Exhibit 99.1 INTERACTIVE BROKERS GROUP ANNOUNCES 2Q2025 RESULTS GAAP DILUTED EPS OF $0.51, ADJUSTED1 EPS OF$0.51 GAAP NET REVENUES OF $1,480 MILLION, ADJUSTED NET REVENUES OF$1,480 MILLION Reported and adjusted net revenues were both $1,480 million for the current quarter. For the year-ago quarter, reported net revenues were$1,230 million and $1,290 million as adjusted. Reported and adjusted income before income taxes were both$1,104 million for the current quarter. For the year-ago quarter, reported in ...