The Siff Exkorn Family Foundation Stable Rock Services LLC
The Siff Exkorn Family Foundation is a private foundation based in New York, NY. Its 2024 filing lists contributions to charitable organizations, including autism-related organizations, community and arts organizations, and organizations addressing food access and maternal care.
The Siff Exkorn Family Foundation Stable Rock Services LLC at a glance
In short: The Siff Exkorn Family Foundation Stable Rock Services LLC gave $13K across 14 grants in 2024 (avg $946), top state New York. 21% of 2024 grantees were new. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $13,244
- +18.2% vs 2023
- Grants made (2024)
- 14
- -26.3% vs 2023
- Average grant
- $946
- +60.4% vs 2023
- Median grant
- $500
- Total assets
- $174,742
- +0.5% vs 2023
- New grantees (estimate)
- 21% first-time grantees (3 of 14, 2024; small sample)
- Primary geography
- New York (43% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to The Siff Exkorn Family Foundation Stable Rock Services LLC
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation does not accept unsolicited requests for funds and states that it makes contributions only to preselected charitable organizations.
- Contact
Mailing address: 2 West 45Th Street Ste 1208, New York, NY 10036
Phone: (212) 382-3939
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who The Siff Exkorn Family Foundation Stable Rock Services LLC funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
The largest 2024 recipient was Alpine Learning Group ($5K). Together the top 10 received $13K.
Grant Size Distribution
82 grants across all recorded years
The most common grant size was under $50K: 82 grants of 82 (100%).
Geographic Focus
Where this funder awards grants
The 2024 grants went to organizations in several states. By share of grant dollars, New York received 43%, New Jersey 38%, Virginia 8%, Massachusetts 4%, and Illinois 4%. Listed recipients were also located in Michigan and California.
Grant Distribution by State
Share of 2024 grant dollars across all 14 itemized grants.
States
Cities
Is The Siff Exkorn Family Foundation Stable Rock Services LLC open to new grantees?
21%
first-time grantees, 2024
In 2024, 3 of 14 grantees (21%) were first-time recipients. With only 14 grantees, that is a small sample: one grantee more or less moves the share by about 7 points. First grants averaged $255; repeat grants $1K. How we count
Medians: $150 first-time, $500 repeat.
- 64% of 2024 grantees were also funded in 2023. Method
- Giving held roughly steady from 2021 to 2024 (−15%). Method
- In 2024 it paid out well above its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2024). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $11K (2023) to $17K (2022). In 2024 it made 14 grants totaling $13K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Alpine Learning Group Paramus, NJ | Donation | $5,000 |
| Next for Autism New York, NY | Donation | $3,000 |
| Autism Science Foundation New York, NY | Donation | $1,100 |
| Organization for Autism Research Arlington, VA | Donation | $1,100 |
| Nyack Center Nyack, NY | Donation | $500 |
| New England Center for Children Southborough, MA | Donation | $500 |
| Feeding America Chicago, IL | Donation | $500 |
| En Garde Arts Brooklyn, NY | Donation | $500 |
| Arts Rock of Rockland Nyack, NY | Donation | $379 |
| Birth Detroit Detroit, MI | Donation | $150 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2024 | $174,742 | $17,742 | $16,788 | $13,244 | 14 | $13,244 | $11,380 | $559 |
| 2023 | $173,788 | $1,493 | $14,262 | $11,205 | 19 | $11,205 | $8,889 | $589 |
| 2022 | $191,417 | $9,033 | $20,697 | $16,927 | 20 | $16,927 | $9,033 | $660 |
| 2021 | $198,221 | $28,619 | $16,809 | $15,510 | 15 | $15,510 | $26,047 | $452 |
| 2020 | $186,411 | $11,832 | $17,740 | $14,610 | 14 | — | $11,435 | $606 |
Under IRS private-foundation payout rules, The Siff Exkorn Family Foundation Stable Rock Services LLC reported a distributable amount of $559 for 2024 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2024 grants show support for organizations working in areas including autism services and research, community programs, theatre and arts, food access, and maternal care. For example, Next for Autism says it designs and supports programs for people with autism; the Organization for Autism Research says it funds research and provides evidence-based information about autism; and the Autism Science Foundation says it supports autism research and public awareness.
Other 2024 recipients describe their work as community-building and services (Nyack Center), theatre experiences intended to foster empathy and dialogue (En Garde Arts), equitable access to nutritious food (Feeding America), and care through pregnancy, birth, and beyond (Birth Detroit).
Grantmaking
In 2024, the foundation gave $13,244 through 14 grants. Grant amounts ranged from $100 to $5,000, with a median grant of $500. Its largest listed grants were $5,000 to Alpine Learning Group, $3,000 to Next for Autism, and $1,100 each to the Autism Science Foundation and the Organization for Autism Research.
Other listed recipients included Nyack Center ($500), New England Center for Children ($500), Feeding America ($500), En Garde Arts ($500), Arts Rock of Rockland ($379), Birth Detroit ($150), City Harvest ($150), and B Street Theatre ($150).
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists Karen A Siff-Exkorn, Franklin E Exkorn, Robert M Siff, Shirley S Siff, and Nathan Greenberg as trustees.
The Siff Exkorn Family Foundation Stable Rock Services LLC's 2024 filing lists 5 officers; none of the 5 officers listed in 2024 report compensation.
Officers on the 2024 filing
Franklin E. Exkorn
Trustee As N
On filings since 2020
No compensation reported
Karen A. Siff-Exkorn
Trustee As N
On filings since 2020
No compensation reported
Nathan Greenberg
Trustee As N
On filings since 2020
No compensation reported
Robert M. Siff
Trustee As N
On filings since 2020
No compensation reported
Shirley S. Siff
Trustee As N
On filings since 2020
No compensation reported
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about The Siff Exkorn Family Foundation Stable Rock Services LLC
How much does The Siff Exkorn Family Foundation Stable Rock Services LLC give each year?
The Siff Exkorn Family Foundation Stable Rock Services LLC gave $13K across 14 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $11K across 19 grants.
What is The Siff Exkorn Family Foundation Stable Rock Services LLC's typical grant size?
The Siff Exkorn Family Foundation Stable Rock Services LLC's median grant in 2024 was $500, and its average grant was $946, across 14 grants on its 2024 IRS Form 990-PF. Organizations receiving their first grant from The Siff Exkorn Family Foundation Stable Rock Services LLC that year got $255 on average.
Where does The Siff Exkorn Family Foundation Stable Rock Services LLC give grants?
The Siff Exkorn Family Foundation Stable Rock Services LLC's top state is New York, with 43% of the grant dollars itemized on its 2024 IRS Form 990-PF. The next largest states were New Jersey (38%) and Virginia (8%). The most frequent recipient cities were Brooklyn, NY (3 grants), New York, NY (2 grants) and Nyack, NY (2 grants).
Does The Siff Exkorn Family Foundation Stable Rock Services LLC give general operating support?
Not in 2024: none of the 14 grants with a stated purpose on The Siff Exkorn Family Foundation Stable Rock Services LLC's 2024 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Donation" (14 grants).
Who are The Siff Exkorn Family Foundation Stable Rock Services LLC's largest grantees?
The Siff Exkorn Family Foundation Stable Rock Services LLC's largest 2024 grantees include Alpine Learning Group ($5,000), Next for Autism ($3,000) and Autism Science Foundation ($1,100), according to its 2024 IRS Form 990-PF. Together they received 69% of its itemized 2024 grant dollars.
How large is The Siff Exkorn Family Foundation Stable Rock Services LLC?
The Siff Exkorn Family Foundation Stable Rock Services LLC reported $175K in total assets on its 2024 IRS Form 990-PF. It paid out $13K in qualifying distributions that year, against a required minimum of $559 (roughly 5% of its investment assets).
What does The Siff Exkorn Family Foundation Stable Rock Services LLC fund?
No mission statement for the foundation is provided. Its 2024 grants show support for organizations working in areas including autism services and research, community programs, theatre and arts, food access, and maternal care. See mission & focus areas ↑
How do I apply for a grant from The Siff Exkorn Family Foundation Stable Rock Services LLC?
The foundation does not accept unsolicited requests for funds and states that it makes contributions only to preselected charitable organizations. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is The Siff Exkorn Family Foundation Stable Rock Services LLC's EIN?
The Siff Exkorn Family Foundation Stable Rock Services LLC's EIN (Employer Identification Number) is 42-1612887. IRS Form 990 filing data is available on this page for 2020–2024.
Does The Siff Exkorn Family Foundation Stable Rock Services LLC accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS November 15, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS November 15, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS November 14, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS November 13, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS November 13, 2025)
- IRS filings on file for fiscal years 2020–2024
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