shares of dexcom inc dxcm rallied 233 to 33216 tuesday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 202 to 408885 and the dow jones industrial average djia rising 134 to 3265459 dexcom inc closed 32729 short of its 52week high 65945 which the company reached on november 18th the stock demonstrated a mixed performance when compared to some of its competitors tuesday as johnson  johnson jnj rose 042 to 17882 abbott laboratories abt rose 440 to 11454 and medtronic plc mdt rose 236 to 10626 trading volume 555716 remained 237778 below its 50day average volume of 793494 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