shares of dexcom inc dxcm slid 267 to 49249 monday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 169 to 441253 and dow jones industrial average djia falling 119 to 3430808 this was the stocks second consecutive day of losses dexcom inc closed 16696 below its 52week high 65945 which the company reached on november 18th the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj fell 125 to 17984 abbott laboratories abt fell 260 to 12004 and medtronic plc mdt fell 084 to 11152 trading volume 490593 remained 341988 below its 50day average volume of 832581 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