Prospectus Supplement filed under Rule 424(b)(3) Registration No. 333-45569 Prospectus Supplement The Prospectus dated February 4, 1998 relating to the offer for resale of up to $250,000,000 aggregate principal amount of The Interpublic Group of Companies, Inc.'s 1.80% Convertible Subordinated Notes due September 16, 2004 is hereby supplemented to include the following information in the "Selling Security- holders" table in the Prospectus Supplement dated February 25, 1998: Principal Amount of Registered Selling Holders Notes - ----------------------------------------------- ---------------- Donaldson, Lufkin & Jenrette Securities Corp... $ 20,000 Franklin Asset Allocation Fund................. 1,000,000 Julius Baer Securities......................... 800,000 The Travelers Indemnity Company................ 2,917,000 The Travelers Insurance Company................ 1,875,000 The Travelers Insurance Company Separate Account TLAC................................. 208,000 - ----------------------------------------------- ---------------- Total of Above................................. $6,820,000 ================ The "Selling Securityholder" table in the Prospectus, as supplemented, is amended so that the principal amount of registered Notes held by Goldman, Sachs & Co. is decreased from $1,019,000 to $269,000. This Prospectus Supplement is dated October 9, 1998.