OMC / Omnicom Group Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Omnicom Group Inc.
US ˙ NYSE ˙ US6819191064

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SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Omnicom Group Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 25, 2025 EX-99.1

Omnicom and Interpublic Announce Results of Early Participation in Exchange Offers and Consent Solicitations

Exhibit 99.1 Omnicom and Interpublic Announce Results of Early Participation in Exchange Offers and Consent Solicitations NEW YORK, August 25, 2025 – Omnicom Group Inc. (“Omnicom”) (NYSE: OMC) and The Interpublic Group of Companies, Inc. (“IPG”) (NYSE: IPG) today announced that in connection with Omnicom’s previously announced offers to exchange (each an “Exchange Offer” and, collectively the “Exc

August 25, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C., 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 25, 2025 OMNICOM GROUP INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C., 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 25, 2025 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction of incorporation) (Commission File N

August 11, 2025 EX-99.2

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

Exhibit 99.2 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS On December 8, 2024, Omnicom Group Inc. (“Omnicom”) entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among Omnicom, EXT Subsidiary Inc., a direct wholly owned subsidiary of Omnicom (“Merger Sub”), and The Interpublic Group of Companies, Inc. (“IPG”), pursuant to which, subject to the terms and con

August 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C., 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 OMNICOM GROUP INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C., 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 11, 2025 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction of incorporation) (Commission File N

August 11, 2025 EX-99.1

Omnicom and Interpublic Announce Exchange Offers and Consent Solicitations

Exhibit 99.1 Omnicom and Interpublic Announce Exchange Offers and Consent Solicitations NEW YORK, August 11, 2025 – Omnicom Group Inc. (“Omnicom”) (NYSE: OMC) and The Interpublic Group of Companies, Inc. (“IPG”) (NYSE: IPG) today announced that in connection with Omnicom’s pending transaction to acquire IPG contemplated by the Agreement and Plan of Merger, dated as of December 8, 2024 (such transa

July 16, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

July 15, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 15, 2025 OMNICOM GROUP INC.

July 15, 2025 EX-99.2

2025 Second Quarter July 15, 2025 2 Highlights Revenue • Q2 2025 organic revenue growth of 3.0% • Media & Advertising (+8.2%) and Precision Marketing (+5.0%), together representing 68% of total revenue with combined organic growth in excess of 7% Inc

a2025q2investorpresentat 2025 Second Quarter July 15, 2025 2 Highlights Revenue • Q2 2025 organic revenue growth of 3.

July 15, 2025 EX-99.1

OMNICOM REPORTS SECOND QUARTER 2025 RESULTS

OMNICOM REPORTS SECOND QUARTER 2025 RESULTS 2025 Second Quarter: •Revenue of $4.0 billion, with organic growth of 3.0% •Net income of $257.6 million; $401.1 million Non-GAAP adjusted •Diluted earnings per share of $1.31; $2.05 Non-GAAP adjusted •Operating income of $439.2 million; Non-GAAP Adj. EBITA of $613.8 million with 15.3% margin NEW YORK, July 15, 2025 - Omnicom (NYSE: OMC) today announced

June 30, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: OMNICOM GROUP RETIREMENT SAVINGS PLAN B. Name of issuer of the securities held pursuant to

June 23, 2025 EX-99.1

Omnicom and Interpublic Clear FTC Antitrust Review

Exhibit 99.1 Omnicom and Interpublic Clear FTC Antitrust Review NEW YORK, June 23, 2025 – Omnicom (NYSE: OMC) and Interpublic (NYSE: IPG) today announced that the U.S. Federal Trade Commission (FTC) has concluded its antitrust review of Omnicom’s proposed acquisition of Interpublic and reached agreement with Omnicom and IPG on a mutually acceptable consent order. “We are delighted that our transac

June 23, 2025 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 23, 2025 OMNICOM GROUP INC.

May 14, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 12, 2025 OMNICOM GROUP INC.

May 14, 2025 EX-10.1

Amended and Restated Employment Agreement, dated as of May 12, 2025, by and among Omnicom Management Inc., Omnicom Group Inc., and John D. Wren.

Exhibit 10.1 AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (the “Agreement”) dated as of May 12, 2025, by and among Omnicom Management Inc. (the “Company”), Omnicom Group Inc. (“OGI”) and John D. Wren (the “Executive”). W I T N E S S E T H: WHEREAS, the Board of Directors of OGI have determined that it is in OGI’s best interests to enter into an Amended a

May 9, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2025 OMNICOM GROUP INC.

April 16, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2025 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified i

April 15, 2025 EX-99.1

OMNICOM REPORTS FIRST QUARTER 2025 RESULTS

OMNICOM REPORTS FIRST QUARTER 2025 RESULTS 2025 First Quarter: •Revenue of $3.7 billion, with organic growth of 3.4% •Net income of $287.7 million •Diluted earnings per share of $1.45; $1.70 Non-GAAP adjusted •Operating income of $452.6 million; Non-GAAP Adj. EBITA of $508.2 million with 13.8% margin NEW YORK, April 15, 2025 - Omnicom (NYSE: OMC) today announced results for the quarter ended March

April 15, 2025 EX-99.2

2025 First Quarter April 15, 2025 2 Highlights Revenue • Q1 2025 organic revenue growth of +3.4% • Led by strong growth in Media & Advertising and Precision Marketing (together 68% of revenue growing +7.0% organic) Income • Q1 operating income, exclu

2025 First Quarter April 15, 2025 2 Highlights Revenue • Q1 2025 organic revenue growth of +3.

April 15, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 15, 2025 OMNICOM GROUP INC.

March 27, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) þ Filed by the Registrant o Filed by a party other than the Registrant Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

March 27, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defin

March 19, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 18, 2025 OMNICOM GROUP INC.

March 14, 2025 EX-99.1

Omnicom and Interpublic Receive Second Request from the U.S. Federal Trade Commission

Exhibit 99.1 Omnicom and Interpublic Receive Second Request from the U.S. Federal Trade Commission NEW YORK, March 13, 2025 – Omnicom (NYSE: OMC) and Interpublic (NYSE: IPG) today announced that the companies have each received a Request for Additional Information and Documentary Material (Second Request) from the U.S. Federal Trade Commission (FTC) in connection with Omnicom’s proposed acquisitio

March 14, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 12, 2025 OMNICOM GROUP INC. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 12, 2025 OMNICOM GROUP INC.

March 14, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 12, 2025 OMNICOM GROUP INC.

March 7, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 7, 2025 OMNICOM GROUP INC.

March 7, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 7, 2025 OMNICOM GROUP INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 7, 2025 OMNICOM GROUP INC.

March 5, 2025 425

Filed by: Omnicom Group Inc.

Filed by: Omnicom Group Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: The Interpublic Group of Companies, Inc. SEC File No.: 001-06686 The following is a transcript of Philip J. Angelastro’s pertinent remarks at the Morgan Stanley Technology, Media & Telecom Conference on March 4, 2025.

February 5, 2025 EX-19

“Insider Trading” Section of Omnicom Group Inc. Code of Business Conduct.

Insider Trading We protect nonpublic information, never using it for personal gain.

February 5, 2025 EX-10.8

Omnicom Group Inc. SERCR Plan Amended and Restated Form of Award Agreement.

Exhibit 10.8 Omnicom Group Inc. Senior Executive Restrictive Covenant and Retention Plan Amended and Restated Award Agreement THIS AMENDED AND RESTATED AWARD AGREEMENT (this “Agreement”), is entered into as of the day of , 2024 (the “Effective Date”), by and between Omnicom Group Inc., a New York corporation (the “Company”), and (“Executive”). WITNESSETH: WHEREAS, Executive continues to be employe

February 5, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 Commission File Number: 1-10551 OMNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2024 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization

February 5, 2025 EX-10.25

Director Compensation and Deferred Stock Program (As amended, effective January 1, 2025).

EXHIBIT 10.25 OMNICOM GROUP INC. DIRECTOR COMPENSATION AND DEFERRED STOCK PROGRAM (AS AMENDED, EFFECTIVE JANUARY 1, 2025) 1.Purpose. The purpose of the Omnicom Group Inc. Director Compensation and Deferred Stock Program (the “Program”) is to promote the success and enhance the value of Omnicom Group Inc. (the “Company”) by linking the personal interests of the members of the Board of Directors of

February 5, 2025 425

OMC Q4 2024 Earnings Call February 4, 2025

Filed by: Omnicom Group Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: The Interpublic Group of Companies, Inc. SEC File No.: 001-06686 The following is a transcript of an earnings conference call hosted by Omnicom Group Inc. on February 4, 2025. OMC Q4 2024 Earnings Call February 4, 202

February 5, 2025 EX-21

Subsidiaries of the Registrant.

EXHIBIT 21 SUBSIDIARIES OF REGISTRANT Significant Subsidiaries Company Jurisdiction of Incorporation Percentage of Voting Securities Owned by Registrant Number of US subsidiaries Number of Non-US subsidiaries Omnicom APIMA Holdings Limited Hong Kong 100% — 64 Omnicom Capital Inc.

February 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 4, 2025 OMNICOM GROUP INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 4, 2025 OMNICOM GROUP INC.

February 4, 2025 EX-99.1

OMNICOM REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS

OMNICOM REPORTS FOURTH QUARTER AND FULL YEAR 2024 RESULTS 2024 Fourth Quarter: •Revenue of $4.

February 4, 2025 EX-99.2

2024 Fourth Quarter & Full Year February 4, 2025 2 Highlights Revenue • Q4 2024 organic revenue growth +5.2% year-over- year • Led by strong growth in Media & Advertising across all geographies, particularly in the U.S. Income • Q4 operating income +

a2024q4investorpresentat 2024 Fourth Quarter & Full Year February 4, 2025 2 Highlights Revenue • Q4 2024 organic revenue growth +5.

January 30, 2025 424B3

JOINT LETTER TO STOCKHOLDERS OF OMNICOM GROUP INC. AND STOCKHOLDERS OF THE INTERPUBLIC GROUP OF COMPANIES, INC.

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-284358 JOINT LETTER TO STOCKHOLDERS OF OMNICOM GROUP INC. AND STOCKHOLDERS OF THE INTERPUBLIC GROUP OF COMPANIES, INC. Dear Stockholders: On behalf of the boards of directors of Omnicom Group Inc. (“Omnicom”) and The Interpublic Group of Companies, Inc. (“IPG”), we are pleased to enclose this joint proxy statement/prospectus r

January 29, 2025 EX-99.2

Form of The Interpublic Group of Companies, Inc. Proxy Card.

Exhibit 99.2 THE INTERPUBLIC GROUP OF COMPANIES, INC. 909 THIRD AVENUE NEW YORK, NY 10022 SCAN TO VIEW MATERIALS & VOTE VOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com or scan the QR Barcode above Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 p.m. Eastern Time the day before the cut-off date or meeting date. Have your

January 29, 2025 EX-99.4

Consent of Morgan Stanley & Co. LLC.

Exhibit 99.4 Consent of Morgan Stanley & Co. LLC We hereby consent to the use in Amendment No. 1 to the Registration Statement of Omnicom Group Inc. (“Omnicom”) on Form S-4 (the “Registration Statement”) and in the related joint proxy statement/prospectus, which is part of the Registration Statement, of our written opinion, dated December 8, 2024, appearing as Annex C to the joint proxy statement/

January 29, 2025 EX-99.3

Consent of PJT Partners LP

Exhibit 99.3 January 29, 2025 Omnicom Group Inc. 280 Park Avenue New York, NY 10017 Re: Amendment No. 1 to Registration Statement on Form S-4 (No. 333-284358) of Omnicom Group Inc. (the “Company”) relating to shares of common stock, par value $0.15 per share, of the Company filed on January 29, 2025 (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dated

January 29, 2025 S-4/A

As filed with the U.S. Securities and Exchange Commission on January 29, 2025

Table of Contents As filed with the U.S. Securities and Exchange Commission on January 29, 2025 Registration No. 333-284358 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Omnicom Group Inc. (Exact Name of Registrant as Specified in Its Charter) New York 7311 13-1514814 (State of Incorporati

January 29, 2025 EX-99.1

Form of Omnicom Group Inc. Proxy Card.

Exhibit 99.1 SCAN TO VIEW MATERIALS & VOTE w OMNICOM GROUP INC. VOTE BY INTERNET 280 PARK AVENUE, Before The Meeting—Go to www.proxyvote.com or scan the QR Barcode above NEW YORK, NY 10017 Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 p.m. Eastern Time on March 17, 2025, or, for shares held in Omnicom employee plans, 11:59 p.m. East

January 28, 2025 CORRESP

January 28, 2025

January 28, 2025 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Trade & Services 100 F Street, N.

January 17, 2025 EX-99.3

Consent of PJT Partners LP

Exhibit 99.3 January 17, 2025 Omnicom Group Inc. 280 Park Avenue New York, NY 10017 Re: Initially Filed Registration Statement on Form S-4 of Omnicom Group Inc. (the “Company”) relating to shares of common stock, par value $0.15 per share, of the Company filed on January 17, 2025 (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dated December 8, 2024 (“

January 17, 2025 S-4

As filed with the U.S. Securities and Exchange Commission on January 17, 2025

Table of Contents As filed with the U.S. Securities and Exchange Commission on January 17, 2025 Registration No. 333-     UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Omnicom Group Inc. (Exact Name of Registrant as Specified in Its Charter) New York 7311 13-1514814 (State of Incorporation) (Primary Standard

January 17, 2025 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Table Form S-4 (Form Type) Omnicom Group Inc.

January 17, 2025 EX-99.4

Consent of Morgan Stanley & Co. LLC.

EX-99.4 Exhibit 99.4 Consent of Morgan Stanley & Co. LLC We hereby consent to the use in the Registration Statement of Omnicom Group Inc. (“Omnicom”) on Form S-4 (the “Registration Statement”) and in the related joint proxy statement/prospectus, which is part of the Registration Statement, of our written opinion, dated December 8, 2024, appearing as Annex C to the joint proxy statement/prospectus,

December 9, 2024 425

Filed by: Omnicom Group Inc.

Filed by: Omnicom Group Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: The Interpublic Group of Companies, Inc. SEC File No.: 001-06686 The following email was sent by John Wren, Chairman and Chief Executive Officer of Omnicom Group Inc., to Omnicom employees on December 9, 2024. Subject

December 9, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 9, 2024 OMNICOM GROUP INC.

December 9, 2024 EX-2.1

Agreement and Plan of Merger among Omnicom Group, Inc., EXT Subsidiary Inc. and The Interpublic Group of Companies, Inc., dated as of December 8, 2024 (Exhibit 2.1 to our Current Report on Form 8-K (File No. 1-10551) filed on December 9, 2024 and incorporated herein by reference).

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER among OMNICOM GROUP INC. EXT SUBSIDIARY INC. and THE INTERPUBLIC GROUP OF COMPANIES, INC. Dated as of December 8, 2024 TABLE OF CONTENTS Page ARTICLE 1 THE MERGER 1 1.1 The Merger 1 1.2 Closing 2 1.3 Effective Time 2 1.4 Charter and Bylaws 2 1.5 Directors and Officers of the Surviving Corporation 2 1.6 Directors and Officers of Omnicom 2 ARTICLE 2 CONVERSIO

December 9, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 8, 2024 OMNICOM GROUP INC.

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 8, 2024 OMNICOM GROUP INC.

December 9, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 8, 2024 OMNICOM GROUP INC.

December 9, 2024 425

Omnicom to Acquire Interpublic Group to Create Premier Marketing and Sales Company

Filed by: Omnicom Group Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: The Interpublic Group of Companies, Inc. SEC File No.: 001-06686 The following email was sent by John Wren, Chairman and Chief Executive Officer of Omnicom Group Inc., to certain Omnicom clients on December 9, 2024. J

December 9, 2024 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 9, 2024 OMNICOM GROUP INC.

425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): December 9, 2024 OMNICOM GROUP INC.

December 9, 2024 425

Filed by: Omnicom Group Inc.

Filed by: Omnicom Group Inc. pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934 Subject Company: The Interpublic Group of Companies, Inc. SEC File No.: 001-06686 The following is the transcript of an Omnicom Group Inc. and The Interpublic Group of Companies, Inc. joint investor presentation on December 9, 2024. C

December 9, 2024 EX-99.2

Marketing & Sales Leader for a New Era December 9, 2024

Exhibit 99.2 Marketing & Sales Leader for a New Era December 9, 2024 2 FORWARD-LOOKING STATEMENTS This communication contains certain “forward-looking statements” within the meaning of federal securities laws. Forward-looking statements may be identified by words such as “anticipates,” “believes,” “could,” “continue,” “estimate,” “expects,” “intends,” “will,” “should,” “may,” “plan,” “predict,” “p

December 9, 2024 EX-99.1

Omnicom to Acquire Interpublic Group to Create Premier Marketing and Sales Company

Exhibit 99.1 Omnicom to Acquire Interpublic Group to Create Premier Marketing and Sales Company • The combined company will bring together unmatched capabilities, including the industry’s deepest bench of marketing talent, and the broadest and most innovative services and products, underpinned by the most advanced sales and marketing platform • Together, Omnicom and Interpublic will be strongly po

November 8, 2024 SC 13G

OMC / Omnicom Group Inc. / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Omnicom Group Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 681919106 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to des

November 8, 2024 EX-99

JOINT FILING AGREEMENT

EX-99 2 Rule13DJointFilingAgreement.htm JOINT FILING AGREEMENT JOINT FILING AGREEMENT The undersigned hereby agree that this Schedule 13G (the “Schedule 13G”) with respect to the common stock of Omnicom Group Inc. is, and any additional amendment thereto signed by each of the undersigned shall be, filed on behalf of each undersigned pursuant to and in accordance with the provisions of 13d-1(k) und

October 21, 2024 EX-FILING FEES

Filing Fee Table

Ex-Filing Fees CALCULATION OF FILING FEE TABLES S-3 Omnicom Group Inc. Table 1: Newly Registered and Carry Forward Securities Line Item Type Security Type Security Class Title Notes Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to be Paid Debt Debt Securities of O

October 21, 2024 EX-25.3

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Capital Holdings Indenture

Exhibit 25.3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact name of trustee as specifi

October 21, 2024 EX-25.1

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Group Inc. Indenture

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact name of trustee as specifi

October 21, 2024 S-3ASR

As filed with the Securities and Exchange Commission on October 21, 2024

As filed with the Securities and Exchange Commission on October 21, 2024 Registration No.

October 21, 2024 EX-25.2

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Finance Holdings Indenture

Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact name of trustee as specifi

October 21, 2024 EX-4.17

Description of Securities (Exhibit 4.17 to our Registration Statement on Form S-3ASR (File No. 333-282748) filed on October 21, 2024 and incorporated herein by reference).

Exhibit 4.17 Description of Securities Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 We have five classes of securities registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (i) our common stock, par value $.15 per share (the “common stock”), (ii) the 0.800% Senior Notes due 2027 (the “2027 notes”) issued by

October 21, 2024 EX-4.3

Form of Indenture among Omnicom Group Inc., as issuer, and Deutsche Bank Trust Company Americas, as trustee (the “Omnicom Group Inc. Indenture”)

Exhibit 4.3 OMNICOM GROUP INC. as Issuer INDENTURE Dated as of DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 SECTION 1.1 Definitions 1 SECTION 1.2 Other Definitions 5 SECTION 1.3 Incorporation by Reference of Trust Indenture Act 5 SECTION 1.4 Rules of Construction 5 ARTICLE II THE SECURITIES 6 SECTION 2

October 18, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): October 17, 2024 OMNICOM GROUP INC.

October 18, 2024 EX-3.1

By-Laws of Omnicom Group Inc., as amended and restated on October 17, 2024 (Exhibit 3.1 to Omnicom’s Current Report on Form 8-K (File No. 1-10551) dated October 18, 2024 and incorporated herein by reference).

Exhibit 3.1 BY-LAWS OF OMNICOM GROUP INC. A NEW YORK CORPORATION (AS AMENDED AND RESTATED OCTOBER 17, 2024) Article I. MEETINGS OF SHAREHOLDERS Section 1. Place of Meetings. All meetings of the shareholders of Omnicom Group Inc. (the “Corporation”) will be held at such places, within or outside of the State of New York, as may be fixed from time to time by the Board of Directors of the Corporation

October 16, 2024 SC 13G/A

OMC / Omnicom Group Inc. / STATE STREET CORP Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* OMNICOM GROUP INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 681919106 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

October 16, 2024 EX-10.1

2021 Incentive Award Plan – Performance Restricted Stock Unit Agreement - Form of Grant Notice and Agreement.

EXHIBIT 10.1 OMNICOM GROUP INC. 2021 INCENTIVE AWARD PLAN PERFORMANCE RESTRICTED STOCK UNIT AGREEMENT GRANT NOTICE Unless otherwise defined herein, the terms defined in the Omnicom Group Inc. 2021 Incentive Award Plan (as amended, restated or otherwise modified from time to time, the “Plan”) shall have the same defined meanings in this Grant Notice (the “Grant Notice”) and the Performance Restrict

October 16, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2024 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specifi

October 15, 2024 EX-99.2

2024 Third Quarter October 15, 2024 2 Highlights Revenue • 6.5% organic revenue growth and +2.1% from net acquisitions/dispositions in Q3 2024 • Led by Advertising & Media (+9.4%), Experiential (+35.3%), and Public Relations (+4.3%) Income • 7.0% gro

2024 Third Quarter October 15, 2024 2 Highlights Revenue • 6.5% organic revenue growth and +2.1% from net acquisitions/dispositions in Q3 2024 • Led by Advertising & Media (+9.4%), Experiential (+35.3%), and Public Relations (+4.3%) Income • 7.0% growth in Operating Income, and 7.9% growth in Adjusted EBITA in Q3 2024 with a 16.0% margin(i) • 4.8% growth in diluted EPS to $1.95, and 5.7% growth in

October 15, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 15, 2024 OMNICOM GROUP INC.

October 15, 2024 EX-99.1

OMNICOM REPORTS THIRD QUARTER 2024 RESULTS Revenue of $3.9 billion, with organic growth of 6.5% Net income of $385.9 million Diluted earnings per share of $1.95; $2.03 Non-GAAP adjusted Operating income of $600.1 million; EBITA of $622.3 million and

OMNICOM REPORTS THIRD QUARTER 2024 RESULTS Revenue of $3.9 billion, with organic growth of 6.5% Net income of $385.9 million Diluted earnings per share of $1.95; $2.03 Non-GAAP adjusted Operating income of $600.1 million; EBITA of $622.3 million and 16.0% margin NEW YORK, October 15, 2024 - Omnicom (NYSE: OMC) today announced results for the quarter ended September 30, 2024. "Omnicom delivered a s

August 2, 2024 EX-1.1

Underwriting Agreement, dated July 30, 2024, among Omnicom Group Inc., BofA Securities, Inc., Citigroup Global Markets Inc., Deutsche Bank Securities Inc., and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein

Exhibit 1.1 Omnicom Group Inc. 5.300% Senior Notes due 2034 Underwriting Agreement July 30, 2024 To the Representatives named in Schedule I hereto of the several Underwriters named in Schedule II hereto Ladies and Gentlemen: Omnicom Group Inc., a New York corporation, (the “Company”), proposes to sell to the several underwriters named in Schedule II hereto (the “Underwriters”), for whom you (the “

August 2, 2024 EX-4.1

Fourth Supplemental Indenture, dated as of August 2, 2024, among Omnicom Group Inc., as issuer, and Deutsche Bank Trust Company Americas, as trustee

Exhibit 4.1 OMNICOM GROUP INC. as Issuer FOURTH SUPPLEMENTAL INDENTURE Dated as of August 2, 2024 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities Fourth Supplemental Indenture dated as of August 2, 2024 (the “Fourth Supplemental Indenture”) between Omnicom Group Inc., a New York corporation (the “Issuer”) and Deutsche Bank Trust Company Americas, a New York banking corporation, as

August 2, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 30, 2024 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction of incorporation) (Commission File Num

July 31, 2024 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 Omnicom Group Inc. Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date F

July 31, 2024 424B2

Price to Public(1)

Filed pursuant to Rule 424(b)(2) Registration No. 333-261046 Prospectus Supplement (to prospectus dated November 12, 2021) OMNICOM GROUP INC. $600,000,000 5.300% Senior Notes due 2034 Issue price: 99.670% Interest payable May 1 and November 1 The 5.300% Senior Notes due 2034 (the “notes”) will be issued by Omnicom Group Inc. (the “Issuer”). The notes will bear interest at the rate of 5.300% per an

July 30, 2024 424B2

SUBJECT TO COMPLETION, DATED JULY 30, 2024

Filed pursuant to Rule 424(b)(2) Registration No. 333-261046 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities, and they are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not permitted. SUBJECT

July 30, 2024 FWP

Omnicom Group Inc. $600,000,000 5.300% Senior Notes due 2034 Pricing Term Sheet July 30, 2024

Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Registration Statement No.

July 17, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

July 16, 2024 EX-99.1

OMNICOM REPORTS SECOND QUARTER 2024 RESULTS Revenue of $3.9 billion, with organic growth of 5.2% Net income of $328.1 million Diluted earnings per share of $1.65; $1.95 Non-GAAP adjusted Non-GAAP adjusted EBITA of $589.6 million and 15.3% margin

OMNICOM REPORTS SECOND QUARTER 2024 RESULTS Revenue of $3.9 billion, with organic growth of 5.2% Net income of $328.1 million Diluted earnings per share of $1.65; $1.95 Non-GAAP adjusted Non-GAAP adjusted EBITA of $589.6 million and 15.3% margin NEW YORK, July 16, 2024 - Omnicom (NYSE: OMC) today announced results for the quarter ended June 30, 2024. "Our 5.2% organic growth in the second quarter

July 16, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 16, 2024 OMNICOM GROUP INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 16, 2024 OMNICOM GROUP INC.

July 16, 2024 EX-99.2

2024 Second Quarter July 16, 2024 2 Highlights Revenue • 5.2% organic revenue growth in Q2 2024, 4.6% YTD, solidly within annual expectation of 4.0%-5.0% • Advertising & Media strong at +7.8% • +2.6% benefit from net acquisitions & dispositions Incom

2024 Second Quarter July 16, 2024 2 Highlights Revenue • 5.2% organic revenue growth in Q2 2024, 4.6% YTD, solidly within annual expectation of 4.0%-5.0% • Advertising & Media strong at +7.8% • +2.6% benefit from net acquisitions & dispositions Income • Q2 2024 reported operating income $510.3 million, 13.2% margin. Non-GAAP adjusted EBITA $589.6 million, increase of 5.5% from prior year and a 15.

June 27, 2024 EX-25

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Omnicom Group Retirement Savings Plan New York, New York We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No.

June 27, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: OMNICOM GROUP RETIREMENT SAVINGS PLAN B. Name of issuer of the securities held pursuant to

May 13, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 7, 2024 OMNICOM GROUP INC.

April 17, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2024 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified i

April 16, 2024 EX-99.1

OMNICOM REPORTS FIRST QUARTER 2024 RESULTS Revenue of $3.6 billion, with organic growth of 4.0% Diluted earnings per share of $1.59; $1.67 Non-GAAP adjusted Operating income of $478.9 million and 13.2% margin EBITA of $500.4 million and 13.8% margin

OMNICOM REPORTS FIRST QUARTER 2024 RESULTS Revenue of $3.6 billion, with organic growth of 4.0% Diluted earnings per share of $1.59; $1.67 Non-GAAP adjusted Operating income of $478.9 million and 13.2% margin EBITA of $500.4 million and 13.8% margin NEW YORK, April 16, 2024 - Omnicom (NYSE: OMC) today announced results for the quarter ended March 31, 2024. "Omnicom began the year with solid organi

April 16, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 16, 2024 OMNICOM GROUP INC.

April 16, 2024 EX-99.2

2024 First Quarter April 16, 2024 2 Highlights Revenue • 4.0% organic revenue growth in Q1 2024 • Advertising & Media +7.0%, Precision Marketing +4.3% in Q1 2024 • Tailwind of +1.5% in Q1 2024 from net acquisitions & dispositions Income • Operating i

2024 First Quarter April 16, 2024 2 Highlights Revenue • 4.0% organic revenue growth in Q1 2024 • Advertising & Media +7.0%, Precision Marketing +4.3% in Q1 2024 • Tailwind of +1.5% in Q1 2024 from net acquisitions & dispositions Income • Operating income $478.9 million (13.2% margin). EBITA $500.4 million (13.8% margin) +4.1% from prior year non-GAAP adjusted EBITA(i) • Reported diluted EPS of $1

March 28, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 28, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defin

March 6, 2024 8-A12B

Omnicom Group Inc. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Omnicom Group Inc. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 280

March 6, 2024 EX-4.1

ase Indenture, dated as of March 6, 2024, among Omnicom Finance Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee (Exhibit 4.1 to our current report on Form 8-K (File No, 1-10551) dated March 6, 2024 and incorporated herein by reference).

Exhibit 4.1 OMNICOM FINANCE HOLDINGS PLC, as Issuer OMNICOM GROUP INC., as Guarantor INDENTURE Dated as of March 6, 2024 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities Table of Contents Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 SECTION 1.1 Definitions 1 SECTION 1.2 Other Definitions 6 SECTION 1.3 Incorporation by Reference of Trust Indenture Act 6 SECTION 1.4 Rul

March 6, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 6, 2024 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction of incorporation) (Commission File Num

March 6, 2024 EX-4.2

First Supplemental Indenture, dated as of March 6, 2024, among Omnicom Finance Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee

Exhibit 4.2 OMNICOM FINANCE HOLDINGS PLC as Issuer OMNICOM GROUP INC. as Guarantor FIRST SUPPLEMENTAL INDENTURE Dated as of March 6, 2024 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities First Supplemental Indenture dated as of March 6, 2024 (the “First Supplemental Indenture”) among Omnicom Finance Holdings plc, a public limited company organized under the laws of England and Wales

February 29, 2024 EX-1.1

Underwriting Agreement, dated February 28, 2024, among Omnicom Finance Holdings plc, Omnicom Group Inc., Barclays Bank PLC, BNP Paribas, HSBC Bank plc and J.P. Morgan Securities plc, as representatives of the several underwriters, and the other underwriters named therein

Exhibit 1.1 Omnicom Finance Holdings plc 3.700% Senior Notes due 2032 Underwriting Agreement February 28, 2024 To the Representatives named in Schedule I hereto of the several Underwriters named in Schedule II hereto Ladies and Gentlemen: Omnicom Finance Holdings plc, a public limited company organized under the laws of England and Wales (the “Issuer”), proposes to sell to the several underwriters

February 29, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 28, 2024 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction (Commission File Number) (IRS Empl

February 29, 2024 424B2

Price to Public(1)

Prospectus Supplement (to prospectus dated November 12, 2021) Filed pursuant to Rule 424(b)(2) Registration No.

February 29, 2024 EX-FILING FEES

CALCULATION OF FILING FEE TABLE Form S-3 (Form Type) Omnicom Finance Holdings plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered

Exhibit 107 CALCULATION OF FILING FEE TABLE Form S-3 (Form Type) Omnicom Finance Holdings plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered The prospectus supplement to which this Exhibit is attached is a final prospectus for the related offering.

February 28, 2024 FWP

Omnicom Finance Holdings plc €600,000,000 3.700% Senior Notes due 2032 Pricing Term Sheet €600,000,000 3.700% Senior Notes due 2032

Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Registration Statement No.

February 28, 2024 424B2

SUBJECT TO COMPLETION, DATED FEBRUARY 28, 2024

The information in this preliminary prospectus supplement is not complete and may be changed.

February 13, 2024 SC 13G/A

OMC / Omnicom Group Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: Omnicom Group Inc Title of Class of Securities: Common Stock CUSIP Number: 681919106 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ 

February 7, 2024 EX-97

Omnicom Group Inc. Clawback Policy

EXHIBIT 97 OMNICOM GROUP INC. CLAWBACK POLICY Omnicom Group Inc. (the “Company”) has adopted this Clawback Policy (the “Clawback Policy”), effective as of December 1, 2023. Capitalized terms used in this Clawback Policy but not otherwise defined herein are defined in Section 11. 1.Persons Subject to Clawback Policy This Clawback Policy shall apply to current and former Officers of the Company and

February 7, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 Commission File Number: 1-10551 OMNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2023 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization

February 7, 2024 EX-10.6

Senior Management Incentive Plan as amended and restated on December 12, 2023.

Exhibit 10.6 OMNICOM GROUP INC. SENIOR MANAGEMENT INCENTIVE PLAN As Amended and Restated on December 12, 2023 Section 1.Purposes. The purpose of the Omnicom Group Inc. Senior Management Incentive Plan (the “Plan”) is to attract, retain and motivate selected employees of Omnicom Group Inc. (the “Company”) and its subsidiaries and affiliates who are executive officers of the Company (and any success

February 7, 2024 EX-21

Subsidiaries of the Registrant.

EXHIBIT 21 SUBSIDIARIES OF REGISTRANT Significant Subsidiaries Company Jurisdiction of Incorporation Percentage of Voting Securities Owned by Registrant Number of US subsidiaries Number of Non-US subsidiaries Omnicom APIMA Holdings Limited Hong Kong 100% — 65 Omnicom Capital Inc.

February 6, 2024 EX-99.2

2023 Fourth Quarter & Full Year February 6, 2024 2 Highlights Revenue • 4.4% organic revenue growth in Q4 2023 • Advertising & Media, led by the performance of our global media businesses, had 9.3% organic growth in Q4 2023 • Full-year 2024 total org

2023 Fourth Quarter & Full Year February 6, 2024 2 Highlights Revenue • 4.4% organic revenue growth in Q4 2023 • Advertising & Media, led by the performance of our global media businesses, had 9.3% organic growth in Q4 2023 • Full-year 2024 total organic revenue growth estimated to be 3.5% to 5.0% Income • Adjusted operating income $661.2 million, up 2.9% yr/yr in Q4. Adjusted EBITA $682.6 million

February 6, 2024 EX-99.1

OMNICOM REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS 2023 Fourth Quarter: Revenue of $4,060.9 million, with organic growth of 4.4% Operating income of $646.7 million; $661.2 million non-GAAP adjusted Operating income margin of 15.9%; 16.3% non-G

OMNICOM REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS 2023 Fourth Quarter: Revenue of $4,060.

February 6, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 6, 2024 OMNICOM GROUP INC.

January 5, 2024 EX-10.1

Delayed Draw Term Loan Agreement, dated as of January 3, 2024, among Omnicom Capital Inc., a Connecticut corporation, Omnicom Group Inc., a New York corporation, the initial lenders named therein, Citibank, N.A., BofA Securities, Inc., Barclays Bank PLC, BNP Paribas Securities Corp., Deutsche Bank Securities Inc., HSBC Securities (USA), Inc., JPMorgan Chase Bank, N.A., Mizuho Bank, Ltd., Société Générale, Sumitomo Mitsui Banking Corporation, TD Securities (USA), LLC, U.S. Bank National Association and Wells Fargo Securities, LLC, as lead arrangers and book managers, and Citibank, N.A., as administrative agent for the lenders (Exhibit 10.1 to our Current Report on Form 8-K (File No. 1-10551) dated January 5, 2024 and incorporated herein by reference).

Exhibit 10.1 EXECUTION COPY U.S. $600,000,000 DELAYED DRAW TERM LOAN AGREEMENT Dated as of January 3, 2024 Among OMNICOM CAPITAL INC. as Borrower OMNICOM GROUP INC. as Guarantor THE INITIAL LENDERS NAMED HEREIN as Initial Lenders CITIBANK, N.A., BOFA SECURITIES, INC., BARCLAYS BANK PLC, BNP PARIBAS SECURITIES CORP., DEUTSCHE BANK SECURITIES INC., HSBC SECURITIES (USA), INC., JPMORGAN CHASE BANK, N

January 5, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 3, 2024 OMNICOM GROUP INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 3, 2024 OMNICOM GROUP INC.

December 18, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 12, 2023 OMNICOM GROUP INC.

December 18, 2023 EX-99.1

Omnicom Appoints Casey Santos to Board of Directors

Exhibit 99.1 Omnicom Appoints Casey Santos to Board of Directors NEW YORK, Dec. 18, 2023 — Omnicom (NYSE: OMC) today announced that Casey Santos has been appointed as an independent director to its Board of Directors and as a member of the Finance Committee, effective January 1, 2024. “We are thrilled to welcome Casey to our esteemed Board of Directors, which is known for the diverse perspectives

October 18, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specifi

October 17, 2023 EX-99.2

2023 Third Quarter October 17, 2023 2 Third Quarter Highlights Revenue – 3.3% organic revenue growth in Q3 2023, 4.0% YTD, in line with full-year expectations – Strong organic growth rates in Advertising & Media, Precision Marketing, and Healthcare d

2023 Third Quarter October 17, 2023 2 Third Quarter Highlights Revenue – 3.3% organic revenue growth in Q3 2023, 4.0% YTD, in line with full-year expectations – Strong organic growth rates in Advertising & Media, Precision Marketing, and Healthcare disciplines Income – 15.7% operating income margin – 16.2% EBITA margin – 5.1% growth in Q3 diluted EPS, 7.9% growth YTD Non-GAAP adjusted diluted EPS

October 17, 2023 EX-99.1

OMNICOM REPORTS THIRD QUARTER 2023 RESULTS Revenue of $3,578.1 million, with organic growth of 3.3% Operating income of $560.8 million Operating income margin of 15.7% Diluted earnings per share of $1.86

OMNICOM REPORTS THIRD QUARTER 2023 RESULTS Revenue of $3,578.1 million, with organic growth of 3.3% Operating income of $560.8 million Operating income margin of 15.7% Diluted earnings per share of $1.86 NEW YORK, October 17, 2023 - Omnicom (NYSE: OMC) today announced results for the quarter ended September 30, 2023. "We are pleased with our strong organic revenue growth of 3.3%, with notable perf

October 17, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 17, 2023 OMNICOM GROUP INC.

July 19, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2023 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

July 18, 2023 EX-99.1

OMNICOM REPORTS SECOND QUARTER 2023 RESULTS Revenue of $3,609.9 million, with organic growth of 3.4% Operating income of $550.7 million Operating income margin of 15.3% Diluted earnings per share of $1.82

OMNICOM REPORTS SECOND QUARTER 2023 RESULTS Revenue of $3,609.9 million, with organic growth of 3.4% Operating income of $550.7 million Operating income margin of 15.3% Diluted earnings per share of $1.82 NEW YORK, July 18, 2023 - Omnicom (NYSE: OMC) today announced results for the quarter ended June 30, 2023. "Organic revenue grew 3.4% in the second quarter and 4.3% year-to-date, placing us comfo

July 18, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 18, 2023 OMNICOM GROUP INC.

July 18, 2023 EX-99.2

2023 Second Quarter July 18, 2023 2 Second Quarter Highlights Revenue – 3.4% organic revenue growth in 2Q23, 4.3% YTD on track with full-year expectation of 3%-5% – Key disciplines performing solidly despite challenging macroeconomic conditions Incom

a2023q2investorpresentat 2023 Second Quarter July 18, 2023 2 Second Quarter Highlights Revenue – 3.

June 28, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: OMNICOM GROUP RETIREMENT SAVINGS PLAN B. Name of issuer of the securities held pursuant to

June 5, 2023 EX-10.1

Third Amended and Restated Five Year Credit Agreement, dated as of June 2, 2023, by and among Omnicom Capital Inc., a Connecticut corporation, Omnicom Finance Limited, a private limited company organized under the laws of England and Wales, Omnicom Group Inc., a New York corporation, any other subsidiary of Omnicom Group Inc. designated for borrowing privileges, the banks, financial institutions and other institutional lenders and initial issuing banks listed on the signature pages thereof, Citibank, N.A., JPMorgan Chase Bank, N.A., and Wells Fargo Securities, LLC, as lead arrangers and book managers, JPMorgan Chase Bank, N.A. and Wells Fargo Bank, National Association, as syndication agents, Bank of America, N.A., BNP Paribas, Barclays Bank PLC, Deutsche Bank Securities Inc. and HSBC Bank USA, National Association, as documentation agents, and Citibank, N.A., as administrative agent for the lenders (Exhibit 10.1 to our Current Report on Form 8-K (File No. 1-10551) dated June 5, 2023 and incorporated herein by reference)

Exhibit 10.1 EXECUTION COPY U.S. $2,500,000,000 THIRD AMENDED AND RESTATED FIVE YEAR CREDIT AGREEMENT Dated as of June 2, 2023 Among OMNICOM CAPITAL INC. and OMNICOM FINANCE LIMITED as Borrowers OMNICOM GROUP INC. as Guarantor THE INITIAL LENDERS NAMED HEREIN as Initial Lenders CITIBANK, N.A., JPMORGAN CHASE BANK, N.A. and WELLS FARGO SECURITIES, LLC as Lead Arrangers and Book Managers JPMORGAN CH

June 5, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 2, 2023 OMNICOM GROUP INC.

May 8, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 2, 2023 OMNICOM GROUP INC. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 2, 2023 OMNICOM GROUP INC.

April 19, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2023 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified i

April 18, 2023 EX-99.1

OMNICOM GROUP REPORTS FIRST QUARTER 2023 RESULTS Revenue of $3,443.3 million, with organic growth of 5.2% Operating income of $346.5 million, $465.7 million Non-GAAP adjusted Operating income margin of 10.1%, 13.5% Non-GAAP adjusted Diluted earnings

OMNICOM GROUP REPORTS FIRST QUARTER 2023 RESULTS Revenue of $3,443.3 million, with organic growth of 5.2% Operating income of $346.5 million, $465.7 million Non-GAAP adjusted Operating income margin of 10.1%, 13.5% Non-GAAP adjusted Diluted earnings per share of $1.11, $1.56 Non-GAAP adjusted NEW YORK, April 18, 2023 - Omnicom Group Inc. (NYSE: OMC) today announced results for the quarter ended Ma

April 18, 2023 EX-99.2

2023 First Quarter April 18, 2023 2 First Quarter Highlights Revenue – 5.2% organic revenue growth – Broad-based growth across disciplines and geographies – On track to achieve full-year expectation of 3%-5% organic revenue growth Income – 13.5% Non-

a2023q1investorpresentat 2023 First Quarter April 18, 2023 2 First Quarter Highlights Revenue – 5.

April 18, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 18, 2023 OMNICOM GROUP INC. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 18, 2023 OMNICOM GROUP INC.

April 14, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 13, 2023 OMNICOM GROUP INC. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 13, 2023 OMNICOM GROUP INC.

March 23, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☑ Defin

March 23, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

February 9, 2023 SC 13G/A

OMC / Omnicom Group Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01576-omnicomgroupinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Omnicom Group Inc. Title of Class of Securities: Common Stock CUSIP Number: 681919106 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate

February 8, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 Commission File Number: 1-10551 OMNIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization

February 8, 2023 EX-21

Subsidiaries of the Registrant.

EXHIBIT 21 SUBSIDIARIES OF REGISTRANT Significant Subsidiaries Company Jurisdiction of Incorporation Percentage of Voting Securities Owned by Registrant Number of US subsidiaries Number of Non-US subsidiaries Omnicom APIMA Holdings Limited Hong Kong 100% — 64 Omnicom Capital Inc.

February 7, 2023 EX-99.1

OMNICOM GROUP REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS 2022 Fourth Quarter: Revenue of $3,868.2 million, with organic growth of 7.2% Operating profit of $642.7 million Operating profit margin of 16.6% Diluted earnings per share of $2.09

OMNICOM GROUP REPORTS FOURTH QUARTER AND FULL YEAR 2022 RESULTS 2022 Fourth Quarter: Revenue of $3,868.

February 7, 2023 EX-99.2

2022 Fourth Quarter & Full Year February 7, 2023 2 Fourth Quarter Highlights Revenue – 7.2% organic revenue growth – Double-digit organic growth in Precision Marketing, Public Relations, and Experiential – Solid organic growth in every global region

2022 Fourth Quarter & Full Year February 7, 2023 2 Fourth Quarter Highlights Revenue – 7.

February 7, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 7, 2023 ` OMNICOM GROUP INC.

January 6, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 30, 2022 OMNICOM GROUP INC.

October 19, 2022 10-Q

___________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specifi

October 18, 2022 EX-99.1

OMNICOM GROUP REPORTS THIRD QUARTER 2022 RESULTS Revenue of $3,443.4 million, with organic growth of 7.5% Operating profit of $546.0 million Operating profit margin of 15.9% Diluted earnings per share of $1.77

OMNICOM GROUP REPORTS THIRD QUARTER 2022 RESULTS Revenue of $3,443.4 million, with organic growth of 7.5% Operating profit of $546.0 million Operating profit margin of 15.9% Diluted earnings per share of $1.77 NEW YORK, October 18, 2022 - Omnicom Group Inc. (NYSE: OMC) today announced results for the quarter ended September 30, 2022. "Omnicom delivered 7.5% organic revenue growth in the quarter wi

October 18, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 18, 2022 ` OMNICOM GROUP INC.

October 18, 2022 EX-99.2

2022 Third Quarter October 18, 2022 2 Third Quarter Highlights Organic strength continues – 7.5% organic revenue growth – Growth in all disciplines and geographies – Raising organic revenue growth guidance to 8.0% - 8.5% for full-year 2022 Profits in

2022 Third Quarter October 18, 2022 2 Third Quarter Highlights Organic strength continues ? 7.

July 20, 2022 10-Q

___________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

July 19, 2022 EX-99.2

2022 Second Quarter July 19, 2022 2 Second Quarter Highlights Organic strength continues – 11.3% organic revenue growth – Strong across all disciplines & geographies – Precision Marketing (+21.0% organic) is now our third largest discipline, up from

a2022q2investorpresentat 2022 Second Quarter July 19, 2022 2 Second Quarter Highlights Organic strength continues – 11.

July 19, 2022 EX-99.1

OMNICOM GROUP REPORTS SECOND QUARTER 2022 RESULTS Revenue of $3,567.2 million flat, with organic growth of 11.3% Operating profit of $541.6 million Operating profit margin of 15.2% Diluted earnings per share of $1.68

EX-99.1 2 a2022q2earningsrelease.htm EX-99.1 OMNICOM GROUP REPORTS SECOND QUARTER 2022 RESULTS Revenue of $3,567.2 million flat, with organic growth of 11.3% Operating profit of $541.6 million Operating profit margin of 15.2% Diluted earnings per share of $1.68 NEW YORK, July 19, 2022 - Omnicom Group Inc. (NYSE: OMC) today announced results for the quarter ended June 30, 2022. "We performed well o

July 19, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 19, 2022 ` OMNICOM GROUP INC.

June 29, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2021

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2021 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: OMNICOM GROUP RETIREMENT SAVINGS PLAN B. Name of issuer of the securities held pursuant to

May 9, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 3, 2022 OMNICOM GROUP INC.

April 20, 2022 10-Q

___________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2022 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified i

April 20, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEFA14A 1 omc4048531-defa14a.htm DEFINITIVE ADDITIONAL PROXY SOLICITING MATERIALS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confi

April 19, 2022 EX-99.2

2022 First Quarter April 19, 2022 2 First Quarter Highlights Revenue momentum – 11.9% organic revenue growth – Strong organic growth in all disciplines and geographies Profitable growth – Operating profit margin of 13.7%, as adjusted for charges of $

2022 First Quarter April 19, 2022 2 First Quarter Highlights Revenue momentum ? 11.

April 19, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 19, 2022 ` OMNICOM GROUP INC.

April 19, 2022 EX-99.1

OMNICOM GROUP REPORTS FIRST QUARTER 2022 RESULTS Revenue of $3,410.3 million decreased 0.5%, with organic growth of 11.9% Charges arising from the effects of the war in Ukraine of $113.4 million included in Operating Profit Operating profit of $353.0

OMNICOM GROUP REPORTS FIRST QUARTER 2022 RESULTS Revenue of $3,410.3 million decreased 0.5%, with organic growth of 11.9% Charges arising from the effects of the war in Ukraine of $113.4 million included in Operating Profit Operating profit of $353.0 million, $466.4 million Non-GAAP adjusted Operating profit margin of 10.4%, 13.7% Non-GAAP adjusted Diluted earnings per share of $0.83, $1.39 Non-GA

March 24, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEFA14A 1 omc3995631-defa14a.htm DEFINITIVE ADDITIONAL PROXY SOLICITING MATERIALS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confi

March 24, 2022 DEF 14A

DEFINITIVE PROXY STATEMENT

March 24, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 omc3995631-def14a.htm DEFINITIVE PROXY STATEMENT UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the

February 22, 2022 EX-99.1

Omnicom Group Appoints Patricia Salas Pineda and Mark D. Gerstein to Board of Directors

Exhibit 99.1 Omnicom Group Appoints Patricia Salas Pineda and Mark D. Gerstein to Board of Directors NEW YORK, Feb. 22, 2022 - Omnicom Group Inc. (NYSE: OMC) today announced two new members of its Board of Directors. Patricia Salas Pineda has been appointed an independent director and member of the Governance Committee, effective immediately. Mark D. Gerstein has been appointed an independent dire

February 22, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 15, 2022 OMNICOM GROUP INC.

February 10, 2022 SC 13G/A

OMC / Omnicom Group Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01577-omnicomgroupinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Omnicom Group Inc. Title of Class of Securities: Common Stock CUSIP Number: 681919106 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate

February 9, 2022 EX-4.20

Description of Securities

Exhibit 4.20 Description of Securities Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 We have four classes of securities registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?): (i) our common stock, par value $.15 per share (the ?common stock?), (ii) the 0.800% Senior Notes due 2027 (the ?2027 notes?) issued by

February 9, 2022 10-K

______________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2021 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization

February 9, 2022 EX-21

Subsidiaries of the Registrant.

EXHIBIT 21 SUBSIDIARIES OF REGISTRANT Significant Subsidiaries Company Jurisdiction of Incorporation Percentage of Voting Securities Owned by Registrant Number of US subsidiaries Number of Non-US subsidiaries Omnicom APIMA Holdings Limited Hong Kong 100% ? 70 Omnicom Capital Inc.

February 8, 2022 EX-99.1

OMNICOM GROUP REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS Revenue of $3,855.9 million increased 2.6%, with organic growth of 9.5% Operating profit of $622.5 million increased 1.3% Operating profit margin of 16.1% Net income of $416.2 million in

OMNICOM GROUP REPORTS FOURTH QUARTER AND FULL YEAR 2021 RESULTS Revenue of $3,855.

February 8, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 8, 2022 ` OMNICOM GROUP INC.

February 8, 2022 EX-99.2

2021 Fourth Quarter & Full Year February 8, 2022 2 Fourth Quarter Highlights Revenue strength – Revenue growth 2.6% reported, 9.5% organic – Growth across all disciplines and geographies – Strong 19.6% organic growth in Precision Marketing Profitable

2021 Fourth Quarter & Full Year February 8, 2022 2 Fourth Quarter Highlights Revenue strength ? Revenue growth 2.

November 22, 2021 EX-4.1

Base Indenture, dated as of November 22, 2021, among Omnicom Capital Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee (“2021 Base Indenture”), (Exhibit 4.1 to our Current Report on Form 8-K (File No. 1-10551) filed on November 22, 2021 (“November 22, 2021 8-K”) and incorporated herein by reference).

Omnicom Group Inc. 8-K Exhibit 4.1 OMNICOM CAPITAL HOLDINGS PLC, as Issuer OMNICOM GROUP INC., as Guarantor INDENTURE Dated as of November 22, 2021 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 SECTION 1.1 Definitions 1 SECTION 1.2 Other Definitions 6 SECTION 1.3 Incorporation by Reference of Trust Inde

November 22, 2021 8-A12B

INFORMATION REQUIRED IN REGISTRATION STATEMENT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Omnicom Group Inc. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 280

November 22, 2021 EX-1.1

Underwriting Agreement, dated November 17, 2021, among Omnicom Capital Holdings plc, as issuer, Omnicom Group Inc., as guarantor, BNP Paribas, Deutsche Bank AG, London Branch, and J.P. Morgan Securities plc, as representatives of the several underwriters, and the other underwriters named therein

Omnicom Group Inc. 8-K Exhibit 1.1 Omnicom Capital Holdings plc 2.250% Senior Notes due 2033 Underwriting Agreement November 17, 2021 To the Representatives named in Schedule I hereto of the several Underwriters named in Schedule II hereto Ladies and Gentlemen: Omnicom Capital Holdings plc, a public limited company organized under the laws of England and Wales (the ?Issuer?), proposes to sell to t

November 22, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 17, 2021 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York (State or other jurisdiction of incorporation) 1-10551 (Commission File Number) 13

November 22, 2021 EX-4.2

First Supplemental Indenture to the 2021 Base Indenture, dated as of November 22, 2021, among Omnicom Capital Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee, in connection with the issuance of £325 million aggregate principal amount of 2.250% Senior Notes due 2033 (Exhibit 4.2 to the November 22, 2021 8-K) and incorporated herein by reference).

Omnicom Group Inc. 8-K Exhibit 4.2 OMNICOM CAPITAL HOLDINGS PLC as Issuer OMNICOM GROUP INC. as Guarantor FIRST SUPPLEMENTAL INDENTURE Dated as of November 22, 2021 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities First Supplemental Indenture dated as of November 22, 2021 (the ?First Supplemental Indenture?) among Omnicom Capital Holdings plc, a public limited company organized unde

November 19, 2021 424B2

Joint Book-Running Managers BNP PARIBAS Deutsche Bank J.P. Morgan BofA Securities Barclays HSBC Co-Managers ING Société Générale Corporate & Investment Banking BBVA

CALCULATION OF REGISTRATION FEE Title of Class of Securities Offered Amount to be Registered(1) Proposed Maximum Offering Price Per Unit Proposed Maximum Aggregate Offering Price Amount of Registration Fee(2) 2.

November 17, 2021 424B2

SUBJECT TO COMPLETION, DATED NOVEMBER 17, 2021

SUBJECT TO COMPLETION, DATED NOVEMBER 17, 2021 Preliminary Prospectus Supplement (to prospectus dated November 12, 2021) Filed pursuant to Rule 424(b)(2) Registration No.

November 17, 2021 FWP

Omnicom Capital Holdings plc £325,000,000 2.250% Senior Notes due 2033 Pricing Term Sheet

FWP 1 omc-fwp111721.htm ISSUER FREE WRITING PROSPECTUS Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Registration Statement No. 333-261046 November 17, 2021 Omnicom Capital Holdings plc £325,000,000 2.250% Senior Notes due 2033 Pricing Term Sheet £325,000,000 2.250% Senior Notes due 2033: Issuer: Omnicom Capital Holdings plc Issuer LEI: 984500F16BDDD57A5502 Guarantor: Omnicom Group Inc

November 12, 2021 S-3ASR

As filed with the Securities and Exchange Commission on November 12, 2021

As filed with the Securities and Exchange Commission on November 12, 2021 Registration No.

November 12, 2021 EX-4.10

Form of Indenture among Omnicom Finance Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee (the “Omnicom Finance Holdings Indenture”)

Omnicom Group Inc. S-3ASR Exhibit 4.10 OMNICOM FINANCE HOLDINGS PLC, as Issuer OMNICOM GROUP INC., as Guarantor INDENTURE Dated as of DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 SECTION 1.1 Definitions 1 SECTION 1.2 Other Definitions 6 SECTION 1.3 Incorporation by Reference of Trust Indenture Act 6 SE

November 12, 2021 EX-25.3

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Capital Holdings Indenture

Omnicom Group Inc. S-3ASR Exhibit 25.3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact

November 12, 2021 EX-4.11

Form of Indenture among Omnicom Capital Holdings plc, as issuer, Omnicom Group Inc., as guarantor, and Deutsche Bank Trust Company Americas, as trustee (the “Omnicom Capital Holdings Indenture”)

Omnicom Group Inc. S-3ASR Exhibit 4.11 OMNICOM CAPITAL HOLDINGS PLC, as Issuer OMNICOM GROUP INC., as Guarantor INDENTURE Dated as of DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE 1 SECTION 1.1 Definitions 1 SECTION 1.2 Other Definitions 6 SECTION 1.3 Incorporation by Reference of Trust Indenture Act 6 SE

November 12, 2021 EX-25.1

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Group Inc. Indenture

Omnicom Group Inc. S-3ASR Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact

November 12, 2021 EX-25.2

Statement of Eligibility on Form T-1 of Deutsche Bank Trust Company Americas to act as trustee under the Omnicom Finance Holdings Indenture

EX-25.2 8 ex25-2.htm STATEMENT OF ELIGIBILITY ON FORM T-1 Omnicom Group Inc. S-3ASR Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST

November 1, 2021 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 29, 2021 OMNICOM GROUP INC.

November 1, 2021 EX-99.1

Omnicom Group Announces Two Top Executive Changes Daryl Simm Elevated to President and COO, Omnicom Group Florian Adamski Named CEO, Omnicom Media Group

Exhibit 99.1 Omnicom Group Announces Two Top Executive Changes Daryl Simm Elevated to President and COO, Omnicom Group Florian Adamski Named CEO, Omnicom Media Group New York, Nov. 1, 2021 ? Omnicom Group Inc. (NYSE: OMC) today announced two important senior management changes at the holding company and network level. Effective immediately, Daryl Simm moves into the role of President and Chief Ope

October 20, 2021 10-Q

___________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specifi

October 19, 2021 EX-99.1

OMNICOM GROUP REPORTS THIRD QUARTER 2021 RESULTS Revenue of $3,435.0 million increased 7.1%, with organic growth of 11.5% Operating profit of $541.6 million increased 8.0% Operating profit margin of 15.8% Net income of $355.6 million increased 13.5%

Exhibit 99.1 OMNICOM GROUP REPORTS THIRD QUARTER 2021 RESULTS Revenue of $3,435.0 million increased 7.1%, with organic growth of 11.5% Operating profit of $541.6 million increased 8.0% Operating profit margin of 15.8% Net income of $355.6 million increased 13.5% Diluted earnings per share of $1.65 increased 13.8% NEW YORK, October 19, 2021 - Omnicom Group Inc. (NYSE: OMC) today announced results f

October 19, 2021 EX-99.2

2021 Third Quarter October 19, 2021

Exhibit 99.2 2021 Third Quarter October 19, 2021 2 Highlights Robust revenue growth ? Revenue growth 7.1% reported, 11.5% organic ? Strength across agencies, geographies, and disciplines ? Expect continued strength for balance of year Cost controls continue ? EBIT up 8.0%, EBIT margin 15.8% ? Net income per diluted share up 13.8% to $1.65 Investing in our strategy ? Talent & creativity in all disc

October 19, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 19, 2021 OMNICOM GROUP INC.

July 23, 2021 EX-10.1

Employment Agreement dated as of July 21, 2021 by and between Omnicom Management Inc. and John D. Wren (Exhibit 10.1 to our Current Report on Form 8-K (File No. 1-10551) filed on July 23, 2021 and incorporated herein by reference).

Exhibit 10.1 EXECUTION VERSION EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (the ?Agreement?) dated as of July 21, 2021, by and between Omnicom Management Inc. (the ?Company?) and John D. Wren (the ?Executive?). W I T N E S S E T H: WHEREAS, the Board of Directors of Omnicom Group Inc. (?OGI?) have determined that it is in OGI?s best interests to enter into an Employment Agreement to incent the

July 23, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 21, 2021 OMNICOM GROUP INC.

July 20, 2021 EX-10.3

2021 Incentive Award Plan Option Agreement - Form of Grant Notice and Agreement (Exhibit 10.3 to June 30, 2021 10-Q and incorporated herein by reference).

EXHIBIT 10.3 OMNICOM GROUP INC. 2021 INCENTIVE AWARD PLAN OPTION AGREEMENT GRANT NOTICE Unless otherwise defined herein, capitalized terms used in this Grant Notice (the ?Grant Notice?) and the Option Agreement attached as Exhibit A to this Grant Notice (collectively, the ?Agreement?) have the meanings given in the Omnicom Group Inc. 2021 Incentive Award Plan (as amended, restated and/or otherwise

July 20, 2021 EX-99.1

Omnicom Group Reports Second Quarter and Year-to-Date 2021 Results

Exhibit 99.1 Omnicom Group Reports Second Quarter and Year-to-Date 2021 Results NEW YORK, July 20, 2021 - Omnicom Group Inc. (NYSE: OMC) today announced net income - Omnicom Group Inc. for the second quarter of 2021 of $348.2 million as compared to a net loss - Omnicom Group Inc. of $24.2 million in the second quarter of 2020. Diluted net income per share for the second quarter of 2021 was $1.60 p

July 20, 2021 EX-10.2

2021 Incentive Award Plan Restricted Stock Unit Agreement - Form of Grant Notice and Agreement (Exhibit 10.2 to our Quarterly Report on Form 10-Q (File No. 1-10551) for the quarter ended June 30, 2021 (“June 30, 2021 10-Q”) and incorporated herein by reference).

EXHIBIT 10.2 OMNICOM GROUP INC. 2021 INCENTIVE AWARD PLAN RESTRICTED STOCK UNIT AGREEMENT GRANT NOTICE Unless otherwise defined herein, capitalized terms used in this Grant Notice (the ?Grant Notice?) and the Restricted Stock Unit Agreement attached as Exhibit A to this Grant Notice (collectively, the ?Agreement?) have the meanings given in the Omnicom Group Inc. 2021 Incentive Award Plan (as amen

July 20, 2021 EX-99.2

July 20, 2021 Operating Expense Detail 3 Second Quarter Year to Date 2021 % of Rev 2020 (a)(b) % of Rev 2021 % of Rev 2020 (a)(b) % of Rev Revenue $ 3,571.6 $ 2,800.7 $ 6,998.6 $ 6,207.6 Operating expenses: Salary and service costs: Salary and relate

Second Quarter 2021 Results July 20, 2021 Investor Presentation Exhibit 99.2 Second Quarter 2021 Results July 20, 2021 Investor Presentation Exhibit 99.2 Second Quarter 2021 Results July 20, 2021 Investor Presentation Exhibit 99.2 July 20, 2021 Operating Expense Detail 3 Second Quarter Year to Date 2021 % of Rev 2020 (a)(b) % of Rev 2021 % of Rev 2020 (a)(b) % of Rev Revenue $ 3,571.6 $ 2,800.7 $

July 20, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 20, 2021 OMNICOM GROUP INC.

July 20, 2021 10-Q

___________________________________________________________________________________________________ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

June 25, 2021 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2020

11-K 1 a2020form11-k.htm 11-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2020 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: OMNICOM GROUP RETIREMENT SAVINGS PLAN B. Name of issuer of t

May 7, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 4, 2021 OMNICOM GROUP INC.

May 6, 2021 S-8

- FORM S-8

As filed with the United States Securities and Exchange Commission on May 6, 2021 Registration No.

May 3, 2021 EX-4.1

Third Supplemental Indenture to the 2020 Base Indenture, dated as of April 28, 2021, among Omnicom Group Inc., as issuer, and Deutsche Bank Trust Company Americas, as trustee, in connection with the issuance of $800 million 2.600% Senior Notes due 2031 (Exhibit 4.1 to our Current Report on Form 8-K (File No. 1-10551) filed on May 3, 2021 (the “May 3, 2021 8-K”) and incorporated herein by reference).

Exhibit 4.1 OMNICOM GROUP INC. as Issuer THIRD SUPPLEMENTAL INDENTURE Dated as of May 3, 2021 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities Third Supplemental Indenture dated as of May 3, 2021 (the ?Third Supplemental Indenture?) between Omnicom Group Inc., a New York corporation (the ?Issuer?) and Deutsche Bank Trust Company Americas, a New York banking corporation, as Trustee (

May 3, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2021 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 1-10551 13-1514814 (State or other jurisdiction of incorporation) (Commission File Nu

May 3, 2021 EX-1.1

Citigroup Global Markets Inc. and Wells Fargo Securities, LLC, as representatives of the several

Exhibit 1.1 ? Omnicom Group Inc. ? 2.600% Senior Notes due 2031 Underwriting Agreement April 28, 2021 To the Representatives named in Schedule?I hereto of the several Underwriters named in Schedule?II hereto Ladies and Gentlemen: Omnicom Group Inc., a New York corporation, (the ?Company?), proposes to sell to the several underwriters named in Schedule?II hereto (the ?Underwriters?), for whom you (

April 29, 2021 424B2

CALCULATION OF REGISTRATION FEE

424B2 1 e13365-424b2.htm PROSPECTUS SUPPLEMENT CALCULATION OF REGISTRATION FEE Title of Each Class of Securities Offered Maximum Aggregate Offering Price Amount of Registration Fee(1) 2.600% Senior Notes due 2031 $800,000,000 $87,280.00 (1) Calculated in accordance with Rule 457(r) under the Securities Act of 1933, as amended. Prospectus Supplement Filed pursuant to Rule 424(b)(2) (to prospectus d

April 28, 2021 424B5

SUBJECT TO COMPLETION, DATED APRIL 28, 2021

The information in this preliminary prospectus supplement is not complete and may be changed.

April 28, 2021 FWP

Omnicom Group Inc. $800,000,000 2.600% Senior Notes due 2031 Pricing Term Sheet

Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Registration Statement No.

April 20, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 20, 2021 OMNICOM GROUP INC.

April 20, 2021 EX-99.1

Omnicom Group Reports First Quarter 2021 Results

Exhibit 99.1 Omnicom Group Reports First Quarter 2021 Results NEW YORK, April 20, 2021 - Omnicom Group Inc. (NYSE: OMC) today announced net income - Omnicom Group Inc. for the first quarter of 2021 of $287.8 million as compared to $258.1 million in the first quarter of 2020. Diluted net income per share for the first quarter of 2021 was $1.33 per share compared to $1.19 in the first quarter of 202

April 20, 2021 EX-99.2

First Quarter 2021 Results April 20, 2021 Investor Presentation

Exhibit 99.2 First Quarter 2021 Results April 20, 2021 Investor Presentation 2021 vs. 2020 P&L Summary First Quarter 1 April 20, 2021 First Quarter 2021 2020 Revenue $ 3,426.9 $ 3,406.9 Operating Expenses (a) 2,961.5 2,986.7 Operating Profit 465.4 420.2 Net Interest Expense 47.5 45.8 Income Tax Expense 111.9 97.4 Tax Rate % 26.8 % 26.0 % Income (Loss) From Equity Method Investments ? (5.3) Net Inc

April 20, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified i

April 19, 2021 DEFA14A

- DEFINITIVE ADDITIONAL MATERIALS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

March 25, 2021 DEF 14A

Information specifically incorporated by reference in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 from its definitive proxy statement on Schedule 14A, filed with the SEC on March 25, 2021

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ? Filed by the Registrant ? Filed by a Party other than the Registrant CHECK THE APPROPRIATE BOX: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14

March 25, 2021 DEFA14A

- DEFINITIVE ADDITIONAL PROXY SOLICITING MATERIALS

DEFA14A 1 omc3858241-defa14a.htm DEFINITIVE ADDITIONAL PROXY SOLICITING MATERIALS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a Party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confi

March 25, 2021 DEF 14A

- DEFINITIVE PROXY STATEMENT

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February 18, 2021 EX-99.2

Fourth Quarter 2020 Results February 18, 2021 Investor Presentation

Exhibit 99.2 Fourth Quarter 2020 Results February 18, 2021 Investor Presentation February 18, 2021 2020 vs. 2019 P&L Summary Fourth Quarter 1 Fourth Quarter 2020 (a) 2019 Revenue $ 3,757.0 $ 4,141.2 Operating Expenses (b) 3,142.3 3,494.8 Operating Profit 614.7 646.4 Net Interest Expense 48.0 38.6 Income Tax Expense 141.5 158.8 Tax Rate % 25.0 % 26.1 % Income From Equity Method Investments 3.3 0.8

February 18, 2021 EX-21

Subsidiaries of the Registrant.

EX-21 2 a2020q4exhibit21.htm SUBSIDIARIES EXHIBIT 21 SUBSIDIARIES OF REGISTRANT Significant Subsidiaries Company Jurisdiction of Incorporation Percentage of Voting Securities Owned by Registrant Number of US subsidiaries Number of Non-US subsidiaries Omnicom APIMA Holdings Limited Hong Kong 100% — 74 Omnicom Capital Inc. Connecticut 100% 1 5 Omnicom Europe Limited United Kingdom 100% 5 480 Omnicom

February 18, 2021 EX-99.1

Omnicom Group Reports Fourth Quarter and Full Year 2020 Results

Exhibit 99.1 Omnicom Group Reports Fourth Quarter and Full Year 2020 Results NEW YORK, February 18, 2021 - Omnicom Group Inc. (NYSE: OMC) today announced net income - Omnicom Group Inc. for the fourth quarter of 2020 of $398.1 million compared to net income - Omnicom Group Inc. of $415.0 million in the fourth quarter of 2019. Diluted net income per share for the fourth quarter of 2020 was $1.84 pe

February 18, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2020 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organization

February 18, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 18, 2021 OMNICOM GROUP INC.

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Omnicom Group Inc. Title of Class of Securities: Common Stock CUSIP Number: 681919106 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ 

October 27, 2020 EX-10.2

Amendment No. 1 to the Credit Agreement, dated October 26, 2020, to the 364-Day Credit Agreement, dated as of April 3, 2020, by and among Omnicom Capital Inc., Omnicom Group Inc., the banks, financial institutions and other institutional lenders party thereto, Citibank, N.A., BofA Securities, Inc., Mizuho Bank, Ltd. and U.S. Bank National Association, as joint lead arrangers and joint book managers, Bank of America, N.A., Mizuho Bank, Ltd. and U.S. Bank National Association, as syndication agents, and Citibank, N.A., as administrative agent for the lenders.

AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of October 26, 2020 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”), dated as of October 26, 2020 among Omnicom Capital Inc., a Connecticut corporation (the “Borrower”), Omnicom Group Inc., a New York corporation (the “Guarantor”), the banks, financial institutions and other institutional lenders parties to the Credit Agreement referred t

October 27, 2020 EX-99.2

Third Quarter 2020 Results October 27, 2020 Investor Presentation

Exhibit 99.2 Third Quarter 2020 Results October 27, 2020 Investor Presentation 2020 vs. 2019 P&L Summary Third Quarter 1 October 27, 2020 Third Quarter 2020 (a) 2019 Revenue $ 3,206.5 $ 3,623.8 Operating Expenses (b) 2,705.1 3,150.5 Operating Profit 501.4 473.3 Net Interest Expense 48.5 49.3 Income Tax Expense 120.9 112.3 Tax Rate % 26.7 % 26.5 % Income From Equity Method Investments 2 .9 0 .5 Net

October 27, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - CURRENT REPORT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 27, 2020 OMNICOM GROUP INC.

October 27, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specifi

October 27, 2020 EX-99.1

Omnicom Group Reports Third Quarter and Year-to-Date 2020 Results

Exhibit 99.1 Omnicom Group Reports Third Quarter and Year-to-Date 2020 Results NEW YORK, October 27, 2020 - Omnicom Group Inc. (NYSE: OMC) today announced net income - Omnicom Group Inc. for the third quarter of 2020 of $313.3 million compared to net income - Omnicom Group Inc. of $290.2 million in the third quarter of 2019. Diluted net income per share for the third quarter of 2020 was $1.45 per

October 27, 2020 EX-10.1

Amendment No. 1 to the Credit Agreement, dated October 26, 2020, to the Second Amended and Restated Five Year Credit Agreement, dated as of February 14, 2020, by and among Omnicom Capital Inc., Omnicom Finance Limited, Omnicom Group Inc., any other subsidiary of Omnicom Group Inc. designated for borrowing privileges, the banks, financial institutions and other institutional lenders party thereto, Citibank, N.A., JPMorgan Chase Bank, N.A., and Wells Fargo Securities, LLC, as lead arrangers and book managers, JPMorgan Chase Bank, N.A. and Wells Fargo Bank, National Association, as syndication agents, Bank of America, N.A., BNP Paribas, Barclays Bank PLC, Deutsche Bank Securities Inc. and HSBC Bank USA, National Association, as documentation agents, and Citibank, N.A., as administrative agent for the lenders (Exhibit 10.1 to our Quarterly Report on Form 10-Q (File No. 1-10551) for the quarter ended September 30, 2020 and incorporated herein by reference

AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of October 26, 2020 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”), dated as of October 26, 2020 among Omnicom Capital Inc., a Connecticut corporation (“OCI”), and Omnicom Finance Limited, a private limited company organized under the laws of England and Wales (“OFL”; OCI and OFL are each a “Borrower” and collectively, the “Borrowers”),

July 28, 2020 EX-99.2

Second Quarter 2020 Results July 28, 2020 Investor Presentation

Exhibit 99.2 Second Quarter 2020 Results July 28, 2020 Investor Presentation 2020 vs. 2019 P&L Summary Second Quarter 1 July 28, 2020 Second Quarter 2020 (a) 2019 Revenue $ 2,800.7 $ 3,719.8 Operating Expenses (b) 2,738.2 3,146.1 Operating Profit 62.5 573.7 Net Interest Expense 47.2 50.2 Income Tax Expense 21.9 130.6 Tax Rate % 143.1% 24.9% Income (Loss) From Equity Method Investments (7.8) 1.2 Ne

July 28, 2020 EX-99.1

Omnicom Group Reports Second Quarter and Year-to-Date 2020 Results

Exhibit 99.1 Omnicom Group Reports Second Quarter and Year-to-Date 2020 Results NEW YORK, July 28, 2020 - Omnicom Group Inc. (NYSE: OMC) today announced a net loss - Omnicom Group Inc. for the second quarter of 2020 of $24.2 million compared to net income - Omnicom Group Inc. of $370.7 million in the second quarter of 2019. Diluted net loss per share for the second quarter of 2020 was $0.11 per sh

July 28, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 28, 2020 OMNICOM GROUP INC.

July 28, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in

June 11, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 9, 2020 OMNICOM GROUP INC.

April 29, 2020 DEF 14A

DEFINITIVE PROXY STATEMENT

Proxy Statement 2020 Annual Meeting of Shareholders June 9, 2020 at 10:00 a.m. Eastern Daylight Time ICON International One East Weaver Street Greenwich, CT 06831 Shareholders may also attend online at www.virtualshareholdermeeting.com/OMC20202 2020 Proxy Statement A Letter from Omnicom’s Lead Independent Director To My Fellow Shareholders: I would like to start by acknowledging the difficult time

April 29, 2020 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) ☑ Filed by the Registrant ☐ Filed by a Party other than the Registrant CHECK THE APPROPRIATE BOX: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Only (as permitted by Rule 14

April 28, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2020 OMNICOM GROUP INC.

April 28, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2020 Commission File Number: 1-10551 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York 13-1514814 (State or other jurisdiction of incorporation or organiz

April 28, 2020 EX-99.1

Omnicom Group Reports First Quarter 2020 Results

Exhibit 99.1 Omnicom Group Reports First Quarter 2020 Results NEW YORK, April 28, 2020 - Omnicom Group Inc. (NYSE: OMC) today announced that its diluted net income per share for the first quarter of 2020 increased two cents, or 1.7%, to $1.19 per share compared to $1.17 for the first quarter of 2019. Net income - Omnicom Group Inc. for the first quarter of 2020 decreased $5.1 million, or 1.9%, to

April 28, 2020 EX-10.3

Rochelle Tarlowe employment letter (Exhibit 10.3 to the March 31, 2020 10-Q and incorporated herein by reference).

Exhibit 10.3 Omnicom Group Inc. Leslie Chiocco Vice President, Human Resources & Retirement Benefits March 22, 2019 Rochelle Tarlowe 215 West 90th Street, Apt. 7E New York, New York 10024 Dear Rochelle, It gives me great pleasure to confirm our offer of employment to you with Omnicom Management Inc. (the "Company" or "OMI"), the corporate office for Omnicom Group Inc., in the Stamford office under

April 28, 2020 EX-99.2

First Quarter 2020 Results April 28, 2020 Investor Presentation

Exhibit 99.2 First Quarter 2020 Results April 28, 2020 Investor Presentation COVID - 19 Operational Update 1 April 28, 2020 • Our assessment is focused on three key areas ◦ Protecting our people ◦ Serving our clients ◦ Preserving the strength of our businesses • Planning model is centered around ◦ Health and well - being of our people ◦ Assessment of economic conditions as lock - downs are lifted

April 28, 2020 EX-10.1

Director Compensation and Director Compensation and Deferred Stock Program Stock Program (Exhibit 10.1 to our Quarterly Report on Form 10-Q (File No. 1-10551) for the quarter ended March 31, 2020 (“March 31, 2020 10-Q”) and incorporated herein by reference).

OMNICOM GROUP INC. DIRECTOR COMPENSATION AND DEFERRED STOCK PROGRAM (AS AMENDED, EFFECTIVE JANUARY 1, 2020) 1.Purpose. The purpose of the Omnicom Group Inc. Director Compensation and Deferred Stock Program (the “Program”) is to promote the success and enhance the value of Omnicom Group Inc. (the “Company”) by linking the personal interests of the members of the Board of Directors of the Company to

April 6, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 3, 2020 OMNICOM GROUP INC.

April 6, 2020 EX-10.1

364-Day Credit Agreement, dated as of April 3, 2020, by and among Omnicom Capital Inc., Omnicom Group Inc., the banks, financial institutions and other institutional lenders and initial issuing banks listed on the signature pages thereof, Citibank, N.A., BofA Securities, Inc., Mizuho Bank, Ltd. and U.S. Bank National Association, as joint lead arrangers and joint book managers, Bank of America, N.A., Mizuho Bank, Ltd. and U.S. Bank National Association, as syndication agents, and Citibank, N.A., as administrative agent for the lenders (Exhibit 10.1 to our Current Report on Form 8-K (File No. 1-10551) filed on April 6, 2020 and incorporated herein by reference).

EXHIBIT 10.1 U.S. $400,000,000 364-DAY CREDIT AGREEMENT Dated as of April 3, 2020, Among OMNICOM CAPITAL INC. as Borrower OMNICOM GROUP INC. as Guarantor THE INITIAL LENDERS NAMED HEREIN as Initial Lenders CITIBANK, N.A., BOFA SECURITIES, INC., MIZUHO BANK, LTD. and U.S. BANK NATIONAL ASSOCIATION as Joint Lead Arrangers and Joint Book Managers BANK OF AMERICA, N.A., MIZUHO BANK, LTD. and U.S. BANK

April 1, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 27, 2020 OMNICOM GROUP INC. (Exact name of registrant as specified in its charter) New York (State or other jurisdiction of incorporation) 1-10551 (Commission File Number) 13-15

April 1, 2020 EX-1.1

Underwriting Agreement, dated March 27, 2020, among Omnicom Group Inc., Citigroup Global Markets Inc., BofA Securities, Inc. and J.P. Morgan Securities LLC, as representatives of the several underwriters named therein

Exhibit 1.1 Omnicom Group Inc. 4.200% Senior Notes due 2030 Underwriting Agreement March 27, 2020 To the Representatives named in Schedule I hereto of the several Underwriters named in Schedule II hereto Ladies and Gentlemen: Omnicom Group Inc., a New York corporation, (the “Company”), proposes to sell to the several underwriters named in Schedule II hereto (the “Underwriters”), for whom you (the

April 1, 2020 EX-4.1

Second Supplemental Indenture to the 2020 Base Indenture, dated as of April 1, 2020, among Omnicom Group Inc., as issuer, and Deutsche Bank Trust Company Americas, as trustee, in connection with the issuance of $600 million 4.200% Senior Notes due 2030 (Exhibit 4.1 to our Current Report on Form 8-K (File No. 1-10551) filed on April 1, 2020 (“April 1, 2020 8-K”) and incorporated herein by reference).

Exhibit 4.1 OMNICOM GROUP INC. as Issuer SECOND SUPPLEMENTAL INDENTURE Dated as of April 1, 2020 DEUTSCHE BANK TRUST COMPANY AMERICAS as Trustee Debt Securities Second Supplemental Indenture dated as of April 1, 2020 (the “Second Supplemental Indenture”) between Omnicom Group Inc., a New York corporation (the “Issuer”) and Deutsche Bank Trust Company Americas, a New York banking corporation, as Tr

March 30, 2020 424B2

CALCULATION OF REGISTRATION FEE

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities Offered Maximum Aggregate Offering Price Amount of Registration Fee(1) 4.

March 27, 2020 424B5

SUBJECT TO COMPLETION, DATED MARCH 27, 2020

The information in this preliminary prospectus supplement is not complete and may be changed.

March 27, 2020 FWP

Omnicom Group Inc. $600,000,000 4.200% Senior Notes due 2030 Pricing Term Sheet

Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Registration Statement No.

March 25, 2020 EX-99.1

Omnicom Group Provides Update on Current Impact of COVID-19

Exhibit 99.1 Omnicom Group Provides Update on Current Impact of COVID-19 NEW YORK, March 25, 2020 - Omnicom Group Inc. (NYSE: OMC) today announced an update related to coronavirus disease 2019 (COVID-19). John D. Wren, Chairman and Chief Executive Officer of Omnicom, commented, “We have been closely monitoring the COVID-19 pandemic and its impact on our people, clients and operations. Our primary

March 25, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 25, 2020 OMNICOM GROUP INC.

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