Aon stock heads into the open after a 1.0 percent gain

At the close on September 10, 2026, Aon stock finished at USD 307.77 on the NYSE, up 1.0 percent. The move came with the S&P 500 down 0.6 percent, and Aon also traded near its 52-week low.

Aon stock closed at USD 307.77 on the NYSE on September 10, 2026, up 1.0 percent. The shares also finished above the session open of USD 304.82 and near the bottom of their one-year range.

September 10, 2026 recap

Aon plc (ISIN IE00BLP1HW54, NYSE: AON) ended the last session at USD 307.77 after opening at USD 304.82, while its 52-week range stood at USD 303.59 to USD 382.34. The close left the stock USD 3.95 above the 52-week low and 19.5 percent below the 52-week high.

The broader market was weaker on the same day. Reuters said the S&P 500 ended down 0.58 percent at 7,591.70 after U.S. inflation worries and higher Treasury yields pressured Wall Street.

Today in focus

Aon was due on September 10, 2026 at the KBW Insurance Conference 2026, where the company discussed the USI Insurance Services acquisition and integration plans. Investing.com reported the event and highlighted the planned $6.5 billion revenue platform and $395 million in EBITDA synergies. The U.S. producer price and consumer price data due today can also sway financial stocks like Aon through rate expectations.