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 *
McGill Stephen P
  2. Issuer Name and Ticker or Trading Symbol
Aon plc [AON]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chairman/CEO - ARS
(Last)
(First)
(Middle)
C/O AON PLC, 8 DEVONSHIRE SQUARE
3. Date of Earliest Transaction (Month/Day/Year)
02/16/2013
(Street)

LONDON, X0 EC2M 4PL
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 02/16/2013   M(1)   4,171 A (1) 170,701 D  
Class A Ordinary Shares 02/16/2013   F(2)   1,958 D $ 57 168,743 D  
Class A Ordinary Shares 02/17/2013   M(1)   4,382 A (1) 173,125 D  
Class A Ordinary Shares 02/17/2013   F(2)   2,057 D $ 57 171,068 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
Restricted Stock Unit (Right to Receive) (3) 02/16/2013   M     4,171 02/16/2013(4) 02/16/2015 Class A Ordinary Shares 4,171 $ 0 8,340 D  
Restricted Stock Unit (Right to Receive) (3) 02/17/2013   M     4,382 02/17/2011(4) 02/17/2014 Class A Ordinary Shares 4,382 $ 0 4,381 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
McGill Stephen P
C/O AON PLC
8 DEVONSHIRE SQUARE
LONDON, X0 EC2M 4PL
      Chairman/CEO - ARS  

Signatures

 /s/ Matthew M. Rice - by Matthew M. Rice pursuant to a power of attorney from Stephen P. McGill   02/20/2013
**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) Class A Ordinary Shares acquired upon the vesting of a restricted stock unit award.
(2) Class A Ordinary Shares withheld by the issuer for the payment of withholding taxes in connection with the vesting of a restricted stock unit award.
(3) The restricted stock unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with U.K. law, the reporting person agreed to pay the issuer the nominal value of US$0.01 per share issued to the reporting person.
(4) The restricted stock unit award will vest in accordance with the terms of the Aon Stock Incentive Plan as follows: 33 1/3% of the awards will vest on each of the first through third anniversaries of the date of grant.

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