Key TakeawaysThe S&P 500 slipped 0.2% on Friday, Sept. 20, receding from the record high it printed after this week's interest-rate cut by the Federal Reserve.FedEx shares dropped after the package delivery giant missed quarterly estimates and reduced its full-year guidance, citing soft demand.Constellation Energy said it will restart operations at a shuttered nuclear plant to provide clean energy for Microsoft data centers, and shares of the utility soared. Major U.S. equities indexes were mixed on the fin ...