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Siebel Family Charitable Foundation at a glance

· 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 it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
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 2025.

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

Where the money goes

Grants by size, and the largest recipients.

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
CLARK FORK COALITION$1,000
ALPHA PI ALLIANCE FOR THE PRESERVATION OF HISTORIC PLACES INC$1,000
TELLER WILDLIFE REFUGE$1,000
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:

Dollar for dollar, its grants (FY17–25) land where the poverty rate runs at 10%, against an area that typically sits at 11%. 40% of its dollars go to grantees based in above-average-need neighborhoods. Its 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%ST ANSELM CHURCH: $10k → 8%THE BRANSON SCHOOL: $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
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

MT
WI
NY
CT
CA
MO
VA
NC
DC
HI
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.

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

Grantees it renews have grown median revenue +27% since the first grant, against +18% for those 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
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

  • 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
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
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
How this is measured
The grantee most central to the portfolio’s shape is The Heritage Foundation; 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.
04the grantee network

36 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. 36 of the 45 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)
8
Early backer (in before they grew)
36/36
Grantees still filing
26/36
Grew since first funded

Where the money sits, by cause and 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 FOUNDATIONTHE CHAPIN SCHOOL LTD: $10,000 · EducationTHE CHAPIN SCHOOL LTDGREENWICH COUNTRY DAY SCHOOL INC: $10,000 · EducationGREENWICH COUNTRY DAY SCHOOL INCDUKE 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 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 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 budgetTHE CHAPIN SCHOOL LTD: $10,000 over 2y, 0.0% of budgetFELLOWSHIP OF CHRISTIAN ATHLETES: $10,000 over 1y, 0.0% of budgetGREENWICH COUNTRY DAY SCHOOL INC: $10,000 over 2y, 0.0% of budgetSAN FRANCISCO MUSEUM OF MODERN ART: $9,150 over 3y, 0.0% of budgetTREASURE STATE FOUNDATION: $9,000 over 3y, 0.4% of budgetBAY AREA DISCOVERY MUSEUM: $9,000 over 1y, 0.1% of budgetOceanic Society Expeditions: $8,000 over 6y, 0.1% of budgetDUKE UNIVERSITY: $7,905 over 2y, 0.0% of budgetGRACE SCIENCE FOUNDATION: $7,000 over 7y, 0.1% of budgetBRENTWOOD SCHOOL: $7,000 over 1y, 0.0% 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 budgetDARBY RODEO ASSOCIATION: $2,500 over 1y, 0.4% of budgetTHE PLUMPJACK FOUNDATION: $2,500 over 1y, 0.7% of budgetRAVALLI COUNTY ECONOMIC DEVELOPMENT AUTHORITY: $2,000 over 1y, 0.6% of budgetBITTER ROOT HUMANE ASSOCIATION: $2,000 over 1y, 0.2% 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
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 Found…Gordon E and Betty I …Jewish Community Fede…The San Francisco Fou…Gs Donor Advised Phil…Withycombe FoundationChristian Development…Rapp Family Foundatio…Silicon Valley Commun…National Philanthropi…American Endowment Fo…Morgan Stanley Global…
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

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 Siebel Family Charitable Foundation funds: left to right is the share of its income from government, bottom to top the share from Siebel Family Charitable Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 10%0%1%3%5%funder's 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, 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 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 from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 45 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 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

    Source object · view filing

    Play a game based on Siebel 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