Knight Capital's aggressive introduction of software with ony a short period between approval and implementation resulted in a wave of erroneous orders resulting in losses for the brokerage firm of $440 million. These losses were incurred as Knight Capital had to sell all the stocks it accidentally bought as a result of malfunctioning software that sent out waves of wrong orders on August 1, 2012. Knight accounted for 11% of the stock traded in the U.S. in the first half of 2012, according to TABB Group. It took 45 minutes for the New York Exchange to detect the problem, identify Knight Trading as the source and shut down trading.