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Mouse King Foundation at a glanceAlso receives grants: funding profile →

· Private foundation

Mouse King Foundation

Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$10k
Granted FY2025still arriving
6
Grants FY2025still arriving
3
States reached
$5k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
01100% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.

Recreation & Sports$45kHealth$36kInternational$7kArts & Culture$6kEnvironment$4kHuman Services$3kAnimals$2k
02FY2025 · 6 grants

Where the money goes

Grants by size, and the largest recipients.

$1,000
Median grant
3
States reached
$156k
Total assets
Largest grants
RecipientAmount
CAMP PA-QUA-TUCK$5,200
MOOSE MOUNTAINS REGIONAL GREENWAYS$1,000
FRIENDS OF SEARS ISLAND$1,000
FRIENDS OF GANONDAGAN$1,000
LAKES REGION CONSERVATION TRUST$1,000
MAINE COAST HERITAGE TRUST$1,000
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Its human-services grants (FY17–23, $33k) land where the poverty rate runs at 7%, against an area that typically sits at 7%. 11% of those dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 7%EAST END HOSPICE: $7k → 7%HELIOS CARE: $3k → 13%EAST END HOSPICE: $6k → 7%HELIOS CARE: $1k → 13%EAST END HOSPICE: $6k → 7%EAST END HOSPICE: $5k → 7%EAST END HOSPICE: $3k → 7%TIMOTHY HILL CHILDREN'S RANCH: $1k → 7%TIMOTHY HILL CHILDREN'S RANCH: $1k → 7%TIMOTHY HILL CHILDREN'S RANCH: $1k → 7%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

90%of every dollar goes to organizations it has funded before.
$93k · 7 repeat orgs$10k to everyone else

Grantees it renews have grown median revenue +98% since the first grant, against 0% for those funded once.

7 repeat relationships: 1 still active in FY2025, 6 since wound down; 5 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

7
1

Total granted

$93k
$5k

Median revenue growth · since first grant

+98%
0%

Still filing today

86%
100%

New vs renewed · share of each year

In FY2025, 51% of grant dollars renewed an existing relationship; $5k went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’17’18’19’20’21’22’23’24’25
Human ServicesEnvironmentInternationalHealthArts & CultureCommunity ImprovementOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). The earliest year is left-censored: relationships that predate the data read as new. Theme is the grantee’s IRS cause.

Backed again, and grew

  • MR
    MORICHES ROTARY HEALTH CAMP INC
    9× · 2017–2025 · $45k · revenue +38%
  • EE
    East End Hospice Inc
    5× · 2019–2023 · $27k · revenue +57%
  • MEDECINS SANS FRONTIERES USA INC
    2× · 2017–2018 · $7k · revenue +98%

Funded once

  • MH
    MA'S HOUSE & BIPOC ART STUDIO INC
    one grant, 2024 · $5k · revenue 0%
How this is measured

Repeat means funded in two or more distinct years. Growth and survival are read from each grantee’s own subsequent IRS filings.

04Its field

Closest unfunded matches

The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.

1
Midcoast Conservancy

The mission of Midcoast Conservancy is to protect vital lands and waters on a scale that matters and to inspire wonder and action on behalf of all species and the Earth.

Environment
2
Mount Desert Land and Garden Preserve

The mission of the mount desert land & garden preserve is to conserve and share the beauty of our historic lands and gardens.

—
3
MaineGeneral Health

To enhance, every day, the health of our patients, our families and our communities. We do that through a range of health care services for people of all ages, in a variety of care settings.

Health
4
Coastal Mountains Land Trust

We conserve land permanently to benefit the natural and human communities of western the Penobscot Bay region.

Environment
5
Maine Appalachian Trail Land Trust

To preserve and protect land surrounding the appalachian trail in maine for public benefit.

Environment
6
Mahoosuc Land Trust Inc

To protect and conserve land and traditional land uses including farming, recreation, significant habitats, scenery, and water resources for the benefit of the public. The organization facilitates community-based conservation.

Environment
7
Massachusetts Land Conservation Trust

Conservation and preservation of land.

Environment
8
Lake George Land Conservancy Inc

Dedicated to permanently preserve the natural, scenic and recreational resources of the Lake George Basin.

Environment
9
Adirondack Mountain Club Inc

Adk is the only non-profit organization in new york state dedicated to the conservation, preservation, and responsible recreational use of the new york state forest preserve and other parks, wild lands, and waters vital to our members and…

Environment
10
Islesboro Islands Trust

The mission of Islesboro Islands Trust is to enhance the quality of residents' lives through the preservation of open space, educate all residents as to the value of the island's natural ecosystems, and act as an environmental advocate on…

Philanthropy
11
Overlook Masonic Health Center Inc

To provide the residents of the health center with the highest level of comprehensive medical care services with a considerate and personal touch.

Health
12
Connecticut Farmland Trust Inc

Protect Connecticuts farmland for agricultural use by purchasing and accepting donations of agricultural conservation easements

Food & Nutrition
How this is measured
The grantee most central to the portfolio’s shape is Medecins Sans Frontieres Usa Inc; the most unlike its peers is Ma's House & Bipoc Art Studio Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
04the grantee network

11 grantees tracked through their own filings, 2017–2025.

Each grant beside the grantee’s revenue from every source, year by year.

How this is measured

Counted here: distinct organizations funded across 2017 to 2025, not grant rows in a single year, so this will not match the grant count on the cover. 11 of the 13 grantees resolved in that span have returns of their own we could reconcile.

Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.

0
Load-bearing (≥25% of a budget)
2
Early backer (in before they grew)
11/11
Grantees still filing
8/11
Grew since first funded

Where the money sits, by cause and then by grantee

MORICHES ROTARY HEALTH CAMP INC: $45,200 · OtherMORICHES ROTARY HEALTH CAMP INCHEIFER PROJECT: $2,000 · Other+1 more: $1,000 · OtherEast End Hospice Inc: $26,500 · Human ServicesEast End Hospice IncCATSKILL AREA HOSPICE AND PALLIATIVE CARE INC DBA HELIOS CARE: $3,500 · Human ServicesCATSKILL AREA HOSPICE AND PALLIATIVE…TIMOTHY HILL CHILDREN'S RANCH INC: $3,000 · Human ServicesTIMOTHY HILL CHILDREN'S RANCH INCMEDECINS SANS FRONTIERES USA INC: $7,000 · InternationalAMYOTROPHIC LATERAL SCLEROSIS ASSN: $6,000 · HealthMA'S HOUSE & BIPOC ART STUDIO INC: $5,000 · Arts & CultureMaine Coast Heritage Trust: $1,000 · EnvironmentMOOSE MOUNTAINS REGIONAL GREENWAYS: $1,000 · EnvironmentLakes Region Conservation Trust: $1,000 · EnvironmentFRIENDS OF GANONDAGAN INC: $1,000 · Community Improvement
Other$48,200Human Services$33,000International$7,000Health$6,000Arts & Culture$5,000Environment$3,000Community Improvement$1,000

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetMORICHES ROTARY HEALTH CAMP INC: $45,200 over 9y, 0.7% of budgetEast End Hospice Inc: $26,500 over 5y, 0.1% of budgetMEDECINS SANS FRONTIERES USA INC: $7,000 over 2y, 0.0% of budgetAMYOTROPHIC LATERAL SCLEROSIS ASSN: $6,000 over 2y, 0.0% of budgetMA'S HOUSE & BIPOC ART STUDIO INC: $5,000 over 1y, 1.6% of budgetCATSKILL AREA HOSPICE AND PALLIATIVE CARE INC DBA HELIOS CARE: $3,500 over 2y, 0.0% of budgetTIMOTHY HILL CHILDREN'S RANCH INC: $3,000 over 3y, 0.0% of budgetLakes Region Conservation Trust: $1,000 over 1y, 0.0% of budgetFRIENDS OF GANONDAGAN INC: $1,000 over 1y, 0.2% of budget
Grantee by grantee: a decade per organization, before and after funding

A decade per grantee: revenue shaded, grants as bars, all rows on one timeline.

Co-funders

Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.

Donor Advised Charita…Fidelity Investments …Amazonsmile Foundation
Donor Advised Charitable Giving IncCO6.5× affinity6 shared granteesties to 2 of 2Hover any node to trace its alignments.Compare side by side →

Open a dossier: Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile Foundation

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization Mouse King Foundation funds: left to right is the share of its income from government, bottom to top the share from Mouse King Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 00%0%1%3%5%funder's share of their income ↑0%3%5%8%10%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get no government money at all
    7report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    ⤢ axis zoomed · 0–10%
    typical government reliance, FY20–25
    How this is measured
    Government income is each org’s traced federal awards (USASpending grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that a grant caused the public funding. Coverage is precision-first, a floor rather than a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12 to 24 months.
    05Through Plinth

    Warm introductions · Powered by PlinthPlus

    How do I get to Mouse King Foundation?

    Find your warmest path to Mouse King Foundation through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.

    Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.

    On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 13 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

    How this is measured
    Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

    Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

    Source object · view filing

    Play a game based on Mouse King’s filings →

    More from the funding graph

    The unnamed billions
    grants reported with no recipient in the public record
    The regranting layer
    51% of grant dollars land in the regranting layer
    The DAF merry-go-round
    $9.7B circulates between donor-advised funds
    The endowment market
    who holds foundation money, and what just moved
    The camps
    funders cluster by geography, not ideology
    By state
    where grant money is based, and what stays home