(Bloomberg) -- UBS said the U.S. Securities and Exchange Commission has been investigating its dark pool since early 2012, the first time the Swiss bank has acknowledged the probe now in itsthird year.

The investigation concerns some features of the private trading venue that were discontinued two years ago, including “certain order types and disclosure practices,” the Zurich- based bank said in the litigation note in its quarterly report today. UBS said it has also received inquiries from the New York attorney general and the Financial Industry Regulatory Authority. It said it is cooperating with all the investigations.

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