· Private foundation
William and Inez Mabie Family Foundation
Its FY2021 filing reports that it accepted unsolicited grant applications.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2017–2021.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2021
- Under $10k4 grants · $15k
- $10k–50k7 grants · $81k
- $50k–250k3 grants · $300k
- $250k+2 grants · $1.3M
| 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 |
| Maldanado Foundation | $10,000 |
| The Napa Communities Firewise Found | $10,000 |
| Connolly Ranch Education Center | $10,000 |
| Napa Climate Now350 Bay Area | $8,000 |
| Collabria Care | $5,000 |
| Cub Scout Pack 7196 | $1,000 |
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.
Your 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 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 +118% since the first grant, against +31% for the ones you 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
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2021, 48% of grant dollars renewed an existing relationship; $855k 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
- REREDWOOD EMPIRE FOOD BANK4× · 2017–2020 · $190k · revenue +118%
- MCMendocino Coast Botanical Gardens3× · 2017–2019 · $140k · revenue +162%
- EJEQUAL JUSTICE AMERICA INC4× · 2017–2021 · $85k · revenue +65%
Funded once
- UOUniversity of Santa Clara Law Schooone grant, 2020 · $750k
- POPRESIDENT-BOARD OF TRUSTEES SANTA CLARA COLLEGEgraduatedone grant, 2018 · $500k · revenue +39%
- UDUC Davis Center of Equine Healthone grant, 2017 · $250k
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.
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…
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,…
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…
Create and publish educational materials, conduct professional development, promote awareness, and sponsor research on the spectacular biological diversity of the State of CA.
The San Francisco Bay Bird Observatory is dedicated to the conservation of birds and their habitats through science and outreach.
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:…
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…
The Mission of Sonoma Ecology Center is to work with our community to enhance and sustain ecological health in the Sonoma valley.
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…
For reference, the grantee most central to the portfolio’s shape is Mendocino Coast Botanical Gardens and 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.
19 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. 19 of the 46 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 THE UC DAVIS FOUNDATION ↗
- Who funds PRESIDENT-BOARD OF TRUSTEES SANTA CLARA COLLEGE ↗
- Who funds REDWOOD EMPIRE FOOD BANK ↗
- Who funds Mendocino Coast Botanical Gardens ↗
- Who funds EQUAL JUSTICE AMERICA INC ↗
- Who funds CENTER FOR BIOLOGICAL DIVERSITY INC ↗
- Who funds SONOMA COUNTY HORSE COUNCIL ↗
- Who funds COMMUNITY FOOD BANK OF SAN BENITO COUNTY ↗
- Who funds COMMITTEE ON THE SHELTERLESS ↗
- Who funds MUSCULAR DYSTROPHY ASSOCIATION INC ↗
- Who funds CONNOLLY RANCH EDUCATION CENTER ↗
- Who funds SAVE NAPA VALLEY FOUNDATION ↗
- Who funds DAMIAN MALDONADO MEMORIAL FOUNDATION INC ↗
- Who funds SQUARE PEG FOUNDATION ↗
- Who funds Sonoma Botanical Garden ↗
- Who funds EQUAL JUSTICE INITIATIVE ↗
- Who funds LYCEE FRANCAIS DE SAN FRANCISCO ↗
- Who funds COLLABRIA CARE ↗
- Who funds AMERICAN CONIFER SOCIETY ↗
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: 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
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 William and Inez Mabie 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 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.