First Interstate BancSystem, Inc. (NASDAQ:FIBK – Get Free Report) major shareholder Susan Scott Heyneman Trust, Su sold 10,000 shares of the business’s stock in a transaction on Wednesday, October 1st. Susan Scott Heyneman Trust, Su also recently made the following trade(s):Get First Interstate BancSystem alerts:On Friday, August 1st, Susan Scott Heyneman Trust, Su sold 55,000 shares of First Interstate BancSystem stock. On Monday, July 14th, Susan Scott Heyneman Trust, Su sold 55,000 shares of First Interstate BancSystem stock. First Interstate BancSystem Stock Up 0.6%Shares of NASDAQ:FIBK opened at $31.89 on Friday. First Interstate BancSystem Dividend AnnouncementFirst Interstate BancSystem ( NASDAQ:FIBK Get Free Report ) last announced its earnings results on Tuesday, July 29th.