SUMMARY

     The following summary is qualified in its entirety by the more detailed information included elsewhere or incorporated by reference into this prospectus supplement and the accompanying prospectus. Because this is a summary, it may not contain all the information that may be important to you. You should read this prospectus supplement and the accompanying prospectus, as well as the information incorporated by reference, in their entirety before making an investment decision. When used in this prospectus supplement, the term “Omnicom Group” refers to Omnicom Group Inc. together with its consolidated subsidiaries, the term “Omnicom Group Inc.” refers to only Omnicom Group Inc. and not its subsidiaries, the term “Omnicom Capital” refers only to Omnicom Capital Inc., the term “Omnicom Finance” refers only to Omnicom Finance Inc. and the terms “Issuers,” “we,” “us,” and “our” refer collectively to Omnicom Group Inc., Omnicom Capital and Omnicom Finance, in each case, unless otherwise specified, as in the section captioned “Description of Notes” beginning on page S-10 of this prospectus supplement or “Description of Debt Securities” beginning on page 7 of the accompanying prospectus, or the context otherwise requires.

Omnicom Group Inc.

     Omnicom Group is a leading global marketing and corporate communications company. Omnicom Group’s branded networks and numerous specialty firms provide advertising, strategic media planning and buying, digital and interactive marketing, direct and promotional marketing, public relations and other specialty communications services to over 5,000 clients in more than 100 countries. Omnicom Group’s revenue is diversified across a number of industries. Specifically, Omnicom Group’s revenue from its 1,000 largest clients for the year ended December 31, 2009, classified by industry sector, expressed as a percentage of total revenue from these clients, is as follows: Food and Beverage: 16%, Pharmaceutical and Healthcare: 13%, Auto: 11%, Consumer Products: 11%, Technology: 10%, Telecom: 9%, Financial Services: 9%, Travel and Entertainment: 6%, Retail: 6% and Other: 9%.

     Omnicom Group’s agencies, which operate in all major markets around the world, provide a comprehensive range of services in four fundamental disciplines: traditional media advertising; customer relationship management, or CRM; public relations; and specialty communications. The services included in these categories are:

	advertising	marketing research
	brand consultancy	media planning and buying
	corporate social responsibility consulting	mobile marketing services
	crisis communications	multi-cultural marketing
	custom publishing	non-profit marketing
	database management	organizational communications
	digital and interactive marketing	package design
	direct marketing	product placement
	entertainment marketing	promotional marketing
	environmental design	public affairs
	experiential marketing	public relations
	field marketing	recruitment communications
	financial / corporate business-to-business advertising	reputation consulting
	graphic arts	retail marketing
	healthcare communications	search engine marketing
	instore design	sports and event marketing
	investor relations

     Omnicom Group Inc. is incorporated in New York and is a holding company. Its principal corporate offices are located at 437 Madison Avenue, New York, NY 10022 and One East Weaver Street, Greenwich, CT 06831, and its telephone numbers are (212) 415-3600 and (203) 618-1500, respectively.

     Omnicom Group Inc.’s common stock is traded on the New York Stock Exchange under the symbol “OMC.” For additional information regarding Omnicom Group’s business, see the Annual Report on Form 10-K for the year ended December 31, 2009, or the 2009 10-K, and other SEC filings made by Omnicom Group Inc., which are incorporated by reference into this prospectus supplement. Copies of these filings may be obtained as described under “Where You Can Find More Information; Incorporation by Reference” on page S-22 of this prospectus supplement.

Omnicom Capital Inc. and Omnicom Finance Inc.

     Omnicom Capital and Omnicom Finance are wholly owned direct subsidiaries of Omnicom Group Inc. Neither Omnicom Capital nor Omnicom Finance has any independent operations or subsidiaries. The sole function of both Omnicom Capital and Omnicom Finance is to provide funding for the operations of Omnicom Group Inc. and its operating subsidiaries by incurring debt and lending the proceeds to the operating subsidiaries. Their respective assets consist of the intercompany loans they make or have made to Omnicom Group Inc.’s operating subsidiaries and the related interest receivables.

     Omnicom Capital is incorporated in Connecticut. Its principal office is located at One East Weaver Street, Greenwich, CT 06831 and its telephone number is (203) 625-3000. Omnicom Finance is incorporated in Delaware. Its principal office is located at 437 Madison Avenue, New York, New York 10022 and its telephone number is (212) 415-3600.

THE OFFERING

     The summary below describes the principal terms of the notes. Some of the terms and conditions described below are subject to important limitations and exceptions. See “Description of Notes” in this prospectus supplement and “Description of Debt Securities” in the accompanying prospectus for a more detailed description of the terms and conditions of the notes.

Issuer	Omnicom Group Inc.
Co-Obligors	Omnicom Capital and Omnicom Finance, both wholly owned subsidiaries of Omnicom Group Inc., will also be jointly and severally liable. Omnicom Group Inc. will guarantee the obligations of Omnicom Capital and Omnicom Finance.
Notes Offered	$1,000,000,000 aggregate principal amount of 4.450% Senior Notes due 2020.
Maturity	The notes will mature on August 15, 2020.
Interest Rate	The notes will bear interest from August 5, 2010 at a rate equal to 4.450% per year, payable semiannually.
Interest Payment Dates	February 15 and August 15 of each year, commencing February 15, 2011.
Ranking	The notes will be the joint and several unsecured and unsubordinated obligations of Omnicom Group Inc., Omnicom Capital and Omnicom Finance and will rank equal in right of payment to all of their respective existing and future unsecured senior indebtedness. The notes will effectively rank junior to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness. The notes may effectively rank junior to all liabilities of our operating subsidiaries depending on the amount of loans to the operating subsidiaries and security for those loans on a relevant determination date. See “Risk Factors — Omnicom Group Inc.’s Holding Company Structure May Result in Structural Subordination and May Affect the Issuers’ Ability to Make Payments on the Notes.” As of June 30, 2010, the operating subsidiaries of Omnicom Group Inc. had approximately $8.7 billion of outstanding liabilities, including trade payables but excluding intercompany liabilities and deferred revenue.
Denominations	The notes will be issued in denominations of $2,000 and integral multiples of $1,000 in excess thereof.
Optional Redemption	The Issuers may redeem the notes, in whole or in part, at any time or from time to time, at the redemption price set forth in the accompanying prospectus under the heading “Description of Notes — Optional Redemption” on page S-11 of this prospectus supplement and page 9 of the accompanying prospectus, plus a make whole spread of 25 basis points.
Certain Covenants	The indenture governing the notes contains covenants limiting our and our subsidiaries’ ability to, with certain exceptions: create certain liens; and consolidate or merge with, or convey, transfer or lease substantially all our assets to, another person.

	You should read “Description of Notes” on page S-10 in this prospectus supplement and “Description of Debt Securities” on page 7 of the accompanying prospectus for additional information on these covenants.
Use of Proceeds	The net proceeds we receive from the sale of the notes, after deducting the underwriting discount and estimated offering expenses payable by us, will be approximately $988.7 million. We intend to use the net proceeds from the sale of the notes for general corporate purposes, which could include working capital expenditures, fixed asset expenditures, acquisitions, refinancing of other debt, repurchases of our common stock or other capital transactions.
Risk Factors	See “Risk Factors” beginning on page S-5 of this prospectus supplement and the section entitled “Item 1A. Risk Factors” in Omnicom Group Inc.’s 2009 10-K for important information regarding us and an investment in the notes.
Further Issuances	We will have the ability to “reopen” the notes offered hereby and issue additional notes of that series having the same terms, except with respect to the payment of interest accruing prior to the issue date of such further notes or except for the first payment of interest following the issue date of such further notes.
Governing Law	The indenture will be governed by, and construed in accordance with, the laws of the State of New York.

PROSPECTUS

OMNICOM GROUP INC.	OMNICOM GROUP INC.
OMNICOM CAPITAL INC.
OMNICOM FINANCE INC.
DEBT SECURITIES	COMMON STOCK
	PREFERRED STOCK
	GUARANTEES OF DEBT SECURITIES
	SUBSCRIPTION RIGHTS
	WARRANTS

     Pursuant to this prospectus, Omnicom Group Inc., Omnicom Capital Inc. and Omnicom Finance Inc., as co-obligors, may offer from time to time senior or subordinated debt securities (together with guarantees by Omnicom Group Inc. of Omnicom Capital Inc.’s and Omnicom Finance Inc.’s obligations in respect of any such debt securities) and Omnicom Group Inc. may offer from time to time:

• shares of its common stock, par value $.15 per share;

• shares of its preferred stock, par value $1.00 per share;

• subscription rights to purchase its common stock, preferred stock or warrants; and

• warrants to purchase shares of Omnicom Group Inc. common stock or preferred stock.

     Specific terms of these securities will be provided in supplements to this prospectus. The securities may be offered separately or together in any combination and as separate series. You should read this prospectus and any prospectus supplement carefully before you invest.

     Omnicom Group Inc.’s common stock is listed on the New York Stock Exchange and trades under the symbol “OMC.”

     Investing in these securities involves certain risks. See the information included and incorporated by reference in this prospectus and the accompanying prospectus supplement for a discussion of the factors you should carefully consider before deciding to purchase these securities, including the information under “Risk Factors” in Omnicom Group Inc.’s most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission.

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     Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

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     We may sell these securities on a continuous or delayed basis directly, through agents, dealers or underwriters as designated from time to time, or through a combination of these methods. We reserve the sole right to accept, and together with any agents, dealers and underwriters, reserve the right to reject, in whole or in part, any proposed purchase of securities. If any agents, dealers or underwriters are involved in the sale of any securities, the applicable prospectus supplement will set forth any applicable commissions or discounts. Our net proceeds from the sale of securities also will be set forth in the applicable prospectus supplement.

The date of this prospectus is March 18, 2009

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     You should rely only on the information contained in or incorporated by reference in this prospectus, in any accompanying prospectus supplement or in any free writing prospectus filed by us with the Securities and Exchange Commission (the “SEC”) and any information about the terms of securities offered conveyed to you by us, our underwriters or our agents. We have not authorized anyone to provide you with different information. We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information contained in or incorporated by reference in this prospectus or any prospectus supplement or in any such free writing prospectus is accurate as of any date other than their respective dates.

TABLE OF CONTENTS

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	Page
The Company	1
About This Prospectus	2
Where You Can Find More Information; Incorporation By Reference	2
Special Note on Forward-Looking Statements	3
Use of Proceeds	3
Ratio of Earnings to Fixed Charges	4
Description of Omnicom Group Inc. Common Stock	4
Description of Omnicom Group Inc. Preferred Stock	4
Description of Debt Securities	7
Description of Omnicom Group Inc. Subscription Rights	13
Description of Omnicom Group Inc. Warrants	14
Plan of Distribution	15
Validity of Securities	15
Independent Registered Public Accounting Firm	15

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THE COMPANY

     When used in this prospectus, the term “Omnicom Group” refers to Omnicom Group Inc. together with its consolidated subsidiaries, the term “Omnicom Group Inc.” refers only to Omnicom Group Inc. and not its subsidiaries, the term “Omnicom Capital” refers only to Omnicom Capital Inc., the term “Omnicom Finance” refers only to Omnicom Finance Inc., and the terms, “Issuers,” “we,” “us” and “our” refer collectively to Omnicom Group Inc., Omnicom Capital and Omnicom Finance, in each case, unless otherwise specified.

Omnicom Group Inc.

     Omnicom Group is a leading global marketing and corporate communications company. Omnicom Group’s branded networks and numerous specialty firms provide advertising, strategic media planning and buying, digital and interactive marketing, direct and promotional marketing, public relations and other specialty communications services to over 5,000 clients in more than 100 countries.

     Omnicom Group’s agencies, which operate in all major markets around the world, provide a comprehensive range of services in four fundamental disciplines: traditional media advertising; customer relationship management, or CRM; public relations; and specialty communications. The services included in these categories are:

	advertising	investor relations
	brand consultancy	marketing research
	corporate social responsibility consulting	media planning and buying
	crisis communications	mobile marketing services
	custom publishing	multi-cultural marketing
	database management	non-profit marketing
	digital and interactive marketing	organizational communications
	direct marketing	package design
	directory advertising	product placement
	entertainment marketing	promotional marketing
	environmental design	public affairs
	experiential marketing	public relations
	field marketing	recruitment communications
	financial / corporate business-to-business advertising	reputation consulting
	graphic arts	retail marketing
	healthcare communications	search engine marketing
	instore design	sports and event marketing

     Omnicom Group Inc. is incorporated in New York and is a holding company. Its principal corporate offices are located at 437 Madison Avenue, New York, NY 10022 and One East Weaver Street, Greenwich, CT 06831, and its telephone numbers are (212) 415-3600 and (203) 618-1500, respectively.

Omnicom Capital Inc. and Omnicom Finance Inc.

     Omnicom Capital and Omnicom Finance are wholly owned direct subsidiaries of Omnicom Group Inc. Neither Omnicom Capital nor Omnicom Finance has any independent operations or subsidiaries. The sole function of both Omnicom Capital and Omnicom Finance is to provide funding for the operations of Omnicom Group Inc. and its operating subsidiaries by incurring debt and lending the proceeds to the operating subsidiaries. Their respective assets consist of the intercompany loans they make or have made to Omnicom Group Inc.’s operating subsidiaries and the related interest receivables.

     Omnicom Capital is incorporated in Connecticut. Its principal office is located at One East Weaver Street, Greenwich, CT 06831 and its telephone number is (203) 625-3000. Omnicom Finance is incorporated in Delaware. Its principal office is located at 437 Madison Avenue, New York, New York 10022 and its telephone number is (212) 415-3600.

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ABOUT THIS PROSPECTUS

     This prospectus is part of a registration statement that we filed with the SEC utilizing a “shelf” registration process. Under this shelf process, we may sell any combination of the securities described in this prospectus in one or more offerings. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement will describe: the terms of the securities offered, any initial public offering price, the price paid to us for the securities, the net proceeds to us, the manner of distribution and any underwriting compensation and the other specific material terms related to the offering of the applicable securities. For more detail on the terms of the securities, you should read the exhibits filed with or incorporated by reference in our registration statement of which this prospectus forms a part. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”

     This prospectus contains summaries of certain provisions contained in some of the documents described herein. Please refer to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of the documents referred to herein have been filed, or will be filed or incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under “Where You Can Find More Information.”

     Pursuant to this registration statement Omnicom Group Inc. may offer, issue and sell securities as set forth on the cover page of this prospectus. Because Omnicom Group Inc. is a “well-known seasoned issuer,” as defined in Rule 405 of the Securities Act of 1933, as amended, which we refer to in this prospectus as the “Securities Act,” Omnicom Group Inc. may add to and offer additional securities, including securities held by security holders, by filing a prospectus supplement with the SEC at the time of the offer. In addition, Omnicom Group Inc. is able to add its subsidiaries and securities to be issued by them if Omnicom Group Inc. guarantees such securities. Omnicom Group Inc. will guarantee any debt securities that Omnicom Capital and Omnicom Finance issued under this prospectus.

WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE

     This prospectus is a part of a registration statement filed by Omnicom Group Inc., Omnicom Capital, and Omnicom Finance under the Securities Act. The registration statement also includes additional information not contained in this prospectus.

     Omnicom Group Inc. files annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copy any document Omnicom Group Inc. files at the SEC’s public reference rooms at 100 F Street N.E., Washington, D.C. 20549. You can also request copies of the documents, upon payment of a duplicating fee, by writing the Public Reference Section of the SEC. Please call the SEC at 1-800-SEC-0330 for further information on the public reference rooms. These SEC filings are also available to the public from the SEC’s web site at http://www.sec.gov.

     The SEC allows us to “incorporate by reference” into this prospectus and any prospectus supplement (as well as the related registration statement) the information we file with the SEC, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus as a legal matter. Information that we file later with the SEC will automatically update information in this prospectus. In all cases, you should rely on the later information over different information included in this prospectus or the prospectus supplement. We incorporate by reference the documents listed below and any future filings made with the SEC under Section 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934:

• Annual report of Omnicom Group Inc. on Form 10-K for the fiscal year ended December 31, 2008 filed with the SEC on February 27, 2009;

• Definitive proxy statement of Omnicom Group Inc. on Schedule 14A filed with the SEC on April 4, 2008;

• Current reports of Omnicom Group Inc. on Form 8-K filed with the SEC on January 23, 2009 and February 10, 2009 (except for the information furnished pursuant to Items 2.02 and 7.01 of Form 8-K and the furnished exhibit relating to that information); and

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• Registration Statement on Form 8-A filed pursuant to Section 12 of the Exchange Act describing Omnicom Group Inc.’s common stock, including any amendments or reports filed for the purpose of updating such description.

     All documents we file pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus and before the later of (1) the completion of the offering of the securities described in this prospectus and (2) if applicable, the date any underwriters stop offering securities pursuant to this prospectus will also be incorporated by reference in this prospectus from the date of filing of such documents. Upon request, we will provide to each person, including any beneficial owner, to whom a prospectus is delivered, a copy of any or all of the information that has been incorporated by reference in this prospectus but not delivered with this prospectus.

     This information is also available on the investor relations page of Omnicom Group Inc.’s web site at http://www.omnicomgroup.com. Information included or available through Omnicom Group Inc.’s website does not constitute a part of this prospectus or any prospectus supplement. You may also request a copy of these filings, at no cost, by writing or telephoning Omnicom Group Inc. at the following address:

Omnicom Group Inc.
437 Madison Avenue
New York, NY 10022
Attn: Corporate Secretary
(212) 415-3600

     You should rely only on the information provided in this prospectus and any prospectus supplement, as well as the information incorporated by reference. We have not authorized anyone to provide you with different information. You should not assume that the information in this prospectus, the prospectus supplement or any documents incorporated by reference is accurate as of any date other than the date on the front of the applicable document.

SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS

     Certain of the statements in this prospectus constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, from time to time, we or our representatives have made or may make forward-looking statements, orally or in writing. These statements relate to future events or future financial performance and involve known and unknown risks and other factors that may cause our actual or our industry’s results, levels of activity or achievement to be materially different from those expressed or implied by any forward-looking statements. These risks and uncertainties, including those resulting from specific factors identified under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K, include, but are not limited to, our future financial condition and results of operations, the continuing global economic recession and credit crisis, losses on media purchases on behalf of clients, reductions in client spending and/or a slowdown in client payments, competitive factors, changes in client communication requirements, the hiring and retention of personnel, our ability to attract new clients and retain existing clients, changes in government regulations impacting our advertising and marketing strategies, risks associated with assumptions we make in connection with our critical accounting estimates, legal proceedings, settlements, investigations and claims, and our international operations, which are subject to the risks of currency fluctuations and exchange controls. In some cases, forward-looking statements can be identified by terminology such as “may,” “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of those terms or other comparable terminology. These statements are our present expectations. Actual events or results may differ. We undertake no obligation to update or revise any forward-looking statement, except as required by law.

USE OF PROCEEDS

     Unless otherwise specified in an applicable prospectus supplement, Omnicom Group will use the proceeds it receives from the sale of the offered securities for general corporate purposes, which could include working capital, capital expenditures, acquisitions, refinancing of other debt or other capital transactions. Net proceeds may be temporarily invested prior to use. The precise amounts and timing of the application of proceeds will depend upon the funding requirements of Omnicom Group Inc. and its subsidiaries at the time of issuance and the availability of other funds.

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RATIO OF EARNINGS TO FIXED CHARGES

     The following table shows the ratio of earnings to fixed charges of Omnicom Group Inc. for each of the five most recent fiscal years.

Year Ended
December 31, 2008		December 31, 2007		December 31, 2006		December 31, 2005		December 31, 2004
6.70x		6.93x		6.02x		6.50x		6.62x

     The ratio of earnings to fixed charges is computed by dividing fixed charges into income before income taxes plus dividends from affiliates and fixed charges. Fixed charges consist of interest expense and that portion of net rental expense deemed representative of interest.

     Since we had no preferred stock outstanding during any of the periods presented, the ratios of earnings to fixed charges and the ratios of earnings to combined fixed charges and preferred dividends are the same.

DESCRIPTION OF OMNICOM GROUP INC. COMMON STOCK

General

     The following briefly summarizes the material terms of Omnicom Group Inc.’s common stock. You should read the more detailed provisions of Omnicom Group Inc.’s restated certificate of incorporation for provisions that may be important to you.

     Omnicom Group Inc.’s restated certificate of incorporation authorizes it to issue up to 1,000,000,000 shares of common stock, par value $.15 per share. As of February 12, 2009, Omnicom Group Inc. had approximately 310,932,000 shares of its common stock outstanding.

     Each holder of common stock is entitled to one vote per share for the election of directors and for all other matters to be voted on by Omnicom Group Inc. shareholders. Holders of common stock may not cumulate their votes in the election of directors, and are entitled to share equally in the dividends that may be declared by the board of directors, but only after payment of dividends required to be paid on any outstanding shares of preferred stock.

     Omnicom Group Inc.’s shareholders elect the full board of directors annually and may not remove a director except by an affirmative two-thirds vote of all outstanding voting shares. A two-thirds vote of all outstanding voting shares is also required for Omnicom Group Inc.’s shareholders to amend Omnicom Group Inc.’s by-laws or certain provisions of its restated certificate of incorporation, and to change the number of directors comprising the full board. The board of directors also has power to amend the by-laws or change the number of directors comprising the full board.

     Upon voluntary or involuntary liquidation, dissolution or winding up of Omnicom Group Inc., the holders of the common stock share ratably in the assets remaining after payments to creditors and provision for the preference of any preferred stock. There are currently no preemptive or other subscription rights, conversion rights or redemption or scheduled installment payment provisions relating to shares of common stock. All of the outstanding shares of common stock are fully paid and nonassessable.

Transfer Agent and Registrar

The transfer agent and registrar for the common stock is Wells Fargo Bank, N.A.

Listing

The common stock is listed on the New York Stock Exchange under the symbol “OMC.”

DESCRIPTION OF OMNICOM GROUP INC. PREFERRED STOCK

     The following briefly summarizes the material terms of Omnicom Group Inc.’s preferred stock, other than pricing and related terms to be disclosed in a prospectus supplement. You should read the particular terms of any series of preferred stock offered by Omnicom Group Inc. which will be described in more detail in any prospectus supplement relating to such series, together with the more detailed provisions of Omnicom Group Inc.’s restated certificate of

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incorporation and the certificate of designation relating to each particular series of preferred stock, for provisions that may be important to you. The restated certificate of incorporation is incorporated by reference as an exhibit to the registration statement of which this prospectus forms a part. The certificate of designation relating to the particular series of preferred stock offered by a prospectus supplement relating to the series’ issue will be filed as an exhibit to one of Omnicom Group Inc.’s future current reports and incorporated by reference in the registration statement to which this prospectus relates. The prospectus supplement will also state whether any of the terms summarized below do not apply to the series of preferred stock being offered.

General

     As of the date of this prospectus, Omnicom Group Inc. is authorized to issue up to 7.5 million shares of preferred stock, par value $1.00 per share, none of which is outstanding.

     Under Omnicom Group Inc.’s restated certificate of incorporation, the board of directors of Omnicom Group Inc. is authorized to issue, without the approval of Omnicom Group Inc.’s shareholders, shares of preferred stock in one or more series, and to establish from time to time a series of preferred stock having such powers, preferences, rights and limitations as the board of directors so designates.

     Prior to the issuance of any series of preferred stock, the board of directors of Omnicom Group Inc. will adopt resolutions creating and designating the series as a series of preferred stock and the resolutions will be filed with the New York State Secretary of State as an amendment to the restated certificate of incorporation.

     The resolutions of the board of directors of Omnicom Group Inc. providing for a series of preferred stock may include the following provisions:

• the title and stated value of the preferred stock;

• the number of shares of the preferred stock offered, the liquidation preference per share and the purchase price of the preferred stock;

• the dividend rate, period and/or payment date or method of calculation thereof applicable to the preferred stock;

• whether dividends shall be cumulative or non-cumulative and, if cumulative, the date from which dividends on the preferred stock shall accumulate;

• the provisions for a sinking fund, if any, for the preferred stock;

• the provisions for redemption, if applicable, of the preferred stock;

• the terms and conditions, if applicable, upon which the preferred stock will be convertible into or exchangeable for other types of securities, including the conversion price (or a manner of calculation thereof) and conversion period;

• voting rights, if any, of the preferred stock;

• whether interests in the preferred stock will be represented by depositary shares; and

• any other specific terms, preferences, rights, limitations or restrictions of the preferred stock.

     The rights of holders of the preferred stock offered may be affected by the rights of holders of any shares of preferred stock that may be issued in the future. Those effects could be adverse. Shares of preferred stock issued by Omnicom Group Inc. may have the effect of rendering more difficult or discouraging an acquisition of Omnicom Group Inc. deemed undesirable by the board of directors of Omnicom Group Inc.

     The preferred stock will be, when issued, fully paid and nonassessable. Holders of preferred stock will not have any preemptive or subscription rights to acquire more stock of Omnicom Group Inc.

     The transfer agent, registrar, dividend disbursing agent and redemption agent for shares of each series of preferred stock will be named in the prospectus supplement relating to such series.

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Rank

     Unless otherwise specified in the prospectus supplement relating to the shares of any series of preferred stock, the shares will rank on an equal basis with each other series of preferred stock and prior to the common stock as to dividends and distributions of assets.

Dividends

     Holders of each series of preferred stock will be entitled to receive cash dividends when, as and if declared by the board of directors of Omnicom Group Inc. out of funds legally available for dividends. The rates and dates of payment of dividends will be set forth in the prospectus supplement relating to each series of preferred stock. Dividends will be payable to holders of record of preferred stock as they appear on the books of Omnicom Group Inc. on the record dates fixed by the board of directors. Dividends on any series of preferred stock may be cumulative or noncumulative.

Conversion and Exchange

     The prospectus supplement for any series of preferred stock will state the terms, if any, on which shares of that series are convertible into or exchangeable for other types of securities of Omnicom Group Inc.

Redemption

     If so specified in the applicable prospectus supplement, a series of preferred stock may be redeemable at any time, in whole or in part, at the option of Omnicom Group Inc. or the holder thereof and may be mandatorily redeemed.

     Any partial redemptions of preferred stock will be made in a way that the board of directors decides is equitable.

     Unless Omnicom Group Inc. defaults in the payment of the redemption price, dividends will cease to accrue after the redemption date on shares of preferred stock called for redemption and all rights of holders of such shares will terminate except for the right to receive the redemption price.

Liquidation Preference

     Upon any voluntary or involuntary liquidation, dissolution or winding up of Omnicom Group Inc., holders of each series of preferred stock will be entitled to receive distributions upon liquidation in the amount set forth in the prospectus supplement relating to such series of preferred stock, plus an amount equal to any accrued and unpaid dividends. Those distributions will be made before any distribution is made on any securities ranking junior relating to liquidation, including common stock.

     If the liquidation amounts payable relating to the preferred stock of any series and any other securities ranking on a parity regarding liquidation rights are not paid in full, the holders of the preferred stock of such series and such other securities will share in any such distribution of available assets of Omnicom Group Inc. on a ratable basis in proportion to the full liquidation preferences.

     Holders of preferred stock will not be entitled to any other amounts from Omnicom Group Inc. after they have received their full liquidation preference.

Voting Rights

     The holders of shares of preferred stock will have no voting rights, except:

• as otherwise stated in the prospectus supplement;

• as otherwise stated in the certificate of designation establishing such series; or

• as required by applicable law.

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DESCRIPTION OF DEBT SECURITIES

General

     The description below of the general terms of the debt securities will be supplemented by the more specific terms of a particular series in a prospectus supplement.

     The debt securities offered by this prospectus will be joint and several unsecured obligations of Omnicom Group Inc., Omnicom Capital and/or Omnicom Finance and will be either senior or subordinated debt. We will issue the debt securities under an indenture between us and Deutsche Bank Trust Company Americas (the “Trustee”). The indenture provides that our debt securities may be issued in one or more series, with different terms, in each case as authorized from time to time by us. The indenture also gives us the ability to reopen a previous issue of a series of debt securities and issue additional debt securities of that series or establish additional terms for that series of debt securities. The indenture does not limit the amount of debt securities or other unsecured debt which we may issue.

     Neither the senior debt securities nor the subordinated debt securities will be secured by any of our property or assets. Thus, by owning a debt security, you are one of our unsecured creditors.

     In addition to the following description of the debt securities, you should refer to the detailed provisions of the indenture, a copy of which is filed as an exhibit to the registration statement.

     If material, federal income tax consequences and other special considerations applicable to any debt securities issued by the Issuers at a discount will be described in the applicable prospectus supplement.

     The debt securities will represent direct, unsecured, general obligations of the Issuers and:

• may rank equally with other unsubordinated debt or may be subordinated to other debt the Issuers has or may incur;

• may be issued in one or more series with the same or various maturities;

• may be issued at a price of 100% of their principal amount or at a premium or discount; and

• may be represented by one or more global notes registered in the name of a designated depositary’s nominee, and if so, beneficial interests in the global note will be shown on and transfers will be made only through records maintained by the designated depositary and its participants.

     Omnicom Group Inc. is a holding company and Omnicom Capital and Omnicom Finance are finance subsidiaries. As finance subsidiaries, Omnicom Capital’s and Omnicom Financial’s respective assets consist of the intercompany loans they make or have made to Omnicom Group Inc.’s operating subsidiaries and the related interest receivables. As a result, the debt securities issued under the indenture will effectively be subordinated to all existing and future obligations of Omnicom Group Inc.’s operating subsidiaries, including trade payables, and to the Issuers’ respective obligations that are secured, to the extent of the security. Omnicom Capital’s and Omnicom Finance’s obligations in respect of any debt securities will be guaranteed by Omnicom Group Inc.

     The aggregate principal amount of debt securities that the Issuers may authenticate and deliver is unlimited. You should refer to the applicable prospectus supplement for the following terms of the debt securities of the series with respect to which that prospectus supplement is being delivered:

• the title of the debt securities;

• ranking of the specific series of debt securities relative to other outstanding indebtedness, including subsidiaries’ debt;

• whether the debt securities will be senior or subordinated debt;

• if the debt securities are subordinated, the aggregate amount of outstanding indebtedness, as of a recent date, that is senior to the subordinated securities, and any limitation on the issuance of additional senior indebtedness;

• the percentage of the principal amount at which the debt securities will be sold and, if applicable, the method of determining the price;

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• any limit on the aggregate principal amount of the debt securities;

• the maturity date or dates;

• the interest rate;

• the manner in which the amounts of payment of principal of or interest, if any, on the securities of the series will be determined, if such amounts may be determined by reference to an index based on a currency or currencies or by reference to a commodity, commodity index, stock exchange index or financial index;

• the date or dates from which any interest will accrue, or how such date or dates will be determined, and the interest payment date or dates and any related record dates;

• the location where payments on the debt securities will be made;

• the terms and conditions on which the debt securities may be redeemed at the option of the Issuers;

• the terms and conditions on which the debt securities mat be repurchased by the Issuers at the option of the holders thereof;

• any obligation of the Issuers to redeem or purchase the debt securities pursuant to sinking fund provisions;

• any obligation of the Issuers to redeem, purchase or repay the debt securities at the option of a holder upon the happening of any event and the terms and conditions of redemption, purchase or repayment;

• if other than denominations of $1,000, the denominations in which debt securities may be issued;

• whether the debt securities will be issuable as global securities;

• if other than the principal amount, the portion of the principal amount of the debt securities payable if the maturity is accelerated;

• the provisions relating to any security provided for the debt securities;

• any events of default not described in “Events of Default” below;

• the terms and conditions on which the debt securities may be exchanged or converted into common stock or preferred stock of Omnicom Group Inc.;

• the form and terms of any guarantee of or security for the debt securities;

• any depositaries, interest rate calculation agents or other agents;

• any material provisions of the indenture described in this prospectus that do not apply to the debt securities; and

• any other terms of the debt securities not inconsistent with the provisions of the applicable indenture.

     The terms on which a series of debt securities may be convertible into or exchangeable for common stock or preferred stock of Omnicom Group Inc. will be set forth in the prospectus supplement relating to such series. Such terms will include provisions as to whether conversion or exchange is mandatory, at the option of the holder or at the option of the Issuers. The terms may include provisions pursuant to which the number of shares of common stock or other securities of Omnicom Group Inc. to be received by the holders of such series of debt securities may be adjusted.

     The debt securities will be issued only in registered form. Debt securities of a series will either be global securities registered in book-entry form, or a physical (paper) certificate issued in definitive, or certificated, registered form. Procedures relating to global securities are described below under “Book-Entry Procedures and Settlement.” Unless otherwise provided in the applicable prospectus supplement, debt securities denominated in United States dollars will be issued only in denominations of $1,000 and whole multiples of $1,000. The prospectus supplement relating to offered securities denominated in a foreign or composite currency will specify the denomination of the offered securities.

     Debt securities represented by a paper certificate may be presented for exchange or transfer at the office of the Registrar. Holders will not have to pay any service charge for any registration of transfer or exchange of their

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certificates, but the Issuers may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection with such registration of transfer.

Payment and Paying Agents

     Distributions on the debt securities other than those represented by global notes will be made in the designated currency against surrender of the debt securities at the principal office of the paying agent. Payment will be made to the registered holder at the close of business on the record date for such payment. Interest payments will be made at the principal corporate trust office of the trustee in New York City, or by a check mailed to the holder at his registered address. Payments in any other manner will be specified in the prospectus supplement.

Book-Entry Procedures and Settlement

     The debt securities will be issued in book-entry form only and represented by one or more global securities registered in the name of, and deposited with a custodian for, The Depository Trust Company, or DTC, or its nominee. DTC or its nominee will be the sole registered holder of the debt securities for all purposes under the indenture. Owners of beneficial interests in the debt securities represented by the global securities will hold their interests pursuant to the procedures and practices of DTC. As a result, beneficial interests in these securities will be shown on, and may only be transferred through, records maintained by DTC and its direct and indirect participants and any such interest may not be exchanged for certificated securities, except in limited circumstances. Owners of beneficial interests must exercise any rights in respect of their interests, in accordance with the procedures and practices of DTC. Beneficial owners will not be holders and will not be entitled to any rights provided to the holders of debt securities under the global securities or the indenture. The Issuers and the trustee, and any of their respective agents, may treat DTC as the sole holder and registered owner of the global securities under the terms of the indenture.

Optional Redemption

     Unless an applicable prospectus supplement specifies otherwise, the debt securities will not be redeemable. In the event the debt securities are redeemable, the debt securities will be redeemable, as a whole or in part, at the Issuers’ option, at any time or from time to time, upon mailed notice to the registered address of each holder of debt securities at least 30 days but not more than 60 days prior to the redemption. The redemption price will be equal to the greater of (1) 100% of the principal amount of the debt securities to be redeemed and (2) the sum of the present values of the Remaining Scheduled Payments (as defined below) on such debt securities discounted to the date of redemption, on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months), at a rate equal to the sum of the applicable Treasury Rate (as defined below) plus a make whole spread, which will be specified in the applicable prospectus supplement, plus accrued and unpaid interest thereon to the redemption date.

     “Treasury Rate” means, with respect to any redemption date, the rate per annum equal to the semiannual equivalent yield to maturity (computed as of the third business day immediately preceding that redemption date) of the Comparable Treasury Issue (as defined below), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for that redemption date.

     “Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer (as defined below) as having a maturity comparable to the remaining term of the debt securities, that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the debt securities.

     “Comparable Treasury Price” means, with respect to any redemption date, the Reference Treasury Dealer Quotations (as defined below) for that redemption date.

     “Reference Treasury Dealer” means each of any three primary U.S. Government securities dealer selected by us, and their respective successors.

     “Reference Treasury Dealer Quotations” means, with respect to the Reference Treasury Dealer and any redemption date, the average, as determined by the trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the trustee by the Reference Treasury Dealer at 3:30 p.m., New York City time, on the third business day preceding that redemption date.

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     “Remaining Scheduled Payments” means the remaining scheduled payments of principal of and interest on the debt securities that would be due after the related redemption date but for that redemption. If that redemption date is not an interest payment date with respect to the debt securities, the amount of the next succeeding scheduled interest payment on the debt securities will be reduced by the amount of interest accrued on the debt securities to such redemption date. On and after the redemption date, interest will cease to accrue on the debt securities or any portion of the debt securities called for redemption (unless we default in the payment of the redemption price and accrued interest). On or before the redemption date, we will deposit with a paying agent (or the trustee) money sufficient to pay the redemption price of and accrued interest on the debt securities to be redeemed on that date. If less than all of the debt securities are to be redeemed, the debt securities to be redeemed shall be selected by the trustee by a method the trustee deems to be fair and appropriate.

Consolidation, Merger or Sale

     The Issuers may not consolidate with or merge into, or convey, transfer or lease their respective properties and assets as an entirety or substantially as an entirety to, any person, referred to as a “successor person,” except in the case of Omnicom Capital and Omnicom Finance with, into or to Omnicom Group Inc., each other or any other subsidiary of Omnicom Group Inc., unless:

• either (a) an Issuer is the continuing person or (b) the resulting, surviving or transferee person is an entity organized under the laws of the United States;

• the successor person expressly assumes the respective Issuer’s obligations with respect to the debt securities and the indenture;

• immediately after giving effect to the transaction, no event of default, and no event which, after notice or lapse of time or both, would become an event of default, shall have occurred and be continuing; and

• the respective Issuer or the successor person has delivered to the trustee the certificates and opinions required under the indenture.

Modification of the Indenture

     Under the indenture, the Issuers and the trustee may enter into supplemental indentures without obtaining the consent of any holder of debt securities:

• to cure any ambiguity, defect or inconsistency;

• to comply with the indenture’s provisions regarding successor corporations;

• to comply with any requirements of the SEC in connection with the qualification of the indenture under the Trust Indenture Act;

• to provide for global securities in addition to or in place of certificated debt securities;

• to add to, change or eliminate any of the provisions of the indenture with respect to any series of debt securities; although no such addition, change or elimination may apply to any series of debt security created prior to the execution of such amendment and entitled to the benefit of such provision, nor may any such amendment modify the rights of a holder of any such debt security with respect to such provision, unless the amendment becomes effective only when there is no outstanding debt security of any series created prior to such amendment and entitled to the benefit of such provision;

• in the case of subordinated debt securities, to make any change in the provisions of the indenture relating to subordination that would limit or terminate the benefits available to any holder of senior indebtedness under such provisions (but only if each such holder of senior indebtedness consents to such change);

• to make any change that does not materially adversely affect in any material respect the legal rights of any holder; or

• to establish additional series of debt securities as permitted by the indenture.

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     The Issuers and the trustee may, with the consent of the holders of at least a majority in aggregate principal amount of the debt securities of a series, modify the indenture or the rights of the holders of the securities of the series to be affected. No modifications may, without the consent of the holder of each security affected, be made that, as to any non-consenting holders:

• reduce the percentage of securities whose holders need to consent to the modification;

• reduce the rate or change the time of payment of interest on the securities;

• reduce the principal amount of or the premium, if any, on the securities;

• change the fixed maturity of any of the securities;

• reduce the amount of, or postpone the date fixed for, the payment of any sinking fund;

• reduce the principal amount payable upon acceleration of the maturity of any securities issued originally at a discount;

• in the case of any subordinated debt security or coupons appertaining thereto, make any change in the provisions of the indenture relating to subordination that adversely affects the rights of any holder under such provisions;

• waive a default in the payment of the principal amount of, the premium, if any, or any interest on the securities;

• change the currency in which any of the securities are payable;

• impair the right to sue for the enforcement of any payment on or after the maturity of the securities; or

• waive a redemption payment with respect to the securities.

Events of Default

     The indenture provides that events of default regarding any series of debt securities will be:

• failure to pay required interest on any debt security of such series for 30 days;

• failure to pay principal, other than a scheduled installment payment, or premium, if any, on any debt security of the series when due;

• failure to make any required deposit of any sinking fund payment when due;

• failure to perform for 60 days after notice any other covenant in the applicable indenture (other than a covenant included in the applicable indenture solely for the benefit of a series of debt securities other than such series);

• (A) the Issuers’ failure to make any payment by the end of any applicable grace period after maturity of their respective indebtedness, which term as used in the applicable indenture means obligations (other than nonrecourse obligations) of the Issuers for borrowed money or evidenced by bonds, debentures, notes or similar instruments in an amount (taken together with amounts in (B)) in excess of $100 million and continuance of such failure, or (B) the acceleration of their respective indebtedness in an amount (taken together with the amounts in (A)) in excess of $100 million because of a default with respect to such indebtedness without such indebtedness having been discharged or such acceleration having been cured, waived, rescinded or annulled in case of (A) or (B) above, for a period of 30 days after written notice to the Issuers by the trustee or to the Issuers and the trustee by the holders of not less than 25% in aggregate principal amount of the notes then outstanding; however, if any such failure or acceleration referred to in (A) or (B) above shall cease or be cured or be waived, rescinded or annulled in accordance with the terms of the applicable debt security, then the event of default by reason thereof shall be deemed not to have occurred;

• certain events of bankruptcy or insolvency, whether voluntary or not; or

• any other event of default described in the prospectus supplement of such series of debt securities.

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     If an event of default (other than the bankruptcy provision) regarding debt securities of any series issued under the indenture should occur and be continuing, either the trustee or the holders of 25% in the principal amount of outstanding debt securities of such series may declare each debt security of that series due and payable. If a bankruptcy event occurs, the principal of and accrued and unpaid interest on the debt securities of such series shall immediately become due and payable without any declaration or other act on the part of the trustee or the holders of the debt securities of such series. The holders of a majority in principal amount of debt securities of such series may rescind any other declaration or acceleration and its consequences if the rescission would not conflict with any judgment or decree and if all existing events of default have been cured or waived (other than nonpayment of principal or interest that has become due solely as a result of acceleration). The Issuers are required to file annually with the trustee a statement of an officer as to the fulfillment by the Issuers of their respective obligations under the applicable indenture during the preceding year.

     Holders of a majority in principal amount of the outstanding debt securities of any series will be entitled to control certain actions of the trustee under the applicable indenture. Holders of a majority in principal amount of the outstanding debt securities of any series also will be entitled to waive past defaults regarding the series, except for a default in payment of principal, premium or interest or a default in a covenant or provision which may not be modified or amended without the consent of each holder of a debt security of the affected series. The trustee generally may not be ordered or directed by any of the holders of debt securities to take any action, unless one or more of the holders shall have offered to the trustee reasonable security or indemnity.

     If an event of default occurs and is continuing regarding a series of debt securities, the trustee may use any sums that it holds under the applicable indenture for its own reasonable compensation and expenses incurred prior to paying the holders of debt securities of such series.

     Before any holder of any series of debt securities may institute action for any remedy, except payment on the holder’s debt security when due, the holders of not less than 25% in principal amount of the debt securities of that series outstanding must request the trustee to take action. Holders must also offer and give the satisfactory security and indemnity against liabilities incurred by the trustee for taking such action.

Defeasance

     The indenture provides that the Issuers may specify with respect to any series of debt securities that after the Issuers have deposited with the trustee, cash or government securities, in trust for the benefit of the holders sufficient to pay the principal of, premium, if any, and interest on and any mandatory sinking fund payments in respect of the debt securities of such series when due, then the Issuers:

• will be deemed to have paid and satisfied its obligations on all outstanding debt securities of such series, which is known as “defeasance and discharge”; or

• will cease to be under any obligation, other than to pay when due the principal of, premium, if any, and interest on and any mandatory sinking fund payments in respect of such debt securities, relating to the debt securities of such series, which is known as “covenant defeasance.”

     In each case, the Issuers must also deliver to the trustee an opinion of counsel to the effect that the holders of the debt securities of such series will have no federal income tax consequences as a result of such deposit.

     In addition, the subordinated note indenture provides that if we choose to have the defeasance and discharge provision applied to the subordinated debt securities, the subordination provisions of the subordinated note indenture will become ineffective upon full defeasance of the subordinated debt securities.

     When there is a defeasance and discharge, (1) the indenture will no longer govern the debt securities of such series, (2) the Issuers will no longer be liable for payment, and (3) the holders of the debt securities will be entitled only to the deposited funds. When there is a covenant defeasance, however, the Issuers will continue to be obligated to make payments when due if the deposited funds are not sufficient.

Subordination

     Debt securities of a series, and any guarantees, may be subordinated, which we refer to as subordinated debt securities, to senior indebtedness (as defined in the applicable prospectus supplement) to the extent set forth in the

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prospectus supplement relating thereto. To the extent we conduct operations through subsidiaries, the holders of debt securities (whether or not subordinated debt securities) will be structurally subordinated to the creditors of our subsidiaries except to the extent such subsidiary is a guarantor of such series of debt securities.

Further Issues

     The Issuers may from time to time, without notice to or the consent of the registered holders of a series of debt securities, create and issue further debt securities of any such series ranking equally with the debt securities of the corresponding series in all respects (or in all respects other than the payment of interest accruing prior to the issue date of such further debt securities or except for the first payment of interest following the issue date of such further debt securities). Such further debt securities may be consolidated and form a single series with the debt securities of the corresponding series and have the same terms as to status, redemption or otherwise as the debt securities of the corresponding series.

Concerning the Trustee

     The trustee may engage in transactions with, or perform services for, the Issuers and affiliates of the Issuers in the ordinary course of business. The trustee will perform only those duties that are specifically set forth in the indenture unless an event of default under the indenture occurs and is continuing. In case an event of default occurs and is continuing, the trustee will exercise the same degree of care and skill as a prudent individual would exercise in the conduct of his or her own affairs.

Applicable Law

     The debt securities and the indenture will be governed by, and construed in accordance, with the laws of the State of New York.

DESCRIPTION OF OMNICOM GROUP INC. SUBSCRIPTION RIGHTS

     The following summary of certain provisions of the subscription rights does not purport to be complete and is subject to, and qualified in its entirety by reference to, the provisions of the certificate evidencing the subscription rights that will be filed with the SEC in connection with the offering of any such subscription rights.

General

     Omnicom Group Inc. may issue subscription rights to purchase common stock, preferred stock, or warrants to purchase preferred stock or common stock. Subscription rights may be issued independently or together with any other offered security and may or may not be transferable by the person purchasing or receiving the subscription rights. In connection with any subscription rights offering to our stockholders, we may enter into a standby underwriting arrangement with one or more underwriters pursuant to which such underwriters will purchase any offered securities remaining unsubscribed for after such subscription rights offering. In connection with a subscription rights offering to our stockholders, we will distribute certificates evidencing the subscription rights and a prospectus supplement to our stockholders on the record date that we set for receiving subscription rights in such subscription rights offering.

     The applicable prospectus supplement will describe the following terms of subscription rights in respect of which this prospectus is being delivered:

• the title of such subscription rights;

• the securities for which such subscription rights are exercisable;

• the exercise price for such subscription rights;

• the number of such subscription rights issued to each stockholder;

• the extent to which such subscription rights are transferable;

• if applicable, a discussion of the material United States federal income tax considerations applicable to the issuance or exercise of such subscription rights;

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• the date on which the right to exercise such subscription rights shall commence, and the date on which such rights shall expire (subject to any extension);

• the extent to which such subscription rights include an over-subscription privilege with respect to unsubscribed securities;

• if applicable, the material terms of any standby underwriting or other purchase arrangement that we may enter into in connection with the subscription rights offering, and

• any other terms of such subscription rights, including terms, procedures and limitations relating to the exchange and exercise of such subscription rights.

Exercise of Subscription Rights

     Each subscription right will entitle the holder of the subscription right to purchase for cash such amount of shares of preferred stock, common stock, warrants or any combination thereof, at such exercise price as shall in each case be set forth in, or be determinable as set forth in, the prospectus supplement relating to the subscription rights offered thereby. Subscription rights may be exercised at any time up to the close of business on the expiration date for such subscription rights set forth in the prospectus supplement. After the close of business on the expiration date, all unexercised subscription rights will become void.

     Subscription rights may be exercised as set forth in the prospectus supplement relating to the subscription rights offered thereby. Upon receipt of payment and the subscription rights certificate properly completed and duly executed at the corporate trust office of the subscription rights agent or any other office indicated in the prospectus supplement, we will forward, as soon as practicable, the shares of preferred stock or common stock, depositary shares or warrants purchasable upon such exercise. We may determine to offer any unsubscribed offered securities directly to persons other than stockholders, to or through agents, underwriters or dealers or through a combination of such methods, including pursuant to standby underwriting arrangements, as set forth in the applicable prospectus supplement.

DESCRIPTION OF OMNICOM GROUP INC. WARRANTS

     The following briefly summarizes the material terms and provisions of the warrants to purchase common stock or preferred stock that Omnicom Group may offer pursuant to this prospectus, other than pricing and related terms which will be disclosed in a prospectus supplement. You should read the particular terms of the warrants that are offered by Omnicom Group Inc., which will be described in more detail in a prospectus supplement. The prospectus supplement will also state whether any of the general provisions summarized below do not apply to the warrants being offered. A copy of each form of warrant agreement, including the form of certificate that will represent a particular warrant, will be filed as an exhibit to one of Omnicom Group Inc.’s future SEC reports and incorporated by reference in the registration statement to which this prospectus relates. You should read the more detailed provisions of the specific warrant agreement and the warrant certificate for provisions that may be important to you.

     Warrants may be issued independently or together with common stock, preferred stock or debt securities, as applicable, and will be separate from any such offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between Omnicom Group Inc. and a bank or trust company, as warrant agent. A single bank or trust company may act as warrant agent for more than one series of warrants. The warrant agent will act solely as the agent of Omnicom Group Inc. under the applicable warrant agreement and will not assume any obligation or relationship of agency or trust for or with any owners of such warrants.

     The applicable prospectus supplement will describe the terms of common stock warrants or preferred stock warrants offered, the stock warrant agreement relating to the common stock warrants or preferred stock warrants, and the common stock warrant certificates or the preferred stock warrant certificates representing the common stock warrants or preferred stock warrants, as applicable, including the following:

• the title of the warrants;

• the securities for which the warrants are exercisable;

• the price or prices at which the warrants will be issued;

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• the number of warrants issued with each share of common stock or preferred stock;

• any provisions for adjustment of the number or amount of shares of common stock or preferred stock receivable upon exercise of the warrants or the exercise price of the warrants;

• if applicable, the date on and after which the warrants and the related common stock or preferred stock will be separately transferable;

• the date on which the right to exercise the warrants shall commence, and the date on which the right shall expire;

• the maximum or minimum number of warrants which may be exercised at any time;

• if applicable, a discussion of the material United States federal income tax considerations applicable to the exercise of the warrants; and

• any other terms of the warrants, including terms, procedures and limitations relating to the exchange and exercise of the warrants.

Exercise Of Warrants

     Each warrant entitles the holder to purchase for cash the principal amount of debt securities or shares of common stock or preferred stock at the exercise price set forth in the prospectus supplement relating to the offered warrants.

     The prospectus supplement for the offered warrants will describe the procedures for exercising the warrants and will set forth the expiration date of the warrants. Upon exercise of the warrants, Omnicom Group Inc. will forward the shares of common stock or preferred stock purchased. If less than all of the warrants represented by the warrant certificate are exercised, a new warrant certificate will be issued for the remaining warrants. Warrants may be exercised at any time up to the close of business on the expiration date set forth in the prospectus supplement for the offered warrants. After the close of business on the expiration date, unexercised warrants will become void.

PLAN OF DISTRIBUTION

     We may sell the offered securities (a) through agents; (b) through underwriters or dealers; (c) directly to one or more purchasers; or (d) through a combination of any of these methods of sale. We will identify the specific plan of distribution, including any underwriters, dealers, agents or direct purchasers and their compensation in a prospectus supplement.

VALIDITY OF SECURITIES

     In connection with particular offerings of the securities in the future, and if stated in the applicable prospectus supplements, the validity of those securities may be passed upon for us by Jones Day, New York, New York and for any underwriters or agents by counsel named in the applicable prospectus supplement. Certain legal matters in connection with the securities and any offering of those securities will be passed upon for us by our general counsel, Michael O’Brien, Esq. Mr. O’Brien is an officer of Omnicom Group Inc. and has received, and may in the future receive, awards of restricted stock and other benefits determined by reference to Omnicom Group Inc. securities. Mr. O’Brien beneficially owns or has rights to acquire a total of less than 1% of Omnicom Group Inc.’s outstanding common stock.

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     The consolidated financial statements and financial statement schedule of Omnicom Group Inc. and subsidiaries as of December 31, 2008 and 2007, and for each of the years in the three-year period ended December 31, 2008, and the effectiveness of our internal control over financial reporting as of December 31, 2008, are incorporated by reference herein in reliance upon the reports of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing. The audit report dated February 27, 2009 refer to the adoption of Statement of Financial Accounting Standards No. 158, “Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans an amendment of FASB Statements No. 87, 88, 106, and 132(R)” on December 31, 2006.

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