Massachusetts on Friday subpoenaed four brokers to obtain sales, revenue and training records for leveraged exchange-traded funds: Ameriprise, UBS, LPL and Edward Jones.

However, Amerprise, UBS and LPL had already suspended or curtailed sales of the products in recent weeks, apparently responding to investigations by the Financial Industry Regulatory Authority and Massachusetts into the products. Charles Schwab last week warned investors about the products, and Morgan Stanley Smith Barney is reviewing sales of the products.

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