Key TakeawaysSweetgreen reported a wider-than-expected loss for the third quarter as costs rose.The company spent more as it expanded its locations, and also faced higher labor expenses.Shares tumbled Friday, though even with Friday's drop, they've more than tripled in value since the start of the year. Shares of Sweetgreen (SG) tumbled in Friday afternoon trading after the salad restaurant chain reported a wider-than-anticipated loss as costs rose. Sweetgreen posted a third-quarter loss of 18 cents per sh ...