Page 1

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 in its charter ) New York ( State or other jurisdiction of incorporation or organization ) 280 Park Avenue , New York , NY ( Address of principal executive offices ) 13-1514814 ( IRS Employer Identification No. ) 10017 ( Zip Code ) Registrant's telephone number , including area code : ( 212 ) 415-3600 Not Applicable ( Former name , former address and former fiscal year , if changed since last report ) Securities Registered Pursuant to Section 12 ( b ) of the Act : Trading Symbols Name of each exchange on which registered Title of each class Common Stock , $ 0.15 Par Value 0.800 % Senior Notes due 2027 1.400 % Senior Notes due 2031 OMC OMC / 27 OMC / 31 New York Stock Exchange New York Stock Exchange New York Stock Exchange Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large accelerated filer Smaller reporting company ✓ ☐ Accelerated filer ☐ Non - accelerated filer Emerging growth company ☐ ☐ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No ✓ As of April 15 , 2021 , there were 215,080,771 shares of Omnicom Group Inc. Common Stock outstanding .