PowerShares Becomes Latest Competitor In Plain Vanilla Fee War By: Benzinga via Benzinga September 25, 2017 at 08:57 AM EDT Invesco Ltd.'s (NYSE: IVZ) PowerShares unit is the fourth-largest U.S. issuer of exchange-traded funds. PowerShares had over $130.1 ... Read More >> Related Stocks: INVESCO Ltd PowerShares QQQ