Aon plc Senior Notes Offering

On September 14, 2026, Aon North America, Inc., Aon Global Holdings plc, Aon plc, Aon Corporation, and Aon Global Limited entered into an underwriting agreement for the offering and sale of $2,000,000,000 aggregate principal amount of 5.350% Senior Notes due 2029, $3,000,000,000 of 5.625% Senior Notes due 2031, $2,000,000,000 of 5.800% Senior Notes due 2033, $2,750,000,000 of 5.950% Senior Notes due 2036, $1,000,000,000 of 6.100% Senior Notes due 2038, $750,000,000 of 6.450% Senior Notes due 2046, and $2,000,000,000 of 6.450% Senior Notes due 2056. These notes are senior unsecured debt obligations, fully and unconditionally guaranteed on a senior unsecured basis by Aon plc, Aon Corporation, and Aon Global Limited. The net proceeds, approximately $13.4 billion, are intended for general corporate purposes, including the acquisition of USI Advantage Corp., repayment of USI's indebtedness, and associated fees and expenses. The notes are subject to redemption under specific conditions, including a par call option and a mandatory redemption under certain circumstances related to the USI acquisition. The offering is conducted under a shelf registration statement and governed by an indenture.