US stocks lower; Twitter falls as lock-up period expires By: CNBC.com News May 06, 2014 at 09:30 AM EDT Stocks fell Tuesday, with the Dow and S&P 500 not far from record highs, after American International Group reported a decline in profit. Read More >> Related Stocks: AMC Networks Cl A American International Group Arcelor Mittal CBS Corp Chesapeake Energy Dean Foods Company Devon Energy Duke Energy Echostar Corp Intercontinental Exchange Merck & Co Molson Coors Brewing Mondelez International Monster Beverage NVIDIA Corp News Corporation Precision Castparts Prudential Financial Ralph Lauren Corp Sentinelone Inc Cl A Shutterstock Inc Symantec Corp Telefonica S.A. ADR The Priceline Group Toyota Motor Corp Ltd Ord ADR Transocean Ltd Twitter, Inc.