Thomas Siebel Net Worth
Source of wealth: Business software
$4.57B
+$7.94M(+0.2%) today
Live · · Forbes real-time
Thomas Siebel's net worth is $4.57 billion as of November 7, 2026, according to Forbes' real-time data, which makes Thomas Siebel the 935th richest person in the world.
Made since you opened this page
$0.00⏱ 00:00:00 on this page$9.26 per second · based on net worth growth
Spend Thomas Siebel's money →How much does Thomas Siebel make per second, hour and day?
Per second
$9.26
Per minute
$555
Per hour
$33,318
Per day
$799,635
Per week
$5.6M
Per year
$292.1M
Basis: Forbes 2025 World's Billionaires list → Forbes Real-Time Billionaires. How we calculate this
How long it takes Thomas Siebel to earn…
- a Big Mac0.65 seconds
- an iPhone 17 Pro Max3.6 minutes
- the median US salary1.9 hours
- a Tesla Model S Plaid2.9 hours
- an average US home12.6 hours
- a Bugatti23.4 days
- a superyacht1.0 years
How did Thomas Siebel get so rich?
Thomas Siebel, whose fortune comes from Business software, has an estimated net worth of $4.57 billion. That ranks 935th on Forbes' live list of the world's billionaires. Citizenship: United States (based in Woodside, California).
Since April 2025, when Forbes measured it at $4.1 billion, Thomas Siebel's fortune has grown by $467.8 million — an average of $9.26 per second, or $799,635 per day.
Thomas Siebel's net worth was $2.3 billion on Forbes' 2015 list, so it has grown about 2.0x since then.
Thomas Siebel net worth history (2015–2026)
| Year | Net worth | Change |
|---|---|---|
| 2026 | $3.9B | −$200M |
| 2025 | $4.1B | +$200M |
| 2024 | $3.9B | +$400M |
| 2023 | $3.5B | $0 |
| 2022 | $3.5B | −$1.4B |
| 2021 | $4.9B | +$1.3B |
| 2020 | $3.6B | +$700M |
| 2019 | $2.9B | $0 |
| 2018 | $2.9B | +$400M |
| 2017 | $2.5B | +$300M |
| 2016 | $2.2B | −$100M |
| 2015 | $2.3B | — |
Ranked near Thomas Siebel
| # | Name | Net worth | Today | Per second | Country |
|---|---|---|---|---|---|
| 932 | Lee Yeow ChorPalm oil, property | $4.59B | −$56.42M(−1.2%) | $29.57/s | Malaysia |
| 933 | Sid BassOil, investments | $4.58B | +$5.45M(+0.1%) | $19.36/s | United States |
| 934 | Zhang YongRestaurants | $4.57B | −$5.49M(−0.1%) | −$40.15/s | Singapore |
| 935 | Thomas SiebelBusiness software | $4.57B | +$7.94M(+0.2%) | $9.26/s | United States |
| 936 | Hans Peter WildFlavorings | $4.57B | — | $21.10/s | Switzerland |
| 937 | Bob ParsonsWeb hosting | $4.56B | — | $13.04/s | United States |
| 938 | Edward Stack & familyDick's Sporting Goods | $4.55B | −$5.95M(−0.1%) | −$14.84/s | United States |
Compare Thomas Siebel with…
Thomas Siebel net worth: FAQs
What is Thomas Siebel's net worth?
Thomas Siebel's net worth is $4.57 billion as of November 7, 2026, according to Forbes' real-time data, which makes Thomas Siebel the 935th richest person in the world.
How much does Thomas Siebel make per second?
About $9.26 per second. Since April 2025, when Forbes measured it at $4.1 billion, Thomas Siebel's fortune has grown by $467.8 million — an average of $9.26 per second, or $799,635 per day.
How much does Thomas Siebel make a day?
Roughly $799,635 per day — that's $33,318 an hour and $555 a minute, based on average net worth growth.
How did Thomas Siebel make their money?
The main sources of Thomas Siebel's wealth are: Business software. Forbes classifies the fortune as self-made.
How much did Thomas Siebel's net worth change today?
Thomas Siebel's net worth rose by $7.94 million compared with the previous trading day, according to Forbes' real-time estimate on November 7, 2026.
How long would it take an average person to earn Thomas Siebel's net worth?
A typical full-time US worker earning about $63,128 a year would need roughly 72,358 years to earn Thomas Siebel's fortune — without spending a cent.
How old is Thomas Siebel?
Thomas Siebel is 73 years old and is a citizen of United States.
Sources
- Net worth: Forbes Real-Time Billionaires (source), refreshed every 15 minutes.
- History: Forbes World's Billionaires lists, 2015–2026.
- Per-second figures are averages. See our methodology.