Aon plc — Regulatory Filings 2014

Feb 18, 2014

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plc

Aon plc
200 East Randolph Street
Chicago, IL 60601

February 18, 2014

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

RE: Notice of disclosure filed in Exchange Act Annual Report under Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Exchange Act

Ladies and Gentlemen:

Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Securities Exchange Act of 1934, as amended, notice is hereby provided that Aon plc has made disclosure pursuant to those provisions in its Annual Report on Form 10-K for the year ended December 31, 2013, which was filed with the U.S. Securities and Exchange Commission on February 18, 2014.

Respectfully submitted,

Aon plc

/s/ CARL BLEECHER

Carl Bleecher

Senior Vice President and Chief Audit Executive

Aon plc — Registered office:
Registered in England and Wales, No. 7876075