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· 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.

$88k
Granted FY2025still arriving
13
Grants FY2025still arriving
5
States reached
$25k
Largest
01What you fund
01100% classified

What you funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year — across FY20172025.

Education$139kArts & Culture$73kHealth$67kEnvironment$44kPhilanthropy$31kCivil Rights$25kPublic Benefit$24kAnimals$24kOther$0
02FY2025 · 13 grants

Where the money goes

Your grants by size, and where they go.

By grant size · FY2025

  • Under $10k9 grants · $23k
  • $10k–50k4 grants · $65k
$3,000
Median grant
5
States reached
$568k
Total assets
Largest grants
RecipientAmount
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
02The need
03

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.

show:

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.

area typical 11%TREASURE STATE FOUNDATION: $3k → 9%PLAY LIKE ROBERT FOUNDATION: $5k → 11%MARINHEALTH FOUNDATION: $7k → 8%CALIFORNIA ACADEMY OF SCIENCES: $5k → 10%THE REPRESENTATION PROJECT: $23k → 12%BRENTWOOD SCHOOL: $5k → 14%UC DAVIS FOUNDATION - MANETTI SHREM MUSEUM OF ART: $24k → 16%THE CHAPIN SCHOOL ADVANCEMENT OFFICE: $5k → 17%FELLOWSHIP OF CHRISTIAN ATHLETES: $10k → 15%ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC PLACES INC: $20k → 6%ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC PLACES INC: $10k → 10%GREENWICH COUNTRY DAY SCHOOL: $5k → 9%DUKE ANNUAL FUND: $10k → 11%CONSERVATION INT'L FDN DEVELOPMENT DEPT: $10k → 7%TREASURE STATE FOUNDATION: $3k → 9%BITTER ROOT HUMANE ASSOCIATION: $2k → 11%MARIN HEALTH FOUNDATION: $5k → 8%CALIFORNIA ACADEMY OF SCIENCES: $3k → 10%THE REPRESENTATION PROJECT: $2k → 12%BRENTWOOD SCHOOL: $2k → 14%THE CHAPIN SCHOOL: $5k → 17%GREENWICH COUNTRY DAY SCHOOL: $5k → 9%DUKE UNIVERSITY ALUMNI & DEVELOPMENT RECORDS: $7k → 11%CONSERVATION INT'L FDN: $3k → 7%TREASURE STATE FOUNDATION: $3k → 9%CALIFORNIA ACADEMY OF SCIENCES: $3k → 10%DISCOVERY LAND COMPANY FOUNDATION: $10k → 14%DUKE UNIVERSITY ATHLETICS IRON DUKES: $5k → 11%ROSS SCHOOL FOUNDATION: $25k → 8%SAN FRANCISCO MUSEUM OF MODERN ART: $6k → 10%DISCOVERY LAND COMPANY FOUNDATION: $10k → 14%BRANSON SCHOOL: $20k → 8%SAN FRANCISCO MUSEUM OF MODERN ART: $2k → 10%THE BRANSON SCHOOL: $10k → 8%ST ANSELM CHURCH: $10k → 8%TELLER WILDLIFE REFUGE: $3k → 11%FRANCIS E MCGOVERN FOUNDATION: $10k → 8%PLUMPJACK FOUNDATION: $3k → 10%THE BRANSON SCHOOL: $5k → 8%RAPTORS OF THE ROCKIES: $2k → 11%THE BRANSON SCHOOL: $5k → 8%RAPTORS OF THE ROCKIES: $2k → 11%THE BRANSON SCHOOL: $5k → 8%RAPTORS OF THE ROCKIES: $2k → 11%ROSS SCHOOL FOUNDATION: $3k → 8%DARBY RODEO ASSOCIATION: $3k → 11%MARIN GENERAL HOSPITAL FOUNDATION: $10k → 8%BAY AREA DISCOVERY MUSEUM: $9k → 8%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount

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

MT
WI
NY
CT
CA
MO
VA
NC
DC
HI
FL

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.

03Your edge
repeat funding

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.

73%of every dollar goes to organizations you’ve funded before.
$338k · 23 repeat orgs$123k to everyone else

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

Re-uppedFunded once

Organizations

23
18

Total granted

$338k
$101k

Median revenue growth · since first grant

+27%
+18%

Still filing today

100%
56%

New vs renewed · share of each year

In FY2025, 73% of grant dollars renewed an existing relationship; $23k went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

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

’17’18’19’20’21’22’23’24’25
EducationEnvironmentHealthAnimalsArts & CulturePublic BenefitOther

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

  • TB
    THE BRANSON SCHOOL
    4× · 2020–2025 · $45k · revenue +65%
  • RS
    Ross School Foundation
    5× · 2018–2025 · $34k · revenue +24%
  • AP
    ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC
    3× · 2019–2025 · $31k · revenue ×26

Funded once

  • UD
    UC DAVIS FOUNDATION - MANETTI SHREM MUSEUM OF ART
    one grant, 2021 · $24k
  • DA
    DUKE ANNUAL FUND
    one grant, 2019 · $10k
  • UO
    UNIVERSITY OF MONTANA WILDLIFE BIOLOGY PROG
    one grant, 2019 · $10k

Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.

04Your field

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.

1
Massachusetts Institute of Technology

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.

Education
2
The Uc Davis Foundation

The mission of the uc davis foundation is to secure, steward and manage private gifts for uc davis.

Education
3
Boston Architectural College

The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.

4
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
5
Trustees of Dartmouth College

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.

Education
6
Ucla Foundation

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…

Education
7
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.

8
University of Redlands

We welcome, educate, and empower a diverse community of learners for lives of meaning, impact, and joy.

Education
9
Pacific University

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.

Education
10
The Trustees of Princeton University

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…

Education
11
Marine Biological Laboratory

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…

Science & Tech
12
Uc Riverside Foundation

To support educational, research and public functions and programs of the riverside campus of the university of california.

Education

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.

← shrinkinggrowing →↓ leaning in → pulling backsteadyIndependent K-8 SchoolsPublic School District Foun…Land Conservation Organizat…Christian Missionary Organi…Public Library SupportWildlife Rehabilitation Cen…Government Accountability R…Community FoundationsFallen First Responder Supp…Community Health CentersSmall Business Development …Animal Rescue and AdoptionFaith-Based Liberal Arts Co…Cancer Support OrganizationsPublic University Foundatio…Community Arts Organizations
the sector your giving your giving is ahead of the sector the sector’s ahead of you· dot size = how much the theme matters to each side
Ordered by the change in your giving — leaning in on top, pulling back at the bottom. The bar between the two dots is how out of step you are with the sector. Hover any row for detail.

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 FIELDby orgYOUR GRANTEESby number24%6%<5yr15%3%5–10yr20%21%10–20yr17%15%20–35yr11%30%35–55yr13%24%55yr+
THE FIELDby orgYOUR MONEYby value24%4%<5yr15%3%5–10yr20%19%10–20yr17%7%20–35yr11%31%35–55yr13%36%55yr+

The field is 24% startups (under 5 years old) — 6% of your grantees by number, and just 4% of your money.

Closures · last 5 years

The orgs you fund almost never close 3% lost their exemption, against 14% of the field you don’t fund.

orgs you fund
3%1/39
the rest of the field
14%
26,003/186,939

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.

04the grantee network

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 20172025, 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.

0
Load-bearing (≥25% of a budget)
8
Early backer (in before they grew)
36/36
Grantees still filing
26/36
Grew since you first funded

Where your money sits — by cause, then by grantee

THE BRANSON SCHOOL — $45,000 · EducationTHE BRANSON SCHOOLRoss School Foundation — $34,000 · EducationRoss School FoundationUNIVERSITY OF CALIFORNIA SAN FRANCISCO FOUNDATION — $30,000 · EducationUNIVERSITY OF CALIFORNIA SAN FRANCISCO F…THE UNIVERSITY OF MONTANA FOUNDATION — $16,000 · EducationTHE UNIVERSITY OF MONTANA FOUNDATIONGREENWICH COUNTRY DAY SCHOOL INC — $10,000 · EducationGREENWICH COUNTRY DAY SCHOOL INCTHE CHAPIN SCHOOL LTD — $10,000 · EducationTHE CHAPIN SCHOOL LTDDUKE UNIVERSITY — $7,905 · EducationBRENTWOOD SCHOOL — $7,000 · Education+1 more — $5,000 · EducationUC DAVIS FOUNDATION - MANETTI SHREM MUSEUM OF ART — $23,500 · OtherUC DAVIS FOUNDATION - MANETTI …DUKE ANNUAL FUND — $10,000 · OtherDUKE ANNUAL FUNDUNIVERSITY OF MONTANA WILDLIFE BIOLOGY PROG — $10,000 · OtherUNIVERSITY OF MONTANA WILDLIFE…ST ANSELM CHURCH — $10,000 · OtherST ANSELM CHURCHFRANCIS E MCGOVERN FOUNDATION — $10,000 · OtherFRANCIS E MCGOVERN FOUNDATIONOceanic Society Expeditions — $8,000 · OtherOceanic Society ExpeditionsDUKE UNIVERSITY ATHLETICS IRON DUKES — $5,000 · OtherRAPTORS OF THE ROCKIES — $11,050 · OtherRAPTORS OF THE ROCKIESTREASURE STATE FOUNDATION — $9,000 · OtherTREASURE STATE FOUNDATIONPLAY LIKE ROBERT FOUNDATION — $5,000 · OtherFELLOWSHIP OF CHRISTIAN ATHLETES — $10,000 · OtherFELLOWSHIP OF CHRISTIAN ATHLET…+9 more — $12,030 · Other+9 moreALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC — $31,000 · EnvironmentALPHA PI ALLIAN…CONSERVATION INTERNATIONAL FOUNDATION — $12,500 · EnvironmentCONSERVATION IN…CLARK FORK COALITION — $11,000 · EnvironmentCLARK FORK COAL…THE MONTANA LAND RELIANCE — $6,000 · EnvironmentTHE MONTANA LAN…BITTER ROOT LAND TRUST — $3,000 · EnvironmentMARIN GENERAL HOSPITAL FOUNDATION — $22,050 · HealthGRACE SCIENCE FOUNDATION — $7,000 · HealthTHE MAVEN PROJECT — $5,000 · HealthTHE PLUMPJACK FOUNDATION — $2,500 · HealthCALIFORNIA ACADEMY OF SCIENCES — $10,000 · Arts & CultureSAN FRANCISCO MUSEUM OF MODERN ART — $9,150 · Arts & CultureBAY AREA DISCOVERY MUSEUM — $9,000 · Arts & CultureThe Representation Project — $25,000 · Civil RightsTHE DISCOVERY LAND COMPANY FOUNDATION — $20,000 · PhilanthropyTHE JIM SAUNDERS FUND — $4,000 · PhilanthropyMARIN COMMUNITY FOUNDATION — $1,000 · Philanthropy
Education$164,905Other$123,580Environment$63,500Health$36,550Arts & Culture$28,150Civil Rights$25,000Philanthropy$25,000

Each org by its size and your share of it — top-left is where you’re load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ your share of their budgetTHE BRANSON SCHOOL — $45,000 over 4y, 0.1% of budgetRoss School Foundation — $34,000 over 5y, 1.4% of budgetALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC — $31,000 over 3y, 4.1% of budgetUNIVERSITY OF CALIFORNIA SAN FRANCISCO FOUNDATION — $30,000 over 2y, 0.0% of budgetThe Representation Project — $25,000 over 2y, 1.8% of budgetMARIN GENERAL HOSPITAL FOUNDATION — $22,050 over 3y, 0.1% of budgetTHE DISCOVERY LAND COMPANY FOUNDATION — $20,000 over 2y, 1.0% of budgetTHE UNIVERSITY OF MONTANA FOUNDATION — $16,000 over 4y, 0.0% of budgetCONSERVATION INTERNATIONAL FOUNDATION — $12,500 over 1y, 0.0% of budgetRAPTORS OF THE ROCKIES — $11,050 over 6y, 2.7% of budgetCLARK FORK COALITION — $11,000 over 2y, 0.5% of budgetCALIFORNIA ACADEMY OF SCIENCES — $10,000 over 3y, 0.0% of budgetGREENWICH COUNTRY DAY SCHOOL INC — $10,000 over 2y, 0.0% of budgetTHE CHAPIN SCHOOL LTD — $10,000 over 2y, 0.0% of budgetFELLOWSHIP OF CHRISTIAN ATHLETES — $10,000 over 1y, 0.0% of budgetSAN FRANCISCO MUSEUM OF MODERN ART — $9,150 over 3y, 0.0% of budgetBAY AREA DISCOVERY MUSEUM — $9,000 over 1y, 0.1% of budgetTREASURE STATE FOUNDATION — $9,000 over 3y, 0.4% of budgetOceanic Society Expeditions — $8,000 over 6y, 0.1% of budgetDUKE UNIVERSITY — $7,905 over 2y, 0.0% of budgetBRENTWOOD SCHOOL — $7,000 over 1y, 0.0% of budgetGRACE SCIENCE FOUNDATION — $7,000 over 7y, 0.1% of budgetTHE MONTANA LAND RELIANCE — $6,000 over 3y, 0.0% of budgetPLAY LIKE ROBERT FOUNDATION — $5,000 over 1y, 3.7% of budgetTHE MAVEN PROJECT — $5,000 over 5y, 0.1% of budgetTHE JIM SAUNDERS FUND — $4,000 over 2y, 0.5% of budgetTELLER WILDLIFE REFUGE INC — $3,500 over 2y, 0.4% of budgetBITTER ROOT LAND TRUST — $3,000 over 3y, 0.1% of budgetTHE PLUMPJACK FOUNDATION — $2,500 over 1y, 0.7% of budgetDARBY RODEO ASSOCIATION — $2,500 over 1y, 0.4% of budgetBITTER ROOT HUMANE ASSOCIATION — $2,000 over 1y, 0.2% of budgetRAVALLI COUNTY ECONOMIC DEVELOPMENT AUTHORITY — $2,000 over 1y, 0.6% of budgetCALIFORNIA FIRE FOUNDATION — $1,000 over 1y, 0.0% of budgetMARIN COMMUNITY FOUNDATION — $1,000 over 1y, 0.0% of budgetTHE HERITAGE FOUNDATION — $200 over 1y, 0.0% of budget
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.

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.

Marin Community FoundationCA21.7× affinity9 shared granteesties to 8 of 11Hover any node to trace its alignments.Compare side by side →

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.

2024
202122232425
no gov · 10%0%1%3%5%your share of their income ↑0%25%50%75%100%share of the org’s income from government
    no gov moneyreceives it· size = income
    1get no government money at all
    6report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    typical government reliance, FY2025

    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.

    05Through Plinth

    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.

    On method. Every financial figure here is read directly from IRS e-file XML — your own 990/990-PF and the multi-year returns of the 45 grantees we resolved across every year we hold, several hundred filings in all (a different count from the grant rows on the cover, which are one fiscal year)— each linked to its source. Grantee achievements and outcomes are each organization’s own program-service reporting (Form 990, Part III); we read these as association with sustained funding — the foundation is one of several forces — suppress low-confidence name matches rather than guess, and say so where a figure rests on a single grant or filing. Not everything on this page is a filed figure, and the difference matters. Filed is what you reported on your 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. How we build these →

    Generated from your IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12–24 months behind; figures are dated accordingly.

    Source object · view filing

    More from the funding graph