Nasdaq OMX Group

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Nasdaq to further secure trade reference numbers

Nasdaq OMX Group Inc., operator of the Nasdaq stock exchange, will strip information from stock orders that some traders say is too revealing.

Starting Dec. 6, Nasdaq will hide reference numbers assigned to orders meant to be invisible to the market, the exchange said Thursday in an alert to traders. Some traders were concerned that sophisticated computer programs could use those reference numbers to identify a larger pattern in orders and use that to manipulate prices. Get the full story »