- Who funds For the Girls Inc ↗
- Who funds UNLOCKING AUTISM ↗
- Who funds GAY & SOBER INC ↗
- Who funds New Light Theater Project Inc ↗
- Who funds GRAVITY WATER ↗
- Who funds MANHATTAN CLASS COMPANY 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: Siff Charitable Foundation · The Chazen Foundation · Jewish Communal Fund · The Bank of America Charitable Foundation Inc · The Pfizer Foundation Inc · American Endowment Foundation · The Blackbaud Giving Fund · Network for Good · National Philanthropic Trust · Vanguard Charitable Endowment Program · American Online Giving Foundation Inc · Fidelity Investments Charitable Gift Fund
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 Siff Exkorn Family Foundation Stable Rock Services LLC 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.
- The New England Center for Children Inc — 3% 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 The Siff Exkorn Family Foundation Stable Rock Services LLC?
Find your warmest path to The Siff Exkorn Family Foundation Stable Rock Services LLC 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.