After disclosing Friday in a quarterly filing with the SEC it had found instances of late trading and market timing, Charles Schwab’s CEO issued a statement Monday to employees.

Out of 33 million trades that Schwab has processed since the beginning of 2001 – an average of 50,000 a day for more than 4,000 funds in the Schwab supermarket – it has only found 18 questionable instances, said David Pottruck, Schwab CEO. He warned employees that as the company’s investigation continues, that number could increase.

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