United StatesFounded it
Thomas Peterffy
Thomas Peterffy founded the electronic brokerage Interactive Brokers in 1977 and chairs it; his fortune is his controlling stake in the company, held through IBG Holdings.
- Forbes estimate
- $107B
- Forbes, 5 Sep 2026
- Forbes rank
- No. 20
- 5 Sep 2026
- Stake in Interactive Brokers
- 67.5%
- Net worth, Bloomberg
- $104B
- Bloomberg, 11 Oct 2026
- Born
- 1944
- Budapest, Hungary
- Education
- Left university without a degree
- Attended the College of Surveying in Hungary; studied at New York University without finishing
- Giving Pledge
- Not a signer
Where the fortune sits
Interactive Brokers stock, held through IBG Holdings
Interactive Brokers
electronic brokerage, founded 1977
73.7% of the votes
Calculated: he and his affiliates own about 91.6% of the economic interests in IBG Holdings, which owns about 73.7% of IBG LLC; he also owns 6,219,110 Class A shares (1.40%) of the listed parent
DEF 14A proxy statement; Form 10-K, 9 Mar 2026
Founder and chairman
Other holdings
Newsmax
About 18% through his holding company Conyers Investments, per Bloomberg citing a March 2025 Form 3
Land in Florida
More than 560,000 acres, mostly in Florida, per Forbes
Where Thomas stands among 73
Everyone on the site, grouped by their answer. Thomas Peterffy is outlined.
How the fortune started
Founded it
Founded it 42
Inherited and grew it 12
Built it up 8
Inherited it 6
Through marriage 5
Industry
Finance
Finance 10
Technology 24
Several industries 9
Metals and mining 6
Retail 4
Fashion and beauty 4
Media 3
Food and drink 3
Shipping 3
Crypto 2
Oil, gas and chemicals 2
Healthcare 1
Casinos and resorts 1
Property and sports 1
Giving Pledge
Not a signer
Not a signer 61
Signed 11
Not stated 1
Education
Left university without a degree
Left university without a degree 6
Bachelor's degree 27
Graduate degree 24
No university 5
Not stated 11
Role today
Chair, board or owner
Chair, board or owner 25
Runs the company 32
Founder, no executive role 8
No role 4
Retired 4
The person
- Born
- 1944Budapest, Hungary
- Citizenship
- United States
- Lives in
- Palm Beach, Florida, United States
- Education
- Left university without a degreeAttended the College of Surveying in Hungary; studied at New York University without finishing
- Parents
- Descended from Hungarian aristocrats who lost nearly everything under Soviet rule; arrived in the US in 1965 at 21 with no money
What they give
- Giving Pledge
- Not a signer
- Foundation
- Peterffy FoundationEstablished by Peterffy and run by his children; funds the Living Forest Project, Reweaving the Web and One Small Planet
- Lifetime giving
- Not stated
Role and record
- Role now
- Chair of the boardFounder and chairman of Interactive Brokers
- Successor
- Milan Galik succeeded him as CEO in 2019
- Public office
- None found
- Legal record
- 1980, American Stock ExchangeSettled an exchange disciplinary matter over exceeding options position limits (Rule 904) with a $500 fine, per his FINRA BrokerCheck report.
