Massachusetts · Nonprofit
GROTON PUBLIC LIBRARY ENDOWMENT TRUST
GROTON PUBLIC LIBRARY ENDOWMENT TRUST (Massachusetts) receives grants from 4 organizations whose IRS filings report $14,750 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($7,500). 1 of them have funded it in more than one year, and 88% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
Against its field
GROTON PUBLIC LIBRARY ENDOWMENT TRUST runs a healthier operating margin than half of the 3,857 philanthropy nonprofits its size.
this organization peer median middle 50% of peers· 3,857 philanthropy nonprofits $100k–$1M, 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.
- Middlesex Savings Charitable Foundation Inclocalportfolio match
- United Way of North Central Mass Incshared funders
- The Association for Rural and Small Librariesportfolio 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.
18% of GROTON PUBLIC LIBRARY ENDOWMENT TRUST’s revenue is contributions — more earned-revenue than three-quarters of its peers (87% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 8 reported years ran a deficit.
reserve
Who funds it, year by year
2017 → 2023: the base held at 1 funder, grant income fell $8k → $500.
2 of 4 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 88% 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 GROTON PUBLIC LIBRARY ENDOWMENT TRUST’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
GROTON PUBLIC LIBRARY ENDOWMENT TRUST leans on a few funders — its largest provides 51% of grant income and the top three 95%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
88% 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 GROTON PUBLIC LIBRARY ENDOWMENT TRUST.
Largest funder’s share by year: 2017 100% · 2020 100% · 2023 100% — broadly stable.
“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
88% of GROTON PUBLIC LIBRARY ENDOWMENT TRUST's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Of the $2k that is directly attributable, 100% of it comes from Massachusetts funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $13k arriving through sponsors registered in 2 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.
- Middlesex Savings Charitable Foundation Inclocalportfolio matchMA · funds 175 organizations near you · its grantees resemble your mission
- United Way of North Central Mass Incshared fundersMA · backs 12 organizations that share your funders
- The Association for Rural and Small Librariesportfolio matchits grantees resemble your mission
- North Country Library Systemportfolio matchits grantees resemble your mission
- Owwl Library Systemportfolio matchits grantees resemble your mission
- Finger Lakes Library Systemportfolio matchits grantees resemble your mission
- Chautauqua-Cattaraugus Library Systemportfolio matchits grantees resemble your mission
- Marlborough Savings Charitable Foundationportfolio matchits grantees resemble your mission
- The Henry Vincent Couper Charitable Foundationportfolio matchits grantees resemble your mission
- 2006 Edward S Rosenblum Foundationportfolio matchits grantees resemble your mission
- Rollstone Charitable Foundation Incportfolio matchits grantees resemble your mission
- Massachusetts Foundation for the Humanities & Public Policy 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 GROTON PUBLIC LIBRARY ENDOWMENT TRUST
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 Massachusetts
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
89% of spending goes to programs.
Governance
Public support
25%
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 GROTON PUBLIC LIBRARY ENDOWMENT TRUST: 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 GROTON PUBLIC LIBRARY ENDOWMENT TRUST?
- GROTON PUBLIC LIBRARY ENDOWMENT TRUST (Massachusetts) receives grants from 4 organizations whose IRS filings report $14,750 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($7,500). 1 of them have funded it in more than one year, and 88% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does GROTON PUBLIC LIBRARY ENDOWMENT TRUST have?
- IRS filings report 4 organizations giving $14,750 in grants to GROTON PUBLIC LIBRARY ENDOWMENT TRUST, 1 of which have funded it in more than one year.
- Who is the largest funder of GROTON PUBLIC LIBRARY ENDOWMENT TRUST?
- FIDELITY INVESTMENTS CHARITABLE GIFT FUND is the largest funder on record, with $7,500 in grants. The full list of funders is on this page.
- How can an organization like GROTON PUBLIC LIBRARY ENDOWMENT TRUST find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Massachusetts. 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 4funders 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