OMNICOM GROUP INC
S-3, 1998-01-16
ADVERTISING AGENCIES
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    As filed with the Securities and Exchange Commission on January 16, 1998

                                                      Registration No. 333-_____

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   
                                   ----------

                                    FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                   ----------

                               OMNICOM GROUP INC.
             (Exact name of registrant as specified in its charter)

         New York                                         13-1514814
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
incorporation or organization)

                               437 Madison Avenue
                            New York, New York 10022
                                 (212) 415-3600
               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)

                              BARRY J. WAGNER, ESQ.
                                    Secretary
                               Omnicom Group Inc.
                               437 Madison Avenue
                            New York, New York l0022
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

            Please send copies of all communications and notices to:
                            MICHAEL D. DITZIAN, ESQ.
                                 Davis & Gilbert
                                  1740 Broadway
                            New York, New York 10019
                                 (212) 468-4800

Approximate  date of commencement of proposed sale to public:  From time to time
after the effective date of the Registration Statement.

If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box: [ ]

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box: [X]

If this form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  Registration  Statement  number of the  earlier  effective
Registration Statement for the same offering: [ ]

If this form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the Securities  Act,  please check the following box and list the Securities Act
Registration  Statement number of the earlier effective  Registration  Statement
for the same offering: [ ]

If delivery  of the  Prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box: [ ]

                         CALCULATION OF REGISTRATION FEE
================================================================================
  Title of     Amount to be     Proposed maximum   Proposed maximum   Amount of
securities to   registered (1)   offering price       aggregate     registration
be registered                     per share (2)       offering           fee
                                                      price (2)             
- --------------------------------------------------------------------------------
Common Stock,
$.50 par value  807,746 shs.         $37.9063        $30,618,662.20     $9,033
================================================================================

(1)  Plus such additional  indeterminate number of shares as may become issuable
     upon exchange of the Exchangeable Shares of GPC International Holdings Inc.
     as a  result  of the  antidilution  provisions  contained  in  the  charter
     documents  of  GPC  International   Holdings  Inc.  with  respect  to  such
     Exchangeable Shares.

(2)  Estimated  solely for the  purposes of  calculating  the  registration  fee
     pursuant to Rule 457(c),  based upon the average of the high and low prices
     of the Common Stock of Omnicom on January 12, 1998,  as reported by the New
     York Stock Exchange.

THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT  SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION  STATEMENT
SHALL  THEREAFTER  BECOME  EFFECTIVE  IN  ACCORDANCE  WITH  SECTION  8(a) OF THE
SECURITIES  ACT OF  1933 OR  UNTIL  THIS  REGISTRATION  STATEMENT  SHALL  BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

================================================================================

<PAGE>

Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of any offer to buy nor shall there be any sale of these securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.

                  SUBJECT TO COMPLETION, DATED JANUARY 16, 1998

PROSPECTUS

                         807,746 Shares of Common Stock
                                ($.50 Par Value)

                               OMNICOM GROUP INC.

                                -----------------

     This  Prospectus  relates to 807,746  shares (the  "Shares")  of the common
stock,  par value $.50 per share (the "Common  Stock") of Omnicom  Group Inc., a
New York  corporation  (the  "Company").  The Shares  that are being  registered
hereby are to be offered for the account of the holders  thereof  (the  "Selling
Shareholders").  Each share of Common  Stock  offered  hereby is  issuable  upon
exchange of an Exchangeable Share (an "Exchangeable Share") of GPC International
Holdings  Inc.  ("GPC"),  a corporation  incorporated  under the laws of Canada,
issued in a private  offering in Canada by GPC for GPC Class A Common  Shares in
connection with the  combination of GPC and the Company.  The Common Stock to be
acquired  upon exchange of the  Exchangeable  Shares will be issued from time to
time in private offerings in Canada. See "Description of Exchangeable Shares."

     The Shares are being registered to permit public  secondary  trading of the
Shares  by the  holders  thereof  from  time  to  time  after  the  date of this
Prospectus.  The Company has agreed  among other  things,  to bear all  expenses
(other than  underwriting  discounts  and  commissions  and fees and expenses of
counsel and other advisors to the holders of the Shares) in connection  with the
registration  and  sale of the  Shares  covered  by this  Prospectus;  provided,
however,  the  Company  has not  agreed to  provide,  or incur any  expenses  in
connection with, accountants' "cold comfort" letters, opinions of counsel, or to
enter  into  underwriting   agreements,   such  as  would  be  customary  in  an
underwritten offering.

     The Company  will not receive any of the  proceeds  from sales of Shares by
the Selling Shareholders.  The Shares may be offered in negotiated  transactions
or otherwise at market  prices  prevailing  at the time of sale or at negotiated
prices. See "Plan of Distribution". The Selling Shareholders may be deemed to be
underwriters  within the meaning of the  Securities Act of 1933, as amended (the
"Securities Act"). If any broker-dealers purchase any Shares as principals,  any
profits  received  by such  broker-dealers  on the  resale of the  Shares may be
deemed to be underwriting  discounts or commissions under the Securities Act. In
addition,  any profits realized by the Selling  Shareholders may be deemed to be
underwriting commissions.

     The Company's  Common Stock is traded on the New York Stock  Exchange under
the symbol OMC.  On January  12,  1998,  the last  reported  sale price for such
shares, as reported by the New York Stock Exchange, was $37.875 per share.

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                  ------------

            The Date of this Prospectus is ____________________,1998.

<PAGE>

                                TABLE OF CONTENTS

Available Information..........................................................3
Incorporation of Certain Documents by Reference................................4
The Company....................................................................5
Use of Proceeds................................................................5
Description of Capital Stock...................................................6
Description of Exchangeable Shares.............................................7
Selling Shareholders..........................................................10
Plan of Distribution..........................................................10
Experts.......................................................................12
Legal Matters.................................................................12


                                       2
<PAGE>

NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY  REPRESENTATIONS,
OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS  PROSPECTUS,  IN
CONNECTION WITH THE OFFERING  CONTEMPLATED  HEREBY,  AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR THE SELLING  SHAREHOLDER.  THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY SECURITIES  OTHER THAN
THE  REGISTERED  SECURITIES  TO  WHICH  IT  RELATES.  THIS  PROSPECTUS  DOES NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION  OF AN OFFER TO BUY ANY SECURITIES
IN ANY  JURISDICTION  TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR
SOLICITATION IN SUCH  JURISDICTION.  NEITHER THE DELIVERY OF THIS PROSPECTUS NOR
ANY SALE MADE HEREUNDER SHALL, UNDER ANY  CIRCUMSTANCES,  CREATE ANY IMPLICATION
THAT  THERE HAS BEEN NO  CHANGE IN THE  AFFAIRS  OF THE  COMPANY  SINCE THE DATE
HEREOF OR THAT THE INFORMATION  CONTAINED OR INCORPORATED BY REFERENCE HEREIN IS
CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.

                              AVAILABLE INFORMATION

     The Company has filed with the  Securities  and  Exchange  Commission  (the
"Commission")  a Registration  Statement on Form S-3 under the Securities Act of
1933, as amended (the  "Securities  Act"),  which relates to the Shares  offered
hereby (the "Registration  Statement").  This Prospectus does not contain all of
the  information  contained in the  Registration  Statement and the exhibits and
schedules  thereto,  and reference is hereby made to the Registration  Statement
and to exhibits thereto for further  information with respect to the Company and
the  Shares  offered  hereby.  Any  statements   contained  in  this  Prospectus
concerning  the contents of any contract or other  document are not  necessarily
complete, and, in each instance,  reference is made to the copy of such document
filed as an exhibit to the  Registration  Statement or otherwise  filed with the
Commission. Each such statement is qualified in its entirety by such reference.

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith  files  reports,  proxy  statements  and  other  information  with the
Commission. Copies of such reports, proxy statements, the Registration Statement
and exhibits  thereto and other  information may be inspected  without charge at
the offices of the  Commission  at  Judiciary  Plaza,  450 Fifth  Street,  N.W.,
Washington,  D.C. 20549, and at the  Commission's  Regional Offices located at 7
World Trade Center,  13th floor,  New York, New York 10048; and Citicorp Center,
500


                                       3
<PAGE>

West Madison Street,  Suite 1400,  Chicago,  Illinois 60661,  and copies of such
material may be obtained from the Pubic  Reference  Section of the Commission at
its Washington, D.C. or regional offices upon the payment of the fees prescribed
by the  Commission.  The  Commission  maintains  a World  Wide  Web  site on the
Internet  at   http://www.sec.gov   that  contains  reports,   proxy  and  other
information  regarding registrants that file electronically with the Commission,
including  the  Company.  In  addition,  reports,  proxy  statements  and  other
information concerning the Company may be inspected and copied at the offices of
the New York Stock Exchange, Inc., 20 Broad Street, New York, New York 10005.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The  documents  listed  below  have  been  filed  by the  Company  with the
Commission and are incorporated herein by reference:

          (a) The Company's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1996,

          (b) The  Company's  unaudited  Quarterly  Reports on Form 10-Q for the
     quarters ended March 31, 1997, June 30, 1997 and September 30, 1997,

          (c) The  Company's  Report  on Form  8-K  dated  January  3,  1997 and
     relating to the issuance of certain of its 4 1/4% Convertible  Subordinated
     Debentures  due 2007  pursuant to the  exemption  provided by Regulation S,
     Rule 144A and Rule 501(A)(1), (2), (3) or (7) under the Securities Act, and

          (d) The Company's  definitive  Proxy Statement dated April 7, 1997 for
     the annual  meeting of  shareholders  held May 19,  1997 and the  Company's
     definitive  Proxy  Statement  dated  October 21,  1997 with  respect to the
     Special Meeting of Shareholders held on December 1, 1997.

     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the  Exchange  Act after the date of this  Prospectus  and prior to the
termination  of the  offering  of  Shares  made  hereby  shall be  deemed  to be
incorporated  by reference  into this  Prospectus and to be part hereof from the
date  of  filing  of such  documents.  Any  statement  contained  in a  document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded  for purposes of this  Prospectus to the extent that a
statement  contained  herein or in any other  subsequently  filed document which
also is incorporated or deemed to be incorporated  herein modifies or supersedes
such  statement.  Any such  statement  so  modified or  superseded  shall not be
deemed,  except as so  modified  or  superseded,  to  constitute  a part of this
Prospectus.

     The Company  will provide  without  charge to each person to whom a copy of
this  Prospectus  is  delivered,  upon the  written or oral  request of any such
person, a copy of any or


                                       4
<PAGE>

all of the documents which have been or may be incorporated into this Prospectus
by  reference  (other than  exhibits to such  documents).  Written or  telephone
requests  for such  copies  should be directed  to Barry J.  Wagner,  Secretary,
Omnicom Group Inc., 437 Madison Avenue,  New York 10022;  telephone number (212)
415-3600.

                                   THE COMPANY

     The Company through its wholly and partially-owned  companies  (hereinafter
referred to as the "Omnicom Group"),  operates  advertising agencies which plan,
create,  produce  and place  advertising  in various  media such as  television,
radio,  newspaper  and  magazines.  The Omnicom  Group  offers its clients  such
additional services as marketing consultation,  consumer market research, design
and  production of  merchandising  and sales  promotion  programs and materials,
direct  mail  advertising,   corporate  identification,   public  relations  and
interactive  marketing.  The  Omnicom  Group  offers  these  services to clients
worldwide on a local, national,  pan-regional or global basis.  Operations cover
the major regions of North America, the United Kingdom,  Continental Europe, the
Middle East,  Latin America,  the Far East and Australia.  In 1996 and 1995, 51%
and 53%,  respectively,  of the Omnicom Group's  billings came from its non-U.S.
operations.

     According to the unaudited  industry wide figures  published in 1997 in the
trade  journal,  Advertising  Age,  Omnicom  was  ranked as the  second  largest
advertising agency group worldwide.

     The Omnicom Group operates as three separate,  independent agency networks:
the BBDO  Worldwide  Network,  the DDB  Needham  Worldwide  Network and the TBWA
International Network. The Company also operates two independent agencies, Cline
Davis & Mann and Goodby,  Silverstein & Partners,  certain marketing service and
specialty advertising companies through its Diversified Agency Services division
and certain interactive marketing companies through Communicade.

     The principal  executive  offices of the Company are located at 437 Madison
Avenue, New York, New York 10022. Its telephone number is (212) 415-3600.

                                 USE OF PROCEEDS

     The Company will not receive any of the  proceeds  from sales of the Common
Stock by the Selling Shareholders.


                                       5
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

     The Company's  authorized  capital consists of 300,000,000  shares of $0.50
par value Common Stock,  of which  161,969,510  were  outstanding  on January 2,
1998, and 7,500,000 shares of $1.00 par value Preferred Stock,  none of which is
outstanding. The foregoing reflects the two-for-one stock split in the form of a
one hundred  percent stock  dividend on the Company's  outstanding  Common Stock
payable to shareholders of record on December 16, 1997.

     Each share of Common Stock  entitles the holder  thereof to one vote on all
matters  submitted  to a vote of  shareholders.  All shares of Common Stock have
equal rights and are entitled to such  dividends as may be declared by the Board
of Directors out of funds legally  available  therefor and to share ratably upon
liquidation  in the assets  available  for  distribution  to  stockholders.  The
Company is not aware of any restrictions on its present or future ability to pay
dividends. However, in connection with certain borrowing facilities entered into
by the  Company  and  its  subsidiaries,  the  Company  is  subject  to  certain
restrictions  on the ratio of net cash flow to  consolidated  indebtedness,  the
ratio of total consolidated  indebtedness to total  consolidated  capitalization
and  on its  ability  to  make  investments  in  and  loans  to  affiliates  and
unconsolidated  subsidiaries.  The  Common  Stock  is not  subject  to  call  or
assessment,  has no preemptive conversion or cumulative voting rights and is not
subject to redemption.  The Company's  shareholders  elect a classified board of
directors and may not remove a director except by an affirmative two-thirds vote
of all outstanding  shares. A two-thirds vote is also required for the Company's
shareholders to amend the Company's by-laws or certain provisions of its charter
documents, and to change the number of directors comprising the full board.

     The Company may issue  preferred stock in series having whatever rights and
preferences  the  Board  of  Directors  may  determine.  One or more  series  of
preferred stock may be made convertible into Common Stock at rates determined by
the Board of Directors,  and preferred  stock may be given  priority over Common
Stock in payment of dividends,  rights on liquidation,  voting and other rights.
Preferred stock may be issued from time to time upon  authorization of the Board
of  Directors  without  action of the  shareholders.  The Company has no current
plans to issue any preferred stock.

     The  Company   currently  has  outstanding  (i)   $218,500,000  of  4  1/4%
Convertible Subordinated Debentures with a scheduled maturity in 2007, which are
convertible  into  Common  Stock at a  conversion  price of  $31.50,  subject to
adjustment  in  certain  events  and  (ii)  $230,000,000  of 2 1/4%  Convertible
Subordinated Debentures with a scheduled maturity in 2013, which are convertible
into Common  Stock at a conversion  price of $49.83,  subject to  adjustment  in
certain events.

     ChaseMellon  Shareholder Services,  L.L.C., 450 West 33rd Street, New York,
New York 10001 is the transfer agent and the registrar of the Common Stock.


                                       6
<PAGE>

     The Company mails to its  stockholders  annual reports  containing  audited
financial statements.

                       DESCRIPTION OF EXCHANGEABLE SHARES

     Pursuant  to  a  Combination   Agreement   dated   December  5,  1997  (the
"Combination  Agreement")  among the Company,  GPC  International  Holdings Inc.
("GPC"),  Jon Johnson  ("Johnson"),  3119025  Canada Inc.  ("3119025"),  1067913
Ontario Limited ("1067913"), Societal Ventures Corporation ("SVC"), Patrick Ross
("Ross"),  Torrance Wylie, James Crossland,  Howard Wendy ("Wendy") and Lee Feld
("Feld"),  (collectively,  Johnson, Ross, 3119025,  1067913, SVC, Wendy and Feld
are referred to as the  "Sellers"),  the Company  acquired 98% of the issued and
outstanding  shares of capital stock of GPC.

     Pursuant  to the  terms  of the  Combination  Agreement,  GPC  underwent  a
reorganization   of  capital   whereby  (i)  GPC  authorized  a  new  series  of
Exchangeable  Shares of GPC and (ii) each existing  Class A Common Share of GPC,
without par value (the "Class A Shares")  (other than the Class A Shares held by
the Company) was  converted at an exchange  ratio into a number of  Exchangeable
Shares  as  determined  in  accordance  with  the  Combination   Agreement.   As
consideration  for their  Class A Shares,  each  Seller was issued  Exchangeable
Shares.

     The  Exchangeable  Shares are subject to adjustment or  modification in the
event of a stock split or other changes to the capital  structure of the Company
so as to maintain the initial  relationship  between the Exchangeable Shares and
the Shares.

Exchange and Call Right

     Holders of the Exchangeable Shares are entitled at any time, subject to the
exercise by the Company of the Call Right (as defined  below),  to retract (i.e.
require  GPC to redeem)  any or all such  Exchangeable  Shares and to receive an
equivalent number of shares of Common Stock plus an additional amount equivalent
to all declared and unpaid dividends on such Exchangeable Shares. Holders of the
Exchangeable  Shares may effect such  retraction by presenting a certificate  or
certificates  to  GPC  or  its  transfer  agent   representing   the  number  of
Exchangeable  Shares the  holder  desires to  retract,  together  with a written
request as  described  in the letter of  transmittal,  specifying  the number of
Exchangeable  Shares  the holder  wishes to retract  and the date upon which the
holder  desires to receive the shares of Common Stock (the  "Retraction  Date"),
and such other  documents  as may be  required to effect the  retraction  of the
Exchangeable Shares.


                                       7
<PAGE>

     Upon receipt of the Exchangeable Shares from the holder thereof,  GPC shall
immediately  notify the Company of such request.  The Company  shall  thereafter
have until the Retraction Date in which to exercise its right (the "Call Right")
to purchase all of the  Exchangeable  Shares  submitted by the holder thereof by
the delivery of an  equivalent  number of shares of Common Stock to such holder.
In the event the  Company  determines  not to exercise  its Call  Right,  GPC is
obligated to deliver to the holder the number of shares of Common Stock equal to
the number of Exchangeable  Shares submitted by the holder for retraction on the
Retraction Date.

     Subject to  applicable  law and the call  rights of the  Company  described
above,  at any time on or after January 1, 2013, GPC has the right to redeem all
but not less than all of the then  outstanding  Exchangeable  Shares in exchange
for a number of shares of Common Stock equal to the number of such  Exchangeable
Shares,  plus an additional amount equivalent to the full amount of all declared
and unpaid dividends on such  Exchangeable  Shares.  In the event GPC determines
that it will exercise its redemption  right,  GPC shall, at least 90 days before
the  proposed   redemption  date,   provide  the  Company  and  each  holder  of
Exchangeable Shares with written notice of its intent to undertake redemption of
the Exchangeable Shares.

     The  Company  has  the  overriding  right,   notwithstanding  any  proposed
redemption of the Exchangeable  Shares by GPC as outlined above, to unilaterally
purchase,  on the  proposed  redemption  date,  all but not less than all of the
outstanding  Exchangeable  Shares in exchange  for one share of Common Stock for
each such  Exchangeable  Share, plus an additional amount equivalent to the full
amount of all declared and unpaid dividends on such Exchangeable Share, less any
tax required to be deducted and withheld therefrom by the Company.

Voting, Dividend and Liquidation Rights of Holders of Exchangeable Shares

     On January 9, 1998 (the "Closing Date"),  the Company,  GPC and ChaseMellon
Shareholder  Services,  L.L.C.  (the "Trustee")  entered into a Voting Trust and
Exchange Agreement (the "Voting Trust Agreement").  Pursuant to the terms of the
Voting Trust  Agreement,  the Company  deposited with the Trustee that number of
shares  of  Common  Stock  equivalent  to  the  number  of  Exchangeable  Shares
outstanding.  Holders of the Exchangeable  Shares have the right to instruct the
Trustee  as to the  manner of voting  an  equivalent  number of shares of Common
Stock  with  respect  to any  matter as to which  holders  of  Common  Stock are
entitled to vote.  The  Company  has  granted  such rights to the holders of the
Exchangeable Shares in exchange for the Call Rights.

     Holders of the Exchangeable  Shares have the right to receive  dividends of
cash or other  property  from GPC  equivalent  to any  dividends  granted by the
Company to holders of Common Stock.


                                       8
<PAGE>

     Upon the  liquidation or dissolution  of GPC,  holders of the  Exchangeable
Shares have  preferential  rights to receive  from GPC one share of Common Stock
for each  Exchangeable  Share they hold, plus an additional amount equivalent to
the full amount of any declared and unpaid  dividends on each such  Exchangeable
Share.  The Company  has the  overriding  right,  notwithstanding  any  proposed
liquidation,  dissolution,  or winding up of GPC, to  purchase  all but not less
than all of the  outstanding  Exchangeable  Shares in exchange  for one share of
Common  Stock  for each  such  Exchangeable  Share,  plus an  additional  amount
equivalent  to the full  amount of all  declared  and unpaid  dividends  on such
Exchangeable  Share less any tax to be  deducted or  withheld  therefrom  by the
Company,  from the holders of the Exchangeable  Shares, at the effective time of
any such liquidation, dissolution, or winding up.

     Upon the occurrence of a Company Liquidation Event (as described below), in
order for the holders of the  Exchangeable  Shares to  participate on a pro rata
basis with the holders of Common Stock, each holder of Exchangeable  Shares will
automatically receive one share of Common Stock for each Exchangeable Share they
hold,  plus an additional  amount  equivalent to the full amount of any declared
and unpaid  dividends on each such  Exchangeable  Share.  A Company  Liquidation
Event  means  (i) any  determination  by the  Company's  Board of  Directors  to
institute  voluntary  liquidation,  dissolution or winding up  proceedings  with
respect  to the  Company or to effect  any other  distribution  of assets of the
Company among its shareholders for the purpose of winding up its affairs or (ii)
immediately upon the earlier of (A) receipt by the Company of notice of, and (B)
the  Company  becoming  aware of, any  threatened  or  instituted  claim,  suit,
petition  or other  proceedings  with  respect to the  involuntary  liquidation,
dissolution or winding up of the Company or to effect any other  distribution of
assets of the Company among its  shareholders  for the purpose of winding up its
affairs  and the  failure  by the  Company  to  contest  in good  faith any such
proceedings commenced in respect of the Company within 15 days of becoming aware
thereof.  To effect the  automatic  exchange of  Exchangeable  Shares for Common
Stock, the Company will deem each Exchangeable  Share to be exchanged for Common
Stock on the fifth  business  day  prior to the  effective  date of the  Company
Liquidation Event.

Registration Rights Of The Holders of Exchangeable Shares

     Pursuant to the terms of the Registration  Rights Agreement dated as of the
Closing  Date  between the Company and the  Sellers  (the  "Registration  Rights
Agreement"),  the Company has filed with the Commission  the shelf  Registration
Statement, of which this Prospectus forms a part, covering resales by holders of
the  Shares.  The  Company  has  agreed to use  reasonable  efforts  to keep the
Registration  Statement  effective until the earlier of (i) the sale pursuant to
the Registration  Statement of all the Shares  registered  thereunder,  (ii) the
expiration  of the holding  period  applicable  to such Shares under Rule 144(k)
under the Securities Act or any successor  provision and (iii) the sale pursuant
to Rule 144 under the Securities Act of all the Shares. The Registration  Rights
Agreement  provides that the Company may suspend the use of this  Prospectus one
time in any three-month  period, or two


                                       9
<PAGE>

times in any 12-month period,  each such suspension period not to exceed 15 days
without extension and in no event to exceed 30 days, under certain circumstances
relating to pending corporate  developments,  public filings with the Commission
and similar  events.  The  Registration  Rights  Agreement  provides for Selling
Shareholders  to (i) be named as a Selling  Shareholder  in a supplement to this
Prospectus  and  (ii)  deliver  this  Prospectus   together  with  the  relevant
Prospectus   Supplement  to  purchasers,   and  further   provides  for  Selling
Shareholders  to be  bound  by  those  provisions  of  the  Registration  Rights
Agreement   which  are  applicable  to  the  Selling   Shareholders   (including
indemnification  provisions).  The Company has agreed to pay all expenses of the
Registration  Statement,  provide  to each  Selling  Shareholder  copies of this
Prospectus  and  the  relevant  Prospectus   Supplement,   notify  each  Selling
Shareholder  when the  Registration  Statement  has  become  effective  and take
certain  other  actions as are  required  to permit,  subject to the  foregoing,
unrestricted resales of the Shares.

                              SELLING SHAREHOLDERS

     The  Shares  are  being  registered  pursuant  to the  Registration  Rights
Agreement  which  provides that the Company file a  registration  statement with
regard to the Shares within 30 days following the Closing Date. Prior to any use
of this Prospectus in connection with an offering of the Shares, this Prospectus
will be  supplemented  to set forth the name and  number of shares  beneficially
owned by the Selling Shareholder intending to sell such Shares and the number of
Shares to be offered.  The Prospectus  Supplement will also disclose whether any
Selling  Shareholder  selling in connection with such Prospectus  Supplement has
held any  position  or office  with,  been  employed by or  otherwise  has had a
material  relationship  with,  the Company or any of its  affiliates  during the
three years prior to the date of the Prospectus Supplement.

                              PLAN OF DISTRIBUTION

     The Shares are being registered to permit public secondary  trading of such
Shares  by the  holders  thereof  from  time  to  time  after  the  date of this
Prospectus.  The Company has agreed,  among other  things,  to bear all expenses
(other than underwriting discounts and selling commissions and fees and expenses
of counsel  and other  advisors  to holders  of Shares) in  connection  with the
registration  and  sale of the  Shares  covered  by this  Prospectus;  provided,
however,  the  Company  has not  agreed to  provide,  or incur any  expenses  in
connection with, accountants' "cold comfort" letters, opinions of counsel, or to
enter  into  underwriting   agreements,   such  as  would  be  customary  in  an
underwritten offering.

         The Company will not receive any of the  proceeds  from the offering of
the Shares by the Selling  Shareholders.  The Selling  Shareholders  may sell or
distribute  some or all of the Common Stock from time to time through dealers or
brokers or other agents or directly to


                                       10
<PAGE>

one or more  purchasers  in  transactions  (which may involve  crosses and block
transactions) on the New York Stock Exchange,  privately negotiated transactions
(including sales pursuant to pledges) or in the over-the-counter market, or in a
combination  of such  transactions.  Such  transactions  may be  effected by the
Selling  Shareholders at market prices prevailing at the time of sale, at prices
related to such  prevailing  market prices,  at negotiated  prices,  or at fixed
prices,  which may be changed.  Broker-dealers  or agents  participating in such
transactions  as  agent  may  receive  compensation  in the  form of  discounts,
concessions or commissions  from the Selling  Shareholders  (and, if they act as
agent for the purchaser of such shares,  from such  purchaser).  Such discounts,
concessions or commissions as to a particular broker-dealer or agent might be in
excess of those customary in the type of transaction  involved.  This Prospectus
may  also be  used,  with  the  Company's  consent,  by  donees  of the  Selling
Shareholders,  or by other  persons  acquiring  Shares and who wish to offer and
sell such Shares under circumstances requiring its use.

     In  order  to  comply  with  the  securities  laws of  certain  states,  if
applicable,  the  Shares  will  be  sold  in  such  jurisdictions  only  through
registered or licensed  brokers or dealers.  In addition,  in certain states the
Shares may not be sold unless they have been registered or qualified for sale in
the applicable  state or an exemption  from the  registration  or  qualification
requirement is available and is complied with.

     The Selling  Shareholders and any broker-dealers or agents that participate
with the Selling Shareholders in the distribution of the Shares may be deemed to
be  "underwriters"  within the meaning of the Securities Act, in which event any
commissions  received by such  broker-dealers or agents and any profits realized
by the Selling  Shareholders on the resales of the Shares  purchased by them may
be deemed to be underwriting commissions or discounts under the Securities Act.

     In addition,  any securities  covered by this Prospectus  which qualify for
sale  pursuant  to Rule 144,  Rule 144A or any other  available  exemption  from
registration  under the  Securities Act may be sold under Rule 144, Rule 144A or
such other available exemption rather than pursuant to this Prospectus. There is
no  assurance  that any Selling  Shareholder  will sell any or all of the Shares
described herein, and any Selling Shareholder may transfer,  devise or gift such
securities by other means not described herein.

     The Company has advised the Selling Shareholders that the anti-manipulative
rules of  Regulation  M under the  Exchange  Act may apply to their sales in the
market,  has furnished the Selling  Shareholders  with a copy of these Rules and
has informed them of the need for delivery of copies of this Prospectus.

     The Registration  Rights Agreement provides for the Company and the Selling
Shareholders to indemnify each other against certain  liabilities  arising under
the Securities Act.


                                       11
<PAGE>

     The  Company has agreed to use its best  efforts to cause the  Registration
Statement to which this Prospectus relates to become effective as promptly as is
practicable and to keep the Registration  Statement  effective until the earlier
of (i) the  sale  pursuant  to the  Registration  Statement  of all  the  Shares
registered thereunder,  (ii) the expiration of the holding, period applicable to
such  Shares  under  Rule  144(k)  under  the  Securities  Act or any  successor
provision  and (iii) the sale pursuant to Rule 144 under the  Securities  Act of
all the Shares. The Registration  Rights Agreement provides that the Company may
suspend the use of this Prospectus in connection with sales of Shares by holders
one time in any three-month  period,  or two times in any 12-month period,  each
such suspension  period not to exceed 15 days without  extension and in no event
to exceed an  aggregate  of 30 days,  under  certain  circumstances  relating to
pending corporate  developments,  public filings with the Commission and similar
events.  Expenses of preparing  and filing the  Registration  Statement  and all
post-effective amendments will be borne by the Company.

                                     EXPERTS

     The consolidated  financial statements and schedules of the Company and its
subsidiaries incorporated by reference in this Registration Statement, have been
audited by Arthur Andersen LLP, independent public accountants to the extent and
for the periods indicated in their report with respect thereto, and are included
herein in  reliance  upon the  authority  of said firm as experts in giving said
reports.

                                  LEGAL MATTERS

     Certain  legal matters in  connection  with the legality of the  securities
offered  hereby  will be passed  upon for the  Company by Davis & Gilbert,  1740
Broadway,  New York, New York 10019. Members of Davis & Gilbert participating in
such matters own an aggregate of 7,550 shares of Common Stock of the Company.


                                       12
<PAGE>

                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution.

Expenses  payable in connection with the  distribution  of the securities  being
registered  (estimated  except for the  registration  fee), all of which will be
borne by the Registrant, are as follows:

         Registration Fee                                 $9,033
         Legal Fees And Expenses                           7,500*
         Miscellaneous Expenses                              500
                                                         -------
                                                         $17,033
                                                         =======
                                                         
         * Estimated

Item l5. Indemnification of Directors and Officers.

     The Registrant's Certificate of Incorporation contains a provision limiting
the  liability  of  directors  (except  for  approving  statutorily   prohibited
dividends,  share  repurchases  or  redemptions,   distributions  of  assets  on
dissolution or loans to directors) to acts or omissions in bad faith,  involving
intentional  misconduct  or a knowing  violation  of the law,  or  resulting  in
personal gain to which the director was not legally  entitled.  The Registrant's
By-Laws  provide  that an officer or director  will be  indemnified  against any
costs or  liabilities,  including  attorneys fees and amounts paid in settlement
with the  consent of the  Registrant  in  connection  with any claim,  action or
proceeding to the fullest extent permitted by the New York Business  Corporation
Law.

     Section  722(a) of the New York  Business  Corporation  Law provides that a
corporation  may  indemnify  any officer or director,  made or  threatened to be
made,  a party to an action or  proceeding  other than one by or in the right of
the corporation, including an action by or in the right of any other corporation
or other enterprise,  which any director or officer of the corporation served in
any  capacity  at the request of the  corporation,  because he was a director or
officer of the corporation, or served such other corporation or other enterprise
in any  capacity,  against  judgments,  fines,  amounts paid in  settlement  and
reasonable expenses, including attorneys' fees actually and necessarily incurred
as a result  of such  action  or  proceeding,  or any  appeal  therein,  if such
director or officer  acted,  in good faith,  for a purpose  which he  reasonably
believed to be in, or in the case of service for any other  corporation or other
enterprise, not opposed to, the best interests of the corporation and,


                                      II-1
<PAGE>

in criminal  actions or  proceedings,  in addition,  had no reasonable  cause to
believe that his conduct was unlawful.

     Section  722(c) of the New York  Business  Corporation  Law provides that a
corporation  may  indemnify  any officer or director  made,  or threatened to be
made,  a party to an action by or in the right of the  corporation  by reason of
the fact that he is or was a director  or officer of the  corporation,  or is or
was  serving at the request of the  corporation  as a director or officer of any
other corporation of any type or kind, or other enterprise, against amounts paid
in settlement and reasonable  expenses,  including  attorneys' fees actually and
necessarily incurred by him in connection with the defense or settlement of such
action,  or in connection  with an appeal  therein,  if such director or officer
acted, in good faith,  for a purpose which he reasonably  believed to be in, or,
in the case of service for another corporation or other enterprise,  not opposed
to, the best interests of the  corporation.  The corporation  may not,  however,
indemnify any officer or director pursuant to Section 722(c) in respect of (1) a
threatened  action,  or a pending action which is settled or otherwise  disposed
of, or (2) any claim,  issue or matter as to which such  person  shall have been
adjudged to be liable to the corporation, unless and only to the extent that the
court in which the action was brought or, if no action was brought, any court of
competent jurisdiction,  determines upon application,  that the person is fairly
and  reasonably  entitled to indemnity  for such portion of the  settlement  and
expenses as the court deems proper.

     Section  723 of the New York  Business  Corporation  Law  provides  that an
officer or director  who has been  successful  on the merits or otherwise in the
defense of a civil or criminal  action of the character set forth in Section 722
is entitled to indemnification as permitted in such section.  Section 724 of the
New York Business  Corporation Law permits a court to award the  indemnification
required by Section 722.

     The Company has entered  into  agreements  with its  directors to indemnify
them for  liabilities  or costs  arising out of any alleged or actual  breach of
duty, neglect, errors or omissions while serving as a director. The Company also
maintains and pays premiums for  directors'  and officers'  liability  insurance
policies.

Item 16. Exhibits and Financial Statement Schedules.

         Exhibit
         Number     Description of Exhibit
         ------     ----------------------
         5          Opinion of Davis & Gilbert as to the  legality  of
                    the shares of Common Stock registered hereunder

         23.1       Consent of Arthur Andersen LLP

         23.2       Consent  of Davis & Gilbert  (included  in Exhibit
                    Number 5)

         24.1       Power of Attorney (included on Signature Page)


                                      II-2
<PAGE>

Item 17. Undertakings.

     The undersigned Registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment to this Registration Statement:

          (i) To include  any  prospectus  required  by Section  10(a)(3) of the
          Securities Act of 1933;

          (ii) To reflect in the  prospectus  any facts or events  arising after
          the effective date of this Registration  Statement (or the most recent
          post-effective  amendment  thereof)  which,  individually  or  in  the
          aggregate, represent a fundamental change in the information set forth
          in this Registration  Statement.  Notwithstanding  the foregoing,  any
          increase  or decrease  in volume of  securities  offered (if the total
          dollar  value of  securities  offered  would not exceed that which was
          registered)  and  any  deviation  from  the  low  or  high  and of the
          estimated  maximum  offering  range  may be  reflected  in the form of
          prospectus  filed with the  Commission  pursuant to Rule 424(b) if, in
          the aggregate,  the changes in volume and price represent no more than
          20 percent change in the maximum aggregate offering price set forth in
          the   "Calculation  of  Registration   Fee"  table  in  the  effective
          Registration Statement; and

          (iii) To include any material  information with respect to the plan of
          distribution not previously  disclosed in this Registration  Statement
          or any  material  change  to such  information  in  this  Registration
          Statement.

     Provided however, that paragraphs (1)(i) and (1)(ii) shall not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in  periodic  reports  filed or as  furnished  to the
Commission  by the  Registrant  pursuant  to Section 13 or Section  15(d) of the
Securities  Exchange  Act of 1934 that are  incorporated  by  reference  in this
Registration Statement.

     (2) That, for the purpose of determining any liability under the Securities
Act of 1933,  each  such  post-effective  amendment  shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.


                                      II-3
<PAGE>

     (3) To remove from  registration  by means of  post-effective  amendment to
this Registration  Statement any of the securities being registered which remain
unsold at the termination of the offering.

     The  undersigned  Registrant  further  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in this Registration  Statement shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be  permitted  to  directors,  officers or persons  controlling  the
Registrant  pursuant  to the  provisions  described  under  Item  15  above,  or
otherwise, the Registrant has been advised that in the opinion of the Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for  indemnification  against  such  liabilities  (other than the payment by the
Registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  Registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.


                                      II-4
<PAGE>

                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on  its  behalf  by  the  undersigned,  hereunto  duly
authorized, in the City of New York, State of New York on January 16, 1998.

                                                     OMNICOM GROUP INC.
                                                         Registrant

                                                     By: /s/ John D. Wren
                                                        ------------------------
                                                         John D. Wren
                                                         Chief Executive Officer

                            ------------------------

     KNOW ALL MEN BY THESE PRESENTS,  that each person whose  signature  appears
below  constitutes  and appoints  John D. Wren and Barry J. Wagner,  and each of
them,  his true and lawful  attorney-in-fact  and agent,  with full and  several
power of substitution  and  resubstitution,  for him and in his name,  place and
stead,  in any  and  all  capacities,  to sign  any or all  amendments,  to this
Registration  Statement,  and to file the same, with all exhibits  thereto,  and
other  documents  in  connection  therewith,  with the  Securities  and Exchange
Commission,  granting  unto  said  attorneys-in-fact  and agent  full  power and
authority to do and perform each and every act and thing requisite and necessary
to be done in and about the  premises,  as fully to all intents and  purposes as
they or he might or could do in person, hereby ratifying and confirming all that
said attorneys-in-fact and agents or his substitute or substitutes, may lawfully
do or cause to be done by virtue hereof.


                                      II-5
<PAGE>

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
following capacities on January 16, 1998.
                                                                
                                                Chief Executive 
          /s/ John D. Wren                   Officer and Director      
- -------------------------------------        (Principal Executive 
              John D. Wren                          Officer)

          /s/ Fred J. Meyer                Chief Financial Officer 
- -------------------------------------       (Principal Financial    
              Fred J. Meyer                         Officer)              
                                                  
       /s/ Jonathan E. Ramsden                      Controller                 
- -------------------------------------               (Principal               
           Jonathan E. Ramsden                  Accounting Officer)
                                              
        /s/ Bernard Brochand                         Director
- -------------------------------------
            Bernard Brochand

       /s/ Robert J. Callander                       Director
- -------------------------------------
           Robert J. Callander

        /s/ James A. Cannon                          Director
- -------------------------------------
            James A. Cannon

     /s/ Leonard S. Coleman, Jr.                     Director
- -------------------------------------
         Leonard S. Coleman, Jr.


                                      II-6
<PAGE>

        /s/ Bruce Crawford                           Director
- -------------------------------------
          Bruce Crawford

       /s/ Susan S. Denison                          Director
- -------------------------------------
         Susan S. Denison

        /s/ John R. Murphy                           Director
- -------------------------------------
          John R. Murphy                             

       /s/ John R. Purcell                           Director  
- -------------------------------------
         John R. Purcell                                     

      /s/ Keith L. Reinhard                          Director  
- -------------------------------------
        Keith L. Reinhard                                   

       /s/ Allen Rosenshine                          Director
- -------------------------------------
         Allen Rosenshine                                    

         /s/ Gary L. Roubos                          Director  
- -------------------------------------
           Gary L. Roubos                                   

      /s/ Quentin I. Smith, Jr.                      Director  
- -------------------------------------                            
        Quentin I. Smith, Jr.                                           
                                                                 
        /s/ William G. Tragos                        Director  
- -------------------------------------                            
          William G. Tragos                                               
                                                                 
       /s/ Egon P.S. Zehnder                         Director
- -------------------------------------                            
         Egon P.S. Zehnder                                               


                                      II-7


 
                                                                      Exhibit 5
                                 DAVIS & GILBERT
                                  1740 Broadway
                            New York, New York 10019

                                                                January 16, 1998

Omnicom Group Inc.
437 Madison Avenue
New York, NY 10022

           Re: Registration Statement on Form S-3

Gentlemen:

     In our capacity as counsel to Omnicom  Group Inc.,  a New York  corporation
(the "Company"),  we have been asked to render this opinion in connection with a
Registration Statement on Form S-3 (the "Registration Statement") being filed by
the Company  contemporaneously  herewith  on behalf of the selling  shareholders
named  therein (the "Selling  Shareholders")  with the  Securities  and Exchange
Commission  under the Securities Act of 1933, as amended,  covering an aggregate
of 807,746 shares of common stock,  $.50 par value, of the Company being offered
for  the  respective   accounts  of  the  Selling   Shareholders  (the  "Selling
Shareholders' Shares").

     In that connection,  we have examined the Certificate of Incorporation  and
the  By-Laws,  both as amended,  of the  Company,  the  Registration  Statement,
corporate  proceedings  relating to the  issuance  of the Selling  Shareholders'
Shares, and such other instruments and documents as we deemed relevant under the
circumstances.

     In making the aforesaid  examinations,  we have assumed the  genuineness of
all signatures and the conformity to original  documents of all copies furnished
to us as original or photostatic copies. We have also assumed that the corporate
records  furnished to us by the Company include all corporate  proceedings taken
by the Company to date.

     Based upon and subject to the  foregoing,  we are of the  opinion  that the
Selling  Shareholders' Shares when issued will be legally issued, fully paid and
nonassessable shares of common stock, $.50 par value, of the Company.


                                      
<PAGE>

     We hereby  consent  to the use of our  opinion  as  herein  set forth as an
exhibit  to the  Registration  Statement  and to the use of our name  under  the
caption  "Legal  Matters" in the  Prospectus  forming  part of the  Registration
Statement.

                                                    Very truly yours,

                                                    DAVIS & GILBERT




                                                                    Exhibit 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

     As independent public  accountants,  we hereby consent to the incorporation
by reference  in this  Registration  Statement of our report dated  February 18,
1997 included in the Omnicom  Group Inc.  Form 10-K for the year ended  December
31,  1996  and to all  references  to our  Firm  included  in this  Registration
Statement.

                                                             ARTHUR ANDERSEN LLP

New York, New York
January 16, 1998




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