How much does William and Inez Mabie Family Foundation give?

William and Inez Mabie Family Foundation reported 16 grants totaling $1,645,500 in its FY2021 IRS filing. It funded between 5 and 20 organizations a year over FY2017 to FY2021.

What does William and Inez Mabie Family Foundation fund?

By grant dollars over FY2017 to FY2021, its largest causes are Crime & Legal (32%), Education (31%), Health (25%).

Who are William and Inez Mabie Family Foundation's largest grantees?

By total granted over FY2017 to FY2021: The Uc Davis Foundation ($500k), President-Board of Trustees Santa Clara College ($500k), Redwood Empire Food Bank ($190k).

Does William and Inez Mabie Family Foundation fund new organizations?

In FY2021, 75% of the organizations it funded were first-time grantees.

Does William and Inez Mabie Family Foundation accept unsolicited applications?

Its most recent filing reports that it accepts unsolicited grant applications.

Which funders back the same organizations as William and Inez Mabie Family Foundation?

Its strongest co-funders, measured against what their size predicts, include Marin Community Foundation, National Philanthropic Trust, American Endowment Foundation.

Where is William and Inez Mabie Family Foundation based?

William and Inez Mabie Family Foundation is based in CA.

William and Inez Mabie Family Foundation

William and Inez Mabie Family Foundation at a glance

· Private foundation

William and Inez Mabie Family Foundation

Its FY2021 filing reports that it accepted unsolicited grant applications.

$1.6M

Granted FY2021

Grants FY2021

States reached

$750k

Largest

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 2021.

Crime & Legal$1.8MEducation$1.8MHealth$1.4MEnvironment$253kFood & Nutrition$235kAnimals$139kHousing & Shelter$30kPublic Safety & Disaster$11kOther$0

02FY2021 · 16 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2021

Under $10k4 grants · $15k
$10k–50k7 grants · $81k
$50k–250k3 grants · $300k
$250k+2 grants · $1.3M

$10,000

Median grant

States reached

$3.1M

Total assets

Largest grants
Recipient	Amount
Santa Clara Law School	$750,000
UC Davis Foundation	$500,000
ALS Gold West Chapter	$200,000
Center for Biological Diversity	$50,000
Immigration Institute of the Bay Ar	$50,000
Equal Justice America	$16,000
Community Food Bank of San Benito C	$15,000
Save Napa Valley Foundation	$10,000
Individual grant recipient	$10,000
Connolly Ranch Education Center	$10,000
The Napa Communities Firewise Found	$10,000
Maldanado Foundation	$10,000
Napa Climate Now350 Bay Area	$8,000
Collabria Care	$5,000
Cub Scout Pack 7196	$1,000

02The need

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 (FY21–21, $5k) land where the poverty rate runs at 9%, against an area that typically sits at 7%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

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.

53%of every dollar goes to organizations it has funded before.

$3.0M · 10 repeat orgs$2.7M to everyone else

Grantees it renews have grown median revenue +118% since the first grant, against +31% for those funded once.

10 repeat relationships: 4 still active in FY2021, 6 since wound down; 12 grantees were first funded in FY2021 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

Total granted

$3.0M

$1.8M

Median revenue growth · since first grant

+118%

+31%

Still filing today

40%

42%

New vs renewed · share of each year

In FY2021, 48% of grant dollars renewed an existing relationship; $855k went to new ones.

RenewedFirst-time

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

EducationEnvironmentFood & NutritionAnimalsHealthCrime & LegalOther

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

RE
REDWOOD EMPIRE FOOD BANK
4× · 2017–2020 · $190k · revenue +118%
MC
Mendocino Coast Botanical Gardens
3× · 2017–2019 · $140k · revenue +162%
EJ
EQUAL JUSTICE AMERICA INC
4× · 2017–2021 · $85k · revenue +65%

Funded once

UO
University of Santa Clara Law Schoo
one grant, 2020 · $750k
PO
PRESIDENT-BOARD OF TRUSTEES SANTA CLARA COLLEGEgraduated
one grant, 2018 · $500k · revenue +39%
UD
UC Davis Center of Equine Health
one grant, 2017 · $250k

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.

Sonoma Mountain Institute

Environment

Monterey Bay Aquarium Research Institute

—

Sustainable Conservation

Sustainable Conservation advances the collaborative stewardship of Californias land, air, and water for the benefit of nature and people. For over three decades, Sustainable Conservation has built coalitions of people with different…

Environment

Rancho Santa Ana Botanic Garden

Rancho santa ana botanic gardens promotes botany, conservation, and horticulture to inspire, inform and educate the public and scientific community about california's native flora. the garden is devoted to the collection, cultivation,…

Environment

California College of the Arts

California college of the arts educates students to shape culture and society through the practice and critical study of art, architecture, design, and writing. benefitting from its san francisco bay area location, the college prepares…

Education

California Institute for Biodiversity

Create and publish educational materials, conduct professional development, promote awareness, and sponsor research on the spectacular biological diversity of the State of CA.

Education

San Francisco Bay Bird Observatory

The San Francisco Bay Bird Observatory is dedicated to the conservation of birds and their habitats through science and outreach.

Environment

Sempervirens Fund

To ensure coast redwood forests in the santa cruz mountains thrive for generations to come. since 1900, sempervirens has protected more than 36,000 acres. learn more about our mission, vision, and strategic plan through 2030 at:…

Environment

Uc Santa Barbara Foundation

The uc santa barbara foundation actively works to further the goals of the university of california, santa barbara. the foundation seeks to maintain and nurture the university's quality and distinction. on behalf of the campus, the…

Education

The California Endowment

Philanthropy

Sonoma Ecology Center

The Mission of Sonoma Ecology Center is to work with our community to enhance and sustain ecological health in the Sonoma valley.

Environment

Califonia State University East Bay Foundation Inc

Csu east bay foundation is an auxiliary organization of california state university east bay and the california state university system. the organization's mission is to provide services that aid, supplement, and advance the educational…

Education

How this is measured

The grantee most central to the portfolio’s shape is Mendocino Coast Botanical Gardens; the most unlike its peers is Sonoma Botanical Garden. 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

19 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. 19 of the 46 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.

Load-bearing (≥25% of a budget)

Early backer (in before they grew)

19/19

Grantees still filing

13/19

Grew since first funded

Where the money sits, by cause and then by grantee

Other$4,071,045Education$1,060,000Food & Nutrition$200,000Environment$155,000Animals$100,000Crime & Legal$85,000Health$15,000

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

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.

Marin Community FoundationCA14.7× affinity5 shared granteesties to 10 of 10Hover any node to trace its alignments.Compare side by side →

Open a dossier: Marin Community Foundation · National Philanthropic Trust · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc · The Blackbaud Giving Fund · The Bank of America Charitable Foundation Inc · Vanguard Charitable Endowment Program · American Online Giving Foundation Inc · 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 William and Inez Mabie Family Foundation funds: left to right is the share of its income from government, bottom to top the share from William and Inez Mabie Family Foundation. Bigger dots raise more.

2024

’20’21’22’23’24’25

no gov moneyreceives it· size = income

0get no government money at all

8report 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 William and Inez Mabie Family Foundation?

Find your warmest path to William and Inez Mabie 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.

Play a game based on William and Inez Mabie 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