<SEC-DOCUMENT>0001213900-25-094068.txt : 20250930
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<ACCEPTANCE-DATETIME>20250930171528
ACCESSION NUMBER:		0001213900-25-094068
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		15
CONFORMED PERIOD OF REPORT:	20250930
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20250930
DATE AS OF CHANGE:		20250930

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OMNICOM GROUP INC.
		CENTRAL INDEX KEY:			0000029989
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ADVERTISING AGENCIES [7311]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				131514814
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10551
		FILM NUMBER:		251361492

	BUSINESS ADDRESS:	
		STREET 1:		280 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2124153600

	MAIL ADDRESS:	
		STREET 1:		280 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OMNICOM GROUP INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DOYLE DANE BERNBACH GROUP INC
		DATE OF NAME CHANGE:	19861117

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DOYLE DANE BERNBACH INTERNATIONAL INC
		DATE OF NAME CHANGE:	19850604
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>UNITED STATES</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>SECURITIES AND EXCHANGE COMMISSION</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>Washington D.C., 20549</b></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>CURRENT REPORT</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>Pursuant to Section 13 or 15(d)</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>of the Securities Exchange Act of 1934</b></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>Date of Report (Date of earliest event reported):
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<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><b>(Exact name of registrant as specified in its
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Not Applicable</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>(Former name or former address, if changed
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><span style="font-family: Times New Roman, Times, Serif; font-size: 7pt"><b>&#160;</b></span></p>

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<p style="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Securities registered pursuant to Section 12(b) of the Act:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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class</b></p></td>
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    <td style="border-bottom: black 1.5pt solid; padding-top: 0.25pt; padding-right: 0.5pt; padding-left: 0.5pt; text-align: center; width: 32%"><b>Trading Symbol(s)</b></td>
    <td style="padding-bottom: 1.5pt; text-align: center; width: 2%">&#160;</td>
    <td style="border-bottom: black 1.5pt solid; padding-top: 0.25pt; padding-right: 0.5pt; padding-left: 0.5pt; text-align: center; width: 32%"><b>Name of each exchange on which registered</b></td></tr>
  <tr style="vertical-align: top; background-color: #CCEEFF">
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  <tr style="vertical-align: top; background-color: white">
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  <tr style="vertical-align: top; background-color: #CCEEFF">
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    <td style="text-align: center">&#160;</td>
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    <td style="text-align: center">&#160;</td>
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  <tr style="vertical-align: top; background-color: white">
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    <td style="text-align: center">&#160;</td>
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    <td style="text-align: center">&#160;</td>
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    <td style="text-align: center">&#160;</td>
    <td style="padding: 0.25pt 0.5pt; text-align: center"><span id="xdx_902_edei--SecurityExchangeName_c20250930__20250930__us-gaap--StatementClassOfStockAxis__custom--Sec2.250SeniorNotesDue2033Member_zDjMzSIk8kb1"><ix:nonNumeric contextRef="From2025-09-302025-09-30_custom_Sec2.250SeniorNotesDue2033Member" format="ixt-sec:exchnameen" id="Fact000039" name="dei:SecurityExchangeName">New York Stock Exchange</ix:nonNumeric></span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange
Act of 1934 (&#167;240.12b-2 of this chapter).</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><span style="font-family: Times New Roman, Times, Serif"><span id="xdx_900_edei--EntityEmergingGrowthCompany_c20250930__20250930_z1tRRXQ9Rcvj"><ix:nonNumeric contextRef="AsOf2025-09-30" format="ixt:booleanfalse" id="Fact000040" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></span></span>
Emerging growth company</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If an emerging growth company,
indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised
financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. <span style="font-family: Times New Roman, Times, Serif">&#9744;</span></p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in"></p>

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<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in"></p>

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    <div style="border-bottom: Black 1.5pt solid; margin-top: 12pt; margin-bottom: 6pt"><p style="margin: 0pt">&#160;</p></div>
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    <!-- Field: /Page -->

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">Item 8.01 Other Events</p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">On September 30, 2025,
Omnicom Group Inc. (&#8220;Omnicom&#8221;) and The Interpublic Group of Companies, Inc. (&#8220;IPG&#8221;) published a joint press
release announcing that the regulatory approval process for Omnicom&#8217;s pending acquisition of IPG continues and has been
completed in all required jurisdictions other than Mexico and the European Union. Omnicom and IPG continue to expect that the
acquisition will close by December 31, 2025. Additionally, Omnicom extended the expiration date of its previously announced exchange
offers and consent solicitations for IPG&#8217;s outstanding notes from 5:00 p.m., New York City time, on September 30, 2025, to
5:00 p.m., New York City time, on October 31, 2025, unless further extended.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">A copy of the joint press
release announcing the regulatory update and extension of the expiration date of the exchange offers and consent solicitations is
attached hereto as Exhibit 99.1, and the information contained therein is incorporated herein by reference.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">This Form 8-K is not intended to and does not constitute
an offer to sell or purchase, or the solicitation of an offer to sell or purchase, or the solicitation of any vote of approval or the
solicitation of tenders or consents with respect to any security. No offer, solicitation, purchase or sale will be made in any jurisdiction
in which such an offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any
such jurisdiction.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><b><i>Cautionary Statement Regarding Forward-Looking
Statements</i></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><b>&#160;</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Certain statements in this Current Report on Form
8-K (including the exhibits) contain forward-looking statements, including statements within the meaning of the Private Securities Litigation
Reform Act of 1995. In addition, from time to time, Omnicom or IPG or their representatives have made, or may make, forward-looking statements,
orally or in writing. These statements may discuss goals, intentions and expectations as to future plans, trends, events, results of operations
or financial condition, or otherwise, based on current beliefs of Omnicom&#8217;s and IPG&#8217;s management as well as assumptions made
by, and information currently available to, Omnicom&#8217;s and IPG&#8217;s management. Forward-looking statements may be accompanied
by words such as &#8220;aim,&#8221; &#8220;anticipate,&#8221; &#8220;believe,&#8221; &#8220;plan,&#8221; &#8220;could,&#8221; &#8220;should,&#8221;
&#8220;would,&#8221; &#8220;estimate,&#8221; &#8220;expect,&#8221; &#8220;forecast,&#8221; &#8220;future,&#8221; &#8220;guidance,&#8221;
&#8220;intend,&#8221; &#8220;may,&#8221; &#8220;will,&#8221; &#8220;possible,&#8221; &#8220;potential,&#8221; &#8220;predict,&#8221; &#8220;project&#8221;
or similar words, phrases or expressions. These forward-looking statements are subject to various risks and uncertainties, many of which
are outside Omnicom&#8217;s and IPG&#8217;s control. Therefore, you should not place undue reliance on such statements. Factors that could
cause actual results to differ materially from those in the forward-looking statements include:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: left; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="text-align: left; width: 0.5in"/><td style="text-align: left; width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td style="text-align: left">risks relating to the pending merger between Omnicom and IPG, including: that the merger may not be completed in a timely manner or
at all, which could result in the termination of the exchange offers and consent solicitations; delays, unanticipated costs or restrictions
resulting from regulatory review of the merger, including the risk that Omnicom or IPG may be unable to obtain governmental and regulatory
approvals required for the merger, or that such approvals may result in the imposition of conditions that could adversely affect the combined
company or the expected benefits of the merger; uncertainties associated with the merger may cause a loss of both companies&#8217; management
personnel and other key employees, and cause disruptions to both companies&#8217; business relationships and a loss of clients; the merger
agreement subjects Omnicom and IPG to restrictions on business activities prior to the effective time of the merger; Omnicom and IPG are
expected to incur significant costs in connection with the merger and integration; litigation risks relating to the merger; the business
and operations of both companies may not be integrated successfully in the expected time frame; the merger may result in a loss of both
companies&#8217; clients, service providers, vendors, joint venture participants and other business counterparties; and the combined company
may fail to realize all or some of the anticipated benefits of the merger or fail to effectively manage its expanded operations;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>adverse economic conditions and disruptions, including geopolitical events, international hostilities, acts of terrorism, public health
crises, inflation or stagflation, tariffs and other trade barriers, central bank interest rate policies in countries that comprise Omnicom&#8217;s
and IPG&#8217;s major markets, labor and supply chain issues affecting the distribution of clients&#8217; products, or a disruption in
the credit markets;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td style="text-align: left">international, national or local economic conditions that could adversely affect Omnicom, IPG or their respective clients;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: left; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="text-align: left; width: 0.5in"/><td style="text-align: left; width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td style="text-align: left">losses on media purchases and production costs incurred on behalf of clients;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: left; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="text-align: left; width: 0.5in"/><td style="text-align: left; width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td style="text-align: left">reductions in client spending, a slowdown in client payments or a deterioration or disruption in the credit markets;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in"></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>the ability to attract new clients and retain existing clients in the manner anticipated;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>changes in client marketing and communications services requirements;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>failure to manage potential conflicts of interest between or among clients;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>unanticipated changes related to competitive factors in the marketing and communications services industries;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>unanticipated changes to, or the ability to hire and retain key personnel;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>currency exchange rate fluctuations;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>reliance on information technology systems and risks related to cybersecurity incidents;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>effective management of the risks, challenges and efficiencies presented by utilizing artificial intelligence (AI) technologies and
related partnerships;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>changes in legislation or governmental regulations affecting Omnicom, IPG or their respective clients;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>risks associated with assumptions made in connection with acquisitions, critical accounting estimates and legal proceedings;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>risks related to international operations, which are subject to the risks of currency repatriation restrictions, social or political
conditions and an evolving regulatory environment in high-growth markets and developing countries;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>risks related to environmental, social and governance goals and initiatives, including impacts from regulators and other stakeholders,
and the impact of factors outside of Omnicom&#8217;s and IPG&#8217;s respective control on such goals and initiatives;</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>the outcome of the exchange offers and consent solicitations; and</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">&#160;</p>

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<td style="width: 0.5in"/><td style="width: 0.25in"><span style="font: normal 10pt Times New Roman, Times, Serif">&#9679;</span></td><td>other business, financial, operational and legal risks and uncertainties detailed from time to time in Omnicom&#8217;s and IPG&#8217;s
Securities and Exchange Commission (&#8220;SEC&#8221;) filings.</td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The foregoing list of factors is not exhaustive.
You should carefully consider the foregoing factors and the other risks and uncertainties that may affect Omnicom&#8217;s and IPG&#8217;s
businesses, including those described in Omnicom&#8217;s and IPG&#8217;s respective Annual Reports on Form 10-K and in other documents
filed from time to time with the SEC. Forward-looking statements are based on the estimates and opinions of management at the time the
statements are made. Except to the extent required by applicable law, neither Omnicom nor IPG undertakes any obligation to publicly update
or revise any forward-looking statement, whether as a result of new information, future events or otherwise. You are cautioned not to
place undue reliance on these forward-looking statements that speak only as of the date hereof.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&#160;</p>

<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">Item 9.01 Financial Statements
and Exhibits</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">(d) Exhibits:</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&#160;</p>

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    <td style="text-align: left">99.1</td>
    <td>&#160;</td>
    <td><a href="ea025942501ex99-1_omnicom.htm">Press Release of Omnicom and IPG, dated September 30, 2025</a></td></tr>
  <tr style="vertical-align: top; background-color: White">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>




<p style="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SIGNATURE</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.25in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Pursuant to the requirements
of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto
duly authorized.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.25in">&#160;</p>

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    <td style="text-align: left; vertical-align: top">Date: September 30, 2025</td>
    <td style="text-align: left; vertical-align: top">By:</td>
    <td style="border-bottom: Black 1.5pt solid; text-align: left; vertical-align: top">/s/ Louis F. Januzzi</td></tr>
  <tr>
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    <td style="text-align: left; vertical-align: top">Louis F. Januzzi</td></tr>
  <tr>
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<TYPE>EX-99.1
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<FILENAME>ea025942501ex99-1_omnicom.htm
<DESCRIPTION>PRESS RELEASE OF OMNICOM AND IPG, DATED SEPTEMBER 30, 2025
<TEXT>
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<HEAD>
     <TITLE></TITLE>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Exhibit 99.1</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="ex99-1_001.jpg" ALT="" STYLE="height: 36px; width: 350px"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Omnicom and Interpublic Announce Regulatory
Update</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>and Extension of Exchange Offers </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>NEW YORK, </B>September 30, 2025 &ndash; Omnicom Group Inc. (&ldquo;Omnicom&rdquo;)
(NYSE: OMC) and The Interpublic Group of Companies, Inc. (&ldquo;IPG&rdquo;) (NYSE: IPG) today announced that the regulatory approval
process for Omnicom&rsquo;s pending acquisition of IPG continues and has been completed in all required jurisdictions other than Mexico
and the European Union. Omnicom and IPG continue to expect that the acquisition will close by December 31, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Additionally, Omnicom hereby extends the expiration date of its previously
announced exchange offers and consent solicitations for IPG&rsquo;s outstanding notes (as set forth in Appendix A to this press release)
from 5:00 p.m., New York City time, on September 30, 2025, to 5:00 p.m., New York City time, on October 31, 2025, unless further extended.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"># # #</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>About Omnicom</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Omnicom (NYSE: OMC) is a leading provider of data-inspired, creative
marketing and sales solutions. Omnicom&rsquo;s iconic agency brands are home to the industry&rsquo;s most innovative communications specialists
who are focused on driving intelligent business outcomes for their clients. The company offers a wide range of services in advertising,
strategic media planning and buying, precision marketing, retail and digital commerce, branding, experiential, public relations, healthcare
marketing and other specialty marketing services to over 5,000 clients in more than 70 countries. For more information, visit <U STYLE="text-decoration: none">www.omnicomgroup.com</U>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>About IPG</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">IPG (NYSE: IPG) (<U STYLE="text-decoration: none">www.interpublic.com</U>) is a values-based, data-fueled,
and creatively driven provider of marketing solutions. Home to some of the world's best-known and most innovative communications specialists,
IPG global brands include Acxiom, Craft, FCB, FutureBrand, Golin, Initiative, IPG Health, IPG Mediabrands, Jack Morton, KINESSO, MAGNA,
McCann, Mediahub, Momentum, MRM, MullenLowe Global, Octagon, UM, Weber Shandwick and more.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B><U>Contacts</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">Omnicom Media:</TD>
    <TD STYLE="width: 50%">Omnicom Investors:</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>Joanne Trout</TD>
    <TD>Gregory Lundberg</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>joanne.trout@omc.com</TD>
    <TD>greg.lundberg@omc.com</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>IPG Media:</TD>
    <TD>IPG Investors:</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>Tom Cunningham</TD>
    <TD>Jerry Leshne</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>tom.cunningham@interpublic.com</TD>
    <TD>jleshne@interpublic.com</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


<!-- Field: Page; Sequence: 1 -->
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>FORWARD-LOOKING STATEMENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Certain statements in this press release contain forward-looking statements,
including statements within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, from time to time, Omnicom
or IPG or their representatives have made, or may make, forward-looking statements, orally or in writing. These statements may discuss
goals, intentions and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based
on current beliefs of Omnicom&rsquo;s and IPG&rsquo;s management as well as assumptions made by, and information currently available to,
Omnicom&rsquo;s and IPG&rsquo;s management. Forward-looking statements may be accompanied by words such as &ldquo;aim,&rdquo; &ldquo;anticipate,&rdquo;
&ldquo;believe,&rdquo; &ldquo;plan,&rdquo; &ldquo;could,&rdquo; &ldquo;should,&rdquo; &ldquo;would,&rdquo; &ldquo;estimate,&rdquo; &ldquo;expect,&rdquo;
&ldquo;forecast,&rdquo; &ldquo;future,&rdquo; &ldquo;guidance,&rdquo; &ldquo;intend,&rdquo; &ldquo;may,&rdquo; &ldquo;will,&rdquo; &ldquo;possible,&rdquo;
&ldquo;potential,&rdquo; &ldquo;predict,&rdquo; &ldquo;project&rdquo; or similar words, phrases or expressions. These forward-looking
statements are subject to various risks and uncertainties, many of which are outside Omnicom&rsquo;s and IPG&rsquo;s control. Therefore,
you should not place undue reliance on such statements. Factors that could cause actual results to differ materially from those in the
forward-looking statements include:</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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relating to the pending merger between Omnicom and IPG, including: that the merger may not be completed in a timely manner or at all,
which could result in the termination of the exchange offers and consent solicitations; delays, unanticipated costs or restrictions resulting
from regulatory review of the merger, including the risk that Omnicom or IPG may be unable to obtain governmental and regulatory approvals
required for the merger, or that such approvals may result in the imposition of conditions that could adversely affect the combined company
or the expected benefits of the merger; uncertainties associated with the merger may cause a loss of both companies&rsquo; management
personnel and other key employees, and cause disruptions to both companies&rsquo; business relationships and a loss of clients; the merger
agreement subjects Omnicom and IPG to restrictions on business activities prior to the effective time of the merger; Omnicom and IPG
are expected to incur significant costs in connection with the merger and integration; litigation risks relating to the merger; the business
and operations of both companies may not be integrated successfully in the expected time frame; the merger may result in a loss of both
companies&rsquo; clients, service providers, vendors, joint venture participants and other business counterparties; and the combined
company may fail to realize all or some of the anticipated benefits of the merger or fail to effectively manage its expanded operations;</FONT></TD>
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economic conditions and disruptions, including geopolitical events, international hostilities, acts of terrorism, public health crises,
inflation or stagflation, tariffs and other trade barriers, central bank interest rate policies in countries that comprise Omnicom&rsquo;s
and IPG&rsquo;s major markets, labor and supply chain issues affecting the distribution of clients&rsquo; products, or a disruption in
the credit markets;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">international,
national or local economic conditions that could adversely affect Omnicom, IPG or their respective clients;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">losses
on media purchases and production costs incurred on behalf of clients;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">reductions
in client spending, a slowdown in client payments or a deterioration or disruption in the credit markets;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">the
ability to attract new clients and retain existing clients in the manner anticipated;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">changes
in client marketing and communications services requirements;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0"></P>

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<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">failure
to manage potential conflicts of interest between or among clients;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">unanticipated
changes related to competitive factors in the marketing and communications services industries;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">unanticipated
changes to, or the ability to hire and retain key personnel;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">currency
exchange rate fluctuations;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">reliance
on information technology systems and risks related to cybersecurity incidents;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">effective
management of the risks, challenges and efficiencies presented by utilizing artificial intelligence (AI) technologies and related partnerships;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">changes
in legislation or governmental regulations affecting Omnicom, IPG or their respective clients;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">risks
associated with assumptions made in connection with acquisitions, critical accounting estimates and legal proceedings;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">risks
related to international operations, which are subject to the risks of currency repatriation restrictions, social or political conditions
and an evolving regulatory environment in high-growth markets and developing countries;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">risks
related to environmental, social and governance goals and initiatives, including impacts from regulators and other stakeholders, and
the impact of factors outside of Omnicom's and IPG&rsquo;s respective control on such goals and initiatives;</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>


<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">the
outcome of the exchange offers and consent solicitations; and</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="text-align: left; width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left">&#9679;</TD><TD STYLE="text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">other
business, financial, operational and legal risks and uncertainties detailed from time to time in Omnicom&rsquo;s and IPG&rsquo;s Securities
and Exchange Commission (&ldquo;SEC&rdquo;) filings.</FONT></TD>
</TR></TABLE>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The foregoing list of factors is not exhaustive. You should carefully
consider the foregoing factors and the other risks and uncertainties that may affect Omnicom&rsquo;s and IPG&rsquo;s businesses, including
those described in Omnicom&rsquo;s and IPG&rsquo;s respective Annual Reports on Form 10-K and in other documents filed from time to time
with the SEC. Forward-looking statements are based on the estimates and opinions of management at the time the statements are made. Except
to the extent required by applicable law, neither Omnicom nor IPG undertakes any obligation to publicly update or revise any forward-looking
statement, whether as a result of new information, future events or otherwise. You are cautioned not to place undue reliance on these
forward-looking statements that speak only as of the date hereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>NO OFFER OR SOLICITATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This communication is not intended to and does not constitute an offer
to purchase, or the solicitation of an offer to sell, or the solicitation of tenders or consents with respect to any security. No offer,
solicitation, purchase or sale will be made in any jurisdiction in which such an offer, solicitation, or sale would be unlawful prior
to registration or qualification under the securities laws of any such jurisdiction. In the case of the exchange offers and consent solicitations,
the exchange offers and consent solicitations are being made solely pursuant to the Statement (as defined in Appendix A) and only to such
persons and in such jurisdictions as is permitted under applicable law.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><U>Appendix A</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Omnicom hereby extends the expiration date of its previously announced
Exchange Offers and Consent Solicitations for the Existing IPG Notes (each as defined below) from 5:00 p.m., New York City time, on September
30, 2025, to 5:00 p.m., New York City time, on October 31, 2025, unless further extended (the &ldquo;Expiration Date&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The (A) offers to exchange (each an &ldquo;Exchange Offer&rdquo; and,
collectively the &ldquo;Exchange Offers&rdquo;) any and all outstanding 4.650% Notes due 2028 (the &ldquo;Existing IPG 2028 Notes&rdquo;),
4.750% Notes due 2030 (the &ldquo;Existing IPG 2030 Notes&rdquo;), 2.400% Notes due 2031 (the &ldquo;Existing IPG 2031 Notes&rdquo;),
5.375% Notes due 2033 (the &ldquo;Existing IPG 2033 Notes&rdquo;), 3.375% Notes due 2041 (the &ldquo;Existing IPG 2041 Notes&rdquo;) and
5.400% Notes due 2048 (the &ldquo;Existing IPG 2048 Notes&rdquo; and, together with the Existing IPG 2028 Notes, the Existing IPG 2030
Notes, the Existing IPG 2031 Notes, the Existing IPG 2033 Notes and the Existing IPG 2041 Notes, the &ldquo;Existing IPG Notes&rdquo;),
each series as issued by IPG, for (1) up to $2,950,000,000 aggregate principal amount of new senior notes to be issued by Omnicom (the
&ldquo;New Omnicom Notes&rdquo;) and (2) cash; and (B) related solicitations of consents on behalf of IPG (each a &ldquo;Consent Solicitation&rdquo;
and, collectively, the &ldquo;Consent Solicitations&rdquo;) from Eligible Holders (as defined below) of a majority in aggregate principal
amount outstanding of each series of Existing IPG Notes, to amend each indenture governing each series of Existing IPG Notes (each an
&ldquo;Existing IPG Indenture&rdquo; and, collectively, the &ldquo;Existing IPG Indentures&rdquo;) are made pursuant to the terms and
subject to the conditions set forth in the offering memorandum and consent solicitation statement, dated August 11, 2025 (the &ldquo;Statement&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">As of 5:00 p.m., New York City time, on September 29, 2025, the principal
amounts of Existing IPG Notes set forth in the table below had been validly tendered and not validly withdrawn (and consents thereby validly
delivered and not validly revoked).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">Title of Series of</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">CUSIP&nbsp;Number&nbsp;of</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">Title&nbsp;Series&nbsp;of</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">Aggregate<BR>
 Principal</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Existing IPG Notes Tendered</TD><TD STYLE="padding-bottom: 1.5pt; text-align: center; font-weight: bold">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Existing<BR>
IPG Notes</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Existing&nbsp;IPG<BR>
Notes</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">New&nbsp;Omnicom<BR>
Notes</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Amount<BR>
Outstanding</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Principal<BR>
Amount</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1.5pt solid; text-align: center; font-weight: bold">Percentage</TD><TD STYLE="text-align: center; padding-bottom: 1.5pt; font-weight: bold">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 20%; text-align: left">4.650% Notes due 2028</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 20%; text-align: center">460690BP4</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 22%; text-align: center">4.650% Senior Notes due 2028</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">500,000,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">449,602,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right">89.92</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">4.750% Notes due 2030</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">460690BR0</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">4.750% Senior Notes due 2030</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">650,000,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">590,399,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">90.83</TD><TD STYLE="text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">2.400% Notes due 2031</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">460690BT6</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">2.400% Senior Notes due 2031</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">500,000,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">457,079,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">91.42</TD><TD STYLE="text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">5.375% Notes due 2033</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">460690BU3</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">5.375% Senior Notes due 2033</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">300,000,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">276,569,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">92.19</TD><TD STYLE="text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">3.375% Notes due 2041</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">460690BS8</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3.375% Senior Notes due 2041</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">500,000,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">493,860,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">98.77</TD><TD STYLE="text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">5.400% Notes due 2048</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: center">460690BQ2</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: center">5.400% Senior Notes due 2048</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">500,000,000</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">491,366,000</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">98.27</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">%</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">2,950,000,000</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">2,758,875,000</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">93.52</TD><TD STYLE="font-weight: bold; text-align: left">%</TD></TR>
  </TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On the early tender date and consent revocation deadline of August
22, 2025, Omnicom received consents sufficient to amend the respective Existing IPG Indentures to eliminate certain of the covenants,
restrictive provisions and events of default from such Existing IPG Indentures (collectively, the &ldquo;Proposed Amendments&rdquo;).
On August 22, 2025, IPG executed a supplemental indenture (the &ldquo;New IPG Supplemental Indenture&rdquo;) to the Existing IPG Indentures
in order to effect the Proposed Amendments. The Proposed Amendments included in the New IPG Supplemental Indenture will become operative
(i) only upon the settlement date for the Exchange Offers and the Consent Solicitations, which is expected to be within two business days
after the Expiration Date and (ii) subject to satisfaction or waiver of certain conditions, including the completion of Omnicom&rsquo;s
pending transaction to acquire IPG contemplated by the Agreement and Plan of Merger, dated as of December 8, 2024 (such transaction, the
&ldquo;Merger&rdquo;). Omnicom may waive any such condition at any time with respect to an Exchange Offer (other than the condition that
the Merger shall have been completed).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The settlement date is expected to be within two business days after
the Expiration Date. To the extent the completion of the Merger is not anticipated to occur on or before the Expiration Date, for any
reason, Omnicom anticipates further extending the Expiration Date until such time that the Merger has been completed. Any such extension
of the Expiration Date will correspondingly extend the settlement date. Omnicom will provide notice of any such extension in advance of
the Expiration Date. During any extension of the Expiration Date, all Existing IPG Notes not previously tendered (or validly withdrawn)
in an extended Exchange Offer will remain subject to such Exchange Offer and may be accepted for exchange by Omnicom. Following receipt
of the requisite consents and the execution of the New IPG Supplemental Indenture on August 22, 2025, consents delivered in the Consent
Solicitations with respect to each series of Existing IPG Notes can no longer be revoked.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The regulatory approval process for the Merger is continuing to progress
and the companies expect to complete the transaction this year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The Statement and other documents relating to the Exchange Offers and
Consent Solicitations will only be distributed to holders of Existing IPG Notes who complete and return a letter of eligibility certifying
that they are (i) &ldquo;qualified institutional buyers&rdquo; within the meaning of Rule 144A under the Securities Act of 1933, as amended
(&ldquo;Securities Act&rdquo;), or (ii) not &ldquo;U.S. persons&rdquo; and are outside of the United States within the meaning of Regulation
S under the Securities Act and who are &ldquo;non-U.S. qualified offerees&rdquo; (as defined in the Statement) (such persons, &ldquo;Eligible
Holders&rdquo;). Only Eligible Holders are authorized to receive and review the Statement and only Eligible Holders are permitted to tender
Existing IPG Notes in the Exchange Offers and deliver consents in the Consent Solicitations. Eligible Holders of Existing IPG Notes who
desire to obtain and complete the letter of eligibility and obtain copies of the Statement should call D.F. King &amp; Co., Inc., the
Exchange and Information Agent, at (800) 290-6432 (toll-free) or (212) 401-9970 (collect for banks and brokers). Information related to
the Exchange Offers and Consent Solicitations, together with any updates, will be available at www.dfking.com/omnicom.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Except as described in this press release and the joint press release
issued by Omnicom and IPG on September 9, 2025, all other terms of the Exchange Offers and Consent Solicitations remain unchanged.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Among other risks described in the Statement, the Exchange Offers and
Consent Solicitations are expected to result in reduced liquidity for the Existing IPG Notes that are not exchanged, and the Proposed
Amendments to the Existing IPG Indenture will reduce protection to remaining holders of Existing IPG Notes. Eligible Holders should refer
to the Statement for more details on the risks related to the Exchange Offers and Consent Solicitations.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Omnicom has engaged BofA Securities, Inc., J.P. Morgan Securities LLC
and Wells Fargo Securities, LLC as lead dealer managers and solicitation agents (the &ldquo;Lead Dealer Managers&rdquo;) and each of Barclays
Capital Inc., BNP Paribas Securities Corp., Citigroup Global Markets Inc., Deutsche Bank Securities Inc. and HSBC Securities (USA) Inc.,
as co-dealer managers (together, the &ldquo;Co-Dealer Managers&rdquo; and together with the Lead Dealer Managers, the &ldquo;Dealer Managers&rdquo;)
for the Exchange Offers and Consent Solicitations. Please direct questions regarding the Exchange Offers and Consent Solicitations to
BofA Securities, Inc. at (888) 292-0070 (toll-free) or (980) 387-3907 (collect for banks and brokers), J.P. Morgan Securities LLC at (866)
834-4666 (toll-free) or (212) 834-3554 (collect for banks and brokers) or Wells Fargo Securities, LLC at (866) 309-6316 (toll free) or
(332) 214-6330.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The New Omnicom Notes have not been registered under the Securities
Act or any state or foreign securities laws, and they may not be offered or sold absent registration except pursuant to an exemption from,
or in a transaction not subject to, the registration requirements of the Securities Act and any applicable state and foreign securities
laws. The Statement has not been filed with or reviewed by the federal or any state securities commission or regulatory authority of any
country, nor has any such commission or authority passed upon the accuracy or adequacy of the Statement. Any representation to the contrary
is unlawful and may be a criminal offense.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">None of Omnicom, IPG, any of their respective directors or officers,
the Dealer Managers or the Exchange and Information Agent, or in each case, any of their respective affiliates, makes any recommendation
as to whether or not Eligible Holders should tender or refrain from tendering all or any portion of the Existing IPG Notes in response
to the Exchange Offers, or deliver consents in response to the Consent Solicitations. Eligible Holders will need to make their own decision
as to whether to tender Existing IPG Notes in the Exchange Offer and participate in the Consent Solicitations and, if so, the principal
amount of Existing IPG Notes to tender.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>6
<FILENAME>omc-20250930_lab.xml
<DESCRIPTION>XBRL LABEL FILE
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      <link:loc xlink:type="locator" xlink:href="omc-20250930.xsd#OMC_Sec0.800SeniorNotesDue2027Member" xlink:label="OMC_Sec0.800SeniorNotesDue2027Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OMC_Sec0.800SeniorNotesDue2027Member" xlink:to="OMC_Sec0.800SeniorNotesDue2027Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OMC_Sec0.800SeniorNotesDue2027Member_lbl" xml:lang="en-US">0.800% Senior Notes due 2027</link:label>
      <link:loc xlink:type="locator" xlink:href="omc-20250930.xsd#OMC_Sec1.400SeniorNotesDue2031Member" xlink:label="OMC_Sec1.400SeniorNotesDue2031Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OMC_Sec1.400SeniorNotesDue2031Member" xlink:to="OMC_Sec1.400SeniorNotesDue2031Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OMC_Sec1.400SeniorNotesDue2031Member_lbl" xml:lang="en-US">1.400% Senior Notes due 2031</link:label>
      <link:loc xlink:type="locator" xlink:href="omc-20250930.xsd#OMC_Sec3.700SeniorNotesDue2032Member" xlink:label="OMC_Sec3.700SeniorNotesDue2032Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OMC_Sec3.700SeniorNotesDue2032Member" xlink:to="OMC_Sec3.700SeniorNotesDue2032Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OMC_Sec3.700SeniorNotesDue2032Member_lbl" xml:lang="en-US">3.700% Senior Notes due 2032</link:label>
      <link:loc xlink:type="locator" xlink:href="omc-20250930.xsd#OMC_Sec2.250SeniorNotesDue2033Member" xlink:label="OMC_Sec2.250SeniorNotesDue2033Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OMC_Sec2.250SeniorNotesDue2033Member" xlink:to="OMC_Sec2.250SeniorNotesDue2033Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="OMC_Sec2.250SeniorNotesDue2033Member_lbl" xml:lang="en-US">2.250% Senior Notes due 2033</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US">Document Type</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US">Amendment Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentDescription" xlink:to="dei_AmendmentDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentDescription_lbl" xml:lang="en-US">Amendment Description</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentRegistrationStatement" xlink:label="dei_DocumentRegistrationStatement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentRegistrationStatement" xlink:to="dei_DocumentRegistrationStatement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentRegistrationStatement_lbl" xml:lang="en-US">Document Registration Statement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport" xlink:label="dei_DocumentAnnualReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAnnualReport" xlink:to="dei_DocumentAnnualReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentQuarterlyReport" xlink:to="dei_DocumentQuarterlyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentTransitionReport" xlink:to="dei_DocumentTransitionReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentTransitionReport_lbl" xml:lang="en-US">Document Transition Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyReport" xlink:to="dei_DocumentShellCompanyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyReport_lbl" xml:lang="en-US">Document Shell Company Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyEventDate" xlink:label="dei_DocumentShellCompanyEventDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyEventDate_lbl" xml:lang="en-US">Document Shell Company Event Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodStartDate" xlink:label="dei_DocumentPeriodStartDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine3" xlink:label="dei_EntityAddressAddressLine3" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine3_lbl" xml:lang="en-US">Entity Address, Address Line Three</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressStateOrProvince" xlink:to="dei_EntityAddressStateOrProvince_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCountry" xlink:label="dei_EntityAddressCountry" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCountry" xlink:to="dei_EntityAddressCountry_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressPostalZipCode_lbl" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CountryRegion" xlink:label="dei_CountryRegion" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CountryRegion" xlink:to="dei_CountryRegion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CityAreaCode_lbl" xml:lang="en-US">City Area Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LocalPhoneNumber_lbl" xml:lang="en-US">Local Phone Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Extension" xlink:label="dei_Extension" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
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<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
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<span style="display: none;">v3.25.2</span><table class="report" border="0" cellspacing="2" id="id2">
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<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Sep. 30, 2025</div></th>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
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</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Sep. 30,  2025<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">1-10551<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">OMNICOM GROUP INC.<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000029989<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">13-1514814<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">NY<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">280 Park Avenue<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">New York<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">NY<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">10017<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">212<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">415-3600<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=OMC_CommonStockParValue0.15PerShareMember', window );">Common Stock, par value $0.15 per share</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, par value $0.15 per share<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OMC<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=OMC_Sec0.800SeniorNotesDue2027Member', window );">0.800% Senior Notes due 2027</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">0.800% Senior Notes due 2027<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OMC/27<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=OMC_Sec1.400SeniorNotesDue2031Member', window );">1.400% Senior Notes due 2031</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">1.400% Senior Notes due 2031<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OMC/31<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=OMC_Sec3.700SeniorNotesDue2032Member', window );">3.700% Senior Notes due 2032</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">3.700% Senior Notes due 2032<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OMC/32<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_us-gaap_StatementClassOfStockAxis=OMC_Sec2.250SeniorNotesDue2033Member', window );">2.250% Senior Notes due 2033</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">2.250% Senior Notes due 2033<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OMC/33<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NYSE<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14a<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementClassOfStockAxis=OMC_CommonStockParValue0.15PerShareMember">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementClassOfStockAxis=OMC_CommonStockParValue0.15PerShareMember</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementClassOfStockAxis=OMC_Sec0.800SeniorNotesDue2027Member">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">us-gaap_StatementClassOfStockAxis=OMC_Sec0.800SeniorNotesDue2027Member</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_us-gaap_StatementClassOfStockAxis=OMC_Sec1.400SeniorNotesDue2031Member">
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