· 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.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2020–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k2 grants · $13k
- $10k–50k7 grants · $119k
- $50k–250k1 grant · $65k
| Recipient | Amount |
|---|---|
| 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 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Dollar for dollar, your grants (FY20–25) land where the poverty rate runs at 10%, against an area that typically sits at 9%. 96% of your dollars go to grantees based in above-average-need neighborhoods. Most of your grants land in higher-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
And the relationships you keep tend to grow: grantees you re-up on have seen median revenue of +30% since the first grant, against +28% for the ones you 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
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2025, 94% of grant dollars renewed an existing relationship; $13k went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). 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
- HMHOLTER MUSEUM OF ART6× · 2020–2025 · $270k · revenue +15%
- APAMERICAN PRAIRIE FOUNDATION5× · 2020–2025 · $60k · revenue +180%
- PPPRICKLY PEAR LAND TRUST6× · 2020–2025 · $58k · revenue +152%
Funded once
- HEHELENA EDUCATION FOUNDATIONgraduatedone grant, 2021 · $10k · revenue +28%
- FOFRIENDS OF NOTRE-DAME DE PARIS INCone grant, 2021 · $5k · revenue -61%
- TATHE ANGEL FUNDgraduatedone grant, 2023 · $5k · revenue +35%
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
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.
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.
Be a catalyst! Ignite our community's passion for nature and science.
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.
To preserve and protect land surrounding the appalachian trail in maine for public benefit.
To offer the dignity of fair employment to people living in impoverished communities, who become transformational agents of global forest restoration.
The montana state parks foundation raises private support to enhance the visitors experience and build advocates for montanas state parks and recreation heritage.
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.
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…
Foster, maintain and improve the morale of nps employees and to promote close ties with current nps members and nps alumni.
None
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…
For reference, the grantee most central to the portfolio’s shape is Prickly Pear Land Trust and 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.
14 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, 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; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.
- Who funds HOLTER MUSEUM OF ART ↗
- Who funds AMERICAN PRAIRIE FOUNDATION ↗
- Who funds PRICKLY PEAR LAND TRUST ↗
- Who funds THE GLACIER-TWO MEDICINE ALLIANCE ↗
- Who funds HELENA FOOD SHARE INC ↗
- Who funds MONTANA FOOD BANK NETWORK INC ↗
- Who funds Intermountain Planned Parenthood ↗
- Who funds THE NATURE CONSERVANCY ↗
- Who funds POVERELLO CENTER INC ↗
- Who funds Conococheague Institute For the Study of Cultural Heritage ↗
- Who funds MEDECINS SANS FRONTIERES USA INC ↗
- Who funds HELENA EDUCATION FOUNDATION ↗
- Who funds FRIENDS OF NOTRE-DAME DE PARIS INC ↗
- Who funds THE ANGEL FUND ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
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
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization Mainwaring Family Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal or a single department — and drag the year to watch it move.
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 your grant caused the public funding. Coverage is precision-first — a floor, not 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 12–24 months.
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.