Russell Investments Group Ltd. acquired a new stake in Heartland Financial USA, Inc. (NASDAQ:HTLF - Get Rating) in the 4th quarter, according to the company in its most recent Form 13F filing with the Securities and Exchange Commission (SEC). The firm acquired 13,600 shares of the bank's stock, valued at approximately $634,000. Several other hedge funds and other institutional investors have also made changes to their positions in the business. Oppenheimer & Co. Inc. boosted its stake in shares of Heartland Financial USA by 153.2% in the fourth quarter. Oppenheimer...