This article was automatically generated by Dow Jones using technology from Automated Insights.

Shares of Aon PLC slipped 9.5% to $321.52 on what proved to be an all-around grim trading session for the stock market, with the S&P 500 Index falling 0.3% to 7,686.14 and Dow Jones Industrial Average falling 0.7% to 53,185.90.

Aon PLC closed 15.9% short of its 52-week high of $382.34, which the company achieved on July 28th.

The stock underperformed when compared to some of its peers, as Marsh fell 1.5% to $189.80, MetLife Inc. fell 1.4% to $95.17, and Arthur J. Gallagher & Co. fell 2.02% to $262.15.

Trading volume totaled 2.4 million, compared to the 50-day average of 1.3 million.

Data source: Dow Jones Market Data, FactSet