New York · Nonprofit
NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER
NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER (New York) receives grants from 25 organizations whose IRS filings report $833,082 to it, the largest being THE ROTHENBERG LUDDEN TRUST ($275,000). 14 of them have funded it in more than one year.
Against its field
NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER is better cushioned than half of the 881 environment nonprofits its size.
this organization peer median middle 50% of peers· 881 environment nonprofits $1M–$10M, FY2025
Three funders worth looking at
Grantmakers with no record of funding this organization, ranked by how strongly the co-funder graph and the mission embeddings agree. The evidence is in section 03.
- Louis and Anne Abrons Foundation Incshared funders
- The Topfield Foundation Incportfolio match
- Schumann Robert F Fdn-Mainportfolio match
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.
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 37% · 2018 36% · 2019 38% · 2020 56% · 2021 36% · 2022 25% · 2023 34% · 2024 33% · 2025 26%. Grants only. Government contracts and fees sit inside program revenue.
58% of NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER’s revenue is contributions — more earned-revenue than three-quarters of its peers (88% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 9 reported years ran a deficit.
reserve
Who funds it, year by year
2017 → 2023: the base broadened from 2 funders to 11 funders, grant income rose $26k → $185k.
5 of 25 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 13% 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 NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER’s funders (the co-funder graph). 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
NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER leans on a few funders — its largest provides 33% of grant income and the top three 76%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
Largest funder’s share by year: 2017 98% · 2018 45% · 2019 31% · 2020 59% · 2021 47% · 2022 31% · 2023 51% — diversifying over time.
“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 NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER's funders are still giving 3 years after their first grant; 56% 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
92% of NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER'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. $106k arriving through sponsors registered in 4 statesis 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.
Funders to approach
Grantmakers that don’t fund you yet, surfaced two ways: they back organizations that share your funders, or their grantees resemble your mission. The ones both signals agree on come first. Your 25 funders put you under-funded among the 400 organizations that share them.
- Louis and Anne Abrons Foundation Incshared fundersDE · backs 60 organizations that share your funders
- The Topfield Foundation Incportfolio matchits grantees resemble your mission
- Schumann Robert F Fdn-Mainportfolio matchits grantees resemble your mission
- Joseph and Joan Cullman Conservation Foundation Incportfolio matchits grantees resemble your mission
- Overhills Foundationportfolio matchits grantees resemble your mission
- The White Pine Fundportfolio matchits grantees resemble your mission
- National Environmental Education and Training Foundation Incportfolio matchits grantees resemble your mission
- Swantz Family Foundationportfolio matchits grantees resemble your mission
- Open Space Institute Incportfolio matchits grantees resemble your mission
- The Wildwood Foundationportfolio matchits grantees resemble your mission
- The Sigmund Cohn Family Foundation Incportfolio matchits grantees resemble your mission
- Mabee Family Foundation Incportfolio matchits grantees resemble your mission
From the co-funder graph (funders backing at least two comparable organizations, shrunk for grantee count, donor-advised and mega-funds excluded) and the universe embeddings. A research starting point; overlap is association, not a guarantee of fit.
Organizations like NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER
Nonprofits whose mission and program text most resemble this one, by semantic similarity over the universe of 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
82% of spending goes to programs.
Governance
Public support
76%
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 NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER: 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. How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER?
- NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER (New York) receives grants from 25 organizations whose IRS filings report $833,082 to it, the largest being THE ROTHENBERG LUDDEN TRUST ($275,000). 14 of them have funded it in more than one year.
- How many funders does NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER have?
- IRS filings report 25 organizations giving $833,082 in grants to NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER, 14 of which have funded it in more than one year.
- Who is the largest funder of NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER?
- THE ROTHENBERG LUDDEN TRUST is the largest funder on record, with $275,000 in grants. The full list of funders is on this page.
- How can an organization like NUNATAKS LTD D/B/A GREENBURGH NATURE CENTER 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.
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 25funders 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 August 27, 2026. What this page cannot tell you · view filing