shares of aon plc aon inched 054 higher to 31868 tuesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 146 to 407660 and the dow jones industrial average djia rising 109 to 3408604 the stocks rise snapped a twoday losing streak aon plc closed 2330 short of its 52week high 34198 which the company reached on april 21st