Prospectus Supplement filed under Rule 424(b)(3) Registration No. 333-82368 Prospectus Supplement Dated May 25, 2002 The Prospectus dated May 15, 2002 relating to the offer for resale of up to $701,960,000 aggregate principal amount of The Interpublic Group of Companies, Inc.'s Zero-Coupon Convertible Senior Notes Due 2021, 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 May 16, 2002: Principal Amount of Registered Selling Securityholders Notes ----------------------------------------------------------- ---------------- Amerisure Mutual Insurance Company........................ $300,000 Ramius LP................................................. $100,000 RCG Baldwin LP............................................ $200,000 Total of Above...................................... $600,000