· Private foundation
The Thomas and Stacey Siebel Foundation
Its FY2024 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 clustered by its grantee’s IRS cause code (NTEE), by year — across FY2020–2024.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2024
- Under $10k1 grant · $1k
- $10k–50k9 grants · $145k
- $50k–250k3 grants · $432k
- $250k+9 grants · $55M
| Recipient | Amount |
|---|---|
| UNIVERSITY OF ILLINOIS FDN | $50,000,000 |
| SALVATION ARMY - HELENA MT | $1,000,000 |
| SALVATION ARMY - SAN JOSE | $1,000,000 |
| SALVATION ARMY - SAN FRANCISCO | $1,000,000 |
| SALVATION ARMY NEW YORK CITY | $1,000,000 |
| SALVATION ARMY - GREAT FALLS MT | $500,000 |
| BOB HOOVER ACADEMY | $320,000 |
| SIEBEL SCHOLARS FOUNDATION | $315,000 |
| SALVATION ARMY - BILLINGS MT | $250,000 |
| HOOVER INSTITUTION | $200,000 |
| AOPA FOUNDATION | $132,000 |
| AMERICAN ACADEMY OF ARTS & SCIENCES | $100,000 |
| WOLF CREEK VOLUNTEER FIRE DEPT | $25,000 |
| AUGUSTA VOLUNTEER FIRE DEPARTMENT | $25,000 |
| WOLF CREEK SCHOOL | $25,000 |
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 (FY22–24, $110k) land where the poverty rate runs at 10%, 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.
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.
Where the work is directed
The same grants, placed two ways — where each recipient sits, and where its stated purpose earmarks the money.
About 12% of The Thomas and Stacey Siebel Foundation’s grant dollars are earmarked, by their stated purpose, for a different county than the recipient’s own address — money that lands at a nonprofit in one place but is meant to do its work in another.
Recipient view: each grant at its grantee’s ZIP, mapped to a county. Directed view: each grant at the county its stated purpose names, falling back to the recipient’s county when the purpose names no place; US grants only. A county shows only if it carries the top 95% of that view’s dollars. Purposes are read from the foundation’s own 990 grant descriptions.
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.
26 repeat relationships — 18 still active in FY2024, 8 since wound down; 3 grantees were first funded in FY2024 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Still filing today
New vs renewed · share of each year
In FY2024, 10% of grant dollars renewed an existing relationship; $50M 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
- ECEASTSIDE COLLEGE PREPARATORY SCHOOL INC4× · 2020–2023 · $1.0M · revenue +124%
- AEAMERICAN ENTERPRISE INSTITUTE FOR PUBLIC POLICY RESEARCH4× · 2020–2023 · $1.0M · revenue +57%
- BHBOB HOOVER ACADEMY3× · 2022–2024 · $676k · revenue +29% · 28% of their budget
Funded once
- USUS SAILING FOUNDATIONone grant, 2022 · $302k
- WFWOODSIDE FIRE PROTECTION DISTRICTone grant, 2020 · $67k
- ASAUGUSTA SCHOOL DISTRICTone grant, 2023 · $50k
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.
Enhance the ability of actec members to provide the most efficient and highest quality services to their clients; develop qualified trust and estate counselors; improve and reform probate, trust and tax laws, procedures, and standards of…
See schedule ouniversity corporation for atmospheric research (ucar), on behalf of, and in cooperation with its member university members, is engaged in the management of long-term atmospheric and related research and educational…
To advance the arts, sciences, and technology of aeronautics and astronautics and to nurture and promote the professionalism of those engaged in these pursuits. the institute encourages original research, fosters dissemination of new…
Aascu is a washington, d.c. based higher education association that represents the sector of over 500 regional public colleges, universities, and systems whose members share a learning and teaching centered culture, a commitment to…
American foreign service association (afsa) is both the principal advocate for the long-term institutional wellbeing of the professional career foreign service and responsible for safeguarding the interest of afsa members. (continued on…
To ensure the professional growth, personal excellence, and recognition of physician associates, and to support efforts to enable them to improve the quality, accessibility, and cost-effectiveness of patient-centered health care.
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.
Founded in 1900, aau is composed of 71 distinguished institutions in the united states and canada that continually advance society through education, research, and discovery. our u.s. member universities earn the majority of competitively…
Institute for student achievement foundation (isaf) raises funds to support the institute for student achievement (isa), which is a part of educational testing service, a section 501(c)(3) public charity, that wants all students,…
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
Vision: drive positive change through the power of design and focused activism.mission: aia inspires and empowers architects to improve society and transform the world.
Acec research institute serve as the leading source of knowledge and thought leadership for creating a more sustainable, safe, secure, and technically advanced built environment. identify, fund, and provide industry wide research forecasts…
For reference, the grantee most central to the portfolio’s shape is The Aopa Foundation Inc and the most unlike its peers is Montana Meth Project. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
17 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. 17 of the 34 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 University of Illinois Foundation ↗
- Who funds THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY ↗
- Who funds Massachusetts Institute of Technology ↗
- Who funds THE SIEBEL SCHOLARS FOUNDATION ↗
- Who funds EASTSIDE COLLEGE PREPARATORY SCHOOL INC ↗
- Who funds AMERICAN ENTERPRISE INSTITUTE FOR PUBLIC POLICY RESEARCH ↗
- Who funds BOB HOOVER ACADEMY ↗
- Who funds AMERICAN ACADEMY OF ARTS & SCIENCES ↗
- Who funds MONTANA METH PROJECT ↗
- Who funds THE AOPA FOUNDATION INC ↗
- Who funds THE AMERICAN AGORA FOUNDATION INC ↗
- Who funds NEW YORK YACHT CLUB FOUNDATION ↗
- Who funds AUGUSTA VOLUNTEER FIRE DEPARTMENT ↗
- Who funds RECREATIONAL AVIATION FOUNDATION ↗
- Who funds THE HORSE PARK AT WOODSIDE ↗
- Who funds TAHOE FUND ↗
- Who funds CHILDREN'S HEALTH COUNCIL INC ↗
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: Vanguard Charitable Endowment Program · Fidelity Investments Charitable Gift Fund · Donor Advised Charitable Giving Inc · 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 The Thomas and Stacey Siebel 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.
- Massachusetts Institute of Technology — 35% of income from government
- American Academy of Arts & Sciences — 3% of income from government
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 The Thomas and Stacey Siebel Foundation?
Find your warmest path to The Thomas and Stacey Siebel 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.