shares of aon plc aon rallied 104 to 28123 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 041 to 390819 and dow jones industrial average djia falling 055 to 3114530 aon plc closed 6075 short of its 52week high 34198 which the company reached on april 21st the stock demonstrated a mixed performance when compared to some of its competitors tuesday as moodys corp mco rose 123 to 28790 equifax inc efx fell 006 to 18738 and orix corp adr ix fell 232 to 7873 trading volume 823727 eclipsed its 50day average volume of 812991 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