From the OP Rules were established after the “flash crash” of May 2010 to govern when trades should be canceled. Knight’s buying binge did not drive up the p

From the OP Rules were established after the “flash crash” of May 2010 to govern when trades should be canceled. Knight’s buying binge did not drive up the price of the purchased stocks by more than 30 percent, the cancellation threshold, except for six stocks. Those transactions were reversed. In the other cases, the trades stood.