ToplineKrispy Kreme stock surged Monday after analysts from Truist turned upgraded the stock to buy and claimed investors are "undervaluing" the business potential of an upcoming deal with McDonald’s that will see the company's doughnuts sold at thousands of locations of the world's largest fast food chain.Doughnuts are sold at a Krispy Kreme store on May 5, 2021 in Chicago, Illinois. Getty Images Key FactsShares of the stock were up almost 6.5% to Monday morning upon the upgrade, which also saw analyst Bil ...