shares of arthur j gallagher  co ajg slipped 089 to 19561 monday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 010 to 410911 and the dow jones industrial average djia rising 030 to 3358652 the stocks fall snapped an 11day winning streak arthur j gallagher  co closed 676 below its 52week high 20237 which the company reached on january 27th the stock underperformed when compared to some of its competitors monday as marsh  mclennan cos mmc fell 074 to 16813 trading volume 777893 remained 211537 below its 50day average volume of 989430 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