shares of aon plc aon slipped 052 to 29213 thursday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 016 to 447375 and dow jones industrial average djia falling 018 to 3475132 aon plc closed 310 below its 52week high 29523 which the company achieved on september 13th the stock underperformed when compared to some of its competitors thursday as moodys corp mco rose 014 to 38033 equifax inc efx rose 033 to 27400 and orix corp adr ix rose 027 to 9965 trading volume 803275 remained 13 million below its 50day average volume of 21 m 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