shares of dexcom inc dxcm inched 004 higher to 8203 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 041 to 390819 and dow jones industrial average djia falling 055 to 3114530 dexcom inc closed 8283 below its 52week high 16486 which the company achieved on november 18th the stock demonstrated a mixed performance when compared to some of its competitors tuesday as johnson  johnson jnj rose 027 to 16318 abbott laboratories abt rose 020 to 10271 and medtronic plc mdt fell 115 to 8620 trading volume 17 m remained 10 million below its 50day average volume of 27 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