Exhibit 99.1 INTERACTIVE BROKERS GROUP ANNOUNCES 4Q2025 RESULTS GAAP DILUTED EPS OF $0.63, ADJUSTED1 EPS OF$0.65 GAAP NET REVENUES OF $1.64 BILLION, ADJUSTED NET REVENUES OF$1.67 BILLION GREENWICH, CT, January 20, 2026 — Interactive Brokers Group, Inc. (Nasdaq: IBKR), an automated global electronic broker, announced results for the quarter ended December 31, 2025. Reported diluted earnings per share were $0.63 for the current quarter and$0.65 as adjusted. For the year-ago quarter, reported diluted earnin ...