Interactive Brokers Group, Inc.
An automated electronic brokerage serving individual investors, advisors, and hedge funds, Interactive Brokers lets clients trade stocks, options, futures, forex, bonds, and crypto from one platform through tiers like IBKR Pro and commission-free IBKR Lite. It traces back to Hungarian immigrant Thomas Peterffy, who started as a market maker in 1977 and later turned his Timber Hill trading systems into an outside brokerage in 1993. A technology pioneer, Peterffy built what is considered the first handheld computer for trading floors.
Estimated from filings — the split-adjusted price range over the quarters each manager built the position. A range, not a fill price; 13F reports a quarter-end snapshot, not a trade date.