Nasdaq cancels some trades

Stock exchange operator Nasdaq OMX is cancelling a series of premarket trades that resulted in wild price swings in a number of stocks yesterday, including Citigroup and Hewlett-Packard, the exchange said. Nasdaq said in a statement it is cancelling trades in nine stocks in which trades occurred at prices that marked a swing of 10 per cent or more from Wednesday's closing prices. AT&T was also affected.