Mark Zuckerberg vs Denis O'Brien: who is richer?
Mark Zuckerberg is richer, with a net worth of $209.7 billion versus Denis O'Brien's $3.09 billion — a gap of $206.6 billion, or 68 times as much (as of November 7, 2026).
Mark Zuckerberg
Source of wealth: Facebook
$209.7B
Denis O'Brien
Source of wealth: Telecom
$3.09B
Made since you opened this page: $0.00
Side-by-side
| Mark Zuckerberg | Denis O'Brien | |
|---|---|---|
| Net worth | $209.7B | $3.09B |
| World rank | #5 | #1349 |
| Makes per second | −$124 | $1.86 |
| Makes per day | −$10.69M | $160,988 |
| Today | +$1.72B | −$105,683 |
| Source of wealth | Telecom | |
| Age | 42 | 68 |
| Country | United States | Ireland |
Net worth by year
| Year | Mark Zuckerberg | Denis O'Brien |
|---|---|---|
| 2026 | $222B | $3.1B |
| 2025 | $216B | $3B |
| 2024 | $177B | $2.8B |
| 2023 | $64.4B | $2.7B |
| 2022 | $67.3B | $3.8B |
| 2021 | $97B | $4.6B |
| 2020 | $54.7B | $2.9B |
| 2019 | $62.3B | $4B |
| 2018 | $71B | $4.6B |
| 2017 | $56B | $4.7B |
| 2016 | $44.6B | $5.7B |
| 2015 | $33.4B | $6.8B |
Frequently asked questions
Who is richer, Mark Zuckerberg or Denis O'Brien?
Mark Zuckerberg is richer, worth $209.7 billion compared with Denis O'Brien's $3.09 billion. The difference is $206.6 billion.
Who makes more per second, Mark Zuckerberg or Denis O'Brien?
Denis O'Brien makes more: about $1.86 per second versus −$124. Per day that's $160,988 vs −$10.69M.
How many times richer is Mark Zuckerberg than Denis O'Brien?
Mark Zuckerberg has about 68 times Denis O'Brien's net worth.