shares of arthur j gallagher  co ajg slipped 082 to 19468 thursday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 147 to 417976 and the dow jones industrial average djia falling 011 to 3405394 the stocks fall snapped a threeday winning streak arthur j gallagher  co closed 769 below its 52week high 20237 which the company achieved on january 27th the stock underperformed when compared to some of its competitors thursday as marsh  mclennan cos mmc fell 008 to 17532 trading volume 12 m eclipsed its 50day average volume of 755204 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