New Hampshire · Nonprofit
PROPRIETORS PORTSMOUTH ATHENAEUM
PROPRIETORS PORTSMOUTH ATHENAEUM (New Hampshire) receives grants from 12 organizations whose IRS filings report $287,500 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($119,221). 7 of them have funded it in more than one year, and 87% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $762k
- Funders on record
- 12
- Grants received
- $288k
- Net assets
- $4.1M
What Proprietors Portsmouth Athenaeum does
Mission
The portsmouth athenaeum is a membership library that welcomes all who seek knowledge to experience culture and share in the history of the piscataqua region so that together we may find meaning in the past to illuminate the present and the future.
As stated on its FY2025 Form 990.
Program
2025 was another year of record growth and activity for the athenaeum, which now has more than 600 active members. 2025 statistics: 2,972 in-person visits; 291 telephone queries; 404 email queries; 480 lecture attendants; 450 concert attendants; 371 social event attendants.continued on schedule o
$419,244 spent$3,350 earned by the program100% of program spending
The program described on its FY2025 Form 990. Program spending in total: $419,244.
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 $3.4M to $3.8M (+10%).
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.
52% of PROPRIETORS PORTSMOUTH ATHENAEUM’s revenue is contributions — about as donation-reliant as the typical peer (57% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 1 of the last 9 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 3 funders to 7 funders, grant income fell $45k → $31k.
5 of 12 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 87% 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 PROPRIETORS PORTSMOUTH ATHENAEUM’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
PROPRIETORS PORTSMOUTH ATHENAEUM leans on a few funders — its largest provides 41% of grant income and the top three 89%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
96% 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 PROPRIETORS PORTSMOUTH ATHENAEUM.
Largest funder’s share by year: 2017 81% · 2018 61% · 2019 38% · 2020 59% · 2021 51% · 2022 42% · 2023 44% — 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
71% of PROPRIETORS PORTSMOUTH ATHENAEUM's funders are still giving 3 years after their first grant; 58% 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
87% of PROPRIETORS PORTSMOUTH ATHENAEUM'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 $37k that is directly attributable, 62% of it comes from New Hampshire funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $250k arriving through sponsors registered in 5 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
PROPRIETORS PORTSMOUTH ATHENAEUM runs a healthier operating margin than half of the 16,849 education nonprofits its size.
this organization peer median middle 50% of peers· 16,849 education nonprofits $100k–$1M, FY2025
Organizations like PROPRIETORS PORTSMOUTH ATHENAEUM
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 Hampshire
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
66% of spending goes to programs.
Governance
Public support
68%
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 PROPRIETORS PORTSMOUTH ATHENAEUM: 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 PROPRIETORS PORTSMOUTH ATHENAEUM?
- PROPRIETORS PORTSMOUTH ATHENAEUM (New Hampshire) receives grants from 12 organizations whose IRS filings report $287,500 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($119,221). 7 of them have funded it in more than one year, and 87% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does PROPRIETORS PORTSMOUTH ATHENAEUM have?
- IRS filings report 12 organizations giving $287,500 in grants to PROPRIETORS PORTSMOUTH ATHENAEUM, 7 of which have funded it in more than one year.
- Who is the largest funder of PROPRIETORS PORTSMOUTH ATHENAEUM?
- FIDELITY INVESTMENTS CHARITABLE GIFT FUND is the largest funder on record, with $119,221 in grants. The full list of funders is on this page.
- How can an organization like PROPRIETORS PORTSMOUTH ATHENAEUM find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in New Hampshire. 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 Proprietors Portsmouth Athenaeum →
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 12 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