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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.