The performance of the Interactive Brokers Group IBKR stock has been impressive this year. Its shares have rallied 47.2%, outperforming the industry’s 38.5% growth and the S&P 500 Index’s 19.7% rise.

Interactive Brokers is gaining market share around the world. The brokerage's superior value proposition is leading customers to switch to its services. It has some of the best profit margins in the ...