shares of arthur j gallagher  co ajg dropped 045 to 20534 tuesday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 024 to 428385 and the dow jones industrial average djia rising 003 to 3357328 arthur j gallagher  co closed 1389 below its 52week high 21923 which the company reached on may 15th the stock underperformed when compared to some of its competitors tuesday as marsh  mclennan cos mmc fell 040 to 17646 trading volume 422776 remained 476056 below its 50day average volume of 898832 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