Columbia Banking System, Inc. (NASDAQ:COLB - Get Free Report) Director Steven Gardner sold 10,522 shares of the business's stock in a transaction on Thursday, October 29th. The shares were sold at an average price of $31.23, for a total transaction of $328,602.06. Following the transaction, the director owned 2,577 shares in the company, valued at $80,479.71. The trade was a 80.33% decrease in their position. The transaction was disclosed in a d…