S&P 500 Gains and Losses Today: Huntington Ingalls Stock Sinks as Shipbuilder Cuts Outlook

Key TakeawaysThe S&P 500 dropped 1.9% on Thursday, Oct. 31, as signs of major firms spending big bucks to build out their AI platforms weighed on the tech sector.Huntington Ingalls shares sank after the military shipbuilder missed quarterly profit estimates and cut its full-year sales forecast.Labor market strength helped drive a strong quarter for HR and payroll services provider Paycom Software, and its shares surged. Major U.S. equities indexes never found a festive mood in the Halloween trading session, ...