Prospectus Supplement filed under Rule 424(b)(3) Registration No. 333-65905 Prospectus Supplement The Prospectus dated November 16, 1998, relating to the offering of 792,735 shares of Common Stock of The Interpublic Group of Companies, Inc., a form of which was filed with the Securities and Exchange Commission on November 16, 1998, is hereby supplemented to amend and include the following information in the "Selling Stockholders" table: Number of Shares to Number of be Beneficially Owned Shares Maximum after Offering, Beneficially Number of Assuming All Shares Name of Selling Owned Prior to Shares to be Offered are Stockholder the Offering Offered Distributed - --------------- -------------- ------------ --------------------- Rolf H. Towe....... 82,077(1) 27,500 42,077 The Towe Family 0(1) 12,500 0 Foundation, Inc. .. - --------------- (1) Subsequent to the commencement of the Offering, Rolf. H. Towe donated 12,500 of the 82,077 shares held by him prior to the Offering to The Towe Family Foundation, Inc. This Prospectus Supplement is dated November 25, 1998