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


Date of report (Date of earliest event reported)      October 15, 2004                           

                               Marsh & McLennan Companies, Inc.
                      (Exact Name of Registrant as Specified in 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)

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

   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy
the filing obligation of the registrant under any of the following provisions:

|_| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

|_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

|_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act
    (17 CFR 240.14d-2(b))

|_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act
    (17 CFR 240.13e-4(c))

                             Section 7--Regulation FD

Item 7.01.  Regulation FD Disclosure.

         On October 15, 2004, Marsh & McLennan Companies, Inc. issued a press
release announcing that it will hold a conference call for the investment
community on Monday, October 18, 2004 to discuss the charges made by the
New York State Attorney General.  A copy of the press release is attached
to this Report as an exhibit.

                   Section 9--Financial Statements and Exhibits

Item 9.01.  Financial Statements and Exhibits.

            (c)   Exhibits

            99.1  Press release issued October 15, 2004.


      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/ Bart Schwartz
                                             Name:   Bart Schwartz
                                             Title:  Deputy General Counsel
                                                      & Corporate Secretary

Date:   October 15, 2004