GREENWICH, Conn.--(BUSINESS WIRE)--Interactive Brokers Group, Inc. (NASDAQ GS: IBKR) an automated global electronic broker and market maker, today reported its Electronic Brokerage monthly performance metrics for May. Highlights for the month included: 617 thousand Daily Average Revenue Trades (DARTs), 19% higher than prior year and 2% lower than prior month. Ending client equity of $66.7 billion, 31% higher than prior year and 2% higher than prior month. Ending client margin loan balances of $