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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31 , 2020 OR Commission File Number 001-32871 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM FORM 10 - K 1.500 % Notes due 2029 0.750 % Notes due 2032 Title of Each Class Class A Common Stock , $ 0.01 par value 0.250 % Notes due 2027 SECURITIES REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT : Trading symbol ( s ) 1.875 % Notes due 2036 1.250 % Notes due 2040 9.455 % Guaranteed Notes due 2022 COMCAST Registrant ; State of Incorporation ; Address and Telephone Number COMCAST CORPORATION Pennsylvania One Comcast Center Philadelphia , PA 19103-2838 ( 215 ) 286-1700 CMCSA CMCS27 CMCS29 CMCS32 CMCS36 CMCS40 CMCSA / 22 5.50 % Notes due 2029 2.0 % Exchangeable Subordinated Debentures due 2029 SECURITIES REGISTERED PURSUANT TO SECTION 12 ( g ) OF THE ACT : CCGBP29 CCZ to I.R.S. Employer Identification No. 27-0000798 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 NONE Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No 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 ( §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 definition 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 Smaller reporting company ☐ Emerging growth company Non - accelerated filer DOCUMENTS INCORPORATED BY REFERENCE Comcast Corporation - Part III - The registrant's definitive Proxy Statement for its annual meeting of shareholders . 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 has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes No 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 June 30 , 2020 , the aggregate market value of the Comcast Corporation common stock held by non - affiliates of the registrant was $ 176.648 billion . Indicate the number of shares outstanding of each of the registrant's classes of common stock , as of the latest practicable date : As of December 31 , 2020 , there were 4,571,211,797 shares of Comcast Corporation Class A common stock and 9,444,375 shares of Class B common stock outstanding .