American Century Companies Inc. grew its stake in shares of Heartland Financial USA, Inc. (NASDAQ:HTLF - Free Report) by 12.8% during the 1st quarter, according to the company in its most recent 13F filing with the SEC. The institutional investor owned 284,511 shares of the bank's stock after buying an additional 32,331 shares during the quarter. American Century Companies Inc. owned 0.67% of Heartland Financial USA worth $10,914,000 at the end of the most recent quarter. Other institutional investors and hedge funds have also recently made changes to their positions...