Thomas Duff vs Mark Zuckerberg
Real-time net worth, career, and company comparison — updated May 2026.
Wealth at a Glance
Net worth gap: $203.2B — equivalent to 98% of Mark's total wealth.
Tale of the Tape
Net Worth History
| Year | Thomas | Mark | Leader |
|---|---|---|---|
| 2022 | — | $65B | — |
| 2023 | — | $170B | — |
| 2024 | $4.5B | $224.1B | Mark |
| 2025 | $4.5B | $222B | Mark |
| 2026 | $4.455B | $207.68B | Mark |
Career Highlights
Thomas Duff
- 1979GraduatedEarned a bachelor's degree in business administration from the University of Southern Mississippi.
- 1983Took over Southern Tire MartTook over the family business, Southern Tire Mart, with his brother James.
- 2003Reacquired Southern Tire MartBought back Southern Tire Mart and rebranded it.
- 2007Cofounded Duff Capital InvestorsCo-founded Duff Capital Investors with his brother James.
Mark Zuckerberg
- 2004Founded FacebookCo-founded Facebook while at Harvard University.
- 2008Became a BillionaireBecame a billionaire at age 23.
- 2012Facebook IPOTook Facebook public, making it one of the largest IPOs in history.
- 2021Meta RebrandingFacebook rebranded to Meta Platforms, Inc., focusing on the metaverse.
The Verdict: Mark Zuckerberg vs Thomas Duff
As of May 2026, Mark Zuckerberg leads this comparison with a net worth of $207.68B, placing at #6 in the global rankings. Thomas Duff follows at $4.455B — a gap of $203.2B.
The two leaders come from distinct industries — Diversified for Thomas Duff and Technology for Mark Zuckerberg. Comparing them is therefore a comparison of different underlying asset types, growth rates, and risk profiles rather than a simple head-to-head within the same market.
Thomas Duff is 69 years old versus 41 for Mark Zuckerberg, a difference of 28 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.
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Net worth estimates updated daily from public financial disclosures. Methodology · Report an error