PROSPECTUS SUPPLEMENT (To Prospectus Dated June 3, 2002) Filed Pursuant to Rule 424(b)(3) Registration Statement No. 333-86194 $900,000,000 OMNICOM GROUP INC. Zero Coupon Zero Yield Convertible Notes due 2032 This prospectus supplement relates to the resale by the selling securityholders of Zero Coupon Zero Yield Convertible Notes due 2032 of Omnicom Group Inc. and the shares of common stock issuable upon the conversion and/or redemption of the notes. This prospectus supplement should be read in conjunction with the prospectus dated June 3, 2002, which is to be delivered with this prospectus supplement. All capitalized terms used but not defined in the prospectus supplement shall have the meanings given to them in the prospectus. The following information replaces in its entirety the information provided in the prospectus under the caption "Selling Securityholders." SELLING SECURITYHOLDERS The notes were originally issued by us and sold to J.P. Morgan Securities Inc., Goldman Sachs & Co. and Salomon Smith Barney Inc., to whom we refer elsewhere as the "initial purchasers," in a transaction exempt from the registration requirements of the federal securities laws. The initial purchasers resold the notes to persons reasonably believed by them to be "qualified institutional buyers" as defined by Rule 144A under the Securities Act. The selling securityholders, which term includes their transferees, pledgees, donees or successors, may from time to time offer and sell pursuant to this prospectus, as amended or supplemented, any and all of the notes and the shares of common stock issuable upon conversion and/or redemption of the notes. Set forth below are the names of each selling securityholder, the principal amount of notes that may be offered by such selling securityholder pursuant to this prospectus, as amended or supplemented, and the number of shares of common stock into which such notes are convertible, each to the extent known to us as of the date of this prospectus. Unless set forth below, none of the selling securityholders has had a material relationship with us or any of our predecessors or affiliates within the past three years. The following table sets forth certain information received by us on or prior to June 13, 2002. However, any or all of the notes or common stock listed below may be offered for sale pursuant to this prospectus, as amended or supplemented, by the selling securityholders from time to time. Accordingly, no estimate can be given as to the amounts of notes or common stock that will be held by the selling securityholders upon consummation of any such sales. In addition, the selling securityholders identified below may have sold, transferred or otherwise disposed of all or a portion of their notes since the date on which the information regarding their notes was provided, in transactions exempt from the registration requirements of the Securities Act. Aggregate Principal Amount of Notes at Percentage of Common Stock Common Stock Maturity that Notes Owned Prior Registered Name may be Sold Outstanding to Conversion Hereby(1) ------------------------------------------------- ------------- ------------ ------------- ------------- AIG DKR SoundShore Holdings Ltd. ................ $ 9,200,000 1.0% -- 83,628 AIG DKR SoundShore Opportunity Holding Fund Ltd. .................................... 6,120,000 * -- 55,630 AIG DKR SoundShore Strategic Holding Fund Ltd. .................................... 4,680,000 * -- 42,541 Alpha U.S. Sub Fund VIII, LLC ................... 2,000,000 * -- 18,180 Alta Partners Holdings, LDC ..................... 30,000,000 3.3% -- 272,700 American Pioneer Life Insurance Company of New York ..................................... 80,000 * -- 727 American Progressive Life and Health Insurance Company of New York .......................... 80,000 * -- 727 American Public Entity Excess Pool .............. 80,000 * -- 727 Amerisure Mutual Insurance Company .............. 400,000 * -- 3,636 Argent Classic Convertible Arbitrage Fund L.P. .. 2,925,000 * -- 26,588 Argent Classic Convertible Arbitrage Fund (Bermuda) Ltd. .......................... 5,000,000 * -- 45,450 Argent LowLev Convertible Arbitrage Fund LLC .... 500,000 * -- 4,545 Argent LowLev Convertible Arbitrage Fund Ltd. ... 7,580,000 * -- 68,902 Aristeia International Limited .................. 28,875,000 3.2% -- 262,473 Aristeia Trading LLC ............................ 8,625,000 * -- 78,401 B.G.I. Global Investors c/o Forest Investment Mngt L.L.C. .................................. 167,000 * -- 1,518 BMO Nesbitt Burns Inc. .......................... 8,000,000 * -- 72,720 CDC IXIS Paris .................................. 10,000,000 1.1% 400 90,900 Celina Mutual Insurance Company ................. 20,000 * -- 181 Central States Health and Life Company of Omaha ........................................ 210,000 * -- 1,908 Credit Suisse First Boston Europe Ltd. .......... 19,400,000 2.2% -- 176,346 CSA Fraternal Life Insurance Company ............ 120,000 * -- 1,090 Dakota Truck Underwriters ....................... 20,000 * -- 181 Deephaven Domestic Convertible Trading Ltd. ..... 78,000,000 8.7% -- 709,020 Deutsche Bank Securities Inc. ................... 15,600,000 1.7% -- 141,804 Forest Alternative Strategies, II ............... 133,000 * -- 1,208 Forest Fulerum Fund L.L.P. ...................... 2,667,000 * -- 24,243 Forest Global Convertible Fund Series A-5 ....... 1,700,000 * -- 15,453 Gaia Offshore Master Fund Ltd. .................. 11,700,000 1.3% -- 106,353 Global Bermuda Limited Partnership .............. 14,000,000 1.6% -- 127,260 HBK Master Fund L.P. ............................ 5,000,000 * -- 45,450 Innovest Finanzdienstleistungs AG ............... 545,000 * -- 4,954 JMG Convertible Investments, LP ................. 10,000,000 1.1% -- 90,900 JMG Triton Offshore Fund, Ltd. .................. 20,000,000 2.2% -- 181,800 JP Morgan Securities Inc. ....................... 58,540,000 6.5% -- 532,128 KBC Financial Products USA Inc. ................. 5,750,000 * -- 52,267 Lakeshore International, Ltd. ................... 56,000,000 6.2% -- 509,040 Lincoln Heritage Life Insurance Company ......... 40,000 * -- 363 LLT Limited ..................................... 600,000 * -- 5,454 Lyxor Master Fund c/o Forest Investment Mngt L.L.C. .................................. 9,333,000 1.0% -- 84,836 Lyxor Master Fund ............................... 1,800,000 * -- 16,362 Lyxor Master Fund Ref: Argent/LowLev CB ......... 1,000,000 * -- 9,090 Main Street America Assurance Company ........... 400,000 * -- 3,636 Marquette Indemnity and Life Insurance Company ...................................... 80,000 * -- 727 Merrill Lynch International Limited(2) .......... 40,000,000 4.4% -- 363,600 Michigan Mutual Insurance Co. ................... 900,000 * -- 8,181 Michigan Professional Insurance Exchange ........ 60,000 * -- 545 Midwest Security Life ........................... 240,000 * -- 2,181 MLQA Convertible Securities Arbitrage, Ltd. ..... 5,000,000 * -- 45,450 Morgan Stanley & Co. ............................ 70,000,000 7.8% -- 636,300 Mutual Protective Insurance Company ............. 900,000 * -- 8,181 National Mutual Insurance Company ............... 30,000 * -- 272 NCMIC ........................................... 470,000 * -- 4,272 New Era Life Insurance Company .................. 50,000 * -- 454 Nicholas Applegate Investment Grade Convertible . 15,000 * -- 136 Oak Casualty Insurance Company .................. 40,000 * -- 363 Onyx Fund Holdings, LDC ......................... 18,000,000 2.0% -- 163,620 Oklahoma Attorneys Mutual Insurance Company ..... 10,000 * -- 90 Phico Insurance Company ......................... 550,000 * -- 4,999 Physicians Mutual Insurance Company ............. 550,000 * -- 4,999 Physicians Life Insurance Company ............... 250,000 * -- 2,272 Pioneer Insurance Company ....................... 80,000 * -- 727 Premera Blue Cross .............................. 1,150,000 * -- 10,453 R(2) Investments, LDC ........................... 55,000,000 6.1% -- 499,950 RBC Capital Services Inc. c/o Forest Investment Mngt L.L.C. .................................. 133,000 * -- 1,208 Relay 11 Holdings c/o Forest Investment Mngt L.L.C. ................................. 3,000,000 * -- 27,270 Salomon Smith Barney Inc. ....................... 27,645,000 3.1% -- 251,293 Scor Life RE Convertible ........................ 120,000 * -- 1,090 Sylvan (IMA) Ltd. c/o Forest Investment Mngt L.L.C. .................................. 2,000,000 * -- 18,180 Standard Mutual Insurance Company ............... 220,000 * -- 1,999 State National Insurance Company ................ 90,000 * -- 818 Texas Hospital Insurance Exchange ............... 20,000 * -- 181 Transguard Insurance Company of America, Inc. ... 750,000 * -- 6,817 Tribeca Investments L.L.C. ...................... 18,000,000 2.0% -- 163,620 Tuscarora Wayne Mutual Insurance Company ........ 20,000 * -- 181 UBS O'Connor LLC F/B/O UBS Global Equity Arbitrage Master Ltd. ........................ 26,750,000 3.0% -- 243,157 UBS O'Connor LLC F/B/O O'Connor Global Convertible Portfolio ........................ 1,750,000 * -- 15,907 United National Insurance Company ............... 200,000 * -- 1,818 VESTA-WEX Insurance Exchange IASA ............... 150,000 * -- 1,363 Western Home Insurance Company .................. 170,000 * -- 1,545 Westward Life Insurance Company ................. 150,000 * -- 1,363 West Virginia Fire Insurance Company ............ 10,000 * -- 90 Wisconsin Lawyers Mutual Insurance Company ...... 190,000 * -- 1,727 Wisconsin Mutual Insurance Company .............. 100,000 * -- 909 World Insurance Company ......................... 400,000 * -- 3,636 Zurich Master Hedge Fund c/o Forest Investment Mngt L.L.C. ....................... 267,000 * -- 2,427 Zurich Institutional Benchmark Master Fund Ltd. . 500,000 * -- 4,545 All other holders of notes or future transferees, pledges, donees or successors of any such holders(2)(3) ................................ 187,100,000 20.8% -- 1,700,739 ------------ ------ ---- --------- Total(4) ..................................... $900,000,000 100.00% 400 8,181,000 ============ ====== ==== ========= * Less than 1% ---------- (1) Assumes conversion of all of the holder's notes at a conversion rate of 9.09 shares of common stock per $1,000 principal amount at maturity of the notes. However, this conversion rate will be subject to adjustment as described under "Description of the Notes -- Conversion Rights." As a result, the amount of common stock issuable upon conversion of the notes may increase or decrease in the future. (2) Merrill Lynch, Pierce Fenner & Smith Incorporated has advised us that it is not aware of any position, office or directorship relationship with Omnicom or its affiliates. However, Merrill Lynch has advised us that it may have from time to time acted in a financial investment advisory capacity to Omnicom. (3) Information about other selling securityholders will be set forth in prospectus supplements, if required. (4) Assumes that any other holders of notes, or any future transferees, pledgees, donees or successors of or from any such other holders of notes, do not beneficially own any common stock other than the common stock issuable upon conversion of the notes at the initial conversion rate. (5) Amounts may not sum due to rounding. The preceding table has been prepared based upon information furnished to us by the selling securityholders named in the table. From time to time, additional information concerning ownership of the notes and common stock may be known by certain holders thereof not named in the preceding table, with whom we believe we have no affiliation. Information about the selling securityholders may change over time. Any changed information will be set forth in future prospectus supplements. ---------- The date of this Prospectus Supplement is June 14, 2002.