Filed Pursuant to Rule 433

Registration Statement Number 333-266390

September 23, 2024

COMCAST CORPORATION

€900,000,000 3.250% Euro Notes due 2032 (the “2032 Euro Notes”)

€900,000,000 3.550% Euro Notes due 2036 (the “2036 Euro Notes”)

£750,000,000 5.250% Sterling Notes due 2040 (the “Sterling Notes”)

The 2032 Euro Notes and 2036 Euro Notes are herein referred to as the “Euro Notes.” The Euro Notes and Sterling Notes are herein referred to as the “Notes.”

Final Term Sheet

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It is expected that delivery of the Notes will be made against payment therefor on or about September 26, 2024, which is the third business day following the date hereof (such settlement cycle being referred to as “T+3”). Under Rule 15c6-1 under the Securities Exchange Act of 1934, as amended, trades in the secondary market generally are required to settle in one business day unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade the notes prior to the business day preceding the settlement date will be required, by virtue of the fact that the notes initially will settle in T+3, to specify an alternative settlement cycle at the time of any such trade to prevent failed settlement and should consult their own advisors.

The Notes will be represented by beneficial interests in fully registered permanent global notes without interest coupons attached, which will be registered in the name of, and shall be deposited on or about September 26, 2024 with a common depositary for, and in respect of interests held through, Euroclear Bank, S.A./N.V., as operator of the Euroclear System (“Euroclear”), and Clearstream Banking, société anonyme (“Clearstream”). Any Notes represented by global notes held by a nominee of Euroclear or Clearstream will be subject to the then applicable procedures of Euroclear and Clearstream, as applicable. Euroclear and Clearstream’s current practice is to make payments in respect of global notes to participants of record that hold an interest in the relevant global notes at the close of business on the date that is the clearing system business day (for these purposes, Monday to Friday inclusive except December 25th and January 1st) immediately preceding each applicable interest payment date.

This term sheet is not a prospectus for the purposes of Regulation (EU) 2017/1129, including the same as it forms part of domestic law in the United Kingdom by virtue of the European Union (Withdrawal) Act 2018, as amended by the European Union (Withdrawal Agreement) Act 2020.

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MiFID II and UK MiFIR – professionals/ECPs-only / No PRIIPs or UK PRIIPs KID – Manufacturer target market (MiFID II and UK MiFIR product governance) is eligible counterparties and professional clients only (all distribution channels). No PRIIPs or UK PRIIPs key information document (KID) has been prepared as the notes are not available to retail investors in the EEA or UK.

The communication of this term sheet and any other document or materials relating to the issue of the notes is not being made, and such documents or materials have not been approved, by an authorized person for the purposes of Section 21 of the United Kingdom’s Financial Services and Markets Act 2000, as amended. Accordingly, such documents and/or materials are not being distributed to, and must not be passed on to, the general public in the United Kingdom. This document and such other documents and/or materials are for distribution only to persons who (i) have professional experience in matters relating to investments and who fall within the definition of investment professionals (as defined in Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Financial Promotion Order”)), (ii) fall within Article 49(2)(a) to (d) of the Financial Promotion Order, (iii) are outside the United Kingdom, or (iv) are other persons to whom it may otherwise lawfully be made under the Financial Promotion Order (all such persons together being referred to as “relevant persons”). This document is directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this term sheet and any other document or materials relates will be engaged in only with relevant persons. Any person in the United Kingdom that is not a relevant person should not act or rely on this term sheet or any of its contents.

Relevant stabilization regulations including FCA/ICMA will apply.

The issuer has filed a registration statement (including a prospectus and accompanying prospectus supplement) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement, the accompanying prospectus supplement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus and the prospectus supplement if you request it by calling Barclays Bank PLC at 1-888-603-5847 or BNP Paribas at (800) 854-5674.

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