Prospectus Supplement filed under Rule 424(b)(3)
                                                      Registration No. 333-84573



                              Prospectus Supplement
                             Dated November 5, 1999


     The Prospectus dated August 13, 1999 relating to the offer for resale of up
to $361,000,000 aggregate principal amount of The Interpublic Group of
Companies, Inc.'s 1.87% Convertible Subordinated Notes due 2006, and such shares
of common stock as may be issued upon conversion of the notes, is hereby
supplemented to include the following information in the "Selling
Securityholders" table in the Prospectus Supplement dated August 13, 1999:


                                                                Principal Amount
                                                                 of Registered
                          Selling Securityholders                    Notes
- -----------------------------------------------------------     ----------------

Credit Suisse First Boston Corporation ....................           $500,000
Warburg Dillon Read LLC ...................................            250,000
- -----------------------------------------------------------           --------
     Total of Above                                                   $750,000
                                                                      ========
     ------------------

     The "Selling Securityholders" table in the Prospectus, as supplemented, is
amended so that the principal amount of registered notes held by Merrill Lynch,
Pierce, Fenner & Smith, Inc. is reduced from $1,085,000 to $300,000.