shares of aon plc aon slid 257 to 27372 thursday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 080 to 366578 and dow jones industrial average djia falling 030 to 3033359 the stocks fall snapped a threeday winning streak aon plc closed 6826 short of its 52week high 34198 which the company achieved on april 21st the stock demonstrated a mixed performance when compared to some of its competitors thursday as moodys corp mco fell 185 to 23741 equifax inc efx fell 617 to 15024 and orix corp adr ix fell 037 to 6991 trading volume 917166 eclipsed its 50day average volume of 772607 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