SECURITIES AND EXCHANGE COMMISSION
                                          Washington, D.C. 20549

                                           --------------------

                                                 FORM 8-K

                                              CURRENT REPORT

                                 PURSUANT TO SECTION 13 OR 15(d) OF THE
                                     SECURITIES EXCHANGE ACT OF 1934


<TABLE>
<CAPTION>
<S>                                                 <C> <C>
                                             January 28, 2004
---------------------------------------------------------------------------------------------------------
                                    (Date of earliest event reported)



                                     Marsh & McLennan Companies, Inc.
                 ------------------------------------------------------------------------
                          (Exact name of registrant as specified in its charter)




              Delaware                            1-5998                           36-2668272
---------------------------------------------------------------------------------------------------------
  (State or other jurisdiction           (Commission File Number)                (IRS Employer
        of incorporation)                                                      Identification No.)



1166 Avenue of the Americas, New York, NY                                            10036
---------------------------------------------------------------------------------------------------------
(Address of principal executive offices)                                           (Zip Code)



                                               (212) 345-5000
   ---------------------------------------------------------------------------------------------------
                            (Registrant's telephone number, including area code)




</TABLE>

<PAGE>





Item 7.  Financial Statements and Exhibits.

         (a) None.

         (b) None.

         (c) Exhibits

               99.1. Press Release dated January 28, 2004.

Item 12.  Results of Operations and Financial Condition.

     On January 28, 2004, Marsh & McLennan Companies, Inc. issued a press
release announcing its unaudited fourth quarter and year-end financial results
for the quarter and year ended December 31, 2003. A copy of the press release
is attached to this Report as an exhibit and is incorporated herein by
reference.



<PAGE>





                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                               MARSH & McLENNAN COMPANIES, INC.



                                               By:  /s/ Leon J. Lichter
                                                    ----------------------------
                                                    Name:   Leon J. Lichter
                                                    Title:  Vice President &
                                                             Corporate Secretary



Date:  January 29, 2004
       ----------------



<PAGE>





Exhibit Index

Exhibit (99.1):  Press release dated January 28, 2004.
[{"type": "8-K", "sequence": "1", "filename": "f8kjan28-04.txt", "description": "CURRENT REPORT - 01-28-2004", "secsgml_size_bytes": 3357}]
{"company-data": {"conformed-name": "MARSH & MCLENNAN COMPANIES INC", "cik": "0000062709", "assigned-sic": "6411", "irs-number": "362668272", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-05998", "film-number": "04551784"}, "business-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036", "phone": "2123455000"}, "mail-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036"}, "former-company": {"former-conformed-name": "MARLENNAN CORP", "date-changed": "19760505"}}
SECURITIES AND EXCHANGE COMMISSION
                                          Washington, D.C. 20549

                                           --------------------

                                                 FORM 8-K

                                              CURRENT REPORT

                                 PURSUANT TO SECTION 13 OR 15(d) OF THE
                                     SECURITIES EXCHANGE ACT OF 1934
January 28, 2004
---------------------------------------------------------------------------------------------------------
                                    (Date of earliest event reported)

                                     Marsh & McLennan Companies, Inc.
                 ------------------------------------------------------------------------
                          (Exact name of registrant as specified in its charter)

              Delaware                            1-5998                           36-2668272
---------------------------------------------------------------------------------------------------------
  (State or other jurisdiction           (Commission File Number)                (IRS Employer
        of incorporation)                                                      Identification No.)

1166 Avenue of the Americas, New York, NY                                            10036
---------------------------------------------------------------------------------------------------------
(Address of principal executive offices)                                           (Zip Code)

                                               (212) 345-5000
   ---------------------------------------------------------------------------------------------------
                            (Registrant's telephone number, including area code)
Item 7.  Financial Statements and Exhibits.

         (a) None.

         (b) None.

         (c) Exhibits

               99.1. Press Release dated January 28, 2004.

Item 12.  Results of Operations and Financial Condition.

     On January 28, 2004, Marsh & McLennan Companies, Inc. issued a press
release announcing its unaudited fourth quarter and year-end financial results
for the quarter and year ended December 31, 2003. A copy of the press release
is attached to this Report as an exhibit and is incorporated herein by
reference.
SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                               MARSH & McLENNAN COMPANIES, INC.

                                               By:  /s/ Leon J. Lichter
                                                    ----------------------------
                                                    Name:   Leon J. Lichter
                                                    Title:  Vice President &
                                                             Corporate Secretary

Date:  January 29, 2004
       ----------------
Exhibit Index

Exhibit (99.1):  Press release dated January 28, 2004.