Seidenberg Family Foundation
At a glance
This funder does not accept unsolicited applications. The foundation chooses the organisations it funds itself.
Key takeaways
- The foundation does not accept unsolicited requests, and its filings describe contributions only to preselected charitable organisations, so a small charity without an invitation should not send an application.
- Its stated purposes are broad and no geographic focus is stated, but medical research takes the largest share of its grant dollars and education is another substantial area, so work in those fields is the clearest fit.
- About 8 in 10 of its grants fall between $100 and $130,000 and the median grant is $1,800, so a modest request is most in line with its past giving, although its largest grant was $2,000,000.
- Funding is heavily repeat: 99% of its grant dollars to organisations in its most recent filing went to organisations it had also funded in one of the two filings before it, so existing relationships matter far more than a cold approach.
- The filings give no submission steps or deadlines, so there is no timing to plan around beyond building that relationship first.
Overview
Seidenberg Family Foundation is a US private foundation based in New York, NY.
What they fund
Profile based on the foundation's IRS Form 990-PF filings (TY2024, TY2023, TY2022) only: no website or other web source for the foundation was found. Every statement is checked against the filings. Sources read on 7 October 2026.
Priority Areas
The foundation's filed grants support medical research and education. Other stated purposes include community activity, civic and civil work, religious organisations, healthcare, relief, arts and human services. Its recipients include hospitals, universities and schools, medical-research and disease organisations, community groups, religious organisations, and charities working in relief, animal welfare and the arts. Medical research accounts for the largest recorded share of grant dollars, and education is another substantial area of giving. The filings show support across several kinds of organisations and purposes, rather than a single beneficiary or a narrowly defined field. They do not state detailed eligibility criteria or a public application route.
Themes
From its grants, not stated by the foundation:
- Medical research
- Education
Geographic Focus
No geographic focus is stated; the filings show grants mainly in New York.
How to apply
The filing describes contributions only to preselected charitable organisations and says unsolicited requests are not accepted. It gives no applicant submission steps.
Application success factors
- Repeat giving: In its TY2024 filing, 99% of its grant dollars to organisations went to organisations it had also funded in its TY2022 or TY2023 filing.
- Grant size: Across its TY2022, TY2023 and TY2024 filings, half of its 100 grants to organisations were $1,800 or less.
Where grants go
From grants to organisations in the foundation’s filings for tax years 2022–2024.
Grant dollars by state
6 other states: <1%
- The largest single recipient received 35% of grant dollars to organisations.
- In tax year 2024, 100% of grant dollars went to organisations Seidenberg Family Foundation had funded in earlier filings.
- No grants were paid directly to organisations outside the US.
- 5% of grant dollars went to intermediaries that regrant to other organisations.
Grants
How much do they typically give?
Share of 31 grants in tax year 2024 by size
Median $1,000 (tax year 2024)
The largest grants to organisations in the foundation’s latest filing:
- Memorial Sloan Kettering · Research/medical$701,5002024 tax year
- Trustees of Columbia University · Education$229,3002024 tax year
- Beyond Celiac · Medical research$90,2002024 tax year
- Boys & Girls Club of Northern Westchester · Educatiom/community$50,0002024 tax year
- Cornell University · Education$40,0002024 tax year
- Uja Rockland · Religious$37,5002024 tax year
- Temple Beth Shalom · General$25,0002024 tax year
- Jupiter Medical Center · General$15,0002024 tax year
Grants to organisations listed in the foundation’s Form 990-PF filings. Grants to individuals are not shown.
Officers and directors
- Lisa Agdern — Executive Director
- Douglas Seidenberg — Board Member
- Phyllis Seidenberg — Board Member
- Ivan Seidenberg — Chairman of the Board
From the latest Form 990-PF filing
3 years of tax filings
| Year | Total expenses | Grants paid | Assets | Filing document |
|---|---|---|---|---|
| 2022 tax year | $1,652,017 | $1,448,960 | $20,983,213 | Filing for 2022 tax year |
| 2023 tax year | $4,033,070 | $3,826,727 | $19,149,542 | Filing for 2023 tax year |
| 2024 tax year | $1,566,760 | $1,224,634 | $20,028,380 | Filing for 2024 tax year |
Figures from the foundation’s IRS Form 990-PF filings. Assets are at fair market value at year end. The document icon links to each year’s filing on ProPublica Nonprofit Explorer.
Sources
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At a glance
Applying to Seidenberg Family Foundation?
Hinchilla drafts your answers around this funder's priorities, using your organisation's own documents.
No credit card required
Contact
- New York, NY
Applying to Seidenberg Family Foundation?
Hinchilla drafts your answers around this funder's priorities, using your organisation's own documents.
No credit card required
Contact
- New York, NY