shares of american tower reit amt slumped 014 to 19287 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 016 to 397127 and dow jones industrial average djia falling 012 to 3239425 this was the stocks second consecutive day of losses american tower reit closed 8960 short of its 52week high 28247 which the company reached on august 15th the stock demonstrated a mixed performance when compared to some of its competitors tuesday