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New York · 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.

$13k
Granted FY2024(still arriving)
14
Grants FY2024
19
Organizations funded FY2023
32%
First-time grantees FY2023
Read the full brief
Median grant, FY2024
$500
Largest grant, FY2024
$5,000
Organizations funded a year
7 to 19
FY2017 to FY2023
States reached, FY2024
8
Total assets, FY2024
$175k
Applications
Preselected organizations only
Per its most recent filing; check its own site

How open it is to new grantees

In FY2023, 32% of the organizations The Siff Exkorn Family Foundation Stable Rock Services LLC funded were first-time grantees, receiving 20% of its grant dollars.

New vs renewed · share of each year

In FY2023, 80% of grant dollars renewed an existing relationship; $2k went to new ones.

50%100%’18’19’20’21’22’23
RenewedFirst-time

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

’18’19’20’21’22’23
Arts & CultureHealthHuman ServicesFood & NutritionPublic BenefitCivil RightsOther
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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2024still arriving14$13k21%
FY202319$11k32%
FY202219$16k37%
FY202115$16k20%
FY202014$15k57%
FY20197$23k29%
FY20189$47k44%
FY20178$8kn/a
97% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2024.

Health$112kArts & Culture$12kHuman Services$9kPublic Benefit$6kFood & Nutrition$4kCrime & Legal$2kEducation$1kHousing & Shelter$1kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

IL
MI
NY
MA
NJ
RI
CA
VA
MD
TN
LA

Top grantees

Largest recipients by total granted, FY2017 to FY2024, and the share of each one’s budget the grants supplied at peak.

Show all 26 grantees

What it could do for these grantees

Plus 15 recipients with no EIN on record ($19k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget The Siff Exkorn Family Foundation Stable Rock Services LLC supplied at peak.

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetNext for Autism Inc: $66,800 over 7y, 1.8% of budgetAlpine Learning Group Education Program Inc: $22,500 over 8y, 0.1% of budgetAutism Science Foundation: $9,300 over 8y, 0.2% of budgetOrganization for Autism Research: $7,700 over 6y, 0.1% of budgetWorld Against Toys Causing Harm Inc: $5,700 over 5y, 6.6% of budgetNyack Center: $2,850 over 5y, 0.1% of budgetSoup Angels of Nyack Inc: $1,900 over 4y, 0.1% of budgetArtsrock of Rockland Inc: $1,879 over 4y, 1.0% of budgetCenter for Safety & Change Inc: $1,500 over 1y, 0.0% of budgetFeeding America: $1,500 over 3y, 0.0% of budgetAutism Speaks Inc: $1,500 over 2y, 0.0% of budgetThe New England Center for Children Inc: $1,500 over 3y, 0.0% of budgetBirth Detroit Inc: $675 over 5y, 0.1% of budgetThe Dollywood Foundation: $600 over 4y, 0.0% of budgetPhysicians For Reproductive Health: $550 over 2y, 0.0% of budgetCity Harvest Inc: $507 over 3y, 0.0% of budgetEn Garde Arts Inc: $500 over 1y, 0.1% of budgetFor the Girls Inc: $300 over 3y, 0.0% of budgetUnlocking Autism: $250 over 1y, 0.7% of budgetGay & Sober Inc: $180 over 1y, 0.1% of budgetNew Light Theater Project Inc: $150 over 1y, 0.1% of budgetGravity Water: $100 over 2y, 0.0% of budgetManhattan Class Company Inc: $100 over 1y, 0.0% of budgetRockland Conservatory of Music: $75 over 1y, 0.0% of budgetEnsemble Studio Theatre Inc: $50 over 1y, 0.0% of budget

Tap a dot to name the grantee.

How this is measured
Share of budget is the funder’s grant in a year over the grantee’s total revenue that year, at its highest across the years we hold; revenue is from all sources. Only grantees confirmed against their own filings, whose grants do not exceed their revenue, are plotted: the largest 25.

Nonprofits that may fit its grantmaking

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.

Siff Charitable FoundationMA15.7× affinity5 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

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

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.

Compare The Siff Exkorn Family Foundation Stable Rock Services LLC with peer funders

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.

About The Siff Exkorn Family Foundation Stable Rock Services LLC

How much does The Siff Exkorn Family Foundation Stable Rock Services LLC give?
The Siff Exkorn Family Foundation Stable Rock Services LLC reported 14 grants totaling $13,244 in its FY2024 IRS filing. It funded between 7 and 19 organizations a year over FY2017 to FY2023.
What does The Siff Exkorn Family Foundation Stable Rock Services LLC fund?
By grant dollars over FY2017 to FY2024, its largest causes are Health (75%), Arts & Culture (8%), Human Services (6%).
Who are The Siff Exkorn Family Foundation Stable Rock Services LLC's largest grantees?
By total granted over FY2017 to FY2024: Next for Autism Inc ($67k), Alpine Learning Group Education Program Inc ($23k), Autism Science Foundation ($9k).
Does The Siff Exkorn Family Foundation Stable Rock Services LLC fund new organizations?
In FY2023, 32% of the organizations it funded were first-time grantees.
Does The Siff Exkorn Family Foundation Stable Rock Services LLC accept unsolicited applications?
Its most recent filing reports that it funds preselected organizations and does not take unsolicited requests. Check the foundation's own site before ruling it out.
Which funders back the same organizations as The Siff Exkorn Family Foundation Stable Rock Services LLC?
Its strongest co-funders, measured against what their size predicts, include Siff Charitable Foundation, The Chazen Foundation, Jewish Communal Fund.
Where is The Siff Exkorn Family Foundation Stable Rock Services LLC based?
The Siff Exkorn Family Foundation Stable Rock Services LLC is based in NY.

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 42 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

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