shares of dexcom inc dxcm advanced 121 to 29632 monday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 031 to 412143 and the dow jones industrial average djia rising 005 to 3291578 dexcom inc closed 36313 below its 52week high 65945 which the company reached on november 18th the stock outperformed some of its competitors monday as johnson  johnson jnj fell 001 to 17640 abbott laboratories abt fell 013 to 11642 and medtronic plc mdt rose 001 to 9549 trading volume 974487 eclipsed its 50day average volume of 933422 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