Davis Polk advised the underwriters in connection with an SEC-registered offering by Aon Corporation of $350 million aggregate principal amount of 4.500% senior notes due 2028. The notes are fully and unconditionally guaranteed by Aon plc.

Aon Corporation, incorporated under the laws of Delaware, is an indirect, wholly owned subsidiary of Aon plc. Headquartered in London, England, Aon plc is a leading global professional services firm that provides advice and solutions focused on risk, retirement and health, delivering distinctive client value via innovative and effective risk management and workforce productivity solutions that are under-pinned by industry-leading data and analytics.

The Davis Polk corporate team included partner John G. Crowley and associate Yoojin L. Kim. The tax team included partners Mario J. Verdolini and Jonathan Cooklin and associates Dominic Foulkes and Rosie Upstill. Members of the Davis Polk team are based in the New York and London offices.