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 * Nadler David A   2. Issuer Name and Ticker or Trading Symbol MARSH & MCLENNAN COMPANIES, INC. [MMC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice Chairman, Office of CEO (Last) (First) (Middle) 1166 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (Month/Day/Year) 02/25/2013 (Street) NEW YORK, NY 10036 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 Common Stock 02/25/2013   M(1)   82,458 A $ 0 185,839.2542 (2) D   Common Stock 02/25/2013   F(1)   46,033 D $ 36.495 139,806.2542 D   Common Stock               7.844 (3) I MMC 401(k) Savings & Investment Plan

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 Units

(4)

02/25/2013

A(5)

54,614

(6)

(6)

Common Stock

54,614

$ 0

82,458

D

Restricted Stock Units

(4)

02/25/2013

M(1)

82,458

(6)

(6)

Common Stock

82,458

$ 0

0

D

Restricted Stk. Units (SSIP)

(4)

(6)

(6)

Common Stock

5,867.174

5,867.174 (7)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Nadler David A 1166 AVENUE OF THE AMERICAS NEW YORK, NY 10036			Vice Chairman, Office of CEO

Signatures

/s/ Lucy Fato, Attorney-in-Fact		02/27/2013
**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)	Vesting and distribution to reporting person of 82,458 shares of restricted stock units of which 46,033 shares were withheld by Marsh & McLennan Companies to cover applicable taxes. These 82,458 shares of restricted stock units relate to 4,588 restricted stock units that were granted on February 22, 2010; 9,534 restricted stock units that were granted on February 21, 2011; 13,722 restricted stock units that were granted on February 24, 2012; 27,170 performance based restricted stock units that were granted on February 21, 2011; and 27,444 performance based restricted stock units that were granted on February 24, 2012.
(2)	Includes dividend reinvestment shares acquired on February 15, 2013.
(3)	Reflects additional shares acquired by the Marsh & McLennan Companies 401(k) Savings & Investment Plan (SIP) Custodian at prevailing market prices. Information reported herein is based on reporting person's Plan Statement as of year end.
(4)	The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis.
(5)	These restricted stock units relate to performance based restricted stock units of 27,170 and 27,444 for the performance periods 2011-2012 and 2012, respectively.
(6)	Not Applicable.
(7)	Reflects additional shares acquired by the Supplemental Savings & Investment Plan (SSIP) Custodian at prevailing market prices. Information reported herein is based on reporting person's Plan Statement as of year end.

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