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Wisconsin · Nonprofit
Castlerock Museum Inc (Wisconsin) is funded by 2 grantmakers whose IRS filings report $493,126 in grants to it, the largest being Castlerock Foundation Inc ($491,876). 2 of them have funded it in more than one year.
Against its field
Castlerock Museum Inc is better cushioned than half of the 16,477 arts & culture nonprofits its size.
this organization peer median middle 50% of peers· 16,477 arts & culture nonprofits $100k–$1M, FY2024
Revenue, expenses and net assets — each indexed to 100 at its first filing year, so you read the trajectory, not the magnitude. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
$500 from 1 funders in 2024, up from $85k and 1 in 2018.
From the IRS filings of Castlerock Museum Inc’s funders (the co-funder graph). Association, not causation.
Castlerock Museum Inc leans on a few funders — its largest provides 100% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
Largest funder’s share by year: 2018 100% · 2019 100% · 2020 100% · 2021 100% · 2022 99% · 2023 100% · 2024 100% — broadly stable.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration.
Castlerock Museum Inc is locally rooted: 100% of its grant income comes from Wisconsin funders.
In-state vs out-of-state, by year
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.
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.
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.
Read directly from this organization’s own Form 990, as neutral context.
Every figure is read directly from IRS Form 990 / 990-PF e-file XML — this organization’s own return for FY2024 (financials across 2018–2024), and the filings of 2funders 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. view filing