shares of aon plc aon slid 100 to 33583 wednesday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 074 to 447216 and the dow jones industrial average djia rising 025 to 3434743 aon plc closed 1154 short of its 52week high 34737 which the company achieved on june 30th trading volume 600860 remained 216442 below its 50day average volume of 817302 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