Thomas Siebel
American businessman
Source: Wikidata — retrieved 8/30/2026 (wikidata)
Profile Summary
Thomas Siebel is an American businessman in the technology industry, based in California and born in 1952. He has an estimated net worth of ~$4.1 billion. SEC records identify C3.ai, Inc., a software company traded under ticker AI, and a Siebel Living Trust associated with him. Wikidata SEC EDGAR
Business & SEC Activity
C3.ai, Inc. is classified by the SEC as a provider of prepackaged software. SEC records list 570 company filings, including 435 insider filings; recent filings include Forms 4 and Forms 144. Form 4 reports changes in an insider's beneficial ownership, while Form 144 generally reports a planned sale of restricted or control securities. SEC EDGAR
Philanthropy
In tax year 2023, the Siebel Family Charitable Foundation reported $44,800 in grants, $498,626 in assets, and $50,425 in expenses. The Thomas And Stacey Siebel Foundation reported $6,500,816 in grants, $116,780,977 in assets, and $7,394,501 in expenses; together, the two foundations reported $6,545,616 in grants and $117,279,603 in assets. ProPublica 990
Political Activity
The FEC sample contains at least 100 federal contributions and covers only the most recent 100 records, so its $1,569,668.38 total is not a complete lifetime figure. Within that sample, $871,668.38 went to Republican committees or candidates, $5,000 went to Democratic recipients, and $693,000 went to PACs or other recipients. The largest listed recipients were Grow the Majority at $547,000, the NRCC at $310,099.90, and the Republican National Committee at $253,500. FEC
In the News
A GDELT-listed article dated August 14, 2026, reported that C3.ai CEO Thomas Siebel sold 453,000 shares for $4.8 million. The article was published by The Motley Fool. GDELT
U.S. Presence
Philanthropy
Foundations are matched to a person by name, not by trustee records — so a same-surname family foundation can land here in error. Every entity below links to its full IRS filing; if one doesn’t belong, tell us at hello@skylarkcreations.com and we’ll pull it.
Political Contributions
These figures cover the 100 most recent federal contributions on file, not the full record. The total, party split, top recipients and dates below are all computed over that sample, so each is a floor rather than a complete figure.
By Party (in the sample)
Top Recipients (in the sample)
Matched by name only. These are the donations the FEC lists under this person’s name — so a different person with the same name can show up here too.
SEC Filings
Associated Companies
Entities appearing alongside this person in SEC full-text search — an association, not necessarily ownership or control. Follow each link to the primary SEC record to judge for yourself.
Recent Insider Filings
Score Breakdown
The PBS is a weighted average of 2 components. The formula is open and versioned — the weight percentages below show how much each component contributes to the final score.
Evidenced charitable giving — built on what they actually give each year, not parked assets. Dominated by generosity (annual giving relative to net worth — the share of your fortune you give), plus the absolute scale of that giving, plus a small nudge for signing the Giving Pledge (a commitment, not a realized action).
Data: ProPublica 990 charitable disbursements, net worth, The Giving Pledge registry
How much sourced, public accountability data exists — net worth, political contributions, SEC filings, foundation 990s, news coverage, and a verified profile. More public disclosure scores higher.
Data: FEC, SEC EDGAR, ProPublica 990s, GDELT / NewsAPI, Wikidata
Formula (v2): PBS = 65% x Philanthropy + 35% x Transparency
Scored on 8/31/2026 on a 0–100 scale. The score uses only the signals we have populated data for. Goal Impact, Controversy, and Community Approval are deferred until that data exists — Phase 1 goal adoption, controversy detection, and community votes respectively.
All data is sourced from public records. Each section links to its original source. View on Wikidata