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( Mark One ) 冈 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 Or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-32871 COMCAST Exact Name of Registrant ; State of Incorporation ; Address and Telephone Number of Principal Executive Offices COMCAST CORPORATION Pennsylvania One Comcast Center Philadelphia , PA 19103-2838 ( 215 ) 286-1700 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Class A Common Stock , $ 0.01 par value I.R.S. Employer Identification No. 27-0000798 0.250 % Notes due 2027 1.500 % Notes due 2029 0.750 % Notes due 2032 1.875 % Notes due 2036 1.250 % Notes due 2040 9.455 % Guaranteed Notes due 2022 5.50 % Notes due 2029 2.0 % Exchangeable Subordinated Debentures due 2029 Trading Symbol ( s ) CMCSA CMCS27 CMCS29 CMCS32 CMCS36 CMCS40 CMCSA / 22 CCGBP29 CCZ Name of each exchange on which registered NASDAQ Global Select Market NASDAQ Global Market NASDAQ Global Market NASDAQ Global Market NASDAQ Global Market NASDAQ Global Market 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 twelve 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 ( §232.405 of this chapter ) 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 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 ☑ Accelerated filer ☐ Non - accelerated filer □ Smaller reporting company ☐ 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 ☑ Indicate the number of shares outstanding of each of the issuer's classes of common stock , as of the latest practicable date : As of March 31 , 2021 , there were 4,584,571,926 shares of Comcast Corporation Class A common stock and 9,444,375 shares of Class B common stock outstanding .