Sec Form 4 Filing - Nadler David A @ MARSH & MCLENNAN COMPANIES, INC. - 2012-09-25

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 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 (MM/DD/YY) 09/25/2012 (Street) NEW YORK, NY10036 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 09/25/2012 M 3,691 A $ 34.2211 109,995.4722 ( 1 ) D Common Stock 09/25/2012 S 3,691 D $ 34.2211 106,304.4722 D Common Stock 09/25/2012 M 11,071 A $ 34.2211 117,375.4722 D Common Stock 09/25/2012 S 11,071 D $ 34.2211 106,304.4722 D Common Stock 09/25/2012 M 35,000 A $ 34.2211 141,304.4722 D Common Stock 09/25/2012 S 35,000 D $ 34.2211 106,304.4722 D Common Stock 09/25/2012 M 94,697 A $ 34.2211 201,001.4722 D Common Stock 09/25/2012 S 94,697 D $ 34.2211 106,304.4722 D Common Stock 09/25/2012 M 122,550 A $ 34.2211 228,854.4722 D Common Stock 09/25/2012 S 122,550 D $ 34.2211 106,304.4722 D Common Stock 09/25/2012 M 425 A $ 34.2211 106,729.4722 D Common Stock 09/25/2012 S 425 D $ 34.2211 106,304.4722 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Stock Options (Right to Buy) $ 27.86 09/25/2012 M 3,691 03/17/2008 03/16/2014 Common Stock 3,691 $ 0 0 D Stock Options (Right to Buy) $ 27.86 09/25/2012 M 11,071 07/01/2007 03/16/2014 Common Stock 11,071 $ 0 0 D Stock Options (Right to Buy) $ 27.86 09/25/2012 M 35,000 07/01/2007 03/19/2013 Common Stock 35,000 $ 0 0 D Stock Options (Right to Buy) $ 26.07 09/25/2012 M 94,697 ( 2 ) 02/25/2018 Common Stock 94,697 $ 0 0 D Stock Options (Right to Buy) $ 19.045 09/25/2012 M 122,550 ( 3 ) 02/22/2019 Common Stock 122,550 $ 0 40,849 D Stock Options (Right to Buy) $ 22.705 09/25/2012 M 425 ( 4 ) 02/21/2020 Common Stock 425 $ 0 192,874 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Nadler David A 1166 AVENUE OF THE AMERICAS NEW YORK, NY10036 Vice Chairman, Office of CEO Signatures /s/ Lucy Fato, Attorney-in-Fact 09/27/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes dividend reinvestment shares acquired on May 15, 2012 and August 15, 2012. ( 2 )These options were granted on February 26, 2008 and vested in four equal installments on February 26th of 2009, 2010, 2011 and 2012. These options become exercisable only if, after they are vested, the price of Marsh & McLennan Companies common stock is at least 15% higher than the exercise price of the options for ten consecutive trading days. ( 3 )These options were granted on February 23, 2009 and vest in four equal annual installments beginning on the first anniversary of the grant date. The first three installments vested and became exercisable on February 23, 2010, February 23, 2011 and February 23, 2012. The remaining installment vests on February 23, 2013. ( 4 )These options were granted on February 22, 2010 and vest in four equal annual installments beginning on the first anniversary of the grant date. The first two installments vested and became exercisable on February 22, 2011 and February 22, 2012. The second two installments vest on February 22, 2013 and February 22, 2014.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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