Interactive Brokers is a fantastic business because it is basically a tech company. Its fully automated platform keeps costs low, supporting operating margins above 70% and the industry's lowest fees, and one account can trade almost anything in over 150 markets, a scale no rival matches. Its software is too complex for beginners, leaving the mass market to competitors like Robinhood, and complex international regulation is costly. It is a powerful cash machine with a great moat. x.comÂ