shares of arthur j gallagher  co ajg advanced 176 to 20568 friday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 145 to 428237 and the dow jones industrial average djia rising 212 to 3376276 this was the stocks second consecutive day of gains arthur j gallagher  co closed 1355 short of its 52week high 21923 which the company achieved on may 15th the stock outperformed some of its competitors friday as marsh  mclennan cos mmc rose 114 to 17640 trading volume 657530 remained 258187 below its 50day average volume of 915717 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