U.S. stock futures were slightly lower this morning, with the Nasdaq futures falling around 0.2% on Friday.Shares of Sweetgreen, Inc. SG fell sharply in today's pre-market trading after the company reported worse-than-expected quarterly financial results.Sweetgreen reported a quarterly loss of 18 cents per share, compared to market expectations for a loss of 16 cents per share. The company reported quarterly sales of $173.400 million which missed the analyst consensus estimate of $175.533 million.Sweetgreen ...