shares of general motors co gm slumped 044 to 3413 monday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 020 to 427379 and dow jones industrial average djia falling 059 to 3356286 general motors co closed 950 below its 52week high 4363 which the company reached on february 16th the stock underperformed when compared to some of its competitors monday as tesla inc tsla rose 170 to 21761 trading volume 100 m remained 37 million below its 50day average volume of 137 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use