GREENWICH, Conn.--(BUSINESS WIRE)---- IBKR #IBKR--Interactive Brokers Group, Inc. (Nasdaq: IBKR) an automated global electronic broker, today reported its Electronic Brokerage monthly performance metrics for September. Brokerage highlights for the month included: 3.864 million Daily Average Revenue Trades (DARTs)1, 47% higher than prior year and 11% higher than prior month. Ending client equity of 757.5 billion, 40% higher than prior year and 6% higher than prior month. Ending client margin loan balances ...