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Mainwaring Family Foundation at a glance

· Private foundation

Mainwaring Family 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.

$197k
Granted FY2025still arriving
10
Grants FY2025still arriving
1
States reached
$65k
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, FY2020 to 2025.

Arts & Culture$613kEnvironment$193kFood & Nutrition$72kHealth$44kEducation$15kHousing & Shelter$12kInternational$10kPhilanthropy$5kOther$0
02FY2025 · 10 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k2 grants · $13k
  • $10k–50k7 grants · $119k
  • $50k–250k1 grant · $65k
$12,000
Median grant
1
States reached
$19M
Total assets
Largest grants
RecipientAmount
HELENA SYMPHONY$65,000
HOLTER MUSEUM OF ART$45,000
AMERICAN PRAIRIE FOUNDATION$15,000
PRICKLY PEAR LAND TRUST$15,000
HELENA FOOD SHARE$12,000
MONTANA FOOD BANK NETWORK$12,000
PLANNED PARENTHOOD OF MONTANA$10,000
GLACIER TWO MEDICINE ALLIANCE$10,000
OMERTA ARTS SYNDICATE$7,538
H-TOWN EAGLES BOXING CLUB$5,000
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:

Dollar for dollar, its grants (FY20–25) land where the poverty rate runs at 10%, against an area that typically sits at 9%. 96% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 9%HELENA SYMPHONY: $70k → 9%MONTANA FOOD BANK NETWORK: $12k → 9%PLANNED PARENTHOOD OF MONTANA: $10k → 9%GLACIER TWO MEDICINE ALLIANCE: $15k → 26%THE CONOCOCHEAGUE INSTITUTE: $5k → 9%FRIENDS OF NOTRE-DAME DE PARIS: $5k → 14%THE NATURE CONSERVANCY: $10k → 7%HOLTER MUSEUM OF ART: $70k → 9%MONTANA FOOD BANK NETWORK: $12k → 9%PLANNED PARENTHOOD OF MONTANA: $10k → 9%GLACIER TWO MEDICINE ALLIANCE: $10k → 26%THE CONOCOCHEAGUE INSTITUTE: $5k → 9%THE NATURE CONSERVANCY: $10k → 7%HELENA SYMPHONY: $65k → 9%MONTANA FOOD BANK NETWORK: $10k → 9%PLANNED PARENTHOOD OF MONTANA: $10k → 9%GLACIER TWO MEDICINE ALLIANCE: $10k → 26%HELENA SYMPHONY: $65k → 9%GLACIER TWO MEDICINE ALLIANCE: $10k → 26%HELENA SYMPHONY: $65k → 9%HOLTER MUSEUM OF ART: $45k → 9%HOLTER MUSEUM OF ART: $45k → 9%HELENA SYMPHONY: $40k → 9%HOLTER MUSEUM OF ART: $40k → 9%HOLTER MUSEUM OF ART: $40k → 9%HELENA SYMPHONY: $30k → 9%HOLTER MUSEUM OF ART: $30k → 9%HELENA FOOD SHARE: $16k → 9%HELENA FOOD SHARE: $12k → 9%HELENA FOOD SHARE: $10k → 9%OMERTA ARTS SYNDICATE: $8k → 9%H-TOWN EAGLES BOXING CLUB: $5k → 9%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.

97%of every dollar goes to organizations it has funded before.
$915k · 12 repeat orgs$33k to everyone else

Grantees it renews have grown median revenue +30% since the first grant, against +28% for those funded once.

12 repeat relationships: 8 still active in FY2025, 4 since wound down; 2 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

12
3

Total granted

$915k
$20k

Median revenue growth · since first grant

+30%
+28%

Still filing today

83%
100%

New vs renewed · share of each year

In FY2025, 94% of grant dollars renewed an existing relationship; $13k went to new ones.

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

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

’20’21’22’23’24’25
EnvironmentArts & CultureFood & NutritionEducationHousing & ShelterInternationalOther
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

  • HM
    HOLTER MUSEUM OF ART
    6× · 2020–2025 · $270k · revenue +15%
  • AP
    AMERICAN PRAIRIE FOUNDATION
    5× · 2020–2025 · $60k · revenue +180%
  • PP
    PRICKLY PEAR LAND TRUST
    6× · 2020–2025 · $58k · revenue +152%

Funded once

  • HE
    HELENA EDUCATION FOUNDATIONgraduated
    one grant, 2021 · $10k · revenue +28%
  • FO
    FRIENDS OF NOTRE-DAME DE PARIS INC
    one grant, 2021 · $5k · revenue -61%
  • TA
    THE ANGEL FUNDgraduated
    one grant, 2023 · $5k · revenue +35%
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
The Montana Land Reliance

The mission of the montana land reliance (mlr) is to partner with landowners to provide permanent protection for private lands that are significant for agricultural production, fish and wildlife habitat, and open space.

Environment
2
Minnesota Land Trust

The minnesota land trust protects and restores minnesota's most vital natural lands in order to provide wildlife habitat, clean water, outdoor experiences and scenic beauty for generations to come.

Environment
3
Colorado Museum of Natural History

Be a catalyst! Ignite our community's passion for nature and science.

Arts & Culture
4
Eastern National

Eastern national promotes the public's understanding and support of america's national parks and other public trust partners by providing quality educational experiences, products and services.

Recreation & Sports
5
Maine Appalachian Trail Land Trust

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

Environment
6
Eden Peopleplanet

To offer the dignity of fair employment to people living in impoverished communities, who become transformational agents of global forest restoration.

International
7
Montana State Parks Foundation

The montana state parks foundation raises private support to enhance the visitors experience and build advocates for montanas state parks and recreation heritage.

Recreation & Sports
8
McKenzie River Trust

Acquire and manage land and conservation easements through purchase and donation to ensure long term conservation of clean water, fish and wildlife habitat, and other community values.

Environment
9
Flathead Land Trust

Flathead land trust is dedicated to the conservation of northwest montana's land and water legacy through voluntary agreements with private land owners. flt's primary program service is private land conservation through voluntary…

Environment
10
The National Park Service Employee and Alumni Trust Fund

Foster, maintain and improve the morale of nps employees and to promote close ties with current nps members and nps alumni.

—
11
Confluence Public Health Alliance

None

Health
12
Amazon Conservation Association

Amazon conservation unites science, people, and innovation to protect the amazon - the greatest wild forest on earth. as guardians of the most iconic forest on the planet, we bring together the power of the latest science and technology…

Environment
How this is measured
The grantee most central to the portfolio’s shape is Prickly Pear Land Trust; the most unlike its peers is The Glacier-Two Medicine Alliance. 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

14 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. 14 of the 18 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)
14/14
Grantees still filing
11/14
Grew since first funded

Where the money sits, by cause and then by grantee

HELENA SYMPHONY: $335,000 · OtherHELENA SYMPHONYTHE NATURE CONSERVANCY: $20,000 · OtherNATIONAL ALLIANCE ON MENTAL ILLNESS: $13,547 · Other+4 more: $27,538 · Other+4 moreHOLTER MUSEUM OF ART: $270,000 · Arts & CultureHOLTER MUSEUM OF ARTConococheague Institute For the Study of Cultural Heritage: $10,000 · Arts & CultureAMERICAN PRAIRIE FOUNDATION: $60,000 · EnvironmentAMERICAN PRAIRIE FO…PRICKLY PEAR LAND TRUST: $57,500 · EnvironmentPRICKLY PEAR LAND T…THE GLACIER-TWO MEDICINE ALLIANCE: $45,000 · EnvironmentTHE GLACIER-TWO MED…HELENA FOOD SHARE INC: $38,112 · Food & NutritionMONTANA FOOD BANK NETWORK INC: $34,000 · Food & NutritionIntermountain Planned Parenthood: $30,000 · HealthHELENA EDUCATION FOUNDATION: $10,000 · EducationTHE ANGEL FUND: $5,000 · EducationPOVERELLO CENTER INC: $12,000 · Housing & Shelter
Other$396,085Arts & Culture$280,000Environment$162,500Food & Nutrition$72,112Health$30,000Education$15,000Housing & Shelter$12,000

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 budgetHOLTER MUSEUM OF ART: $270,000 over 6y, 15% of budgetAMERICAN PRAIRIE FOUNDATION: $60,000 over 5y, 0.1% of budgetPRICKLY PEAR LAND TRUST: $57,500 over 6y, 0.3% of budgetTHE GLACIER-TWO MEDICINE ALLIANCE: $45,000 over 4y, 6.7% of budgetHELENA FOOD SHARE INC: $38,112 over 3y, 0.2% of budgetMONTANA FOOD BANK NETWORK INC: $34,000 over 3y, 0.0% of budgetIntermountain Planned Parenthood: $30,000 over 3y, 0.2% of budgetTHE NATURE CONSERVANCY: $20,000 over 2y, 0.0% of budgetPOVERELLO CENTER INC: $12,000 over 2y, 0.2% of budgetConococheague Institute For the Study of Cultural Heritage: $10,000 over 2y, 2.4% of budgetMEDECINS SANS FRONTIERES USA INC: $10,000 over 2y, 0.0% of budgetHELENA EDUCATION FOUNDATION: $10,000 over 1y, 2.7% of budgetFRIENDS OF NOTRE-DAME DE PARIS INC: $5,000 over 1y, 0.0% of budgetTHE ANGEL FUND: $5,000 over 1y, 2.0% 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.

Montana Community Fou…First Interstate Banc…Treacy FoundationDennis & Phyllis Wash…Cordingley FoundationHelena Area Community…Speyer Family Foundat…Town Pump Charitable …M J Murdock Charitabl…Annie E Casey Foundat…American Endowment Fo…Morgan Stanley Global…
Montana Community Foundation IncMT21.8× affinity8 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Montana Community Foundation Inc · First Interstate BancSystem Foundation Inc · Treacy Foundation · Dennis & Phyllis Washington Foundation · Cordingley Foundation · Helena Area Community Foundation · Speyer Family Foundation · Town Pump Charitable Foundation · M J Murdock Charitable Trust · Annie E Casey Foundation Inc · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc

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 Mainwaring Family Foundation funds: left to right is the share of its income from government, bottom to top the share from Mainwaring Family Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 00%1%4%8%15%funder's share of their income ↑0%13%25%38%50%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get no government money at all
    4report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    ⤢ axis zoomed · 0–50%
    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 Mainwaring Family Foundation?

    Find your warmest path to Mainwaring Family 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 18 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 Mainwaring Family’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