Heading into the quarter, analysts forecast Interactive Brokers would earn $0.45 per share (adjusted for one-time items) on sales of just under $1.4 billion. In fact, the company earned $0.51 per share -- generally accepted accounting principles ( GAAP) -- and its sales were just under $1. 5 billion.

Interactive Brokers (IBKR) stock climbed 4.8% in Thursday after-hours trading after posting better-than-expected second-quarter headline results, bolstered by higher customer trading volume.

Interactive Brokers Group Inc (IBKR) reports significant increases in commission revenue, client credit balances, and overnight trading volumes, showcasing robust growth and operational efficiency.