Shares of Interactive Brokers Group Inc. /zigman2/quotes/208880397/composite IBKR -4.02% rose 6.9% in afternoon trading Monday, after the trade execution company, announced its January brokerage metrics, which included a more than tripling in daily average revenue trades (DARTs). The company, which services traders including individual investors, hedge funds, proprietary trading groups and financial advisors, said January DARTs totaled 3,295, up 223% from the same period a year ago, and up 43% from December. Client margin loan balances at month end were $40.8 billion, up 49% from a year ago and 5% higher than at the end of December. The average order size during January was 2,326 shares for stocks, 6.7 contracts for equity options and 2.8 contracts for futures. The average commission per cleared commissionable order was $2.44. The broker's stock has rallied 37.5% over the past three months, while the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.68% has gained 15.4%.