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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549



                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) of the
                        SECURITIES EXCHANGE ACT OF 1934



          Date of Report (Date of earliest event reported): May 4, 1999

                               COMCAST CORPORATION
             -------------------------------------------------------
             (Exact name of registrant as specified in its charter)

         PENNSYLVANIA                000-06983                 23-1709202
- ----------------------------        ------------            -------------------
(State or other jurisdiction        (Commission               (IRS employer
   of incorporation)                file number)            identification no.)

             1500 Market Street, Philadelphia, PA          19102-2148
           ----------------------------------------------------------
             (Address of principal executive offices)     (Zip Code)

       Registrant's telephone number, including area code: (215) 665-1700
                                                           --------------

ITEM 5. OTHER EVENTS On May 4, 1999, Comcast Corporation, a Pennsylvania corporation ("Comcast"), entered into an agreement (the "Agreement") with AT&T Corp., a New York corporation ("AT&T"). A joint press release announcing the Agreement was issued by Comcast and AT&T on May 4, 1999. The information contained in the press release is incorporated herein by reference. The press release is attached hereto as Exhibit 99.1. On May 6, 1999, MediaOne Group, Inc, a Delaware corporation ("MediaOne"), terminated the Agreement and Plan of Merger (the "Merger Agreement") dated as of March 22, 1999 between Comcast and MediaOne. A press release announcing the termination was issued by Comcast on May 6, 1999. The information contained in the press release is incorporated herein by reference. The press release is attached as Exhibit 99.2. ITEM 7(c). EXHIBITS 99.1 Joint Press Release dated May 4, 1999. 99.2 Press Release dated May 6, 1999.

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. COMCAST CORPORATION Dated: May 6, 1999 By: /s/ Joseph J. Euteneuer --------------------------------------- Vice President and Corporate Controller 2

                                                             COMCAST CORPORATION

NEWS RELEASE

- -------------------------------------------------------------------------------
Adele Ambrose, AT&T                          John R. Alchin, Comcast
Vice President Public Relations              Senior Vice President and Treasurer
908-221-6900 (office)                        (215) 981-7503
888-602-5420 (pager)

                                             William E. Dordelman, Comcast
Eileen M. Connolly, AT&T                     Vice President, Finance
Director Financial Communications            (215) 981-7550
908-221-6731 (office)
888-602-5417 (pager)                         Marlene S. Dooner, Comcast
                                             Senior Director, Investor Relations
                                             (215) 981-7392


                  AT&T and Comcast Agree To Swap Cable Systems
                    Comcast to Add 2 Million New Subscribers
            Two Companies To Collaborate In Offering Cable Telephony

FOR RELEASE:  TUESDAY, MAY 4, 1999

NEW YORK -- AT&T and Comcast  Corporation  today announced that they had reached
an agreement under which Comcast will be able to increase its cable  subscribers
by about two  million  households  and the two  companies  will  collaborate  in
bringing competitive local telephone service to Comcast's customers.

Under the  agreement,  AT&T and Comcast will  exchange  various  cable  systems,
resulting in a net addition to Comcast of approximately 750,000 subscribers. The
swaps are  designed  to improve  each  company's  geographic  coverage by better
clustering its systems. Because Comcast will receive more subscribers than it is
contributing  in the  swaps,  it will pay AT&T  consideration  having a value of
approximately  $4,500  per added  subscriber  for a total  value of $3.0 to $3.5
billion.  The  majority  of the  exchanges  are  subject  to  completion  of the
AT&T/MediaOne merger, as well as to customary closing conditions.

Comcast will also  receive an option from AT&T to purchase,  over the next three
years,  additional  cable  systems  with a total of  approximately  1.25 million
subscribers. The exercise of this option is also contingent on the completion of
the AT&T/MediaOne  merger. The price for these additional systems is expected to
be  consideration  having a value of  approximately  $5.7  billion  (subject  to
reduction for any long-term debt and other liabilities of the acquired systems).

                                    --more--

- 2- Comcast has also agreed to offer AT&T-branded telephony in all of its markets on an expedited basis, as soon as AT&T has concluded separate telephony agreements with at least two other non-AT&T affiliated multiple system operators. Comcast will be entitled to the most favorable terms AT&T has reached with any of those cable operators. "These agreements are great news for millions of American families who will now have a choice in local phone service," said AT&T Chairman and CEO C. Michael Armstrong. "This transaction makes strategic sense for both companies. Geographic clustering enables more effective telephony competition. And AT&T is proud to join with Comcast in bringing AT&T-branded communications services to its customers." "This is a terrific outcome for Comcast shareholders. Through this transaction, Comcast firmly establishes its leadership role in the industry by becoming the third-largest cable company, with more than 8 million subscribers. While growing significantly in absolute terms, we have strengthened our local and regional presence through additional clustering," said Brian L. Roberts, President of Comcast Corporation. "In addition to these valuable cable assets, this agreement greatly accelerates our entrance into telephony and will enable us to more quickly create and provide important new products to our customers. This is a different outcome than our MediaOne proposal, but it is an elegant win-win result." The purchase price for the net additional subscribers resulting from the swap transactions can be paid in a number of ways, including in shares of AT&T common stock currently owned or subsequently acquired by Comcast. The value of any AT&T common stock exchanged in these transactions will be set at their average trading price during the 20-trading day period beginning June 6. When Comcast exercises its option to acquire the additional systems serving AT&T cable subscribers, it will compensate AT&T in shares of Comcast Class A Special Common Stock (CMCSK), which will be valued on the same basis, or with other forms of consideration of equivalent value. Except for any portion of the swap transactions paid in cash or in certain other equity securities, each of these transactions is expected to be concluded on a tax-free basis. AT&T was advised by Goldman, Sachs & Co., CS First Boston and received legal counsel from Wachtell, Lipton, Rosen & Katz. Comcast was advised by Salomon Smith Barney, Lazard Freres & Co. LLC., and Davis Polk & Wardwell. AT&T (http://www.ADT.com) is the world's premier provider of voice and data communications, with more than 80 million customers, including businesses, government and consumers. AT&T runs the world's largest, most powerful long-distance network and the largest wireless network in North America. The company is a leading supplier of data and Internet services for businesses and the nation's largest direct Internet service provider to consumers. AT&T also provides local telephone service to a growing number of businesses. -- more --

- 3 - Comcast Corporation (http://www.comcast.com) is principally engaged in the development, management and operation of broadband cable networks and in the provision of content through principal ownership of QVC, Comcast-Spectacor and Comcast SportsNet, a controlling interest in E! Entertainment Television and through programming investments. Comcast's Class A Special Common Stock and Class A Common Stock are traded on The Nasdaq Stock Market under the symbols CMCSK and CMCSA, respectively. # # #

                                                             COMCAST CORPORATION

NEWS RELEASE

- -------------------------------------------------------------------------------

Contact:
John R. Alchin, Senior Vice President and Treasurer      (215) 981-7503
William E. Dordelman, Vice President, Finance            (215) 981-7550
Marlene S. Dooner, Senior Director, Investor Relations   (215) 981-7392

FOR IMMEDIATE RELEASE

                  COMCAST-MEDIAONE MERGER AGREEMENT TERMINATED
                 Comcast receives $1.5 Billion Termination Fee

Philadelphia,  PA - May 6,  1999....Comcast  Corporation  announced  today  that
MediaOne has terminated the Merger  Agreement dated as of March 22, 1999 between
Comcast and  MediaOne.  MediaOne has paid  Comcast the $1.5 billion  termination
fee, as required under the Merger Agreement.



Comcast  Corporation  (http://www.comcast.com)  is  principally  engaged  in the
development,  management  and operation of broadband  cable  networks and in the
provision of content through principal ownership of QVC,  Comcast-Spectacor  and
Comcast SportsNet,  a controlling  interest in E!  Entertainment  Television and
through other programming investments.

Comcast's  Class A Special  Common  Stock and Class A Common Stock are traded on
The Nasdaq Stock Market under the symbols CMCSK and CMCSA, respectively.



                                      ####