shares of arthur j gallagher  co ajg advanced 110 to 19033 wednesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 028 to 414760 and the dow jones industrial average djia rising 011 to 3412805 arthur j gallagher  co closed 1204 below its 52week high 20237 which the company achieved on january 27th the stock outperformed some of its competitors wednesday as marsh  mclennan cos mmc rose 064 to 16807 trading volume 599595 remained 117372 below its 50day average volume of 716967 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