· Private foundation
Siebel Family Charitable 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 FY2017–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k9 grants · $23k
- $10k–50k4 grants · $65k
| Recipient | Amount |
|---|---|
| ROSS SCHOOL FOUNDATION | $25,000 |
| BRANSON SCHOOL | $20,000 |
| CONSERVATION INT'L FDN DEVELOPMENT DEPT | $10,000 |
| ST ANSELM CHURCH | $10,000 |
| STANFORD UNIVERSITY | $5,000 |
| GREENWICH COUNTRY DAY SCHOOL | $5,000 |
| TREASURE STATE FOUNDATION | $3,000 |
| CONSERVATION INT'L FDN | $2,500 |
| OCEANIC SOCIETY | $2,000 |
| RAPTORS OF THE ROCKIES | $2,000 |
| TELLER WILDLIFE REFUGE | $1,000 |
| CLARK FORK COALITION | $1,000 |
| ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC PLACES INC | $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.
Dollar for dollar, your grants (FY17–25) land where the poverty rate runs at 10%, against an area that typically sits at 11%. 40% of your dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-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.
Which US states your grants reach
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 +27% since the first grant, against +18% for the ones you funded once.
23 repeat relationships — 9 still active in FY2025, 14 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, 73% of grant dollars renewed an existing relationship; $23k 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
- TBTHE BRANSON SCHOOL4× · 2020–2025 · $45k · revenue +65%
- RSRoss School Foundation5× · 2018–2025 · $34k · revenue +24%
- APALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC3× · 2019–2025 · $31k · revenue ×26
Funded once
- UDUC DAVIS FOUNDATION - MANETTI SHREM MUSEUM OF ARTone grant, 2021 · $24k
- DADUKE ANNUAL FUNDone grant, 2019 · $10k
- UOUNIVERSITY OF MONTANA WILDLIFE BIOLOGY PROGone grant, 2019 · $10k
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 mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.
The mission of the uc davis foundation is to secure, steward and manage private gifts for uc davis.
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
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…
Dartmouth College educates the most promising students and prepares them for a lifetime of learning and of responsible leadership, through a faculty dedicated to teaching and the creation of knowledge.
The ucla foundation is the giving, receiving, and investing arm of the ucla campus. the foundation enables private donors to help build, sustain and advance one of the world's finest academic and research institutions. private philanthropy…
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.
We welcome, educate, and empower a diverse community of learners for lives of meaning, impact, and joy.
A diverse and sustainable learning community dedicated to discovery and excellence in teaching, scholarship and practice, pacific university inspires students to think, care, create and pursue justice in our world.
Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…
The Marine Biological Laboratory (MBL) is a world-renowned center for biological discovery and training that is notably affiliated with more than 60 Nobel Prize winners. Research is conducted by full-time faculty as well as hundreds of the…
To support educational, research and public functions and programs of the riverside campus of the university of california.
For reference, the grantee most central to the portfolio’s shape is The Heritage Foundation and the most unlike its peers is Ravalli County Economic Development Authority. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 36 years old; the field is 14. You back the established end — and your money leans older still.
The field is 24% startups (under 5 years old) — 6% of your grantees by number, and just 4% of your money.
The orgs you fund almost never close — 3% lost their exemption, against 14% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
36 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. 36 of the 45 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 BRANSON SCHOOL ↗
- Who funds Ross School Foundation ↗
- Who funds ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC ↗
- Who funds UNIVERSITY OF CALIFORNIA SAN FRANCISCO FOUNDATION ↗
- Who funds The Representation Project ↗
- Who funds MARIN GENERAL HOSPITAL FOUNDATION ↗
- Who funds THE DISCOVERY LAND COMPANY FOUNDATION ↗
- Who funds THE UNIVERSITY OF MONTANA FOUNDATION ↗
- Who funds CONSERVATION INTERNATIONAL FOUNDATION ↗
- Who funds RAPTORS OF THE ROCKIES ↗
- Who funds CLARK FORK COALITION ↗
- Who funds CALIFORNIA ACADEMY OF SCIENCES ↗
- Who funds GREENWICH COUNTRY DAY SCHOOL INC ↗
- Who funds THE CHAPIN SCHOOL LTD ↗
- Who funds FELLOWSHIP OF CHRISTIAN ATHLETES ↗
- Who funds SAN FRANCISCO MUSEUM OF MODERN ART ↗
- Who funds BAY AREA DISCOVERY MUSEUM ↗
- Who funds TREASURE STATE FOUNDATION ↗
- Who funds Oceanic Society Expeditions ↗
- Who funds DUKE UNIVERSITY ↗
- Who funds BRENTWOOD SCHOOL ↗
- Who funds GRACE SCIENCE FOUNDATION ↗
- Who funds THE MONTANA LAND RELIANCE ↗
- Who funds PLAY LIKE ROBERT FOUNDATION ↗
- Who funds THE MAVEN PROJECT ↗
- Who funds THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY ↗
- Who funds THE JIM SAUNDERS FUND ↗
- Who funds TELLER WILDLIFE REFUGE INC ↗
- Who funds BITTER ROOT LAND TRUST ↗
- Who funds THE PLUMPJACK FOUNDATION ↗
- Who funds DARBY RODEO ASSOCIATION ↗
- Who funds BITTER ROOT HUMANE ASSOCIATION ↗
- Who funds RAVALLI COUNTY ECONOMIC DEVELOPMENT AUTHORITY ↗
- Who funds CALIFORNIA FIRE FOUNDATION ↗
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 · Gordon E and Betty I Moore Foundation · Jewish Community Federation of San Francisco the Peninsula Marin & Sonoma · The San Francisco Foundation · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Withycombe Foundation · Christian Development Foundation Inc · Rapp Family Foundation Inc · Silicon Valley Community Foundation · National Philanthropic Trust · 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 Siebel Family Charitable 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 Siebel Family Charitable Foundation?
Find your warmest path to Siebel Family Charitable 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.