Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Case Gregory C
   2. Issuer Name and Ticker or Trading Symbol
Aon plc [AON] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President & CEO
(Last)
(First)
(Middle)
AON CORPORATION - CORPORATE LAW DEPT, 200 EAST RANDOLPH STREET, 8TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
03/09/2015
(Street)

CHICAGO, IL 60601		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Ordinary Shares 03/09/2015   M(1)   50,000 A $ 22.86 1,351,323 D  
Class A Ordinary Shares 03/09/2015   S(1)   29,334 D $ 98.394 (2) 1,321,989 D  
Class A Ordinary Shares 03/10/2015   M(1)   50,000 A $ 22.86 1,371,989 D  
Class A Ordinary Shares 03/10/2015   S(1)   29,244 D $ 96.809 (3) 1,342,745 D  
Class A Ordinary Shares 03/11/2015   M(1)   50,000 A $ 22.86 1,392,745 D  
Class A Ordinary Shares 03/11/2015   S(1)   29,402 D $ 96.065 (4) 1,363,343 D  
Class A Ordinary Shares               176,000 I By Trust

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (Right to Buy) $ 22.86 03/09/2015   M     50,000   (5) 04/04/2015 Class A Ordinary Shares 50,000 (6) 200,000 D  
Employee Stock Option (Right to Buy) $ 22.86 03/10/2015   M     50,000   (5) 04/04/2015 Class A Ordinary Shares 50,000 (6) 150,000 D  
Employess Stock Option (Right to Buy) $ 22.86 03/11/2015   M     50,000   (5) 04/04/2015 Class A Ordinary Shares 50,000 (6) 100,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Case Gregory C
AON CORPORATION - CORPORATE LAW DEPT
200 EAST RANDOLPH STREET, 8TH FLOOR
CHICAGO, IL 60601		   X     President & CEO  

Signatures

 /s/ Matthew M. Rice- Matthew M. Rice pursuant to a power of attorney from Gregory C. Case   03/11/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Transactions reported were effected pursuant to a trading plan meeting the requirements of SEC Rule 10b5-1. The reporting person entered into the trading plan in August 2014 for the sole purpose of exercising options otherwise scheduled to expire in March and April 2015 with the sale of shares intended to be limited to only those necessary to cover exercise price and applicable taxes.
(2) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $98.080 to $98.880, inclusive. The reporting person undertakes to provide to Aon plc, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(3) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $96.500 to $97.290, inclusive. The reporting person undertakes to provide to Aon plc, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(4) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $95.950 to $96.150, inclusive. The reporting person undertakes to provide to Aon plc, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(5) Vesting occurred in accordance with the terms of Aon Stock Incentive Plan as follows: one-third of the options vested on each of the second through fourth anniversaries of the date of grant.
(6) Stock option granted pursuant to Aon Stock Incentive Plan.

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