Document:

Exhibit 4.18

                             CERTIFICATE OF TRUST OF
                            OMNICOM CAPITAL TRUST III

      THIS  Certificate  of Trust of Omnicom  Capital Trust III (the "Trust") is
being  duly  executed  and filed on behalf of the Trust by the  undersigned,  as
trustee, to form a business trust under the Delaware Business Trust Act (12 Del.
C. ss. 3801 et seq.) (the "Act").

      1. Name.  The name of the  business  trust formed by this  Certificate  of
Trust is Omnicom Capital Trust III.

      2. Delaware  Trustee.  The name and business address of the trustee of the
Trust  in  the  State  of  Delaware  are  Chase  Manhattan  Bank  USA,  National
Association, 1201 Market Street, Wilmington, Delaware 19801.

      3.  Effective  Date.  This  Certificate  of Trust shall be effective  upon
filing.

      IN WITNESS WHEREOF,  the undersigned has duly executed this Certificate of
Trust in accordance with Section 3811(a)(1) of the Act.

                                 CHASE MANHATTAN BANK USA, NATIONAL ASSOCIATION,
                                 not in its individual capacity but solely as
                                 Trustee

                                 By:     /s/ John Cashin
                                      ------------------------------------------
                                 Name:  John Cashin
                                 Title: Vice PresidentExhibit 4.19

                                 TRUST AGREEMENT
                                       OF
                            OMNICOM CAPITAL TRUST III

      THIS TRUST AGREEMENT is made as of October 4, 2000 (this "Agreement"),  by
and between  Omnicom  Group Inc.,  a New York  corporation,  as  depositor  (the
"Depositor"),  and Chase Manhattan Bank USA,  National  Association,  a Delaware
banking corporation,  as trustee (the "Trustee").  The Depositor and the Trustee
hereby agree as follows:

      1. The trust created hereby shall be known as "Omnicom  Capital Trust III"
(the  "Trust"),  in which  name the  Trustee  or the  Depositor,  to the  extent
provided  herein,  may  conduct  the  business  of the Trust,  make and  execute
contracts, and sue and be sued.

      2. The Depositor hereby assigns,  transfers,  conveys and sets over to the
Trust the sum of $10. Such amount shall constitute the initial trust estate.  It
is the intention of the parties hereto that the Trust created hereby  constitute
a business  trust under Chapter 38 of Title 12 of the Delaware  Code, 12 Del. C.
ss.ss.  3801,  et seq.  (the  "Business  Trust  Act"),  and that  this  document
constitute  the  governing  instrument  of the  Trust.  The  Trustee  is  hereby
authorized  and  directed  to execute and file a  certificate  of trust with the
Delaware Secretary of State in such form as the Trustee may approve.

      3. The  Depositor  and the Trustee will enter into an amended and restated
Trust Agreement  satisfactory to each such party to provide for the contemplated
operation  of the  Trust  created  hereby  and  the  issuance  of the  preferred
securities and common securities referred to therein. Prior to the execution and
delivery of such amended and restated  Trust  Agreement,  the Trustee  shall not
have any duty or  obligation  hereunder  or with  respect  of the trust  estate,
except as otherwise  required by applicable law or as may be necessary to obtain
prior to such  execution  and  delivery  any  licenses,  consents  or  approvals
required by applicable  law or otherwise.  Notwithstanding  the  foregoing,  the
Trustee  may take all  actions  deemed  proper as are  necessary  to effect  the
transactions contemplated herein.

      4. The Depositor is hereby authorized, in its sole discretion, (i) to file
with the Securities and Exchange  Commission (the  "Commission") and to execute,
in the case of the 1933 Act  Registration  Statement  and 1934 Act  Registration
Statement  (as  herein  defined),  on behalf of the  Trust,  (a) a  Registration
Statement (the "1933 Act Registration  Statement"),  including all pre-effective
or post-effective  amendments  thereto,  relating to the registration  under the
Securities Act of 1933, as amended (the "1933 Act"), of the preferred securities
of the Trust, (b) any preliminary prospectus or prospectus or supplement thereto
relating to the preferred securities of the Trust required to be filed under the
1933 Act, and (c) if  required,  a  Registration  Statement on Form 8-A or other
appropriate  form  (the  "1934  Act  Registration  Statement"),   including  all
pre-effective   and   post-effective   amendments   thereto,   relating  to  the
registration  of the  preferred  securities  of the Trust  under the  Securities
Exchange Act of 1934, as amended;  (ii) to file with the New York Stock Exchange
or any other exchange  (collectively,  the  "Exchange") and execute on behalf of
the  Trust  a  listing  application  and  all  other  applications,  statements,
certificates,  agreements  and  other  instruments  as  shall  be  necessary  or
desirable  to cause the  preferred  securities  of the Trust to be listed on the
Exchange;  (iii) to file and  execute on behalf of the Trust such  applications,
reports,  surety  bonds,  irrevocable  consents,  appointments  of attorney  for
service of process  and other  papers and  documents  as shall be  necessary  or
desirable to register the preferred securities of the Trust under the securities
or "Blue  Sky" laws of such  jurisdictions  as the  Depositor,  on behalf of the
Trust, may deem necessary or desirable;  (iv) to execute, deliver and perform on
behalf of the  Trust,  an  underwriting  agreement  with the  Depositor  and the
underwriter or  underwriters  of the preferred  securities of the Trust;  (v) to
execute,  deliver and perform a depository  agreement with the initial  clearing
agency, relating to the preferred securities of the Trust; and (vi) to apply for
and obtain a tax identification number for the Trust.

<PAGE>

      In the event that any filing  referred to in this Section 4 is required by
the  rules and  regulations  of the  Commission,  the  Exchange  PORTAL or state
securities  or Blue  Sky  laws to be  executed  on  behalf  of the  Trust by the
Trustee,  the  Trustee,  in its  capacity  as trustee  of the  Trust,  is hereby
authorized  and  directed to join in any such filing and to execute on behalf of
the Trust any and all of the foregoing, it being understood that Chase Manhattan
Bank USA, National  Association,  in its capacity as trustee of the Trust, shall
not be required to join in any such filing or execute on behalf of the Trust any
such document  unless  required by the rules and  regulations of the Commission,
PORTAL,  the Exchange or state  securities or Blue Sky laws. In connection  with
all of the foregoing,  the Depositor  hereby  constitutes  and appoints Barry J.
Wagner,  Robert A. Profusek,  Dennis E. Hewitt and Linda E. Ransom, each of them
as  its  true  and  lawful  attorney-in-fact  and  agent,  with  full  power  of
substitution and  resubsititution  for the Depositor or in the Depositor's name,
place  and  stead,  in any and all  capacities,  to sign any and all  amendments
(including  all  pre-effective  and  post-effective  amendments) to the 1933 Act
Registration  Statement and any 1934 Act Registration  Statement and to file the
same,  with  all  exhibits  thereto,  and  any  other  documents  in  connection
therewith,  with the Commission,  granting unto said  attorney-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  connection  therewith,  as fully to all
intents  and  purposes  as the  Depositor  might or could do in  person,  hereby
ratifying  and  confirming  all  that  said  attorney-in-fact  and  agent or his
respective  substitute  or  substitutes,  shall do or cause to be done by virtue
hereof.

      5. This Agreement may be executed in one or more counterparts.

      6.  The  number  of  trustees  of the  Trust  initially  shall  be one and
thereafter  the number of trustees of the Trust shall be such number as shall be
fixed from time to time by a written  instrument  signed by the Depositor  which
may increase or decrease the number of trustees of the Trust; provided, however,
that to the extent  required by the Business Trust Act, one trustee of the Trust
shall either be a natural  person who is a resident of the State of Delaware or,
if not a natural person,  an entity which has its principal place of business in
the State of Delaware.  Subject to the  foregoing,  the Depositor is entitled to
appoint  or remove  without  cause  any  trustee  of the Trust at any time.  Any
trustee of the Trust may resign upon thirty days' prior notice to the Depositor.

      7. The  Depositor  hereby  agrees to (i)  reimburse  the  Trustee  for all
reasonable expenses (including reasonable fees and expenses of counsel and other
experts) and (ii) indemnify, defend and hold harmless the Trustee and any of the
officers,  directors,  employees  and agents of the  Trustee  (the  "Indemnified
Persons")  from  and  against  and all  losses,  damages,  liabilities,  claims,
actions,  suits, costs, expenses,  disbursements  (including the reasonable fees
and expenses of counsel),  taxes and penalties of any kind and nature whatsoever
(collectively, "Expenses"), to the extent that such Expenses arise out of or are
imposed  upon or asserted at any time  against  such  Indemnified  Persons  with
respect  to the  performance  of this  Agreement,  the  creation,  operation  or
termination  of the Trust or the  transactions  contemplated  hereby;  provided,
however,  that the Depositor  shall not be required to indemnify any Indemnified
Person for any Expenses which are a result of the willful misconduct,  bad faith
or gross negligence of such Indemnified Person.

      8. The Trust may be dissolved  and  terminated  before the issuance of the
preferred securities of the Trust at the election of the Depositor.

      9. This Agreement shall be governed by, and construed in accordance  with,
the laws of the State of Delaware (with regard to conflict of laws principles).

<PAGE>

      IN WITNESS  WHEREOF,  the parties  hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                            OMNICOM GROUP INC. as Depositor

                            By: /s/ Robert A. Profusek
                                -------------------------------------
                                Name:  Robert A. Profusek
                                Title:    Executive Vice President

                            CHASE MANHATTAN BANK USA, NATIONAL ASSOCIATION,
                            not in its individual capacity but solely as trustee
                            of the Trust

                            By: /s/ John Cashin
                                ------------------------------------------------
                                 Name: John Cashin
                                 Title: Vice President

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