shares of american tower reit amt slid 267 to 20465 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 200 to 399734 and dow jones industrial average djia falling 206 to 3312959 this was the stocks third consecutive day of losses american tower reit closed 7782 below its 52week high 28247 which the company reached on august 15th despite its losses the stock outperformed some of its competitors tuesday as crown castle inc cci fell 286 to 13666 and sba communications corp sbac fell 300 to 27279 trading volume 19 m eclipsed its 50day average volume of 18 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