SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 11-K

                                  ANNUAL REPORT

                        Pursuant to Section 15(d) of the
                         Securities Exchange Act of 1934

                            [GRAPHIC OMITTED - LOGO]

                               COMCAST CORPORATION


(Mark One):

 X        ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT
---       OF 1934.
          For the fiscal year ended  December 31, 2000.

                                       OR

---       TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE
          ACT OF 1934.
          For the transition period from _________ to ________

Commission file number 0-6983
                       ------

          A. Full title of the plan and the  address of the plan,  if  different
from that of the issuer named below:

          THE COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN

          B. Name of issuer of the securities  held pursuant to the plan and the
address of its principal executive office:

          Comcast Corporation
          1500 Market Street
          Philadelphia, PA 19102-2148





                         COMCAST CORPORATION RETIREMENT-
                         INVESTMENT PLAN

                         Financial Statements as of
                         December 31, 2000 and 1999 and for each of the
                         Three Years in the Period Ended December 31, 2000;
                         Supplemental Schedule as of December 31, 2000;
                         and Independent Auditors' Report






COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

TABLE OF CONTENTS
--------------------------------------------------------------------------------



                                                                            Page
                                                                            ----

INDEPENDENT AUDITORS' REPORT                                                   1

FINANCIAL STATEMENTS:

     Statement of Net Assets Available for Benefits as of December 31,
         2000 and 1999                                                         2

     Statement of Changes in Net Assets Available for Benefits for the
         Years Ended December 31, 2000, 1999 and 1998                          3

     Notes to Financial Statements                                          4-11

SUPPLEMENTAL SCHEDULE:

     Schedule H - Line 4i - Schedule of Assets Held for Investment
         Purposes as of December 31, 2000                                     12

INDEPENDENT AUDITORS' CONSENT                                                 13

SIGNATURE                                                                     14








INDEPENDENT AUDITORS' REPORT

Plan Administrator
Comcast Corporation Retirement-Investment Plan
Philadelphia, Pennsylvania

We have audited the accompanying statement of net assets available for benefits
of the Comcast Corporation Retirement-Investment Plan (the "Plan") as of
December 31, 2000 and 1999, and the related statement of changes in net assets
available for benefits for each of the three years in the period ended December
31, 2000. These financial statements are the responsibility of the Plan's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material
respects, the net assets available for benefits of the Comcast Corporation
Retirement-Investment Plan as of December 31, 2000 and 1999, and the related
changes in net assets available for benefits for each of the three years in the
period ended December 31, 2000 in conformity with accounting principles
generally accepted in the United States of America.

Our audits were conducted for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of Assets Held
for Investment Purposes (Schedule H - Line 4i) is presented for the purpose of
additional analysis and is not a required part of the basic financial
statements, but is supplementary information required by the Department of
Labor's Rules and Regulations for Reporting and Disclosure under the Employee
Retirement Income Security Act of 1974. The supplemental schedule is the
responsibility of the Plan's management. Such supplemental schedule has been
subjected to the auditing procedures applied in our audit of the basic 2000
financial statements and, in our opinion, is fairly stated in all material
respects when considered in relation to the basic financial statements taken as
a whole.




/s/ DELOITTE & TOUCHE LLP
Philadelphia, Pennsylvania
June 22, 2001



                                       -1-

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2000 AND 1999
--------------------------------------------------------------------------------





                                                              December 31,
                                                       2000                  1999
                                                  --------------        ---------------

                                                                     
ASSETS:
   Cash                                             $    777,957           $    297,530
   Investments, at fair or contract value            336,926,203            351,245,592
   Loans receivable from participants                  9,620,740              8,910,690
                                                   -------------          -------------

NET ASSETS AVAILABLE FOR BENEFITS                   $347,324,900           $360,453,812
                                                   =============          =============





See notes to financial statements.




                                       -2-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998
--------------------------------------------------------------------------------





                                                                         Years Ended December 31,
                                                                  2000             1999              1998
                                                             --------------    --------------   --------------
                                                                                         
(DEDUCTIONS) ADDITIONS TO NET ASSETS
  ATTRIBUTED TO:
   Investment income:
     Net realized and unrealized (depreciation)
       appreciation in fair value of investments              $ (52,351,113)     $ 84,771,033     $ 43,823,423
     Interest and dividends                                      14,403,290         8,232,242        6,893,230
                                                             --------------    --------------   --------------
                                                                (37,947,823)       93,003,275       50,716,653
                                                             --------------    --------------   --------------
   Contributions:
     Employee                                                    26,802,014        18,519,160       15,763,521
     Employer                                                    10,145,463         7,701,672        8,083,327
     Rollovers from merged plans (Note 2)                        17,298,499        54,633,073
                                                             --------------    --------------   --------------
                                                                 54,245,976        80,853,905       23,846,848
                                                             --------------    --------------   --------------

                                                                 16,298,153       173,857,180       74,563,501
                                                             --------------    --------------   --------------

DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:
   Benefits paid to participants or beneficiaries                29,427,065        24,659,096       13,575,986
                                                             --------------    --------------   --------------
                                                                 29,427,065        24,659,096       13,575,986
                                                             --------------    --------------   --------------

Net (decrease) increase                                         (13,128,912)      149,198,084       60,987,515

NET ASSETS AVAILABLE FOR BENEFITS:
   Beginning of year                                            360,453,812       211,255,728      150,268,213
                                                             --------------    --------------   --------------
   End of year                                                 $347,324,900      $360,453,812     $211,255,728
                                                             ==============    ==============   ==============


See notes to financial statements.

                                       -3-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998
--------------------------------------------------------------------------------


1.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

      General
      -------

      The financial statements of the Comcast Corporation  Retirement-Investment
      Plan (the "Plan") are  presented  using the accrual  basis of  accounting.
      Investments in mutual funds and the Comcast Stock Fund are carried at fair
      value.  Fair value is  determined  by the last sale or closing price as of
      the last trading day of the Plan year for investments in securities traded
      on a  securities  exchange  or  the  Nasdaq  National  Market.  Investment
      contracts  which are  included in the Comcast  Stable Value Fund are fully
      benefit-responsive  and are  carried at  contract  value.  Contract  value
      represents  contributions  made,  plus  interest at the contract  rate and
      transfers,  less  distributions.  Loans  receivable from  participants are
      valued at cost which approximates fair value. Net unrealized  appreciation
      or depreciation in the financial statements reflects changes in fair value
      of  investments  held at year end,  while net  realized  gains and  losses
      associated  with the  disposition  of  investments  are recorded as of the
      trade date and  calculated  based on fair value as of such date. All costs
      associated  with  administering  the Plan are paid or  incurred by Comcast
      Corporation ("Comcast," the "Company" or the "Plan Administrator").

      The  preparation  of financial  statements in conformity  with  accounting
      principles  generally  accepted in the United  States of America  requires
      management  to make  estimates  and  assumptions  that  affect the amounts
      reported  in the  financial  statements  and  accompanying  notes.  Actual
      results could differ from those estimates.

2.    PLAN DESCRIPTION

      General
      -------

      The following  description of the Plan provides only general  information.
      Plan  participants  should  refer  to the  Plan  document  and  applicable
      amendments  for a more  complete  description  of the  Plan's  provisions.
      Copies of these documents are available from the Plan Administrator.

      The Plan is a defined  contribution  plan qualified under Internal Revenue
      Code (the "Code")  Sections 401(k),  401(a) and 401(m).  The original Plan
      has been amended and  restated to reflect  mergers of other plans with and
      into the Plan and to make certain other  technical,  compliance and design
      changes.  The Plan is subject to the provisions of the Employee Retirement
      Income Security Act of 1974 ("ERISA").

      During 1999, the Plan was amended to allow an employee to become  eligible
      for  participation  in the Plan upon completion of 91 days of service,  as
      defined  in the  Plan,  and to  participate  in  allocations  of  employer
      matching  contributions  under the Plan  after  completion  of one year of
      service.  Prior  to July 1,  1999,  an  employee  was  eligible  for  both
      participation and employer matching  contributions  upon completion of one
      year of service.

      Each eligible employee may direct the Company to make contributions to the
      Plan of any whole  percentage  from 1% through 17% of their  compensation,
      subject to certain  limits  imposed by the Code. For the three years ended
      December  31,  2000,  the  Company  matched  100%  of  the   participant's
      contribution up to 1% of the  participant's  compensation for such payroll
      period,  and 50% of the participant's  contribution in excess of 1% of the
      participant's  compensation for such payroll period, up to a maximum total
      matching contribution of 3.5% of the participant's compensation.

      Effective  January 1, 2001,  the Plan was amended to increase the employer
      matching  contribution  rate  so  that  the  Company  matches  100% of the
      participant's  contribution up to 3% of the participant's compensation for
      such payroll period,  and 50% of the participant's  contribution in excess
      of 3% of the  participant's  compensation for such payroll period, up to a
      maximum  total  matching   contribution  of  4.5%  of  the   participant's
      compensation.


                                       -4-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------


      Each  participant has at all times a 100%  nonforfeitable  interest in the
      participant's    contributions   and   earnings    attributable   thereto.
      Contributions  by the Company and earnings  thereon during the three years
      ended December 31, 2000 vested according to the following schedule:

              Years of Service                                 Vested Percentage
              ----------------                                 -----------------

              1 year but less than 2 years                            20%
              2 years but less than 3 years                           40
              3 years but less than 4 years                           60
              4 years but less than 5 years                           80
              5 years or more                                        100

      Effective  January 1, 2001,  the Plan was amended to provide  that Company
      matching  contributions  allocated with respect to  participation  in plan
      years  beginning  after  December 31, 2000 shall be fully and  immediately
      vested.  The  applicable  vesting  schedule  under  the Plan  for  Company
      matching  contributions  allocated with respect to  participation  in plan
      years  ending  before  January  1,  2001  was not  affected  by this  Plan
      amendment.

      For employees hired on or before January 15, 1999, the Company contributed
      cash to purchase 10 shares of the Company's  Class A Special  Common Stock
      for the account of each newly eligible  participant.  These  contributions
      were  recorded at the market value of the shares at the date  contributed.
      Effective  for  employees  hired  after  January  15,  1999,  the  Company
      discontinued  such   contributions  to  the  accounts  of  newly  eligible
      participants.

      Each  participant  has the right, in accordance with the provisions of the
      Plan, to direct the investment by the trustee of the Plan (the  "Trustee")
      of all amounts allocated to the separate accounts of the participant under
      the Plan among any one or more of the  investment  fund  options (see Note
      3). The Trustee pays benefits and expenses  upon the written  direction of
      the Plan Administrator.

      Amounts  contributed by the Company which are forfeited by participants as
      a result of the  participants'  separation  from service prior to becoming
      100% vested may be used to reduce the  Company's  required  contributions.
      Pending application of the forfeitures, the Company may direct the Trustee
      to hold the forfeitures in cash or under investment in a suspense account.
      If the Plan should  terminate  with any  forfeitures  not applied  against
      Company contributions, they will be allocated to then current participants
      in the proportion that each participant's  compensation for that Plan year
      bears to the compensation for all such participants for the Plan year.

      Any  participant  who has a separation  from service for any reason except
      death,  disability  or  attainment  of age 65 shall be entitled to receive
      his/her vested account  balance.  Upon death,  disability or attainment of
      age 65, a  participant's  account  becomes  fully  vested  in all  Company
      contributions regardless of the participant's years of service. Generally,
      distribution  will start no later than 60 days after the close of the Plan
      year in which the participant's separation from service occurs, subject to
      certain  deferral  rights under the Plan.  The  distribution  alternatives
      permitted are a lump sum payment,  an annuity,  installments over a period
      of time,  any  combination  of the  foregoing  or a rollover  into another
      qualified plan.

      Although  it has not  expressed  any intent to do so, the  Company has the
      right under the Plan to discontinue its  contributions  at any time and to
      terminate  the Plan subject to the  provisions  of ERISA.  In the event of
      Plan  termination,  each  participant's  account balance will become fully
      vested.

      Rollover of Assets from Merged Plans
      ------------------------------------

      Effective April 1, 1999,  pursuant to the Company's  acquisition of assets
      associated  with the  operation of certain  cable  systems of Marcus Cable
      Operating  Company,  L.P. and Marcus Cable of Delaware and Maryland,  L.P.
      ("Marcus"),  the  Compensation  Committee of the Board of Directors of the
      Company resolved to merge the Marcus

                                       -5-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------


      Cable  Operating  Company,  L.P.  401(k) Plan (the "Marcus Plan") with and
      into the Plan. Effective on the merger date, the assets and liabilities of
      the Marcus Plan became assets and liabilities of the Plan. The transfer is
      included in the accompanying  statement of changes in net assets available
      for benefits as "Rollovers from merged plans" and approximated $213,000.

      Effective  October 1, 1999,  pursuant to the  Company's  acquisition  of a
      controlling interest in Jones Intercable, Inc. ("Jones") on April 7, 1999,
      the  Compensation  Committee  of the  Board of  Directors  of the  Company
      resolved   to   merge   the   Jones   Intercable,   Inc.   Et  Al   Profit
      Sharing/Retirement  Plan and the  Jones  Intercable,  Inc.  Et Al  Defined
      Contribution  Transfer  Plan (the "Jones  Plans")  with and into the Plan.
      Effective  on the merger  date,  the assets and  liabilities  of the Jones
      Plans became assets and  liabilities of the Plan. The transfer is included
      in the  accompanying  statement  of changes in net  assets  available  for
      benefits as "Rollovers from merged plans" and approximated $53,041,000.

      Effective  November 1, 1999,  pursuant  to the  Company's  acquisition  of
      Greater  Philadelphia  Cablevision,  Inc.  ("Greater  Philadelphia")  from
      Greater Media, Inc., the Compensation  Committee of the Board of Directors
      of the Company resolved to merge the Greater Media,  Inc. 401(k) Plan (the
      "Greater  Media  Plan")  with and into the Plan.  Effective  on the merger
      date,  the assets and  liabilities of the Greater Media Plan became assets
      and liabilities of the Plan. The transfer is included in the  accompanying
      statement of changes in net assets  available  for benefits as  "Rollovers
      from merged plans" and approximated $1,379,000.

      Effective May 1, 2000, pursuant to the Company's  acquisition of assets of
      Garden State Cablevision, L.P., the Compensation Committee of the Board of
      Directors of the Company  resolved to merge the Garden  State  Cablevision
      Retirement-Investment  Plan  (the  "GSCTV  Plan")  with and into the Plan.
      Effective on the merger date, the assets and liabilities of the GSCTV Plan
      became assets and liabilities of the Plan. The transfer is included in the
      accompanying  statement of changes in net assets available for benefits as
      "Rollovers from merged plans" and approximated $11,571,000.

      Effective August 1, 2000, pursuant to the Company's  acquisition of assets
      of Prime  Communications--Potomac  LLC, the Compensation  Committee of the
      Board  of   Directors   of  the  Company   resolved  to  merge  the  Prime
      Communications--Potomac LLC 401(k) Retirement & Savings Plan and the Prime
      Cable 401(k)  Savings and Security Plan (the "Prime  Plans") with and into
      the Plan.  Effective on the merger date, the assets and liabilities of the
      Prime Plans became  assets and  liabilities  of the Plan.  The transfer is
      included in the accompanying  statement of changes in net assets available
      for benefits as "Rollovers from merged plans" and approximated $5,727,000.

      Removal and Appointment of Trustee
      ----------------------------------

      Effective  April 1, 1999,  State Street Bank and Trust Company was removed
      as Trustee of the trust  established  under the Plan and Putnam  Fiduciary
      Trust Company, a Massachusetts trust company, was appointed Trustee of the
      trust established  under the Plan.  Concurrent with the change in Trustee,
      several  mutual funds  previously  provided as investment  funds under the
      Plan were eliminated and several new mutual funds with similar  investment
      strategies were added.

3.    INVESTMENT OPTIONS

      Upon   enrollment  in  the  Plan,  a  participant   may  direct   employee
      contributions   and  employer   contributions  (if  applicable)  in  whole
      percentage increments among one or more of the funds listed below. A brief
      summary  of each fund,  as  described  in each  fund's  prospectus  (where
      applicable), is as follows:


                                       -6-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------


      a.  Dodge  and  Cox  Balanced  Fund  -  The  Fund  seeks  regular  income,
          conservation of principal and an opportunity  for long-term  growth of
          principal and income.  The Fund invests in a diversified  portfolio of
          common  stocks,  preferred  stocks  and  bonds.  In  selecting  equity
          investments,  the  Fund  invests  in  companies  that,  in the  Fund's
          opinion,  appear to be temporarily undervalued by the stock market and
          have a favorable outlook for long-term growth. The Fund focuses on the
          underlying financial condition and prospects of individual  companies,
          including future earnings, cash flow and dividends. Companies are also
          selected  with an emphasis on financial  strength  and sound  economic
          condition. The returns on these investments vary as the stock and bond
          markets  fluctuate  and there is no  guarantee of principal or rate of
          return.

      b.  Putnam Investors Fund - The Fund seeks long-term growth of capital and
          any increased  income that results from this growth.  The Fund invests
          mainly in common  stocks of United States  companies,  with a focus on
          growth  stocks.  Growth  stocks are issued by companies  that the Fund
          believes are  fast-growing  and whose  earnings the Fund  believes are
          likely  to  increase  over  time.  Growth in  earnings  may lead to an
          increase in the price of the stock.  The Fund invests  mainly in large
          companies.  The  return  of  the  Fund  varies  as the  stock  markets
          fluctuate and there is no guarantee of principal or rate of return.

      c.  Putnam  New  Opportunities  Fund - The Fund  seeks  long-term  capital
          appreciation.  The Fund  invests  mainly  in  common  stocks of United
          States  companies,  with a focus on growth  stocks in  sectors  of the
          economy  that the Fund  believes  have high growth  potential.  Growth
          stocks are issued by companies that the Fund believes are fast-growing
          and  whose  earnings  are  likely to  increase  over  time.  Growth in
          earnings may lead to an increase in the price of the stock. The growth
          sectors     currently      emphasized     include      communications,
          media/entertainment,  medical technology/cost containment,  industrial
          and environmental  services,  applied/advanced  technology,  financial
          services,  consumer products and services and business  services.  The
          Fund may  invest  in  companies  of any size.  The  return on the Fund
          varies as the stock  markets  fluctuate  and there is no  guarantee of
          principal or rate of return.

      d.  Putnam   International   Growth   Fund  -  The  Fund   seeks   capital
          appreciation.  The Fund invests  mainly in common  stocks of companies
          outside the United  States.  The Fund first  selects the countries and
          industries  it believes are  attractive,  then seeks  stocks  offering
          opportunity  for gain.  The Fund looks for companies with stock prices
          that  reflect a value  lower  than that  which the Fund  places on the
          company or whose  earnings  the Fund  believes are likely to grow over
          time.  The Fund also looks for the  presence of factors it thinks will
          cause  the  stock  price to  increase.  The  Fund  invests  mainly  in
          mid-sized and large companies,  although it can invest in companies of
          any  size.  Although  the Fund  emphasizes  investments  in  developed
          countries, it may also invest in companies located in developing (also
          known as emerging) markets. The return of the Fund varies as the stock
          markets  fluctuate  and there is no  guarantee of principal or rate of
          return.

      e.  Vanguard Windsor II Fund - The Fund seeks to provide  long-term growth
          of capital. As a secondary  objective,  the Fund seeks to provide some
          dividend income.  The Fund invests primarily in large and medium-sized
          companies  whose stocks are considered by the Fund to be  undervalued.
          Undervalued  stocks  are  generally  those  that are out of favor with
          investors and currently  trading at prices that,  the Fund feels,  are
          below what the stocks are worth in relation to their  earnings.  These
          stocks   typically,   but  not   always,   have  lower  than   average
          price/earnings (P/E) ratios and  higher than average  dividend yields.
          The return of the Fund varies as the stock markets fluctuate and there
          is no guarantee of principal or rate of return.

      f.  Putnam S&P 500 Index Fund - The Fund seeks to achieve a return, before
          the assessment of any fees,  that closely  approximates  the return of
          the Standard & Poor's 500 Composite Stock Price Index (the "Index"), a
          common  measure of United  States  market  performance.  The Fund will
          invest  primarily in the securities that constitute the Index,  either
          directly or through the  purchase of shares of  collective  investment
          trusts having investment  objectives  similar to that of the Fund. The
          Index is a broad  market-weighted  composite  of 500  selected  common
          stocks,  most of which  are  listed  on the New York  Stock  Exchange.
          Except as set forth below,  the Fund attempts to be fully  invested at
          all times in the stocks  that  compose  the Index  either  directly or
          through

                                       -7-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------


      collective  investment  trusts.  However,  it is not anticipated  that the
      Fund's  portfolio will duplicate the Index exactly.  To maintain  adequate
      liquidity,  the  Fund  may  invest  a  small  portion  of  its  assets  in
      high-quality  money  market  instruments  and in money  market  funds that
      invest  exclusively in high-quality  money market  instruments.  To manage
      transaction  costs and minimize  tracking  errors between the Fund and the
      Index,  the  Fund  may  invest  in  exchange-traded  stock  index  futures
      contracts.  The return of the Fund varies as the stock  markets  fluctuate
      and there is no guarantee of principal or rate of return.

      g.  Comcast Corporation Stock Fund - The assets of the Comcast Corporation
          Stock Fund are invested in the Company's Class A Special Common Stock.
          The Fund  purchases the stock at  prevailing  rates in the open market
          and, in the normal  course of  business,  sells such stock to meet the
          distribution   requirements  of  the  Plan.  The  value  of  the  Fund
          fluctuates and there is no guarantee of principal or rate of return.

      h.  Comcast Stable Value Fund - The Fund emphasizes stability of principal
          while seeking to earn a competitive  rate of return.  The Fund invests
          in investment contracts issued by insurance companies, banks and other
          financial  institutions.  The Fund may also invest in  security-backed
          investment   contracts  that  consist  of  one  or  more  fixed-income
          securities and a wrap contract issued by an insurance company, bank or
          other financial  institution.  The wrap contract  provides  book-value
          liquidity for benefit  payments and offers  enhanced  diversification.
          The interest rates credited under security-backed investment contracts
          may vary  based on the  performance  of the  specific  securities  and
          withdrawal experience.

      i.  Jones  Intercable  Stock Fund - As of December 31, 1999, the assets of
          the Jones Intercable Stock Fund were invested in Jones' Class A Common
          Stock. The Fund was a former fund of the Jones Intercable,  Inc. Et Al
          Profit  Sharing/Retirement  Plan and became an investment  fund of the
          Plan when the Jones Plans were merged with and into the Plan (see Note
          2). The Fund was frozen effective on the merger date, and no purchases
          of the Jones Class A Common  Stock were  subsequently  made.  The Fund
          sold  such  stock  in the  normal  course  of  business  to  meet  the
          distribution   requirements  of  the  Plan.  On  March  2,  2000,  the
          shareholders  of Jones approved a merger pursuant to which the Company
          acquired  all of the  remaining  shares of Jones not then owned by the
          Company.  As a result,  Jones was merged  with and into  Comcast  JOIN
          Holdings,  Inc., a wholly- owned  subsidiary  of the Company,  on that
          date and Jones common stock ceased to be publicly-traded.  Each former
          Jones  stockholder  received  1.4  shares of  Comcast  Class A Special
          Common Stock for each share of Jones common stock. Each share of Jones
          Class A Common Stock invested in the Jones  Intercable  Stock Fund was
          converted  into 1.4  shares of the  Company's  Class A Special  Common
          Stock and invested in the Comcast Corporation Stock Fund.

      The  selection of  investments  from the options  listed above is the sole
      responsibility  of each  participant.  Each participant  assumes all risks
      connected with any decrease in the market value of any securities in these
      funds,  and such funds are the sole source of payments  under the Plan. If
      no  investment  direction  is made  by a  participant,  the  participant's
      account is invested in the Comcast  Stable Value Fund at the  direction of
      the Plan Administrator.

                                       -8-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------


4.    INVESTMENTS

      The Plan's  investments  are held by a trust fund and are presented in the
      following  table.  Investments that represent 5% or more of the Plan's net
      assets  available  for  benefits  as of  December  31,  2000  and 1999 are
      separately  identified  (number of units/shares are rounded to the nearest
      whole unit or share).




                                                                         December 31, 2000
                                                             -----------------------------------------
                                                                                            Fair or
                                                                  Number of                 Contract
                                                                 Units/Shares                Value
                                                             ------------------         --------------
                                                                                   
            Mutual Funds
                Dodge and Cox Balanced Fund                     481,899  units            $ 30,562,037
                Putnam Investors Fund                         3,521,321  units              54,474,835
                Putnam New Opportunities Fund                   314,337  units              18,816,193
                Putnam International Growth Fund                648,560  units              16,084,287
                Vanguard Windsor II Fund                        450,509  units              12,253,847
                Putnam S&P 500 Index Fund                       612,289  units              19,397,329
                                                                                        --------------
                                                                                           151,588,528
                                                                                        --------------
            Comcast Corporation Stock Fund
                Class A Special Common Stock                  3,091,635  shares            129,075,764
                Cash                                                                           777,957
                                                                                        --------------
                                                                                           129,853,721
                                                                                        --------------

            Comcast Stable Value Fund
                The Putnam Stable Value Fund                 32,367,133  units              32,367,133
                Other investment contracts                   23,894,778  units              23,894,778
                                                                                        --------------
                                                                                            56,261,911
                                                                                        --------------

            Participant Loan Fund
                (interest rates from 6.28% to 11.00%;
                maturities from 2001 to 2010)                                                9,620,740
                                                                                        --------------
                                                                                          $347,324,900
                                                                                        ==============


                                       -9-


COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Continued)
--------------------------------------------------------------------------------





                                                                           December 31, 1999
                                                              -------------------------------------------
                                                                                             Fair or
                                                                 Number of                   Contract
                                                                Units/Shares                  Value
                                                             ------------------           --------------
                                                                                     
            Mutual Funds
                Dodge and Cox Balanced Fund                       375,365  units            $ 24,665,250
                Putnam Investors Fund                           3,583,136  units              68,975,376
                Putnam New Opportunities Fund                     170,183  units              15,726,582
                Putnam International Growth Fund                  444,319  units              13,236,255
                Vanguard Windsor II Fund                          222,590  units               5,558,064
                Putnam S&P 500 Index Fund                         548,571  units              19,167,068
                                                                                          --------------
                                                                                             147,328,595
                                                                                          --------------
            Comcast Corporation Stock Fund
                Class A Special Common Stock                    2,778,316  shares            140,478,600
                Cash                                                                             297,530
                                                                                          --------------
                                                                                             140,776,130
                                                                                          --------------

            Comcast Stable Value Fund
                The Putnam Stable Value Fund                   26,102,385  units              26,102,385
                Other investment contracts                     32,007,591  units              32,007,591
                                                                                          --------------
                                                                                              58,109,976
                                                                                          --------------

            Jones Intercable Stock Fund
                Class A Common Stock                               76,875  shares              5,328,421
                                                                                          --------------

            Participant Loan Fund
                (interest rates from 6.28% to 11.50%;
                maturities from 2000 to 2010)                                                  8,910,690
                                                                                          --------------
                                                                                            $360,453,812
                                                                                          ==============


      The  contract  and fair values of assets  included  in the Comcast  Stable
      Value Fund were $56,261,911 and $56,936,205,  respectively, as of December
      31, 2000.  The contract and fair values of assets  included in the Comcast
      Stable Value Fund were  $58,109,976 and $57,990,792,  respectively,  as of
      December 31, 1999.  The average yield of investment  contracts  held as of
      December 31, 2000 and 1999 was 6.41% and 6.22%, respectively.  The average
      yield on investment  contracts  for the years ended  December 31, 2000 and
      1999 was 6.11% and 6.09%, respectively.

5.    PARTICIPANT LOANS AND HARDSHIP WITHDRAWALS

      A participant may borrow from his/her Plan account subject to the approval
      of the Plan Administrator in accordance with applicable regulations issued
      by the Internal  Revenue  Service  ("IRS") and the Department of Labor. In
      general, a participant may borrow a minimum of $500 up to a maximum of the
      lesser  of  $50,000  or 50% of the  participant's  nonforfeitable  accrued
      benefit on the valuation  date (as defined by the Plan) last preceding the
      date on which the loan request is processed by the Plan Administrator. The
      maximum term of a loan made pursuant to the Plan is five years (loans with
      terms of  greater  than  five  years  exist  under the Plan as a result of
      rollovers  from  merged  plans).  Interest  accrues  at a rate  charged by
      commercial  lenders for comparable  loans on the date the loan application
      is approved.  Loan  transactions  are treated as a transfer  from (to) the
      investment fund to (from) the participant loan fund.

      A participant  may withdraw all or a portion of his/her  benefits  derived
      from  salary  reduction,  rollovers  or the  vested  portion  of  employer
      contributions, and earnings thereon, on account of hardship, as defined by
      the Plan

                                      -10-



COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000, 1999 AND 1998 (Concluded)
--------------------------------------------------------------------------------


      and applicable IRS  regulations.  Under these rules,  the participant must
      exhaust  the  possibilities  of  all  other  distributions,   loans,  etc.
      available  under  the Plan  and  meet  certain  other  requirements.  Upon
      receiving a hardship withdrawal,  the participant's elective contributions
      are suspended for twelve full calendar months.

6.    ADMINISTRATION OF THE PLAN

      The  Company,  as Plan  Administrator,  has the  authority  to control and
      manage the operation and  administration  of the Plan and may delegate all
      or a portion of the  responsibilities  of  controlling  and  managing  the
      operation and administration of the Plan to one or more persons.

7.    FEDERAL TAX CONSIDERATIONS

      a.  Income  Tax  Status of the Plan - The Plan  received  a  determination
          letter dated  December 19, 1995 in which the IRS stated that the Plan,
          as amended and restated  effective  January 1, 1993,  is qualified and
          that the trust established under the Plan is tax-exempt.  The Plan has
          been amended since  receiving the  determination  letter (see Note 2).
          The Company  believes  that the Plan  continues  to comply in form and
          operation with the applicable requirements of the Code. Therefore, the
          Company believes that the Plan was qualified and the related trust was
          tax-exempt as of December 31, 2000. Therefore, no provision for income
          taxes has been included in the Plan's financial statements.

      b.  Impact  on Plan  Participants  -  Matching  contributions  and  salary
          reduction  contributions,  as well as  earnings  on Plan  assets,  are
          generally not subject to federal income tax until  distributed  from a
          qualified plan that meets the requirements of Sections 401(a),  401(k)
          and 401(m) of the Code.



                                      -11-





COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN
----------------------------------------------

SCHEDULE H - LINE 4i - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
DECEMBER 31, 2000
-------------------------------------------------------------------------------------------------------------------


                                                                                                 FEIN #23-1709202
                                                                                                 PLAN #001


                                                                             Description of
                                                                              Investment,              Fair or
                             Identity of                                   Including Maturity         Contract
                       Issue, Borrower, Lessor                          Date, Rate of Interest,        Value
                           or Similar Party                              Par or Maturity Value
--------------------------------------------------------------------   -------------------------   ---------------
                                                                                              

Mutual Funds
     Dodge and Cox Balanced Fund                                                   481,899 units      $ 30,562,037
     Putnam Investors Fund                                                       3,521,321 units        54,474,835
     Putnam New Opportunities Fund                                                 314,337 units        18,816,193
     Putnam International Growth Fund                                              648,560 units        16,084,287
     Vanguard Windsor II Fund                                                      450,509 units        12,253,847
     Putnam S&P 500 Index Fund                                                     612,289 units        19,397,329
                                                                                                     -------------
                                                                                                       151,588,528
                                                                                                     -------------

Comcast Corporation* Stock Fund
     Class A Special Common Stock                                                3,091,635 shares      129,075,764
     Cash                                                                                                  777,957
                                                                                                     -------------
                                                                                                       129,853,721
                                                                                                     -------------

Comcast Stable Value Fund
     The Putnam Stable Value Fund                                               32,367,133 units        32,367,133
                                                                                                     -------------

     Traditional Investment Contracts
       GE Life & Annuity Assurance Co.; 12/16/02 Maturity; 6.00%                 1,186,272 units         1,186,272
       John Hancock Life Insurance Co.; 11/22/02 Maturity; 5.83%                 1,507,237 units         1,507,237
       Ohio National Life Insurance Co.; 3/14/03 Maturity; 6.26%                 1,193,234 units         1,193,234
       Pacific Life Insurance Co.; 4/15/03 Maturity; 5.15%                       2,236,828 units         2,236,828
       Principal Life Insurance Co.; 5/15/03 Maturity; 5.45%                     1,682,304 units         1,682,304
       SAFECO; 9/16/02 Maturity; 6.93%                                           1,406,358 units         1,406,358
       Transamerica Occidental; 1/16/01 Maturity; 5.76%                          1,981,085 units         1,981,065
                                                                                                     -------------
                                                                                                        11,193,298
                                                                                                     -------------

     Security-Backed Investment Contracts
       Bankers Trust; 9/15/02 Maturity; 6.42%                                    2,246,701 units         2,246,701
       Caisse des Depots; 12/24/01 Maturity; 6.54%                               2,316,726 units         2,316,726
       Monumental Life Insurance Co.; 5/15/01 Maturity; 6.90%                    1,136,174 units         1,136,174
       Westdeutsche Landsbank; 2/25/03 Maturity; 6.42%                           2,000,611 units         2,000,611
       Westdeutsche Landsbank; 9/7/03 Maturity; 6.72%                            2,000,041 units         2,000,041
       Westdeutsche Landsbank; 9/15/02 Maturity; 6.78%                           3,001,227 units         3,001,227
                                                                                                     -------------
                                                                                                        12,701,480
                                                                                                     -------------

                                                                                                        56,261,911
                                                                                                     -------------

Participant Loan Fund
     (Interest rates from 6.28% to 11.00%;
     maturities from 2001 to 2010)                                                                       9,620,740
                                                                                                     -------------
                                                                                                      $347,324,900
                                                                                                     =============

* Represents a party-in-interest to the Plan.


                                      -12-





INDEPENDENT AUDITORS' CONSENT

We consent to the  incorporation  by reference  in  Registration  Statement  No.
33-63223 of Comcast  Corporation  on Form S-8 of our report  dated June 22, 2001
appearing  in  the  Annual  Report  on  Form  11-K  of the  Comcast  Corporation
Retirement-Investment Plan for the year ended December 31, 2000.




/s/ DELOITTE & TOUCHE LLP
Philadelphia, Pennsylvania
June 28, 2001


                                      -13-



                                    SIGNATURE





Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
trustees (or other persons who administer  the employee  benefit plan) have duly
caused this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.





                                           THE COMCAST CORPORATION
                                            RETIREMENT-INVESTMENT PLAN


                                           By:  Comcast Corporation
                                                Plan Administrator


June 28, 2001                              By:  /s/ Lawrence J. Salva
                                                --------------------------------
                                                Lawrence J. Salva
                                                Senior Vice President and Chief
                                                Accounting Officer




                                      -14-