New York · Nonprofit
LONGHOUSE RESERVE
LONGHOUSE RESERVE (New York) receives grants from 110 organizations whose IRS filings report $4,262,920 to it, the largest being JOSEPH & SYLVIA SLIFKA FOUNDATION INC ($1,250,000). 63 of them have funded it in more than one year.
- Revenue FY2024
- $2.0M
- Funders on record
- 110
- Grants received
- $4.3M
- Net assets
- $9.5M
What Longhouse Reserve does
Mission
Longhouse Reserve inspires living with art in all forms. Founded by jack lenor larsen, its collections, gardens, art and programs reflect world cultures.
As stated on its FY2024 Form 990.
Program
In 2024, Longhouse Reserve was open to the public from all year, weekends january-march and five-days a week april through december. Annual attendance was approximately 35,000, including school groups, garden tours, and special programs. The season featured new loans to the art in the garden program. Longhouse held regular art and garden tours. Other public programs in 2024 included our annual summer benefit, jack's birthday concert, our annual landscape lecture weekend, and longhouse illuminated, our winter holiday light show. In addition to these special events, our calendar was full of artist talks, author talks, workshops, and family activities. Education programs included docent-led school tours, curricular guides, family activity guides, and summer internships for college students. In addition, 2024 continued the transition to a board and staff led institution (following the death of jack lenor larsen in 2020), with new board members and staff members joining. Longhouse entered two major processes: a change of use (residential to multi-use) with the town of east hampton with the goal of opening the house for public tours; and an application to be listed on the national…
$1,640,141 spent$367,312 earned by the program100% of program spending
The program described on its FY2024 Form 990. Program spending in total: $1,640,141.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2020 to 2021, from $7.3M to $11M (+55%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2017 1% · 2018 1% · 2019 1% · 2020 7% · 2021 2% · 2022 2% · 2023 0% · 2024 1%. Grants only. Government contracts and fees sit inside program revenue.
72% of LONGHOUSE RESERVE’s revenue is contributions — more donation-reliant than the typical peer (48% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 5 of the last 8 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Who funds it, year by year
2017 → 2023: the base broadened from 23 funders to 31 funders, grant income rose $268k → $333k.
12 of 110 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 30% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of LONGHOUSE RESERVE’s funders (the co-funder graph). Top 30 of 110 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
LONGHOUSE RESERVE has a broad base — no single funder exceeds 29% of grant income, and it takes 4 funders to reach half.
the vertical line marks half of all grant income — 4 funders to its left
30% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund LONGHOUSE RESERVE.
Largest funder’s share by year: 2017 17% · 2018 28% · 2019 22% · 2020 15% · 2021 75% · 2022 21% · 2023 23% — growing more concentrated.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
30% of LONGHOUSE RESERVE's funders are still giving 3 years after their first grant; 57% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
86% of LONGHOUSE RESERVE's grant income comes from New York funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $1.3M arriving through sponsors registered in 8 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
LONGHOUSE RESERVE's funding base is broadening — from 23 funders to 31 as grant income climbed.
this organization peer median middle 50% of peers· 11,752 education nonprofits $1M–$10M, FY2024
Organizations like LONGHOUSE RESERVE
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In New York
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
73% of spending goes to programs.
Governance
Public support
66%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for LONGHOUSE RESERVE: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds LONGHOUSE RESERVE?
- LONGHOUSE RESERVE (New York) receives grants from 110 organizations whose IRS filings report $4,262,920 to it, the largest being JOSEPH & SYLVIA SLIFKA FOUNDATION INC ($1,250,000). 63 of them have funded it in more than one year.
- How many funders does LONGHOUSE RESERVE have?
- IRS filings report 110 organizations giving $4,262,920 in grants to LONGHOUSE RESERVE, 63 of which have funded it in more than one year.
- Who is the largest funder of LONGHOUSE RESERVE?
- JOSEPH & SYLVIA SLIFKA FOUNDATION INC is the largest funder on record, with $1,250,000 in grants. The full list of funders is on this page.
- How can an organization like LONGHOUSE RESERVE find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in New York. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Longhouse Reserve →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2024 (financials across 2017–2024), and the filings of 110 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing