shares of american tower reit amt shed 048 to 19002 thursday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 062 to 429393 and the dow jones industrial average djia rising 050 to 3383361 american tower reit closed 9245 below its 52week high 28247 which the company reached on august 15th the stock underperformed when compared to some of its competitors thursday as crown castle inc cci rose 057 to 11556 and sba communications corp sbac rose 055 to 22898 trading volume 12 m remained 795766 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