shares of avalonbay communities inc avb advanced 256 to 18602 monday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 045 to 432882 and dow jones industrial average djia falling 004 to 3371471 avalonbay communities inc closed 3440 below its 52week high 22042 which the company achieved on august 17th the stock underperformed when compared to some of its competitors monday as equity residential eqr rose 337 to 6446 udr inc udr rose 313 to 4149 and midamerica apartment communities inc maa rose 279 to 14970 trading volume 605464 remained 139941 below its 50day average volume of 745405 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