Thomas Siebel

Active Investor

Executive Chairman at C3 AI

Redwood City, California

Thomas Siebel, Executive Chairman at C3 AI is an active investor based in Redwood City, California. This profile covers what Thomas Siebel backs, at which stage, and how founders can reach out in 2026.

Investor type: Angel
Stages: Seed
Invests in: Artificial IntelligenceHealthcare & BiotechSaaS & EnterpriseConsumer & RetailClimate & EnergyDeveloper Tools & DataIoT & Connected DevicesManufacturing & Industrial
Location: Redwood City, California
Typical check: $250K
Past investments: 1

Notable investments

C3 AI

How to reach Thomas Siebel

Angels and operators like Thomas Siebel reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.

Frequently Asked Questions

What does Thomas Siebel invest in?

Thomas Siebel invests in Artificial Intelligence, Healthcare & Biotech, SaaS & Enterprise and Consumer & Retail, typically at Seed. Match your sector and stage, then reach out with a personalized pitch.