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The McMahon Foundation at a glance

· Private foundation

The McMahon Foundation

Its FY2025 filing reports that it accepted unsolicited grant applications.

$15k
Granted FY2025still arriving
1
Grants FY2025still arriving
1
States reached
$15k
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.

Education$59kPhilanthropy$40kHuman Services$22kArts & Culture$16kAnimals$15kHealth$8kYouth Development$6kRecreation & Sports$5kOther$0
02FY2025 · 1 grant

Where the money goes

Grants by size, and the largest recipients.

$15,000
Median grant
1
States reached
$287k
Total assets
Largest grants
RecipientAmount
SWFL CHILDREN'S CHARITIES INC$15,000
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 (FY18–23, $22k) land where the poverty rate runs at 12%, against an area that typically sits at 12%. 27% of those dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 12%HOPE RISING: $1k → 16%MANSFIELD CARES INC: $2k → 12%MISERICORIDA HOME: $5k → 14%NEW HORIZONS OF SOUTHWEST FLORIDA: $1k → 10%MANSFIELD CARES INC: $2k → 12%THE SHELTER FOR ABUSED WOMEN & CHILDREN: $5k → 10%THE SHELTER FOR ABUSED WOMEN & CHILDREN: $1k → 10%YOUTH HAVEN: $5k → 10%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.

Which US states its grants reach

IL
NY
MA
IN
OH
GA
TX
FL
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.

48%of every dollar goes to organizations it has funded before.
$79k · 4 repeat orgs$87k to everyone else

Grantees it renews have grown median revenue +160% since the first grant, against +52% for those funded once.

4 repeat relationships: 0 still active in FY2025, 4 since wound down; 1 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

4
22

Total granted

$79k
$72k

Median revenue growth · since first grant

+160%
+52%

Still filing today

100%
64%

New vs renewed · share of each year

In FY2025, 0% of grant dollars renewed an existing relationship; $15k went to new ones.

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

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

’18’19’20’21’22’23’24’25
Human ServicesPhilanthropyArts & CultureHealthEducationAnimalsOther
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

  • GN
    GREATER NAPLES AAUW CHARITABLE FOUNDATION INC
    2× · 2020–2021 · $54k · revenue +160% · 45% of their budget
  • NZ
    NAPLES ZOO INC
    2× · 2021–2023 · $15k · revenue +52%
  • THE SHELTER FOR ABUSED WOMEN & CHILDREN INC
    2× · 2021–2023 · $6k · revenue +2%

Funded once

  • NC
    NAPLES CHILDREN FOUNDATION INCgraduated
    one grant, 2023 · $20k · revenue +52%
  • GULFSHORE PLAYHOUSE INCgraduated
    one grant, 2023 · $10k · revenue +90%
  • BB
    BIG BROTHERS BIG SISTERS
    one grant, 2023 · $6k
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
Pediatric Specialty Group Inc

Pediatric specialty group, inc. (d/b/a nicklaus children's pediatric specialists ("ncps")) is a physician-directed, multi-specialty pediatric group with a regional, national, and international presence in providing pediatric-centric care…

—
2
The Hospice Institute of the Florida Suncoast Inc

Suncoast hospice institute is now inactive.

—
3
American Society of Clinical Oncology Inc

See schedule o:asco is a professional oncology society committed to conquering cancer through research, education, and promotion of the highest quality patient care.

Health
4
United States Naval Institute

Provide an independent forum for those who dare to read, think, speak, and write to advance the professional, literary, and scientific understanding of sea power and other issues critical to global security.

—
5
University of New Haven

The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…

Education
6
Johns Hopkins All Children's Hospital Inc

Mission: johns hopkins all children's hospital (all children's), a member of johns hopkins medicine, strives to provide the highest quality care to improve the health of our entire community through innovation, collaboration, service…

Health
7
The Hospice of the Florida Suncoast Inc

Suncoast hospice's mission is to be the center to improve life for those touched by advanced illness, death, dying, grief, bereavement and other end-of-life issues.

Human Services
8
Miami Children's Hospital Research Institute Inc

The NCHRI directly supports the NICKLAUS CHILDREN'S HOSPITAL ("NCH") mission to provide hope through advanced care for our children and families. (CONTINUED ON SCHEDULE O)

—
9
Miami Children's Health System Foundation Inc

The mission of MIAMI CHILDREN'S HEALTH SYSTEM FOUNDATION (D/B/A NICKLAUS CHILDREN'S HOSPITAL FOUNDATION, INC. )is to create awareness and generate funds for Nicklaus Children's Health System (System), Nicklaus Children's Hospital and any…

—
10
Nami Palm Beach County Inc

Nami palm beach county provides advocacy, education, support, and public awareness so that all individuals and families affected by mental illness can build better lives.

Health
11
University of Florida Health Corporation

UF Health's mission is to promote health through outstanding and high-quality patient care, innovative and rigorous education in the health professions and biomedical sciences, and high-impact research across the spectrum of basic,…

—
12
Children's Hospital Corporation

Provider of pediatric healthcare, education, research & community service

Health
How this is measured
The grantee most central to the portfolio’s shape is The Shelter for Abused Women & Children Inc; the most unlike its peers is University of Notre Dame du Lac. 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

21 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. 21 of the 28 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.

1
Load-bearing (≥25% of a budget)
4
Early backer (in before they grew)
20/21
Grantees still filing
14/21
Grew since first funded

Where the money sits, by cause and then by grantee

GREATER NAPLES AAUW CHARITABLE FOUNDATION INC: $54,000 · EducationGREATER NAPLES AAUW CHARITABLE FOUNDATI…University of Notre Dame du Lac: $5,000 · EducationUniversity of Notre Dame du LacNAPLES CHILDREN FOUNDATION INC: $20,250 · PhilanthropyNAPLES CHILDREN FOUNDATI…SWFL CHILDREN'S CHARITIES INC SOUTHWEST FLORIDA WINE & FOOD FEST: $15,000 · PhilanthropySWFL CHILDREN'S CHARITIE…+2 more: $1,200 · PhilanthropyTHE SHELTER FOR ABUSED WOMEN & CHILDREN INC: $6,000 · Human ServicesTHE SHELTER FO…MISERICORDIA HOME: $5,000 · Human ServicesMISERICORDIA H…YOUTH HAVEN INC: $5,000 · Human ServicesYOUTH HAVEN IN…MANSFIELD CARES INC: $4,400 · Human ServicesMANSFIELD CARE…NEW HORIZONS OF SOUTHWEST FLORIDA INC: $1,000 · Human ServicesHope Rising dba Hope Rising Ministries: $1,000 · Human ServicesGULFSHORE PLAYHOUSE INC: $10,000 · Arts & CultureGULFSHORE …OCONEE PERFORMING ARTS SOCIETY INC: $5,000 · Arts & CultureOCONEE PER…GOLISANO CHILDREN'S MUSEUM OF NAPLES INC: $1,250 · Arts & CultureGOLISANO C…NAPLES ZOO INC: $15,000 · AnimalsNAPLES ZO…BIG BROTHERS BIG SISTERS: $5,500 · OtherBIG BROTHE…VICTOR GREEN FOUNDATION: $4,200 · OtherVICTOR GRE…Individual grant recipient: $2,000 · OtherIndividual…Individual grant recipient: $1,100 · OtherIndividual…DOUBLE H HOLE IN THE WOODS RANCH INC: $2,000 · OtherDOUBLE H H…ST MATTHEWS HOUSE INC: $1,036 · OtherST MATTHEW…+3 more: $760 · OtherBLOOD CANCER UNITED INC: $2,500 · HealthAUTISM SPEAKS INC: $2,000 · HealthAMERICAN CANCER SOCIETY INC: $1,000 · Health
Education$59,000Philanthropy$36,450Human Services$22,400Arts & Culture$16,250Animals$15,000Other$16,596Health$5,500

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 budgetGREATER NAPLES AAUW CHARITABLE FOUNDATION INC: $54,000 over 2y, 45% of budgetNAPLES CHILDREN FOUNDATION INC: $20,250 over 1y, 0.1% of budgetNAPLES ZOO INC: $15,000 over 2y, 0.1% of budgetSWFL CHILDREN'S CHARITIES INC SOUTHWEST FLORIDA WINE & FOOD FEST: $15,000 over 1y, 0.5% of budgetGULFSHORE PLAYHOUSE INC: $10,000 over 1y, 0.1% of budgetTHE SHELTER FOR ABUSED WOMEN & CHILDREN INC: $6,000 over 2y, 0.0% of budgetUniversity of Notre Dame du Lac: $5,000 over 1y, 0.0% of budgetMISERICORDIA HOME: $5,000 over 1y, 0.0% of budgetYOUTH HAVEN INC: $5,000 over 1y, 0.1% of budgetMANSFIELD CARES INC: $4,400 over 2y, 1.2% of budgetBLOOD CANCER UNITED INC: $2,500 over 1y, 0.0% of budgetDOUBLE H HOLE IN THE WOODS RANCH INC: $2,000 over 1y, 0.0% of budgetGOLISANO CHILDREN'S MUSEUM OF NAPLES INC: $1,250 over 1y, 0.1% of budgetST MATTHEWS HOUSE INC: $1,036 over 1y, 0.0% of budgetAMERICAN CANCER SOCIETY INC: $1,000 over 1y, 0.0% of budgetTHE IMMOKALEE FOUNDATION INC: $1,000 over 1y, 0.0% of budgetNEW HORIZONS OF SOUTHWEST FLORIDA INC: $1,000 over 1y, 0.0% of budgetHope Rising dba Hope Rising Ministries: $1,000 over 1y, 0.1% of budgetTHE RED SOX FOUNDATION INC: $200 over 1y, 0.0% 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.

National Philanthropi…Vanguard Charitable E…Fidelity Investments …Donor Advised Charita…Amazonsmile Foundation
National Philanthropic TrustPA8.7× affinity4 shared granteesties to 4 of 4Hover any node to trace its alignments.Compare side by side →

Open a dossier: National Philanthropic Trust · Vanguard Charitable Endowment Program · Fidelity Investments Charitable Gift Fund · Donor Advised Charitable Giving Inc · 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 The McMahon Foundation funds: left to right is the share of its income from government, bottom to top the share from The McMahon Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 50%3%13%28%50%funder's share of their income ↑0%3%5%8%10%share of the org’s income from government →median 2%
  • The Red Sox Foundation Inc: 2% of income from government
  • The Shelter for Abused Women & Children Inc: 2% of income from government
  • Gulfshore Playhouse Inc: 0% of income from government
  • Youth Haven Inc: 0% of income from government
no gov moneyreceives it· size = income
5get no government money at all
5report 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 The McMahon Foundation?

Find your warmest path to The McMahon 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 28 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 McMahon’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