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 Securityholders" table in the Prospectus Supplement dated February 25, 1998: Principal Amount Selling Holders of Registered --------------- ------------- Notes ----- Arkansas PERS.................................... $1,600,000 FSA Inc.......................................... 730,000 ICI American Holdings Trust...................... 540,000 Merrill Lynch Insurance Group.................... 350,000 Nalco Chemical Corp. Retirement.................. 255,000 Occidental Petroleum............................. 50,000 PRIM Board....................................... 2,950,000 Starvest Fund-Investment Grade................... 750,000 State of Delaware PERS........................... 1,350,000 State of Oregon/SAIF Corporation................. 5,000,000 Southern Farm Bureau Life Insurance-FRIC......... 720,000 Valley Insurance................................. 145,000 Zeneca Holdings Trust............................ 540,000 -------- Total............................................ $14,980,000 This Prospectus Supplement is dated March 27, 1998.