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Net Worth Comparison

Thomas Siebel vs Elon Musk

Real-time net worth, career, and company comparison — updated May 2026.

Thomas Siebel

Thomas Siebel

CEO, Business software
Net Worth
$3.956B
+0.21% today
Elon Musk
Wealthier

Elon Musk

CEO, Tesla, Inc.
Net Worth
$807.656B
+$803.7B more than Thomas
+1.18% today

Wealth at a Glance

Thomas Siebel$3.956B
Elon Musk$807.656B

Net worth gap: $803.7B — equivalent to 100% of Elon's total wealth.

Tale of the Tape

Thomas Siebel
Elon Musk
$3.956B
Net Worth
$807.656B
#1078
Global Rank
#1
73
Age
54
UNITED STATES
Country
UNITED STATES
Business software
Source of Wealth
Tesla, SpaceX
Technology
Industry
Technology
University of Illinois Urbana-Champaign (BA, MBA, MS)
Education
University of Pennsylvania (BA, BS)

Net Worth History

YearThomasElonLeader
2022—$146B—
2023—$235.5B—
2024$3.9B$839.6BElon
2025$3.9B$839BElon
2026$3.956B$807.656BElon

Career Highlights

Thomas Siebel

  1. 1984
    Joined Oracle
    Held various management positions at Oracle Corporation.
  2. 1993
    Founded Siebel Systems
    Founded Siebel Systems, a CRM software company.
  3. 2006
    Siebel Systems Acquired
    Siebel Systems was acquired by Oracle for $5.8 billion.
  4. 2009
    Founded C3.ai
    Founded C3.ai, an enterprise AI software company.
  5. 2025
    Transitioned to Executive Chairman
    Transitioned to Executive Chairman of C3.ai.

Elon Musk

  1. 1995
    Co-founded Zip2
    Co-founded Zip2, an online city guide for newspapers.
  2. 1999
    Co-founded X.com
    Co-founded X.com, which later became PayPal.
  3. 2002
    Founded SpaceX
    Founded Space Exploration Technologies Corp. (SpaceX).
  4. 2004
    Became Chairman of Tesla
    Led the first funding round for Tesla and became its Chairman.
  5. 2008
    Became CEO of Tesla
    Became CEO of Tesla Motors.

The Verdict: Elon Musk vs Thomas Siebel

As of May 2026, Elon Musk leads this comparison with a net worth of $807.656B, placing at #1 in the global rankings. Thomas Siebel follows at $3.956B — a gap of $803.7B.

Both executives operate in the Technology sector, making this a direct peer comparison. Their wealth trajectories reflect the broader performance of that industry over time, though individual company strategy, equity ownership structure, and capital allocation decisions have driven meaningfully different outcomes.

Thomas Siebel is 73 years old versus 54 for Elon Musk, a difference of 19 years. Age context matters in wealth comparisons: a younger billionaire at the same net worth has had less time to accumulate — and in many cases represents a higher compound annual growth rate on their wealth.

Net worth figures are estimates calculated from public shareholding disclosures, stock price data, and reported asset values. See our full methodology.

Explore Full Profiles

Thomas Siebel
Thomas Siebel
Full profile → net worth, bio, career history
Elon Musk
Elon Musk
Full profile → net worth, bio, career history

Net worth estimates updated daily from public financial disclosures. Methodology · Report an error