Dennis Washington vs Mark Zuckerberg
Real-time net worth, career, and company comparison — updated May 2026.
Wealth at a Glance
Net worth gap: $200.0B — equivalent to 96% of Mark's total wealth.
Tale of the Tape
Net Worth History
| Year | Dennis | Mark | Leader |
|---|---|---|---|
| 2020 | $6.1B | — | — |
| 2022 | — | $65B | — |
| 2023 | — | $170B | — |
| 2024 | $7.8B | $224.1B | Mark |
| 2025 | $7.8B | $222B | Mark |
| 2026 | $7.664B | $207.68B | Mark |
Career Highlights
Dennis Washington
- 1964Founded Washington ConstructionStarted the construction business with a loan and a single bulldozer, which grew into the largest construction firm in Montana.
- 1969Largest Contractor in MontanaWashington Construction became the largest construction firm in Montana.
- 1986Acquired Copper MineAcquired a copper and molybdenum mine in Butte, Montana, which later became highly profitable.
- 1987Montana Rail LinkLeased Burlington Northern Railroad's southern Montana route, now operating as Montana Rail Link.
- 1988Dennis & Phyllis Washington FoundationFounded the Dennis & Phyllis Washington Foundation to coordinate philanthropic efforts.
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 Dennis Washington
As of May 2026, Mark Zuckerberg leads this comparison with a net worth of $207.68B, placing at #6 in the global rankings. Dennis Washington follows at $7.664B — a gap of $200.0B.
The two leaders come from distinct industries — Construction & Engineering for Dennis Washington 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.
Dennis Washington is 91 years old versus 41 for Mark Zuckerberg, a difference of 50 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