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 * SINNOTT JOHN T   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 Chair, Office of CEO (Last) (First) (Middle) 1166 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (Month/Day/Year) 03/15/2006 (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 03/15/2006   M   20,000 A $ 20.6354 48,257 D   Common Stock 03/15/2006   S   4,400 D $ 29.98 43,857 D   Common Stock 03/15/2006   S   5,700 D $ 29.99 38,157 D   Common Stock 03/15/2006   S   3,700 D $ 30 34,457 D   Common Stock 03/15/2006   S   3,700 D $ 30.01 30,757 D   Common Stock 03/15/2006   S   2,500 D $ 30.02 28,257 D   Common Stock               398.5 I Stock Investment Plan (401K)

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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

(1)

03/15/2006

A

2,000

(2)

(2)

Common Stock

2,000

$ 0

115,090

D

Stock Options (Right to buy)

$ 20.6354

03/15/2006

M

20,000

(3)

03/19/2007

Common Stock

20,000

$ 0

0

D

Stock Options (Right to buy)

$ 30.215

03/15/2006

A

14,286

(4)

03/14/2016

Common Stock

14,286

$ 0

14,286

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SINNOTT JOHN T 1166 AVENUE OF THE AMERICAS NEW YORK, NY 10036			Vice Chair, Office of CEO

Signatures

Leon J. Lichter, Attorney-in-Fact		03/17/2006
**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).
(4)	These options vest in four equal annual installments on March 15th of 2007, 2008, 2009, and 2010. These options become exercisable only if, after they are vested, the price of MMC common stock is at least 15% higher than the exercise price of the options for ten consecutive trading days.
(1)	The security converts to MMC Common Stock on a 1-for-1 basis
(3)	These options vested in four equal annual installments on March 20th of 1998, 1999, 2000 and 2001.
(2)	Not Applicable

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