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Shares of Aon PLC (AON) slid 1.77% to $340.05 Wednesday, on what proved to be an all-around great trading session for the stock market, with the S&amp;P 500 Index  rising 0.67% to 6,886.68 and the Dow Jones Industrial Average  rising 1.05% to 48,057.75.
Aon PLC closed 17.66% short of its 52-week high of $412.97, which the company reached on March 3rd.
The stock underperformed when compared to some of its competitors Wednesday, as Marsh &amp; McLennan Cos. (MMC) fell 0.18% to $180.93, MetLife Inc. (MET) rose 2.57% to $79.82, and Arthur J. Gallagher &amp; Co. (AJG) rose 0.23% to $240.45.
Trading volume (1.3 M) eclipsed its 50-day average volume of 1.2 M.
Data source: Dow Jones Market Data, FactSet. Data compiled December 10, 2025.
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(END) Dow Jones Newswires
12-10-25 1643ET

<p>Aon PLC's stock fell 1.77% to $340.05 on Wednesday, underperforming compared to competitors like Marsh & McLennan, MetLife, and Arthur J. Gallagher. The S&P 500 and Dow Jones both rose, with Aon closing 17.66% below its 52-week high. Trading volume was 1.3 million, above the 50-day average of 1.2 million.</p>

Aon PLC Stock Underperforms Wednesday When Compared To Competitors