Washington Trust Bank lessened its stake in shares of Costco Wholesale Co. (NASDAQ:COST – Free Report) by 4.0% in the fourth quarter, HoldingsChannel.com reports. The firm owned 30,939 shares of the retailer’s stock after selling 1,293 shares during the quarter. Costco Wholesale comprises approximately 1.8% of Washington Trust Bank’s holdings, making the stock its 12th […]