SCHEDULE 14A
(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION
PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO.     )

Filed by the registrant  ☒                         Filed by a Party other than the registrant  ☐
Check the appropriate box:

☐	 	Preliminary proxy statement	
☐	 	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))	
☐	 	Definitive proxy statement	
☒	 	Definitive additional materials	
☐	 	Soliciting material pursuant to Rule 14a-12	
Aon plc
(Name of Registrant as Specified in Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of filing fee (Check the appropriate box):

☒	 	No fee required.	
		
☐	 	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.	
			
	 	(1)	 	Title of each class of securities to which transaction applies:

	 	(2)	 	Aggregate number of securities to which transaction applies:

	 	(3)	 	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

	 	(4)	 	Proposed maximum aggregate value of transaction:

	 	(5)	 	Total fee paid:

☐	 	Fee paid previously with preliminary materials.	
		
☐	 	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.	
			
	 	(1)	 	Amount previously paid:

	 	(2)	 	Form, schedule or registration statement no.:

	 	(3)	 	Filing party:

	 	(4)	 	Date filed:

 

					
	  	     	
	  		  	Vote by Internet
 
•  Go to www.envisionreports.com/AON
•  Or scan the QR code with your smartphone
•  Follow the steps outlined on the secure website	

Important Notice Regarding the Availability of Proxy Materials for the
Aon plc Annual General Meeting To Be Held on June 22, 2018
Under the rules of the Securities and Exchange Commission and the U.K. Companies Act 2006, you are receiving this notice that the proxy materials for Aon plc’s annual general meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a paper copy of the proxy materials. The items to be voted on and location of the annual general meeting are on the reverse side.
This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. It is not a substitute for them. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Proxy Statement, Annual Report to Shareholders, and U.K. Annual Report and Accounts for the year ended December 31, 2017 are available at:

 
							
	    	Easy Online Access — A Convenient Way to View Proxy Materials and Vote	
	    	When you go online to view proxy materials, you can also vote your shares.	
	    	Step 1:	  	Go to www.envisionreports.com/AON to view the materials.	
	    	Step 2:	  	Click on Cast Your Vote or Request Materials.	
	    	Step 3:	  	Follow the instructions on the screen to log in.	
	    	Step 4:	  	Make your selection as instructed on each screen to select delivery preferences and vote.	
When you go online, you can also help the environment by consenting to receive electronic delivery of future materials.

 
	    	Obtaining a Copy of the Proxy Materials – If you want to receive a paper or e-mail copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before June 12, 2018 to facilitate timely delivery.	

                             Q2TYQA

Information about the Annual General Meeting
The Annual General Meeting of Aon plc will be held at 8 Northumberland Avenue, London, WC2N 5BY, United Kingdom, on June 22, 2018 at 8:00 A.M. British Summer Time.
Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations
The Board of Directors recommends a vote FOR each of the nominees listed in Proposal 1 below, each to be re-elected or elected by way of a separate resolution, and FOR Proposals 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, each to be passed as a separate resolution.
 
 	1.	Re-election of Directors.	
01 - Lester B. Knight
02 - Gregory C. Case
03 - Jin-Yong Cai
04 - Jeffrey C. Campbell
05 - Fulvio Conti
06 - Cheryl A. Francis
07 - J. Michael Losh
08 - Richard B. Myers
09 - Richard C. Notebaert
10 - Gloria Santona
11 - Carolyn Y. Woo
 
 	2.	Advisory vote to approve executive compensation.	
 
 	3.	Advisory vote to approve the directors’ remuneration report.	
 
 	4.	Receipt of Aon’s annual report and accounts, together with the reports of the directors and auditors, for the year ended December 31, 2017.	
 
 	5.	Ratification of the appointment of Ernst & Young LLP as Aon’s Independent Registered Public Accounting Firm.	
 
 	6.	Re-appointment of Ernst & Young LLP as Aon’s U.K. statutory auditor under the Companies Act of 2006.	
 
 	7.	Authorization of the Board of Directors to determine the remuneration of Aon’s U.K. statutory auditor.	
 
 	8.	Approval of forms of share repurchase contracts and repurchase counterparties.	
 
 	9.	Authorize the Board of Directors to exercise all powers of Aon to allot shares.	
 
 	10.	Authorize the Board of Directors to allot equity securities for cash without rights of preemption.	
 
 	11.	Authorize Aon and its subsidiaries to make political donations or expenditures.	
 
 	12.	In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting or any adjournment or postponement thereof.	
PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS DOCUMENT. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. This is not the official notice of the Annual General Meeting for the purposes of English law. The official notice is contained in the proxy materials.
Directions to the Annual General Meeting of Aon plc
For directions to the Annual General Meeting of Aon plc, please contact Aon’s corporate office at + 1 (312) 381-1000 in the United States or + 44(0) 20 7623 5500 in the United Kingdom.

 
	 	 
Here’s how to order a copy of the proxy materials, which include the proxy card, Proxy Statement, Annual Report to Shareholders, and U.K. Annual Report and Accounts, and select a future delivery preference:
 
Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below.
 
Email copies: Current and future email delivery requests must be submitted via the Internet in accordance with the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials.
 
PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials.	
	 	 
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Internet – Go to www.envisionreports.com/AON. Click Cast Your Vote or Request Materials. Follow the instructions to log in and order a paper or email copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials.	
	 	 
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Telephone – Call us free of charge at 1-866-641-4276 using a touch-tone phone and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings.	
	 	 
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Email – Send an email to investorvote@computershare.com with “Proxy Materials Aon plc” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings.	
	 		 	 
To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by June 12, 2018.	
	 	 
Q2TYQA