shares of aon plc aon shed 124 to 30614 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 061 to 399532 and dow jones industrial average djia falling 042 to 3396635 the stocks fall snapped a twoday winning streak aon plc closed 3584 below its 52week high 34198 which the company achieved on april 21st