Connecticut · Nonprofit
WINCHESTER HISTORICAL SOCIETY
WINCHESTER HISTORICAL SOCIETY (Connecticut) receives grants from 2 organizations whose IRS filings report $18,500 to it, the largest being CONNECTICUT TRUST FOR HISTORIC PRESERVATION INC ($10,000). 1 of them have funded it in more than one year.
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.
- Connecticut Humanities Council Incshared fundersportfolio match
- Paine Richmond P Tr Uwshared funders
- New Hampshire Preservation Allianceportfolio 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.
Who funds it, year by year
2017 → 2019: the base broadened from 1 funder to 2 funders, grant income rose $2k → $13k.
From the IRS filings of WINCHESTER HISTORICAL SOCIETY’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
WINCHESTER HISTORICAL SOCIETY leans on a few funders — its largest provides 54% 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
54% 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 WINCHESTER HISTORICAL SOCIETY.
Largest funder’s share by year: 2017 100% · 2018 100% · 2019 80% — 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.
Where its funders are
100% of WINCHESTER HISTORICAL SOCIETY's grant income comes from Connecticut funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. 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.
- Connecticut Humanities Council Incshared fundersportfolio matchCT · backs 62 organizations that share your funders · its grantees resemble your mission
- Paine Richmond P Tr Uwshared fundersTX · backs 3 organizations that share your funders
- New Hampshire Preservation Allianceportfolio matchits grantees resemble your mission
- Northwest Connecticut Community Foundation Incshared funderslocalCT · backs 16 organizations that share your funders · funds 177 organizations near you
- Greater Hudson Heritage Networkportfolio matchits grantees resemble your mission
- Arthur Griffin Family Foundationportfolio matchits grantees resemble your mission
- The William G Pomeroy Foundationportfolio matchits grantees resemble your mission
- Leo Cox Beach Philanthropic Foundportfolio matchits grantees resemble your mission
- The Order of Colonial Lords of Manors in Americaportfolio matchits grantees resemble your mission
- Heritage Harbor Foundationportfolio matchits grantees resemble your mission
- Massachusetts Society of the Cincinnatiportfolio matchits grantees resemble your mission
- New Hampshire Humanities Councilportfolio 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 WINCHESTER HISTORICAL SOCIETY
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 Connecticut
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Screen this organization
A dated, signed PDF of the compliance screen for WINCHESTER HISTORICAL SOCIETY: 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 WINCHESTER HISTORICAL SOCIETY?
- WINCHESTER HISTORICAL SOCIETY (Connecticut) receives grants from 2 organizations whose IRS filings report $18,500 to it, the largest being CONNECTICUT TRUST FOR HISTORIC PRESERVATION INC ($10,000). 1 of them have funded it in more than one year.
- How many funders does WINCHESTER HISTORICAL SOCIETY have?
- IRS filings report 2 organizations giving $18,500 in grants to WINCHESTER HISTORICAL SOCIETY, 1 of which have funded it in more than one year.
- Who is the largest funder of WINCHESTER HISTORICAL SOCIETY?
- CONNECTICUT TRUST FOR HISTORIC PRESERVATION INC is the largest funder on record, with $10,000 in grants. The full list of funders is on this page.
- How can an organization like WINCHESTER HISTORICAL SOCIETY find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Connecticut. 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 FY2024 (financials across 2017–2024), 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. 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