Exhibit 4.3

                          REGISTRATION RIGHTS AGREEMENT

      THIS REGISTRATION RIGHTS AGREEMENT is made and entered into as of June 10,
2003 by and between Omnicom Group Inc., a New York corporation (the "Company"),
and J.P. Morgan Securities Inc., Goldman Sachs & Co., Citigroup Global Markets
Inc., ABN AMRO Rothschild LLC, HSBC Securities (USA) Inc., SG Cowen Securities
Corp. and Barclays Capital Inc. (the "Initial Purchasers") pursuant to the
Purchase Agreement, dated as of June 3, 2003 (the "Purchase Agreement"), between
the Company and the Initial Purchasers. In order to induce the Initial
Purchasers to enter into the Purchase Agreement, the Company has agreed to
provide the registration rights set forth in this Agreement. The execution of
this Agreement is a condition to the closing under the Purchase Agreement.

      The Company agrees with the Initial Purchasers, (i) for the benefit of the
Initial Purchasers and (ii) for the benefit of the beneficial owners (including
the Initial Purchasers) from time to time of the Securities (as defined herein)
and the beneficial owners from time to time of the Underlying Common Stock (as
defined herein) issued upon conversion of the Securities (each of the foregoing
a "Holder" and together the "Holders"), as follows:

      Section 1. Definitions. Capitalized terms used herein without definition
shall have their respective meanings set forth in the Purchase Agreement. As
used in this Agreement, the following terms shall have the following meanings:

      "Affiliate" means, with respect to any specified person, an "affiliate,"
as defined in Rule 144, of such person.

      "Amendment Effectiveness Deadline Date" has the meaning specified in
Section 2(d) hereof.

      "Applicable Conversion Price" means, as of any date of determination, the
Applicable Principal Amount of Securities as of such date of determination
divided by the Conversion Rate in effect as of such date of determination or, if
no Securities are then outstanding, the Conversion Rate that would be in effect
were Securities then outstanding.

      "Applicable Principal Amount" means $1,000 per Security or, if no
Securities are then outstanding, such sum calculated as if such Securities were
then outstanding.

      "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
that is not a day on which banking institutions in The City of New York are
authorized or obligated by law or executive order to close.

      "Common Stock" means any shares of Common Stock, par value $0.15 per
share, of the Company and any other shares of common stock as may constitute
"Common Stock" for purposes of the Indenture, including the Underlying Common
Stock.

      "Conversion Rate" has the meaning assigned to that term in the Indenture.


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      "Damages Accrual Period" has the meaning specified in Section 2(e) hereof.

      "Damages Payment Date" means each December 15 and June 15 in the case of
Securities and the Underlying Common Stock.

      "Deferral Notice" has the meaning specified in Section 3(i) hereof.

      "Deferral Period" has the meaning specified in Section 3(i) hereof.

      "Effectiveness Deadline Date" has the meaning specified in Section 2(a)
hereof.

      "Effectiveness Period" means the period of two years from the date the
Shelf Registration Statement is declared effective or such shorter period that
will terminate upon the earliest of the following: (A) when all the Securities
covered by the Shelf Registration Statement have been sold pursuant to the Shelf
Registration Statement, (B) when all shares of Common Stock issued upon
conversion of any such Securities that had not been sold pursuant to the Shelf
Registration Statement have been sold pursuant to the Shelf Registration
Statement and (C) when, in the written opinion of counsel to the Company, all
outstanding Registrable Securities held by persons which are not affiliates of
the Company may be resold without registration under the Securities Act pursuant
to Rule 144(k) under the Securities Act or any successor provision thereto.

      "Event" has the meaning specified in Section 2(e) hereof.

      "Event Termination Date" has the meaning specified in Section 2(e) hereof.

      "Event Date" has the meaning specified in Section 2(e) hereof.

      "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations of the SEC promulgated thereunder.

      "Filing Deadline Date" has the meaning specified in Section 2(a) hereof.

      "Holder" has the meaning specified in the second paragraph of this
Agreement.

      "Indenture" means the Indenture dated as of the date hereof between the
Company and the Trustee, pursuant to which the Securities are being issued.

      "Initial Shelf Registration Statement" has the meaning specified in
Section 2(a) hereof.

      "Issue Date" means June 10, 2003.

      "Liquidated Damages Amount" has the meaning specified in Section 2(e)
hereof.

      "Losses" has the meaning specified in Section 6 hereof.

      "Material Event" has the meaning specified in Section 3(i) hereof.


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      "Notice and Questionnaire" means a written notice delivered to the Company
containing substantially the information called for by the Selling
Securityholder Notice and Questionnaire attached as Annex A to the Offering
Memorandum of the Company dated June 3, 2003 relating to the Securities.

      "Notice Holder" means, on any date, any Holder that has delivered a Notice
and Questionnaire to the Company on or prior to such date.

      "Prospectus" means the prospectus included in any Registration Statement
(including, without limitation, a prospectus that discloses information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A or Rule 415 promulgated under the
Securities Act), as amended or supplemented by any amendment or prospectus
supplement, including post-effective amendments, and all materials incorporated
by reference or explicitly deemed to be incorporated by reference in such
Prospectus.

      "Purchase Agreement" has the meaning specified in the first paragraph of
this Agreement.

      "Record Holder" means, with respect to any Damages Payment Date relating
to any Securities or Underlying Common Stock as to which any Liquidated Damages
Amount has accrued, the registered holder of such Securities or Underlying
Common Stock, as the case may be, on the immediately preceding June 1 or
December 1.

      "Registrable Securities" means the Securities and the Underlying Common
Stock, until such securities have been converted or exchanged, and, at all times
subsequent to any such conversion or exchange, any securities into or for which
such securities have been converted or exchanged, and any security issued with
respect thereto upon any stock dividend, split or similar event until, in the
case of any such security, the earliest of (i) its effective registration under
the Securities Act and resale in accordance with the Registration Statement
covering it, (ii) the expiration of the holding period that would be applicable
thereto under Rule 144(k) were it not held by an Affiliate of the Company or
(iii) its sale to the public pursuant to Rule 144.

      "Registration Expenses" has the meaning specified in Section 5 hereof.

      "Registration Statement" means any registration statement of the Company
that covers any of the Registrable Securities pursuant to the provisions of this
Agreement, including the Prospectus, amendments and supplements to such
registration statement, including post-effective amendments, all exhibits and
all materials incorporated by reference or explicitly deemed to be incorporated
by reference in such registration statement.

      "Restricted Securities" has the meaning assigned to that term in Rule 144.

      "Rule 144" means Rule 144 under the Securities Act, as such Rule may be
amended from time to time, or any similar rule or regulation hereafter adopted
by the SEC.

      "Rule 144A" means Rule 144A under the Securities Act, as such Rule may be
amended from time to time, or any similar rule or regulation hereafter adopted
by the SEC.


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<PAGE>

      "SEC" means the U.S. Securities and Exchange Commission and any successor
agency.

      "Securities" means the Zero Coupon Zero Yield Convertible Notes due 2033
of the Company to be purchased pursuant to the Purchase Agreement and issued
under the Indenture.

      "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated by the SEC thereunder.

      "Shelf Registration Statement" means the Initial Shelf Registration
Statement and/or any Subsequent Shelf Registration.

      "Subsequent Shelf Registration Statement" has the meaning specified in
Section 2(b) hereof.

      "TIA" means the Trust Indenture Act of 1939, as amended.

      "Trustee" means JPMorgan Chase Bank (or any successor entity), the Trustee
under the Indenture.

      "Underlying Common Stock" means the Common Stock into which the Securities
are convertible or issued upon any such conversion.

      Section 2. Shelf Registration. (a) The Company shall prepare and file or
cause to be prepared and filed with the SEC, as soon as practicable but in any
event by the date (the "Filing Deadline Date") 90 days after the Issue Date, a
Registration Statement for an offering to be made on a delayed or continuous
basis pursuant to Rule 415 of the Securities Act registering the resale from
time to time by Holders thereof of all of the Registrable Securities (the
"Initial Shelf Registration Statement"). The Initial Shelf Registration
Statement shall be on Form S-3 or another appropriate form permitting
registration of such Registrable Securities for resale by such Holders in
accordance with the methods of distribution elected by the Holders and set forth
in the Initial Shelf Registration Statement. The Company shall use reasonable
efforts to cause the Initial Shelf Registration Statement to be declared
effective under the Securities Act as promptly as is practicable but in any
event by the date (the "Effectiveness Deadline Date") that is 150 days after the
Issue Date, and to keep the Initial Shelf Registration Statement (or any
Subsequent Shelf Registration Statement) continuously effective under the
Securities Act until the expiration of the Effectiveness Period; provided,
however, that no Holder shall be entitled to have the Registrable Securities
held by it covered by such Shelf Registration Statement unless such Holder shall
have provided a Notice and Questionnaire in accordance with Section 2(d) and is
in compliance with Section 4. None of the Company's security holders (other than
the Holders of Registrable Securities) shall have the right to include any of
the Company's securities in the Shelf Registration Statement.

      (b) If the Initial Shelf Registration Statement or any Subsequent Shelf
Registration Statement ceases to be effective for any reason at any time during
the Effectiveness Period (other than because all Registrable Securities
registered thereunder shall have been resold pursuant thereto or shall have
otherwise ceased to be Registrable Securities), the Company shall


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<PAGE>

use all reasonable efforts to obtain the prompt withdrawal of any order
suspending the effectiveness thereof, and in any event shall within 30 days of
such cessation of effectiveness amend the Shelf Registration Statement in a
manner reasonably expected to obtain the withdrawal of the order suspending the
effectiveness thereof, or file an additional Shelf Registration Statement
covering all of the securities that as of the date of such filing are
Registrable Securities (a "Subsequent Shelf Registration Statement"). If a
Subsequent Shelf Registration Statement is filed, the Company shall use all
reasonable efforts to cause the Subsequent Shelf Registration Statement to
become effective as promptly as is practicable after such filing and to keep
such Registration Statement (or subsequent Shelf Registration Statement)
continuously effective until the end of the Effectiveness Period.

      (c) The Company shall supplement and amend the Shelf Registration
Statement if required by the rules, regulations or instructions applicable to
the registration form used by the Company for such Shelf Registration Statement,
if required by the Securities Act or, as reasonably requested by the Initial
Purchasers or by the Trustee on behalf of the registered Holders.

      (d) Each Holder of Registrable Securities agrees that if such Holder
wishes to sell Registrable Securities pursuant to a Shelf Registration Statement
and related Prospectus, it will do so only in accordance with this Section 2(d)
and Section 3(i). Each Holder of Registrable Securities wishing to sell
Registrable Securities pursuant to a Shelf Registration Statement and related
Prospectus agrees to deliver a Notice and Questionnaire to the Company at least
five Business Days prior to any intended distribution of Registrable Securities
under the Shelf Registration Statement. From and after the date the Initial
Shelf Registration Statement is declared effective, the Company shall, as
promptly as is practicable after the date a Notice and Questionnaire is
delivered, and in any event within five Business Days after such date, (i) if
required by applicable law, file with the SEC a post-effective amendment to the
Shelf Registration Statement or prepare and, if required by applicable law, file
a supplement to the related Prospectus or a supplement or amendment to any
document incorporated therein by reference or file any other required document
so that the Holder delivering such Notice and Questionnaire is named as a
selling security holder in the Shelf Registration Statement and the related
Prospectus in such a manner as to permit such Holder to deliver such Prospectus
to purchasers of the Registrable Securities in accordance with applicable law
and, if the Company shall file a post-effective amendment to the Shelf
Registration Statement, use reasonable efforts to cause such post-effective
amendment to be declared effective under the Securities Act as promptly as is
practicable, but in any event by the date (the "Amendment Effectiveness Deadline
Date") that is 30 days after the date such post-effective amendment is required
by this clause to be filed, (ii) provide such Holder copies of any documents
filed pursuant to Section 2(d)(i), and (iii) notify such Holder as promptly as
practicable after the effectiveness under the Securities Act of any
post-effective amendment filed pursuant to Section 2(d)(i); provided, that if
such Notice and Questionnaire is delivered during a Deferral Period, the Company
shall so inform the Holder delivering such Notice and Questionnaire and shall
take the actions set forth in clauses (i), (ii) and (iii) above upon expiration
of the Deferral Period in accordance with Section 3(i), provided, further, that
if under applicable law the Company has more than one option as to the type or
manner of making any such filing, it will make the required filing or filings in
the manner or of a type that is reasonably expected to result in the earliest
availability of the Prospectus for effecting resales of Registrable Securities.
Notwithstanding anything contained herein to the


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<PAGE>

contrary, the Company shall be under no obligation to name any Holder that is
not a Notice Holder as a selling security holder in any Registration Statement
or related Prospectus; provided, however, that any Holder that becomes a Notice
Holder pursuant to the provisions of Section 2(d) of this Agreement (whether or
not such Holder was a Notice Holder at the time the Registration Statement was
declared effective) shall be named as a selling security holder in the
Registration Statement or related Prospectus in accordance with the requirements
of this Section 2(d).

      (e) The parties hereto agree that the Holders of Registrable Securities
will suffer damages, and that it would not be feasible to ascertain the extent
of such damages with precision, if (i) the Initial Shelf Registration Statement
has not been filed on or prior to the Filing Deadline Date, (ii) the Initial
Shelf Registration Statement has not been declared effective under the
Securities Act on or prior to the Effectiveness Deadline Date, (iii) the Company
has failed to perform its obligations set forth in Section 2(d) hereof within
the applicable time periods required therein, (iv) the aggregate duration of
Deferral Periods in any period exceeds the number of days permitted in respect
of such period pursuant to Section 3(i) hereof or (v) the number of Deferral
Periods in any period exceeds the number permitted in respect of such period
pursuant to Section 3(i) (each of the events of a type described in any of the
foregoing clauses (i) through (v) are individually referred to herein as an
"Event," and the Filing Deadline Date in the case of clause (i), the
Effectiveness Deadline Date in the case of clause (ii), the dates by which the
Company is required to perform its obligations set forth in Section 2(d) in the
case of clause (iii) (including the filing of any post-effective amendment prior
to the Amendment Effectiveness Deadline Date), the date on which the aggregate
duration of Deferral Periods in any period exceeds the number of days permitted
by Section 3(i) hereof in the case of clause (iv), and the date of the
commencement of a Deferral Period that causes the limit on the number of
Deferral Periods in any period under Section 3(i) hereof to be exceeded in the
case of clause (v), being referred to herein as an "Event Date"). An Event shall
be deemed to continue until the "Event Termination Date," which shall be the
following dates with respect to the respective types of Events: (1) the date the
Initial Shelf Registration Statement is filed in the case of an Event of the
type described in clause (i), (2) the date the Initial Shelf Registration
Statement is declared effective under the Securities Act in the case of an Event
of the type described in clause (ii), (3) the date the Company performs its
obligations set forth in Section 2(d) in the case of an Event of the type
described in clause (iii) (including, without limitation, the date the relevant
post-effective amendment to the Shelf Registration Statement is declared
effective under the Securities Act), (4) termination of the Deferral Period that
caused the limit on the aggregate duration of Deferral Periods in a period set
forth in Section 3(i) to be exceeded in the case of the commencement of an Event
of the type described in clause (iv), and (5) termination of the Deferral Period
the commencement of which caused the number of Deferral Periods in a period
permitted by Section 3(i) to be exceeded in the case of an Event of the type
described in clause (v).

      Accordingly, commencing on (and including) any Event Date and ending on
(but excluding) the next date on which no Events have occurred and are
continuing (a "Damages Accrual Period"), the Company agrees to pay, as
liquidated damages and not as a penalty, an amount (the "Liquidated Damages
Amount"), payable on the Damages Payment Dates to Record Holders of
then-outstanding Securities that are Registrable Securities and of
then-outstanding shares of Underlying Common Stock issued upon conversion of
Securities that are Registrable


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<PAGE>

Securities, as the case may be, accruing, for each portion of such Damages
Accrual Period beginning on and including a Damages Payment Date (or, in respect
of the first time that the Liquidation Damages Amount is to be paid to Holders
on a Damages Payment Date as a result of the occurrence of any particular Event,
from the Event Date) and ending on but excluding the first to occur of (A) the
date of the end of the Damages Accrual Period or (B) the Next Damages Payment
Date, at a rate per annum equal to one-quarter of one percent (0.25%) for the
first 90-day period from the Event Date, and thereafter at a rate per annum
equal to one-half of one percent (0.50%) of the aggregate Applicable Principal
Amount of such Securities and the aggregate Applicable Conversion Price of such
shares of Underlying Common Stock, as the case may be, in each case determined
as of the Business Day immediately preceding the next Damages Payment Date;
provided, that in the case of a Damages Accrual Period that is in effect solely
as a result of an Event of the type described in clause (iii) of the immediately
preceding paragraph, such Liquidated Damages Amount shall be paid only to the
Holders that have delivered Notice and Questionnaires that caused the Company to
incur the obligations set forth in Section 2(d or 3(i)), the non-performance of
which is the basis of such Event; provided further, that any Liquidated Damages
Amount accrued with respect to any Securities or portion thereof called for
redemption on a redemption date or converted into Underlying Common Stock on a
conversion date prior to the Damages Payment Date, shall, in any such event, be
paid instead to the Holder who submitted such Securities or portion thereof for
redemption or conversion on the applicable redemption date or conversion date,
as the case may be, on such date (or promptly following the conversion date, in
the case of conversion). Notwithstanding the foregoing, no Liquidated Damages
Amounts shall accrue as to any Registrable Security from and after the earlier
of (x) the date such security is no longer a Registrable Security, (y)
expiration of the Effectiveness Period, and (z) the Redemption Date on which
such Registrable Security is purchased by the Company in connection with a
Change of Control (as defined in Section 3.09(a) of the Indenture). The rate of
accrual of the Liquidated Damages Amount with respect to any period shall not
exceed the rate provided for in this paragraph notwithstanding the occurrence of
multiple concurrent Events. Following the cure of all Events requiring the
payment by the Company of Liquidated Damages Amounts to the Holders of
Registrable Securities pursuant to this Section, the accrual of Liquidated
Damages Amounts will cease (without in any way limiting the effect of any
subsequent Event requiring the payment of Liquidated Damages Amounts by the
Company).

      The Trustee shall be entitled, on behalf of Holders of Securities or
Underlying Common Stock, to seek any available remedy for the enforcement of
this Agreement, including for the payment of any Liquidated Damages Amount.
Notwithstanding the foregoing, the parties agree that the sole monetary damages
payable for a violation of the terms of this Agreement with respect to which
liquidated damages are expressly provided shall be such liquidated damages.
Nothing shall preclude a Notice Holder or Holder of Registrable Securities from
pursuing or obtaining specific performance or other equitable relief with
respect to this Agreement.

      All of the Company's obligations set forth in this Section 2(e) that are
outstanding with respect to any Registrable Security at the time such security
ceases to be a Registrable Security shall survive until such time as all such
obligations with respect to such security have been satisfied in full
(notwithstanding termination of this Agreement pursuant to Section 8(k)).


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<PAGE>

      The parties hereto agree that the liquidated damages provided for in this
Section 2(e) constitute a reasonable estimate of the damages that may be
incurred by Holders of Registrable Securities by reason of the failure of the
Shelf Registration Statement to be filed or declared effective or available for
effecting resales of Registrable Securities in accordance with the provisions
hereof.

      Section 3. Registration Procedures. In connection with the registration
obligations of the Company under Section 2, the Company shall:

      (a) Before filing any Registration Statement or Prospectus or any
amendments or supplements thereto with the SEC, furnish to the Initial
Purchasers copies of all such documents proposed to be filed and use reasonable
efforts to reflect in each such document when so filed with the SEC such
comments as the Initial Purchasers reasonably shall propose within three
Business Days of the delivery of such copies to the Initial Purchasers.

      (b) Subject to Section 3(c), prepare and file with the SEC such amendments
and post-effective amendments to each Registration Statement as may be necessary
to keep such Registration Statement continuously effective for the Effectiveness
Period; cause the related Prospectus to be supplemented by any required
Prospectus supplement, and as so supplemented to be filed pursuant to Rule 424
(or any similar provisions then in force) under the Securities Act; and use all
reasonable efforts to comply with the provisions of the Securities Act
applicable to it with respect to the disposition of all securities covered by
such Registration Statement during the Effectiveness Period in accordance with
the intended methods of disposition by the sellers thereof set forth in such
Registration Statement as so amended or such Prospectus as so supplemented.

      (c) As promptly as practicable give notice to the Notice Holders directly
or through the Trustee and the Initial Purchasers (i) when any Prospectus,
Prospectus supplement, Registration Statement or post-effective amendment to a
Registration Statement has been filed with the SEC and, with respect to a
Registration Statement or any post-effective amendment, when the same has been
declared effective, (ii) of any request, following the effectiveness of the
Initial Shelf Registration Statement under the Securities Act, by the SEC or any
other federal or state governmental authority for amendments or supplements to
any Registration Statement or related Prospectus or for additional information,
(iii) of the issuance by the SEC or any other federal or state governmental
authority of any stop order suspending the effectiveness of any Registration
Statement or the initiation or threatening of any proceedings for that purpose,
(iv) of the receipt by the Company of any notification with respect to the
suspension of the qualification or exemption from qualification of any of the
Registrable Securities for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose, (v) of the occurrence of (but
not the nature of or details concerning) a Material Event (provided, however,
that no notice by the Company shall be required pursuant to this clause (v) in
the event that the Company either promptly files a Prospectus supplement to
update the Prospectus or a Form 8-K or other appropriate Exchange Act report
that is incorporated by reference into the Registration Statement, which, in
either case, contains the requisite information with respect to such Material
Event that results in such Registration Statement no longer containing any
untrue statement of material fact or omitting to state a material fact necessary
to make the statements contained therein, in the light of the circumstances
under which they were made, not misleading) and


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<PAGE>

(vi) of the determination by the Company that a post-effective amendment to a
Registration Statement will be filed with the SEC, which notice may, at the
discretion of the Company (or as required pursuant to Section 3(i)), state that
it constitutes a Deferral Notice, in which event the provisions of Section 3(i)
shall apply.

      (d) Use all reasonable efforts to obtain the withdrawal of any order
suspending the effectiveness of a Registration Statement or the lifting of any
suspension of the qualification (or exemption from qualification) of any of the
Registrable Securities for sale in any jurisdiction in which they have been
qualified for sale, in either case at the earliest possible moment.

      (e) If reasonably requested by the Initial Purchasers or any Notice
Holder, promptly as reasonably practicable incorporate in a Prospectus
supplement or post-effective amendment to a Registration Statement such
information as the Initial Purchasers or such Notice Holder shall, on the basis
of an opinion of nationally-recognized counsel experienced in such matters,
determine to be required to be included therein by applicable law and make any
required filings of such Prospectus supplement or such post-effective amendment;
provided, that the Company shall not be required to take any actions under this
Section 3(e) that are not, in the reasonable opinion of counsel for the Company,
in compliance with applicable law.

      (f) Promptly as reasonably practicable furnish to each Notice Holder and
the Initial Purchasers, upon their request and without charge, at least one
conformed copy of the Registration Statement and any amendment thereto,
including financial statements but excluding schedules, all documents
incorporated or deemed to be incorporated therein by reference and all exhibits
(unless requested in writing to the Company by such Notice Holder or any Initial
Purchaser, as the case may be).

      (g) During the Effectiveness Period, deliver to each Notice Holder in
connection with any sale of Registrable Securities pursuant to a Registration
Statement, without charge, as many copies of the Prospectus or Prospectuses
relating to such Registrable Securities (including each preliminary prospectus)
and any amendment or supplement thereto as such Notice Holder may reasonably
request; and the Company hereby consents (except during such periods that a
Deferral Notice is outstanding and has not been revoked) to the use of such
Prospectus or each amendment or supplement thereto by each Notice Holder in
connection with any offering and sale of the Registrable Securities covered by
such Prospectus or any amendment or supplement thereto in the manner set forth
therein.

      (h) Prior to any public offering of the Registrable Securities pursuant to
the Shelf Registration Statement, use all reasonable efforts to register or
qualify or cooperate with the Notice Holders in connection with the registration
or qualification (or exemption from such registration or qualification) of such
Registrable Securities for offer and sale under the securities or Blue Sky laws
of such jurisdictions within the United States as any Notice Holder reasonably
requests in writing (which request may be included in the Notice and
Questionnaire); prior to any public offering of the Registrable Securities
pursuant to the Shelf Registration Statement, use all reasonable efforts to keep
each such registration or qualification (or exemption therefrom) effective
during the Effectiveness Period in connection with such Notice Holder's offer
and sale of Registrable Securities pursuant to such registration or
qualification (or exemption therefrom) and do any and all other acts or things
necessary or advisable to enable the disposition in such


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<PAGE>

jurisdictions of such Registrable Securities in the manner set forth in the
relevant Registration Statement and the related Prospectus; provided, that the
Company will not be required to (i) qualify as a foreign corporation or as a
dealer in securities in any jurisdiction where it would not otherwise be
required to qualify but for this Agreement or (ii) take any action that would
subject it to general service of process in suits or to taxation in any such
jurisdiction where it is not then so subject.

      (i) Upon (A) the issuance by the SEC of a stop order suspending the
effectiveness of the Shelf Registration Statement or the initiation of
proceedings with respect to the Shelf Registration Statement under Section 8(d)
or 8(e) of the Securities Act, (B) the occurrence of any event or the existence
of any fact (a "Material Event") as a result of which any Registration Statement
shall contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements
therein not misleading, or any Prospectus shall contain any untrue statement of
a material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading, or (C) the occurrence or existence
of any pending corporate development that, in the discretion of the Company,
makes it appropriate to suspend the availability of the Shelf Registration
Statement and the related Prospectus, (i) in the case of clause (B) above,
subject to the next sentence, as promptly as practicable prepare and file a
post-effective amendment to such Registration Statement or a supplement to the
related Prospectus or any document incorporated therein by reference or file any
other required document that would be incorporated by reference into such
Registration Statement and Prospectus so that such Registration Statement does
not contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements
therein not misleading, and such Prospectus does not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading, as thereafter
delivered to the purchasers of the Registrable Securities being sold thereunder,
and, in the case of a post-effective amendment to a Registration Statement,
subject to the next sentence, use all reasonable efforts to cause it to be
declared effective as promptly as is reasonably practicable, and (ii) give
notice to the Notice Holders that the availability of the Shelf Registration
Statement is suspended (a "Deferral Notice") and, upon receipt of any Deferral
Notice, each Notice Holder agrees not to sell any Registrable Securities
pursuant to the Registration Statement until such Notice Holder's receipt of
copies of the supplemented or amended Prospectus provided for in clause (i)
above, or until it is advised in writing by the Company that the Prospectus may
be used, and has received copies of any additional or supplemental filings that
are incorporated or deemed incorporated by reference in such Prospectus. The
Company will all use reasonable efforts to ensure that the use of the Prospectus
may be resumed (x) in the case of clause (A) above, as promptly as is
practicable, (y) in the case of clause (B) above, as soon as, in the sole
judgment of the Company, public disclosure of such Material Event would not be
prejudicial to or contrary to the interests of the Company or, if necessary to
avoid unreasonable burden or expense, as soon as reasonably practicable
thereafter and (z) in the case of clause (C) above, as soon as, in the
discretion of the Company, such suspension is no longer appropriate. The period
during which the availability of the Registration Statement and any Prospectus
is suspended (the "Deferral Period") shall, without the Company incurring any
obligation to pay liquidated damages pursuant to Section 2(e), not exceed 45
days in any three-month period and 90 days in any twelve-month period.


                                       10
<PAGE>

      (j) If reasonably requested in writing in connection with a disposition of
Registrable Securities pursuant to a Registration Statement, make reasonably
available for inspection during normal business hours by a representative for
the Notice Holders of such Registrable Securities and any broker-dealers,
attorneys and accountants retained by such Notice Holders, all relevant
financial and other records, pertinent corporate documents and properties of the
Company and its subsidiaries, and cause the appropriate executive officers,
directors and designated employees of the Company and its subsidiaries to make
reasonably available for inspection during normal business hours all relevant
information reasonably requested by such representative for the Notice Holders
or any such broker-dealers, attorneys or accountants in connection with such
disposition, in each case as is customary for similar "due diligence"
examinations; provided, however, that such persons shall first agree in writing
with the Company that any information that is reasonably and in good faith
designated by the Company in writing as confidential at the time of delivery of
such information shall be kept confidential by such persons and shall be used
solely for the purposes of exercising rights under this Agreement, unless (i)
disclosure of such information is required by court or administrative order or
is necessary to respond to inquiries of regulatory authorities, (ii) disclosure
of such information is required by law (including any disclosure requirements
pursuant to federal securities laws in connection with the filing of any
Registration Statement or the use of any Prospectus referred to in this
Agreement), (iii) such information becomes generally available to the public
other than as a result of a disclosure or failure to safeguard by any such
person or (iv) such information becomes available to any such person from a
source other than the Company and such source is not bound by a confidentiality
agreement; and provided further, that the foregoing inspection and information
gathering shall, to the greatest extent possible, be coordinated on behalf of
all the Notice Holders and the other parties entitled thereto by the counsel
referred to in Section 5.

      (k) The Company will timely file such reports pursuant to the Exchange Act
as are necessary in order to make generally available to its security holders,
as soon as practicable, an earning statement for the purposes of, and to provide
the benefits contemplated by, the last paragraph of Section 11(a) of the
Securities Act.

      (l) Cooperate with each Notice Holder to facilitate the timely preparation
and delivery of certificates representing Registrable Securities sold pursuant
to a Registration Statement, and cause such Registrable Securities to be in such
denominations as are permitted by the Indenture and registered in such names as
such Notice Holder may request in writing at least two Business Days prior to
any sale of such Registrable Securities.

      (m) Provide a CUSIP number for all Registrable Securities covered by each
Registration Statement not later than the effective date of such Registration
Statement and provide the Trustee for the Securities and the transfer agent for
the Securities with printed certificates for the Registrable Securities that are
in a form eligible for deposit with The Depository Trust Company.

      (n) Make a reasonable effort to provide such information as is required
for any filings required to be made with the National Association of Securities
Dealers, Inc.

      (o) Upon (i) the filing of the Initial Shelf Registration Statement and
(ii) the effectiveness of the Initial Shelf Registration Statement, promptly
notify the holders of Securities


                                       11
<PAGE>

thereof and use reasonable best efforts to post this information on the
Company's web site or, at the Company's option, otherwise publicly disclose this
information.

      (p) Cause the Indenture to be qualified under the TIA not later than the
effective date of any Registration Statement; and in connection therewith,
cooperate with the Trustee to effect such changes to the Indenture as may be
required for the Indenture to be so qualified in accordance with the terms of
the TIA and execute, and use all reasonable efforts to cause the Trustee to
execute, all documents as may be required to effect such changes, and all other
forms and documents required to be filed with the SEC to enable the Indenture to
be so qualified in a timely manner.

      Section 4. Holder's Obligations. Each Holder agrees, by acquisition of the
Registrable Securities, that no Holder of Registrable Securities shall be
entitled to sell any of such Registrable Securities pursuant to a Registration
Statement or to receive a Prospectus relating thereto, unless such Holder has
furnished the Company with a Notice and Questionnaire as required pursuant to
Section 2(d) (including the information required to be included in such Notice
and Questionnaire) and the information set forth in the next sentence. Each
Notice Holder agrees promptly to furnish to the Company all information required
to be disclosed in order to make the information previously furnished to the
Company by such Notice Holder not misleading and any other information regarding
such Notice Holder and the distribution of such Registrable Securities as may be
required in the reasonable view of the Company to be disclosed in the
Registration Statement under applicable law.

      Section 5. Registration Expenses. The Company shall bear all fees and
expenses incurred in connection with the performance by the Company of its
obligations under Sections 2 and 3 whether or not any of the Registration
Statements are declared effective. Such fees and expenses shall include, without
limitation, (i) all registration and filing fees (including, without limitation,
fees and expenses (x) with respect to filings required to be made with the
National Association of Securities Dealers, Inc. and (y) of compliance with
federal and state securities or Blue Sky laws (including, without limitation,
reasonable fees and disbursements of the counsel specified in the next sentence
in connection with Blue Sky qualifications of the Registrable Securities under
the laws of such jurisdictions as the Notice Holders of a majority of the
Registrable Securities being sold pursuant to a Registration Statement may
reasonably designate), (ii) printing expenses (including, without limitation,
expenses of printing certificates for Registrable Securities in a form eligible
for deposit with The Depository Trust Company), (iii) duplication expenses
relating to copies of any Registration Statement or Prospectus requested by and
delivered to any Holders hereunder, (iv) fees and disbursements of counsel for
the Company in connection with the Shelf Registration Statement, and (v)
reasonable fees and disbursements of the Trustee and its counsel and of the
registrar and transfer agent for the Common Stock. In addition, the Company
shall bear or reimburse the Notice Holders for the reasonable fees and
disbursements of one firm of legal counsel for the Holders, which shall
initially be Shearman & Sterling, but which may, upon the written consent of the
Initial Purchasers (which shall not be unreasonably withheld), be another
nationally recognized law firm experienced in securities law matters designated
by the Company. In addition, the Company shall pay the internal expenses of the
Company (including, without limitation, all salaries and expenses of officers
and employees performing legal or accounting duties), the expense of any annual
audit, the fees and expenses incurred in connection with the listing of the


                                       12
<PAGE>

Registrable Securities on any securities exchange on which similar securities of
the Company are then listed and the fees and expenses of any person, including
special experts, retained by the Company. Notwithstanding the foregoing, the
fees and expenses payable by the Company under this Section 5 shall not include
any underwriting fees, discounts, broker-dealer commissions or selling
commissions payable in connection with any underwritten offering of Registrable
Securities.

      Section 6. Indemnification; Contribution. (a) The Company agrees to
indemnify and hold harmless the Initial Purchasers and each holder of
Registrable Securities and each person, if any, who controls the Initial
Purchasers or any holder of Registrable Securities within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act, as follows:

            (i) against any and all loss, liability, claim, damage and expense
      whatsoever, as incurred, arising out of any untrue statement or alleged
      untrue statement of a material fact contained in the Registration
      Statement (or any amendment thereto), or the omission or alleged omission
      therefrom of a material fact necessary in order to make the statements
      therein, in light of the circumstances under which they were made, not
      misleading or arising out of any untrue statement or alleged untrue
      statement of a material fact included in any preliminary prospectus or the
      Prospectus (or any amendment or supplement thereto), or the omission or
      alleged omission therefrom of a material fact necessary in order to make
      the statements therein, in the light of the circumstances under which they
      were made, not misleading;

            (ii) against any and all loss, liability, claim, damage and expense
      whatsoever, as incurred, to the extent of the aggregate amount paid in
      settlement of any litigation, or any investigation or proceeding by any
      governmental agency or body, commenced or threatened, or of any claim
      whatsoever based upon any such untrue statement or omission, or any such
      alleged untrue statement or omission, provided that (subject to Section
      6(d)) any such settlement is effected with the prior written consent of
      the Company; and

            (iii) against any and all expense whatsoever, as incurred (including
      the fees and disbursements of counsel), reasonably incurred in
      investigating, preparing or defending against any litigation, or any
      investigation or proceeding by any governmental agency or body, commenced
      or threatened, or any claim whatsoever based upon any such untrue
      statement or omission, or any such alleged untrue statement or omission,
      to the extent that any such expense is not paid under subsections (i) or
      (ii) above;

provided, however, that this indemnity shall not apply to any loss, liability,
claim, damage or expense to the extent arising out of any untrue statement or
omission or alleged untrue statement or omission made in reliance upon and in
conformity with information relating to the Initial Purchasers furnished to the
Company in writing by the Initial Purchasers or a Holder of Registrable
Securities (which also acknowledges the indemnity provisions herein) and each
person, if any, who controls any Initial Purchaser or any such Holder of
Registrable Securities expressly for use in the Registration Statement (or any
amendment thereto), or any preliminary prospectus or the Prospectus (or any
amendment or supplement thereto).


                                       13
<PAGE>

      (b) In connection with any Shelf Registration in which a Holder,
including, without limitation, the Initial Purchasers, of Registrable Securities
is participating, in furnishing information relating to such Holder of
Registrable Securities to the Company in writing expressly for use in such
Registration Statement, any preliminary prospectus, the Prospectus or any
amendments or supplements thereto, the Holders of such Registrable Securities
agree, severally and not jointly, to indemnify and hold harmless the Initial
Purchasers and each person, if any, who controls any Initial Purchaser within
the meaning of either Section 15 of the Securities Act or Section 20 of the
Exchange Act and the Company, and each person, if any, who controls the Company
within the meaning of either such Section, against any and all loss, liability,
claim, damage and expense described in the indemnity contained in subsection (a)
of this Section, as incurred, but only with respect to untrue statements or
omissions, or alleged untrue statements or omissions, made in the Registration
Statement (or any amendment thereto), or any preliminary prospectus or the
Prospectus (or any amendment or supplement thereto) in reliance upon and in
conformity with written information furnished to the Company by such Holder of
Registrable Securities (which also acknowledges the indemnity provisions herein)
and each person, if any, who controls any such Holder of Registrable Securities
expressly for use in the Registration Statement (or any amendment thereto) or
such preliminary prospectus or the Prospectus (or any amendment or supplement
thereto).

      The Initial Purchasers agree to indemnify and hold harmless the Company,
the Holders of Registrable Securities, and each person, if any, who controls the
Company or any Holder of Registrable Securities within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act against any
and all loss, liability, claim, damage and expense described in the indemnity
contained in subsection (a) of this Section, as incurred, but only with respect
to untrue statements or omissions, or alleged untrue statements or omissions,
made in the Registration Statement (or any amendment thereto), or any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto) in reliance upon and in conformity with written information furnished
to the Company by the Initial Purchasers expressly for use in the Registration
Statement (or any amendment thereto) or such preliminary prospectus or the
Prospectus (or any amendment or supplement thereto).

      (c) Each indemnified party shall give notice as promptly as reasonably
practicable to each indemnifying party of any action commenced against it in
respect of which indemnity may be sought hereunder, but failure to so notify an
indemnifying party (i) shall not relieve such indemnifying party from any
liability hereunder to the extent it is not materially prejudiced as a result
thereof and (ii) in any event shall not relieve it from any liability which it
may have otherwise than on account of this indemnity agreement. An indemnifying
party may participate at its own expense in the defense of any such action;
provided, however, that counsel to the indemnifying party shall not (except with
the consent of the indemnified party) also be counsel to the indemnified party.
In no event shall the indemnifying parties be liable for fees and expenses of
more than one counsel (in addition to any local counsel) separate from their own
counsel for all indemnified parties in connection with any one action or
separate but similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances. No indemnifying party shall,
without the prior written consent of the indemnified parties, settle or
compromise or consent to the entry of any judgment with respect to any
litigation, or any investigation or proceeding by any governmental agency or
body, commenced or threatened, or any claim whatsoever in respect of which
indemnification or contribution could


                                       14
<PAGE>

be sought under this Section 6 hereof (whether or not the indemnified parties
are actual or potential parties thereto), unless such settlement, compromise or
consent (i) includes an unconditional release of each indemnified party from all
liability arising out of such litigation, investigation, proceeding or claim and
(ii) does not include a statement as to or an admission of fault, culpability or
a failure to act by or on behalf of any indemnified party.

      (d) If at any time an indemnified party shall have requested an
indemnifying party to reimburse the indemnified party for fees and expenses of
counsel, such indemnifying party agrees that it shall be liable for any
settlement of the nature contemplated by Section 6(a)(ii) effected without its
written consent if (i) such settlement is entered into more than 45 days after
receipt by such indemnifying party of aforesaid request, (ii) such indemnifying
party shall have received notice of the terms of such settlement at least 30
days prior to such settlement being entered into and (iii) such indemnifying
party shall not have reimbursed such indemnified party in accordance with such
request prior to the date of such settlement.

      (e) If the indemnification provided for in this Section 6 is for any
reason unavailable to or insufficient to hold harmless an indemnified party in
respect of any losses, liabilities, claims, damages or expenses referred to
therein, then each indemnifying party shall contribute to the aggregate amount
of such losses, liabilities, claims, damages and expenses incurred by such
indemnified party, as incurred, in such proportion as is appropriate to reflect
the relative fault of the indemnifying party or parties on the one hand and of
the indemnified party on the other hand in connection with the statements or
omissions which resulted in such losses, liabilities, claims, damages or
expenses, as well as any other relevant equitable considerations.

      The relative fault of the Company on the one hand and the Holders of the
Registrable Securities or the Initial Purchasers on the other hand shall be
determined by reference to, among other things, whether any such untrue or
alleged untrue statement of a material fact or omission or alleged omission to
state a material fact relates to information supplied by the Company or by the
Holder of the Registrable Securities or the Initial Purchasers and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission.

      The Company, the Initial Purchasers and the Holders of Registrable
Securities agree that it would not be just and equitable if contribution
pursuant to this Section 6(e) were determined by pro rata allocation or by any
other method of allocation which does not take account of the equitable
considerations referred to above in this Section 6(e). The aggregate amount of
losses, liabilities, claims, damages, and expenses incurred by an indemnified
party and referred to above in this Section 6(e) shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
investigating, preparing or defending against any litigation, or any
investigation or proceeding by any governmental agency or body, commenced or
threatened, or any claim whatsoever based upon any such untrue or alleged untrue
statement or omission or alleged omission.

      Notwithstanding the provisions of this Section 6, neither the Holder of
any Registrable Securities nor the Initial Purchasers, shall be required to
indemnify or contribute any amount in excess of the amount by which the total
price at which the Registrable Securities were sold by such Holder of
Registrable Securities pursuant to a Registration Statement or resold by


                                       15
<PAGE>

the Initial Purchasers as contemplated by the Purchase Agreement as the case may
be, exceeds the amount of any damages that such Holder of Registrable Securities
has or the Initial Purchasers have otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission.

      No person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from any
person who was not guilty of such fraudulent misrepresentation.

      For purposes of this Section 6(e), each person, if any, who controls an
Initial Purchaser or any Holder of Registrable Securities within the meaning of
Section 15 of the Securities Act or Section 20 of the Exchange Act shall have
the same rights to contribution as the Initial Purchasers or such Holder, and
each person, if any, who controls the Company within the meaning of Section 15
of the Securities Act or Section 20 of the Exchange Act shall have the same
rights to contribution as the Company.

      Section 7. Information Requirements. (a) The Company covenants that, if at
any time before the end of the Effectiveness Period the Company is not subject
to the reporting requirements of the Exchange Act, it will cooperate with any
Holder of Registrable Securities and take such further reasonable action as any
Holder of Registrable Securities may reasonably request in writing (including,
without limitation, making such reasonable representations as any such Holder
may reasonably request), all to the extent required from time to time to enable
such Holder to sell Registrable Securities without registration under the
Securities Act within the limitation of the exemptions provided by Rule 144 and
Rule 144A and customarily taken in connection with sales pursuant to such
exemptions. Upon the written request of any Holder of Registrable Securities,
the Company shall deliver to such Holder a written statement as to whether it
has complied with such filing requirements, unless such a statement has been
included in the Company's most recent report required to be filed and filed
pursuant to Section 13 or Section 15(d) of Exchange Act. Notwithstanding the
foregoing, nothing in this Section 7 shall be deemed to require the Company to
register any of its securities (other than the Common Stock) under any section
of the Exchange Act.

      Section 8. Miscellaneous.

      (a) No Conflicting Agreements. The Company is not, as of the date hereof,
a party to, nor shall it, on or after the date of this Agreement, enter into,
any agreement with respect to its securities that interferes with the rights
granted to the Holders of Registrable Securities in this Agreement. The Company
represents and warrants that the rights granted to the Holders of Registrable
Securities hereunder do not in any way interfere with the rights granted to the
holders of the Company's securities under any other agreements.

      (b) Amendments and Waivers. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given, unless the Company has obtained the written consent of Holders of a
majority of the then outstanding Underlying Common Stock constituting
Registrable Securities (with Holders of Securities deemed to be the Holders, for
purposes of this Section, of the number of outstanding shares of Underlying


                                       16
<PAGE>

Common Stock into which such Securities are or would be convertible or
exchangeable as of the date on which such consent is requested). Notwithstanding
the foregoing, a waiver or consent to depart from the provisions hereof with
respect to a matter that relates exclusively to the rights of Holders of
Registrable Securities whose securities are being sold pursuant to a
Registration Statement and that does not directly or indirectly affect the
rights of other Holders of Registrable Securities may be given by Holders of at
least a majority of the Registrable Securities being sold by such Holders
pursuant to such Registration Statement; provided, that the provisions of this
sentence may not be amended, modified, or supplemented except in accordance with
the provisions of the immediately preceding sentence. Each Holder of Registrable
Securities outstanding at the time of any such amendment, modification,
supplement, waiver or consent or thereafter shall be bound by any such
amendment, modification, supplement, waiver or consent effected pursuant to this
Section 8(b), whether or not any notice, writing or marking indicating such
amendment, modification, supplement, waiver or consent appears on the
Registrable Securities or is delivered to such Holder.

      (c) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, by telecopier, by
courier guaranteeing overnight delivery or by first-class mail, return receipt
requested, and shall be deemed given (i) when made, if made by hand delivery,
(ii) upon confirmation, if made by telecopier, (iii) one (1) Business Day after
being deposited with such courier, if made by overnight courier or (iv) on the
date indicated on the notice of receipt, if made by first-class mail, to the
parties as follows:

            (w) if to a Holder of Registrable Securities, at the most current
      address given by such Holder to the Company in a Notice and Questionnaire
      or any amendment thereto;

            (x) if to the Company, to:

            Omnicom Group Inc.
            437 Madison Avenue, 9th Floor
            New York, New York 10022
            Attention: General Counsel
            Fax.: (212) 415-3670

            with a copy to:

            Jones, Day, Reavis & Pogue
            599 Lexington Avenue
            New York, New York 10022
            Attention: Robert Profusek
            Fax: (212) 755-7306

            and


                                       17
<PAGE>

            (y) if to the Initial Purchasers, to:

            J.P. Morgan Securities Inc.
            277 Park Avenue, 9th Floor
            New York, New York 10172
            Attention: Syndicate Department
            Fax: (212) 622-2071

or to such other address as such person may have furnished to the other persons
identified in this Section 8(c) in writing in accordance herewith.

      (d) Approval of Holders. Whenever the consent or approval of Holders of a
specified percentage of Registrable Securities is required hereunder, the
Registrable Securities held by the Company or its controlled Affiliates (other
than the Initial Purchasers or subsequent Holders of Registrable Securities if
such subsequent Holders are deemed to be such Affiliates solely by reason of
their holdings of such Registrable Securities) shall not be counted in
determining whether such consent or approval was given by the Holders of such
required percentage.

      (e) Successors and Assigns. Any person who purchases any Registrable
Securities from the Initial Purchasers shall be deemed, for purposes of this
Agreement, to be an assignee of the Initial Purchasers. This Agreement shall
inure to the benefit of and be binding upon the successors and assigns of each
of the parties and shall inure to the benefit of and be binding upon each Holder
of any Registrable Securities.

      (f) Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be original and all of which taken together
shall constitute one and the same agreement.

      (g) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

      (h) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE
AND PERFORMED WITHIN THE STATE OF NEW YORK WITHOUT GIVING EFFECT TO THE
PRINCIPLES OF CONFLICT OF LAWS.

      (i) Severability. If any term, provision, covenant or restriction of this
Agreement is held to be invalid, illegal, void or unenforceable, the remainder
of the terms, provisions, covenants and restrictions set forth herein shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated thereby, and the parties hereto shall use their best efforts to find
and employ an alternative means to achieve the same or substantially the same
result as that contemplated by such term, provision, covenant or restriction, it
being intended that all of the rights and privileges of the parties shall be
enforceable to the fullest extent permitted by law.


                                       18
<PAGE>

      (j) Entire Agreement. This Agreement is intended by the parties as a final
expression of their agreement and is intended to be a complete and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject matter contained herein and the registration rights granted by the
Company with respect to the Registrable Securities. Except as provided in the
Purchase Agreement, there are no restrictions, promises, warranties or
undertakings, other than those set forth or referred to herein, with respect to
the registration rights granted by the Company with respect to the Registrable
Securities. This Agreement supersedes all prior agreements and undertakings
among the parties with respect to such registration rights.

      (k) Termination. This Agreement and the obligations of each Person
hereunder shall terminate upon the expiration of the Effectiveness Period,
except for any liabilities or obligations under Sections 4, 5 or 6 and the
obligations to make payments of and provide for liquidated damages under Section
2(e) to the extent such damages accrue prior to the end of the Effectiveness
Period, each of which shall remain in effect in accordance with its terms.

      [Remainder of this page intentionally left blank]


                                       19
<PAGE>

      IN WITNESS WHEREOF, the parties have executed this Registration Rights
Agreement as of the date first written above.

OMNICOM GROUP INC.

By: /s/ Randall J. Weisenburger
    --------------------------------
    Executive Vice President and
    Chief Executive Officer

Confirmed and accepted as of the date
first above written:

J.P. MORGAN SECURITIES INC.
GOLDMAN SACHS & CO.
CITIGROUP GLOBAL MARKETS INC.
ABN AMRO ROTHSCHILD LLC
HSBC SECURITIES (USA) INC.
SG COWEN SECURITIES CORP.
BARCLAYS CAPITAL INC.

By: J.P. Morgan Securities Inc.

By: /s/ Jeff Zajkowski
    --------------------------------
    Name: Jeff Zajkowski
    Title: Managing Director


                                       20