shares of tmobile us inc tmus slid 299 to 12496 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 281 to 417520 and dow jones industrial average djia falling 238 to 3324018 tmobile us inc closed 2524 short of its 52week high 15020 which the company achieved on july 16th the stock underperformed when compared to some of its competitors tuesday as verizon communications inc vz fell 173 to 4941 att inc t fell 108 to 1930 and america movil sab de cv adr series l amx fell 080 to 2097 trading volume 62 m eclipsed its 50day average volume of 49 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