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William and Mary Ross Foundation at a glance

· Private foundation

William and Mary Ross Foundation

Its FY2024 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$775k
Granted FY2024still arriving
15
Grants FY2024still arriving
3
States reached
$250k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0195% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2020 to 2024.

Education$2.4MHuman Services$314kReligion$279kArts & Culture$255kYouth Development$216kHealth$196kFood & Nutrition$190kAnimals$145kOther$0
02FY2024 · 15 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2024

  • Under $10k2 grants · $9k
  • $10k–50k9 grants · $240k
  • $50k–250k3 grants · $276k
  • $250k+1 grant · $250k
$25,000
Median grant
3
States reached
$11M
Total assets
Largest grants
RecipientAmount
CALVARY CHAPEL CHRISTIAN SCHOOLS$250,000
ST JOHN XXII CATHOLIC SCHOOL COMMUNITY$116,000
MAGNOLIA PROJECT$80,000
UNIVERSITY OF ARIZONA FOUNDATION$80,000
ASSISTANCE LEAGUE OF TUCSON$35,420
TUCSON FESTIVAL OF BOOKS$35,000
ST JOHN SOUTH CATHOLIC$30,000
TUCSON CONQUISTADORES FOUNDATION$25,000
SALPOINTE CATHOLIC EDUCATION FOUNDATION$25,000
HUMANE SOCIETY OF SOUTHERN ARIZONA$25,000
TMC FOUNDATION$25,000
CORONADO HOSPITAL FOUNDATION$25,000
SALVATION ARMY$15,000
ST AUGUSTINE CATHOLIC HIGH SCHOOL$5,000
ST THOMAS THE APOSTLE$3,800
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 (FY20–24, $140k) land where the poverty rate runs at 15%, against an area that typically sits at 10%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 10%ST LUKE'S HOME: $20k → 15%ST LUKE'S HOME: $10k → 15%EMERGE CENTER AGAINST DOMESTIC ABUSE: $25k → 15%EMERGE CENTER AGAINST DOMESTIC ABUSE: $25k → 15%ASSISTANCE LEAGUE OF TUCSON: $35k → 15%YOUTH ON THEIR OWN: $25k → 15%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
WI
NY
IN
OH
CA
KY
AZ
SC
DC
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.

77%of every dollar goes to organizations it has funded before.
$3.4M · 29 repeat orgs$1.0M to everyone else

Grantees it renews have grown median revenue +30% since the first grant, against +27% for those funded once.

29 repeat relationships: 10 still active in FY2024, 19 since wound down; 5 grantees were first funded in FY2024 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

29
36

Total granted

$3.4M
$861k

Median revenue growth · since first grant

+30%
+27%

Still filing today

52%
56%

New vs renewed · share of each year

In FY2024, 77% of grant dollars renewed an existing relationship; $175k went to new ones.

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

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

’20’21’22’23’24
HealthEducationHuman ServicesYouth DevelopmentFood & NutritionPhilanthropyOther
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

  • University of Arizona Foundation
    5× · 2020–2024 · $495k · revenue +54%
  • CR
    CRISTO REY NETWORK
    3× · 2020–2022 · $137k · revenue +66%
  • TF
    TUCSON FESTIVAL OF BOOKS
    2× · 2022–2024 · $100k · revenue +89%

Funded once

  • CC
    Catholic Community Services of Southern Arizona Incgraduated
    one grant, 2020 · $120k · revenue +32%
  • TV
    TUCSON VALUES TEACHERS
    one grant, 2021 · $100k · revenue -13%
  • HC
    HOLTZ CHARITABLE FOUNDATION INC
    one grant, 2020 · $50k · revenue -1%
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
Arizona Latin-American Medical Association
Unclassified
2
Arizona Healthiest State Foundation
—
3
Tucson Scottish Rite Charitable Foundation
—
4
The Dons of Arizona
Education
5
Phoenix Children's Hospital Foundation

Phoenix children's hospital foundation supports phoenix children's hospital through fundraising ensuring that the hospital continues to stay on the leading edge of pediatric medicine and is equipped to fulfill its mission to advance hope,…

Health
6
Society of St Vincent de Paul Tucson

The mission of SSVDP is to promote the spiritual growth of its members through prayer, friendship, and service to others.

Religion
7
Social Venture Partners Tucson

Svp tucson is an ever expanding community of engaged philanthropists dedicated to building the capacity, strength and impact of nonprofits in addressing social problems. we accomplish this through: thoughtful and strategic investments and…

Philanthropy
8
Honorhealth

Honorhealth's mission is to improve the health and well-being of those we serve.

Health
9
Vitalyst Health Foundation

To connect, support and inform efforts to improve the health of individuals and communities in arizona.

Health
10
Cancer Support Community Arizona

CSCAZ uplifts and strengthens people impacted by cancer by providing support, fostering compassionate communities, and breaking down barriers to care.

Health
11
Arizona-Sonora Desert Museum

We inspire people to live in harmony with the natural world by fostering love, appreciation, and understanding of the sonoran desert.

Arts & Culture
12
United Way of Tucson and Southern Arizona Inc

Our vision is a community where every child receives a high-quality education from birth to career, every adult has the opportunity to thrive financailly and in the workplace, and every older person can retire and age with dignity and…

Philanthropy
How this is measured
The grantee most central to the portfolio’s shape is Casa De Los Ninos; the most unlike its peers is Holtz Charitable Foundation 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

39 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. 39 of the 71 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)
9
Early backer (in before they grew)
39/39
Grantees still filing
27/39
Grew since first funded

Where the money sits, by cause and then by grantee

CALVARY CHAPEL CHRISTIAN SCHOOLS: $896,995 · OtherCALVARY CHAPEL CHRISTIAN SCHOOLSST JOHN XXII CATHOLIC SCHOOL COMMUNITY: $427,227 · OtherST JOHN XXII CATHOLIC SCHOOL COMMUNITYBOYS & GIRLS CLUB: $130,000 · OtherSALPOINTE CATHOLIC HIGH SCHOOL EDUCATION FOUNDATION: $127,000 · OtherGOSPEL RESCUE MISSION INC: $125,000 · OtherCatholic Community Services of Southern Arizona Inc: $120,000 · Other+44 more: $1,174,536 · Other+44 moreUniversity of Arizona Foundation: $495,000 · EducationUniversity of Arizo…CRISTO REY NETWORK: $137,000 · EducationCRISTO REY NETWORKMAGNOLIA GLOBAL ACADEMY FOR LEADERS: $80,000 · EducationMAGNOLIA GLOBAL ACA…THE CATHOLIC UNIVERSITY OF AMERICA: $50,000 · EducationTHE CATHOLIC UNIVER…Coronado Hospital Foundation: $75,000 · HealthRONALD MCDONALD HOUSE CHARITIES OF SOUTHERN ARIZONA INC: $30,900 · HealthThe Neurosurgical Atlas Inc: $25,000 · HealthBEN'S BELLS INC: $10,000 · HealthCYSTIC FIBROSIS FOUNDATION: $10,000 · HealthGOOTTER-JENSEN FOUNDATION: $10,000 · Health+1 more: $5,000 · HealthTUCSON CENTERS FOR WOMEN & CHILDREN INC DBA EMERGE CENTER AGAINST DOMESTIC ABUSE: $50,000 · Human ServicesVIVA PIMA: $35,420 · Human ServicesSt Lukes in the Desert Inc: $30,000 · Human ServicesYOUTH ON THEIR OWN: $25,000 · Human ServicesREID PARK ZOOLOGICAL SOCIETY: $95,000 · AnimalsHumane Society of Southern Arizona: $45,000 · AnimalsTUCSON FESTIVAL OF BOOKS: $100,000 · Arts & CultureACT ONE: $35,000 · Arts & CultureCommunity Food Bank Inc: $105,000 · Food & NutritionMOBILE MEALS OF SOUTHERN ARIZONA INC: $10,000 · Food & Nutrition
Other$3,000,758Education$762,000Health$165,900Human Services$140,420Animals$140,000Arts & Culture$135,000Food & Nutrition$115,000

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 budgetUniversity of Arizona Foundation: $495,000 over 5y, 0.1% of budgetCRISTO REY NETWORK: $137,000 over 3y, 0.7% of budgetCatholic Community Services of Southern Arizona Inc: $120,000 over 1y, 0.5% of budgetCommunity Food Bank Inc: $105,000 over 2y, 0.0% of budgetTUCSON FESTIVAL OF BOOKS: $100,000 over 2y, 8.3% of budgetTUCSON VALUES TEACHERS: $100,000 over 1y, 16% of budgetREID PARK ZOOLOGICAL SOCIETY: $95,000 over 2y, 0.6% of budgetMAGNOLIA GLOBAL ACADEMY FOR LEADERS: $80,000 over 1y, 19% of budgetCoronado Hospital Foundation: $75,000 over 3y, 0.4% of budgetSister Jose Women's Center: $65,000 over 2y, 1.9% of budgetTucson Conquistadores Foundation: $55,000 over 2y, 5.2% of budgetHOLTZ CHARITABLE FOUNDATION INC: $50,000 over 1y, 2.4% of budgetTUCSON CENTERS FOR WOMEN & CHILDREN INC DBA EMERGE CENTER AGAINST DOMESTIC ABUSE: $50,000 over 2y, 0.3% of budgetTHE CATHOLIC UNIVERSITY OF AMERICA: $50,000 over 1y, 0.0% of budgetHumane Society of Southern Arizona: $45,000 over 2y, 0.2% of budgetVIVA PIMA: $35,420 over 1y, 2.5% of budgetACT ONE: $35,000 over 2y, 2.7% of budgetRONALD MCDONALD HOUSE CHARITIES OF SOUTHERN ARIZONA INC: $30,900 over 3y, 0.5% of budgetSt Lukes in the Desert Inc: $30,000 over 2y, 1.1% of budgetROTARY CLUB OF TUCSON FOUNDATION: $30,000 over 1y, 5.5% of budgetTHE DYNAMIC CATHOLIC INSTITUTE: $30,000 over 2y, 0.1% of budgetYOUTH ON THEIR OWN: $25,000 over 1y, 0.5% of budgetThe Neurosurgical Atlas Inc: $25,000 over 1y, 2.3% of budgetSALPOINTE CATHOLIC EDUCATION FOUNDATION: $25,000 over 1y, 5.9% of budgetPATRONATO SAN XAVIER: $25,000 over 1y, 2.5% of budgetIMPACT OF SOUTHERN ARIZONA: $25,000 over 1y, 0.7% of budgetTHE CENTURIONS: $12,000 over 3y, 0.9% of budgetBEN'S BELLS INC: $10,000 over 1y, 1.5% of budgetCYSTIC FIBROSIS FOUNDATION: $10,000 over 1y, 0.0% of budgetFRIENDS OF THE ORINDA LIBRARY INC: $10,000 over 1y, 17% of budgetMOBILE MEALS OF SOUTHERN ARIZONA INC: $10,000 over 1y, 0.9% of budgetGOOTTER-JENSEN FOUNDATION: $10,000 over 1y, 3.2% of budgetCASA DE LOS NINOS: $10,000 over 1y, 0.0% of budgetSHARE OUR STRENGTH: $5,000 over 1y, 0.0% of budgetSILVER & TURQUOISE BOARD OF HOSTESSES: $5,000 over 1y, 14% of budgetHOPE MENTAL HEALTH FOUNDATION: $5,000 over 1y, 1.0% of budgetTHERAPEUTIC RANCH FOR ANIMALS AND KIDS: $5,000 over 1y, 0.7% of budgetJEWISH FEDERATION OF SOUTHERN ARIZONA: $1,500 over 1y, 0.0% of budgetConquistadores Youth Golf Fund: $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.

  • Who funds University of Arizona Foundation ↗
  • Who funds CRISTO REY NETWORK ↗
  • Who funds Catholic Community Services of Southern Arizona Inc ↗
  • Who funds Community Food Bank Inc ↗
  • Who funds TUCSON FESTIVAL OF BOOKS ↗
  • Who funds TUCSON VALUES TEACHERS ↗
  • Who funds REID PARK ZOOLOGICAL SOCIETY ↗
  • Who funds MAGNOLIA GLOBAL ACADEMY FOR LEADERS ↗
  • Who funds Coronado Hospital Foundation ↗
  • Who funds Sister Jose Women's Center ↗
  • Who funds Tucson Conquistadores Foundation ↗
  • Who funds HOLTZ CHARITABLE FOUNDATION INC ↗
  • Who funds TUCSON CENTERS FOR WOMEN & CHILDREN INC DBA EMERGE CENTER AGAINST DOMESTIC ABUSE ↗
  • Who funds THE CATHOLIC UNIVERSITY OF AMERICA ↗
  • Who funds Humane Society of Southern Arizona ↗
  • Who funds VIVA PIMA ↗
  • Who funds ACT ONE ↗
  • Who funds RONALD MCDONALD HOUSE CHARITIES OF SOUTHERN ARIZONA INC ↗
  • Who funds St Lukes in the Desert Inc ↗
  • Who funds ROTARY CLUB OF TUCSON FOUNDATION ↗
  • Who funds THE DYNAMIC CATHOLIC INSTITUTE ↗
  • Who funds YOUTH ON THEIR OWN ↗

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.

Community Foundation …Arizona Community Fou…United Way of Tucson …The Hs Lopez Family F…Jewish Community Foun…Ginny L Clements Char…Frederick Gardner Cot…The Intuit FoundationConnie Hillman Family…Iverson Family Founda…The Roy H Rogers Foun…Marshall Foundation
Community Foundation for Southern ArizonaAZ51.3× affinity23 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Community Foundation for Southern Arizona · Arizona Community Foundation · United Way of Tucson and Southern Arizona Inc · The Hs Lopez Family Foundation · Jewish Community Foundation of Southern Arizona · Ginny L Clements Charitable Trust · Frederick Gardner Cottrell Foundation · The Intuit Foundation · Connie Hillman Family Foundation · Iverson Family Foundation · The Roy H Rogers Foundation Trust · Marshall 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 William and Mary Ross Foundation funds: left to right is the share of its income from government, bottom to top the share from William and Mary Ross Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 20%1%5%11%20%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
    2get no government money at all
    11report 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 William and Mary Ross Foundation?

    Find your warmest path to William and Mary Ross 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 71 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 2024, released 2024. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

    Source object · view filing

    Play a game based on William and Mary Ross’ 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