shares of sba communications corp sbac shed 555 to 32310 monday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 320 to 399124 and dow jones industrial average djia falling 199 to 3224570 this was the stocks third consecutive day of losses sba communications corp closed 6805 below its 52week high 39115 which the company achieved on december 31st the stock underperformed when compared to some of its competitors monday as american tower reit amt fell 532 to 23109 crown castle international corp cci fell 395 to 17538 and us cellular corp usm rose 034 to 2979 trading volume 513508 remained 185504 below its 50day average volume of 699012 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