About
Thomas Peterffy is a Hungarian-born American billionaire businessman. He is the founder, chairman and the largest shareholder of Interactive Brokers. As of November 2025, his estimated net worth is US$109 billion, making him the 18th richest person in the world.
Adapted from Wikipedia (CC BY-SA 4.0).
Milestones, by age
Dated facts from Wikidata; ages marked “about” come from year-only dates.
- ~50Founded Interactive Brokers1994
Reported wealth
Each figure is a dated estimate from the publisher shown; wealth changes, and nothing here is live.
| As of | Estimate | Source |
|---|---|---|
| November 2025 | $109B | Forbes · current |
| 2019 | $17.1B | Forbes |
Sources
Every fact on this page traces to one of these.
Sources (4)
- Thomas Peterffy (Q7793127) · Wikidata
- Thomas Peterffy · Wikipedia
- Thomas Peterffy — Forbes net worth (via Wikidata) · Forbes · 2019
- Thomas Peterffy — Forbes net worth (stated on Wikipedia) · Forbes · 2025
Also born on September 30
Notable birthday twins
- Janice McNair · 1936–2026 · Entrepreneur
- Andy Bechtolsheim · 1955 · Entrepreneur
- Stephen Cohen · 1982 · Entrepreneur
- Monica Bellucci · 1964 · Actor
- Kieran Culkin · 1982 · Actor
- Marion Cotillard · 1975 · Actor