Finance · Profile from Finance Research Companion
Interactive Brokers Group, Inc.
The Greenwich, Connecticut broker built by Thomas Peterffy, a Hungarian-born programmer who bought a seat on the American Stock Exchange in 1977 and spent the next five decades replacing floor traders, back-office clerks and sales staff with software. Interactive Brokers began as Timber Hill, an options market maker that priced trades with computer models and handheld devices; it turned that technology outward in 1993 to serve professional traders, listed in a Dutch-auction IPO in 2007, quit market making in 2017, and became the lowest-cost, most automated global brokerage of its era. By September 2026 it served ~5.58 million accounts holding ~$965bn of customer equity across 160+ markets, with pre-tax margins in the high 70s per cent, far above any other broker. It is the quiet counter-example to the "free trading" story: it rarely advertises zero commissions, sells little through human advisers, and earns most of its money from the interest spread on customer cash and margin loans.
At a glance
- Founded
- 1977–78 (Peterffy's AMEX options seat and trading business, reported); Timber Hill formed 1982; Interactive Brokers brokerage launched 1993
- Headquarters
- One Pickwick Plaza, Greenwich, Connecticut; large operations in Chicago, Hong Kong, Budapest, Zug, Mumbai and elsewhere
- Ownership / structure
- Interactive Brokers Group, Inc. (Nasdaq: IBKR), a holding company whose main asset is a stake in IBG LLC; Thomas Peterffy and employees own most of IBG LLC through IBG Holdings LLC, and the public float has risen gradually since the 2007 IPO (company)
- Leadership (2026)
- Thomas Peterffy, founder and chairman; Milan Galik, CEO (since October 2019); Paul Brody, CFO
- Segment
- Exchange & infrastructure / fintech: global electronic broker-dealer and futures commission merchant (stocks, options, futures, FX, bonds, funds, crypto, forecast contracts); clearing for introducing brokers and advisers
- Scale (Q3 2026)
- ~5.58m customer accounts (+35% y/y); customer equity ~$964.7bn (+27%); customer credit balances ~$186.2bn; margin loans ~$105.2bn (company, 15 October 2026)
- Profit
- 2025: net revenues >$6bn (first time; ~$6.2bn reported), record pre-tax margin ~77%, commissions ~$2.1bn, net interest income ~$3.6bn (company, January 2026)
- Index
- Joined the S&P 500 on 28 August 2025, replacing Walgreens Boots Alliance (S&P Dow Jones Indices)
- Signature moves (incl. failures)
- AMEX seat and Timber Hill (1977–82); launch of Interactive Brokers (1993); Dutch-auction IPO (2007); Swiss franc shock loss (2015); exit from market making (2017); IBKR Lite (2019); AML settlements (2020) and OFAC settlement (2025); GameStop restrictions (2021); ForecastEx prediction markets (2024); S&P 500 entry and record growth (2025–26)
10 strategic moves analysed
Each one gets a full strategy file in the companion: context, the decision, the financing, what happened, and the lesson.
1977
AMEX Seat and Timber Hill
Founding
1993
Interactive Brokers Electronic Brokerage Launch
Launch
2007
Dutch Auction IPO
IPO
2015
Swiss Franc Shock Losses
Failure (customer credit loss)
2017
Exit from Market Making
Divestiture / pivot
2019
IBKR Lite Zero Commissions
Pricing change / launch
2020
AML Failures and 38m Settlements
Regulatory settlement
2021
GameStop Restrictions and Peterffy Warning
Risk action / controversy
2024
ForecastEx Prediction Markets
Launch
2025
S and P 500 Entry and Record Growth
Growth / milestone (index inclusion, stock split, stablecoin funding, dividend increase)