William MacMillan vs Mark Zuckerberg
Real-time net worth, career, and company comparison — updated July 2026.
Wealth at a Glance
Net worth gap: $206.0B — equivalent to 99% of Mark's total wealth.
Tale of the Tape
Career Highlights
William MacMillan
- 1953Joined CargillJoined Cargill, a privately held global food corporation.
- 1930-2006Board MemberServed as a board member of Cargill for three decades.
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.
Net Worth History
| Year | William | Mark | Leader |
|---|---|---|---|
| 2022 | — | $65B | — |
| 2023 | — | $170B | — |
| 2024 | $1.7B | $224.1B | Mark |
| 2025 | $1.7B | $222B | Mark |
| 2026 | $1.73B | $207.68B | Mark |
The Verdict: Mark Zuckerberg vs William MacMillan
As of July 2026, Mark Zuckerberg leads this comparison with a net worth of $207.68B, placing at #6 in the global rankings. William MacMillan follows at $1.73B — a gap of $206.0B.
The two leaders come from distinct industries — food-beverage for William MacMillan 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.
William MacMillan is 71 years old versus 41 for Mark Zuckerberg, a difference of 30 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
Net worth estimates updated daily from public financial disclosures. Methodology · Report an error