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 * WIJNBERG SANDRA S   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) Sr. Vice President, CFO (Last) (First) (Middle) 1166 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (Month/Day/Year) 03/31/2006 (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 03/31/2006   M   8,248 (1) A $ 0 130,727.0212 (2) D   Common Stock 03/31/2006   D   43,072 (3) D $ 0 87,655.0212 (2) D   Common Stock 03/31/2006   F   28,106 (4) D $ 29.185 59,549.0212 (2) D   Common Stock - SIP               1,463.03 (5) I Stock Investment Plan (401K)

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 Stk. Units -SISP

(6)

12/31/2005

J(7)

V

79.1561

(8)

(8)

Common Stock

79.1561

$ 0

4,439.032

D

Restricted Stock Units

(6)

03/31/2006

M

8,248

(8)

(8)

Common Stock

8,248

(8)

2,800 (1)

D

Restricted Stock Units - Bonus Deferral Plan

(6)

02/15/2006

J(9)

V

147.326

(8)

(8)

Common Stock

147.326

$ 29.47

25,686.947

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
WIJNBERG SANDRA S 1166 AVENUE OF THE AMERICAS NEW YORK, NY 10036			Sr. Vice President, CFO

Signatures

Leon J. Lichter, Attorney-in-Fact		04/04/2006
**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)	Shares withheld to cover applicable taxes upon (i) vesting of shares of previously-reported restricted stock and (ii) distribution of MMC Common Stock acquired in connection with the vesting and conversion of restricted stock units.
(5)	Reflects account balance of reporting person as of December 31, 2005.
(2)	Includes 3.0636 shares acquired pursuant to the MMC Dividend Reinvestment Plan.
(1)	Reflects the vesting and conversion of 8,248 restricted stock units to shares of MMC Common Stock in connection with termination of employment (1,872 restricted stock units were forfeited). Shares were distributed net of tax withholding.
(6)	The security converts to MMC Common Stock on a 1-for-1 basis.
(3)	Shares of restricted stock forfeited upon termination of employment.
(7)	Shares acquired by the Stock Investment Supplemental Plan (SISP) Custodian at prevailing market prices. Information reported herein is based on reporting person's Plan Statement as of December 31, 2005.
(9)	Dividend proceeds credited to the reporting person's account at prevailing market prices.
(8)	Not Applicable

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