Rank 28 of 28
Thomas Peterffy
wealth created by Interactive Brokers Group, Inc.1$33.5B
− kept (Forbes RTB)−$100.4Bcreated for others−$66.9BCreated $33.5B in total
Stake, per the filings
| Company | Ownership | As of | Strict stake value |
|---|---|---|---|
| IBKR1 | 73.70% | 2026-03-09 | n/m* |
* not meaningful: the recorded ownership is of unlisted partnership units or deemed-beneficial holdings, so multiplying it by the public market cap would overstate the stake. See “Stated plainly” below.
Stated plainly
- Up-C: 73.7% is deemed beneficial ownership via IBG Holdings LLC; aggregates other members' economic interests - his personal economic % not disclosed. Strict-stake display must flag this.
- No published lifetime-giving total; foundation ~$178M endowment.
- No published lifetime-giving total; see https://www.insidephilanthropy.com/home/will-this-81-year-old-trading-billionaires-fortune-seed-a-new-megafunder
Sources
- 1.Attribution weight — sole tracked founder of this company www.sec.gov/Archives/edgar/data/1381197/000138119726000066/ibkr-2026031
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