Mark Zuckerberg vs Thomas Siebel: who is richer?
Mark Zuckerberg is richer, with a net worth of $209.7 billion versus Thomas Siebel's $4.57 billion — a gap of $205.2 billion, or 46 times as much (as of November 7, 2026).
Mark Zuckerberg
Source of wealth: Facebook
$209.7B
Thomas Siebel
Source of wealth: Business software
$4.57B
Made since you opened this page: $0.00
Side-by-side
| Mark Zuckerberg | Thomas Siebel | |
|---|---|---|
| Net worth | $209.7B | $4.57B |
| World rank | #5 | #935 |
| Makes per second | −$124 | $9.26 |
| Makes per day | −$10.69M | $799,663 |
| Today | +$1.72B | +$7.94M |
| Source of wealth | Business software | |
| Age | 42 | 73 |
| Country | United States | United States |
Net worth by year
| Year | Mark Zuckerberg | Thomas Siebel |
|---|---|---|
| 2026 | $222B | $3.9B |
| 2025 | $216B | $4.1B |
| 2024 | $177B | $3.9B |
| 2023 | $64.4B | $3.5B |
| 2022 | $67.3B | $3.5B |
| 2021 | $97B | $4.9B |
| 2020 | $54.7B | $3.6B |
| 2019 | $62.3B | $2.9B |
| 2018 | $71B | $2.9B |
| 2017 | $56B | $2.5B |
| 2016 | $44.6B | $2.2B |
| 2015 | $33.4B | $2.3B |
Frequently asked questions
Who is richer, Mark Zuckerberg or Thomas Siebel?
Mark Zuckerberg is richer, worth $209.7 billion compared with Thomas Siebel's $4.57 billion. The difference is $205.2 billion.
Who makes more per second, Mark Zuckerberg or Thomas Siebel?
Thomas Siebel makes more: about $9.26 per second versus −$124. Per day that's $799,663 vs −$10.69M.
How many times richer is Mark Zuckerberg than Thomas Siebel?
Mark Zuckerberg has about 46 times Thomas Siebel's net worth.