FORM 10-K 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 SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file suchreports) 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 submittedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period thatthe 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 smallerreporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large acceleratedfiler☐Accelerated filer☐Non-accelerated filer☐Smaller reportingcompany☐Emerging growthcompany If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying 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 theeffectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) bythe registered public accounting firm that prepared or issued its audit report. Yes☐No☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of theregistrant included in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1 (b).☐ 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, 2024, the aggregate market value of the Comcast Corporation common stock held by non-affiliates of the registrantwas $150.621 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 January 15, 2025, there were 3,771,578,226 shares of Comcast Corporation Class A common stock and 9,444,375 shares ofClass B common stock outstanding. DOCUMENTS INCORPORATED BY REFERENCE Comcast Corporation – Part III – The registrant’s definitive Proxy Statement for its annual meeting of shareholders. Table of Contents Comcast Corporation2024 Annual Report on Form 10-K Table of Contents PART I Item 1Business1Item 1ARisk Factors18Item 1BUnresolved Staff Comments25Item 1CCybersecurity26Item 2Properties27Item 3Legal Proceedings27Item 4Mine Safety Disclosures27 PART IIItem 5Market for Registrant’s Common Equity, Related Stockholder Matters and IssuerPurchases of Equity Securities28Item 6[Reserved]29Item 7Management’s Discussion and Analysis of Financial Condition and Results ofOperations30Item 7AQuantitative and Qualitative Disclosures About Market Risk54 Item 8Comcast Corporation Financial Statements and Supplementary Data56Item 9Changes in and Disagreements with Accountants on Accounting and FinancialDisclosure92Item 9AControls and Procedures92Item 9BOther Information92Item 9CDisclosure Regarding Foreign Jurisdictions that Prevent Inspections92 PART III Item 10Directors, Executive Officers and Corporate Governance93Item 11Executive Compensation93Item 12Security Ownership of Certain Beneficial Owners and Management and RelatedStockholder Matters94Item 13Certain Relationships and Related Transactions, and Director Independence94Item 14Principal Accountant Fees and Services94 PART IV Item 15Exhibits and Financial Statement Schedules95Item 16Form 10-K Summary98 Signatures Explanatory Note This Annual Report on Form 10-K is for the year ended December 31, 2024. This Annual Report onForm 10-Kmodifies and supersedes documents filed before it.The U.S Securities and ExchangeCommission (“SEC”) allows us to “incorporate by reference” information that we file with it, which meansthatwe can disclose important information to you by referring you directly to those documents.Information incorporated by reference is considered to be part of this Annual Report o