shares of marsh  mclennan cos mmc slipped 156 to 15791 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 165 to 393697 and dow jones industrial average djia falling 163 to 3203011 the stocks fall snapped a twoday winning streak marsh  mclennan cos closed 2523 short of its 52week high 18314 which the company achieved on april 21st despite its losses the stock outperformed some of its competitors wednesday as accenture plc cl a acn fell 169 to 25327 chubb ltd cb fell 219 to 19004 and american international group inc aig fell 488 to 4875true trading volume 13 m remained 435318 below its 50day average volume of 17 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