KEY TAKEAWAYSKohl's shares are falling in premarket trading after the department store chain said that Chief Executive Officer (CEO) Tom Kingsbury is stepping down after less than two years running the struggling retailer.Kingsbury will leave his post on Jan. 15 and be replaced by Ashley Buchanan, CEO of The Michaels Companies.Kohl's has been struggling with falling sales and its shares are down by almost a third this year. Kohl's (KSS) shares are falling 3.5% in premarket trading after the department store ...