shares of dexcom inc dxcm slid 303 to 32460 monday on what proved to be an allaround mixed trading session for the stock market with the dow jones industrial average djia rising 008 to 3222342 and the sp 500 index spx falling 039 to 400801 dexcom inc closed 33485 below its 52week high 65945 which the company achieved on november 18th the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj rose 070 to 17808 abbott laboratories abt fell 015 to 10971 and medtronic plc mdt rose 111 to 10381 trading volume 679894 remained 123241 below its 50day average volume of 803135 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