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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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) 03/04/2015 (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 03/04/2015   M(1)   50,000 A $ 22.86 1,288,574 D   Class A Ordinary Shares 03/04/2015   S(1)   29,116 D $ 99.283 (2) 1,259,458 D   Class A Ordinary Shares 03/05/2015   M(1)   50,000 A $ 22.86 1,309,458 D   Class A Ordinary Shares 03/05/2015   S(1)   29,082 D $ 99.996 (3) 1,280,376 D   Class A Ordinary Shares 03/06/2015   M(1)   50,000 A $ 22.86 1,330,376 D   Class A Ordinary Shares 03/06/2015   S(1)   22,253 D $ 99.09 (4) 1,308,123 D   Class A Ordinary Shares 03/06/2015   S(1)   6,500 D $ 100.37 (5) 1,301,623 D   Class A Ordinary Shares 03/06/2015   S(1)   300 D $ 100.77 (6) 1,301,323 D   Class A Ordinary Shares               176,000 I By Trust

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

Employee Stock Option (Right to Buy)

$ 22.86

03/04/2015

M

50,000

(7)

04/04/2015

Class A Ordinary Shares

50,000

(8)

350,000

D

Employee Stock Option (Right to Buy)

$ 22.86

03/05/2015

M

50,000

(7)

04/04/2015

Class A Ordinary Shares

50,000

(8)

300,000

D

Employee Stock Option (Right to Buy)

$ 22.86

03/06/2015

M

50,000

(7)

04/04/2015

Class A Ordinary Shares

50,000

(8)

250,000

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 - by Matthew M. Rice pursuant to a power of attorney from Gregory C. Case		03/06/2015
**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 $99.22 to $99.40, 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 $99.71 to $100.15, 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 $98.65 to $99.64, 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)	The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $99.65 to $100.64, 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.
(6)	The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $100.65 to $100.83, 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.
(7)	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.
(8)	Stock option granted pursuant to Aon Stock Incentive Plan.

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