shares of american tower reit amt slipped 226 to 19104 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 064 to 410990 and dow jones industrial average djia falling 101 to 3301214 this was the stocks second consecutive day of losses american tower reit closed 9143 short of its 52week high 28247 which the company achieved on august 15th the stock underperformed when compared to some of its competitors tuesday as crown castle inc cci fell 215 to 11145 and sba communications corp sbac fell 148 to 23179 trading volume 14 m remained 584246 below its 50day average volume of 20 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