Disclaimer

The SEC Filings on this page are provided by EDGAR (www.sec.gov), the Electronic Data Gathering, Analysis, and Retrieval System of the U.S. Securities and Exchange Commission (SEC). EDGAR performs automated collection, validation, indexing, acceptance, and forwarding of submissions by companies and others who are required by law to file forms with the SEC. The information here is provided for your convenience only. Comcast has no control over the information provided by EDGAR and cannot guarantee the sequence, accuracy, or completeness of any information or data displayed through EDGAR. Accordingly, Comcast does not accept any responsibility for the content or use of any information obtained through EDGAR.

Consult Your Tax Advisor

The information in this document represents our understanding of federal income tax laws and regulations, but does not constitute personal tax advice based on your specific situation. It does not purport to be complete or to describe the consequences that may apply to you given your particular taxes. You should consult your own tax advisor regarding the applicability of any state, local and foreign tax laws.

                       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


                              COMCAST CORPORATION
                            [GRAPHIC OMITTED - LOGO]








(Mark One):

   __X__  ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT
          OF 1934.
          For the fiscal year ended December 31, 1998.

                                       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, 1998 and 1997 and for each of the Three Years in the Period Ended December 31, 1998; Supplemental Schedules as of and for the Year Ended December 31, 1998; 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 With Fund Information as of December 31, 1998 and 1997 2 Statement of Changes in Net Assets Available for Benefits With Fund Information for the Years Ended December 31, 1998, 1997 and 1996 3-5 Notes to Financial Statements 6-10 SUPPLEMENTAL SCHEDULES: Line 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 11 Line 27d - Schedule of Reportable Transactions for the Year Ended December 31, 1998 12 INDEPENDENT AUDITORS' REPORT 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 with fund information of the Comcast Corporation Retirement-Investment Plan (the "Plan") as of December 31, 1998 and 1997, and the related statement of changes in net assets available for benefits with fund information for each of the three years in the period ended December 31, 1998. 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 generally accepted auditing standards. 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, 1998 and 1997, and the related changes in net assets available for benefits for each of the three years in the period ended December 31, 1998 in conformity with generally accepted accounting principles. Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental information by fund in the statement of net assets available for benefits with fund information and the statement of changes in net assets available for benefits with fund information is presented for the purpose of additional analysis of the basic financial statements rather than to present information regarding the net assets available for benefits and changes in net assets available for benefits of each fund. The supplemental schedules on pages 11 and 12 are presented for the purpose of additional analysis and are not a required part of the basic financial statements, but are 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 information by fund and supplemental schedules are the responsibility of the Plan's management. The supplemental information by fund and supplemental schedules have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are 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 24, 1999 - 1 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN - ---------------------------------------------- STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION DECEMBER 31, 1998 AND 1997 - -------------------------------------------------------------------------------- Mutual Funds --------------------------------------------------------------------------- Dodge and Fidelity Blue Ivy Cox Balanced Chip Growth PBHG International Total Mutual Fund Fund Growth Fund Fund Funds ----------- ----------- ----------- ----------- ----------- DECEMBER 31, 1998 ASSETS Investments, at fair or contract value $21,852,109 $54,561,445 $ 6,036,037 $ 5,601,842 $88,051,433 Cash Loans receivable from participants ----------- ----------- ----------- ----------- ----------- NET ASSETS AVAILABLE FOR BENEFITS $21,852,109 $54,561,445 $ 6,036,037 $ 5,601,842 $88,051,433 =========== =========== =========== =========== =========== DECEMBER 31, 1997 ASSETS Investments, at fair or contract value $20,218,907 $39,071,781 $ 5,695,881 $ 5,688,630 $70,675,199 Cash Loans receivable from participants ----------- ----------- ----------- ----------- ----------- NET ASSETS AVAILABLE FOR BENEFITS $20,218,907 $39,071,781 $ 5,695,881 $ 5,688,630 $70,675,199 =========== =========== =========== =========== =========== Total Comcast Stable Value Investment Participant Stock Fund Fund Funds Loan Fund Total ------------ ------------ ------------ ------------ ------------ DECEMBER 31, 1998 ASSETS Investments, at fair or contract value $ 68,821,432 $ 34,741,046 $191,613,911 $ $191,613,911 Cash 7,509,536 5,793,376 13,302,912 13,302,912 Loans receivable from participants 6,338,905 6,338,905 ------------ ------------ ------------ ------------ ------------ NET ASSETS AVAILABLE FOR BENEFITS $ 76,330,968 $ 40,534,422 $204,916,823 $ 6,338,905 $211,255,728 ============ ============ ============ ============ ============ DECEMBER 31, 1997 ASSETS Investments, at fair or contract value $ 37,694,328 $ 29,194,986 $137,564,513 $ $137,564,513 Cash 1,450,289 5,079,040 6,529,329 6,529,329 Loans receivable from participants 6,174,371 6,174,371 ------------ ------------ ------------ ------------ ------------ NET ASSETS AVAILABLE FOR BENEFITS $ 39,144,617 $ 34,274,026 $144,093,842 $ 6,174,371 $150,268,213 ============ ============ ============ ============ ============ See notes to financial statements. - 2 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN - ---------------------------------------------- STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION YEAR ENDED DECEMBER 31, 1998 - -------------------------------------------------------------------------------- Mutual Funds ------------------------------------------------------------------------------------ Dodge and Cox Fidelity Blue Ivy Balanced Chip Growth PBHG Growth International Total Mutual Fund Fund Fund Fund Funds ------------ ------------ ------------ ------------ ------------ ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments $ (451,133) $ 11,749,165 $ 20,759 $ 349,453 $ 11,668,244 Interest and dividends 1,886,058 2,230,370 92,759 4,209,187 ------------ ------------ ------------ ------------ ------------ 1,434,925 13,979,535 20,759 442,212 15,877,431 ------------ ------------ ------------ ------------ ------------ Contributions: Employee 2,405,190 4,610,570 1,208,342 1,149,055 9,373,157 Employer 1,096,592 2,140,396 539,247 467,508 4,243,743 ------------ ------------ ------------ ------------ ------------ 3,501,782 6,750,966 1,747,589 1,616,563 13,616,900 ------------ ------------ ------------ ------------ ------------ 4,936,707 20,730,501 1,768,348 2,058,775 29,494,331 ------------ ------------ ------------ ------------ ------------ DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 1,520,891 3,506,735 412,058 488,497 5,928,181 ------------ ------------ ------------ ------------ ------------ 1,520,891 3,506,735 412,058 488,497 5,928,181 ------------ ------------ ------------ ------------ ------------ Net increase (decrease) prior to interfund transfers 3,415,816 17,223,766 1,356,290 1,570,278 23,566,150 Loan repayments--principal 321,940 633,852 107,941 117,918 1,181,651 Loan withdrawals (328,828) (770,731) (108,968) (100,883) (1,309,410) Other interfund transfers (1,775,726) (1,597,223) (1,015,107) (1,674,101) (6,062,157) ------------ ------------ ------------ ------------ ------------ Net increase (decrease) 1,633,202 15,489,664 340,156 (86,788) 17,376,234 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 20,218,907 39,071,781 5,695,881 5,688,630 70,675,199 ------------ ------------ ------------ ------------ ------------ End of year $ 21,852,109 $ 54,561,445 $ 6,036,037 $ 5,601,842 $ 88,051,433 ============ ============ ============ ============ ============ Total Comcast Stock Stable Value Investment Participant Fund Fund Funds Loan Fund Total ------------- ------------- ------------- ------------- ------------- ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments $ 32,155,179 $ $ 43,823,423 $ $ 43,823,423 Interest and dividends 340,913 2,343,130 6,893,230 6,893,230 ------------- ------------- ------------- ------------- ------------- 32,496,092 2,343,130 50,716,653 50,716,653 ------------- ------------- ------------- ------------- ------------- Contributions: Employee 3,825,451 2,564,913 15,763,521 15,763,521 Employer 2,197,074 1,642,510 8,083,327 8,083,327 ------------- ------------- ------------- ------------- ------------- 6,022,525 4,207,423 23,846,848 23,846,848 ------------- ------------- ------------- ------------- ------------- 38,518,617 6,550,553 74,563,501 74,563,501 ------------- ------------- ------------- ------------- ------------- DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 3,272,382 3,697,640 12,898,203 677,783 13,575,986 ------------- ------------- ------------- ------------- ------------- 3,272,382 3,697,640 12,898,203 677,783 13,575,986 ------------- ------------- ------------- ------------- ------------- Net increase (decrease) prior to interfund transfers 35,246,235 2,852,913 61,665,298 (677,783) 60,987,515 Loan repayments--principal 583,396 751,538 2,516,585 (2,516,585) Loan withdrawals (1,158,161) (891,331) (3,358,902) 3,358,902 Other interfund transfers 2,514,881 3,547,276 ------------- ------------- ------------- ------------- ------------- Net increase (decrease) 37,186,351 6,260,396 60,822,981 164,534 60,987,515 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 39,144,617 34,274,026 144,093,842 6,174,371 150,268,213 ------------- ------------- ------------- ------------- ------------- End of year $ 76,330,968 $ 40,534,422 $ 204,916,823 $ 6,338,905 $ 211,255,728 ============= ============= ============= ============= ============= See notes to financial statements. - 3 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN - ---------------------------------------------- STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION YEAR ENDED DECEMBER 31, 1997 - -------------------------------------------------------------------------------- Mutual Funds ------------------------------------------------------------------------------------ Dodge and Fidelity Blue Ivy Cox Balanced Chip Growth PBHG International Total Mutual Fund Fund Growth Fund Fund Funds ------------ ------------ ------------ ------------ ------------ ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments $ 1,792,883 $ 5,929,901 $ (67,073) $ 274,312 $ 7,930,023 Interest and dividends 1,532,461 1,884,234 133,488 3,550,183 ------------ ------------ ------------ ------------ ------------ 3,325,344 7,814,135 (67,073) 407,800 11,480,206 ------------ ------------ ------------ ------------ ------------ Contributions: Employee 3,121,095 5,240,073 1,535,385 2,047,378 11,943,931 Employer 898,586 1,649,103 390,842 423,160 3,361,691 ------------ ------------ ------------ ------------ ------------ 4,019,681 6,889,176 1,926,227 2,470,538 15,305,622 ------------ ------------ ------------ ------------ ------------ 7,345,025 14,703,311 1,859,154 2,878,338 26,785,828 ------------ ------------ ------------ ------------ ------------ DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 997,293 2,370,839 352,551 340,298 4,060,981 ------------ ------------ ------------ ------------ ------------ 997,293 2,370,839 352,551 340,298 4,060,981 ------------ ------------ ------------ ------------ ------------ Net increase (decrease) prior to interfund transfers 6,347,732 12,332,472 1,506,603 2,538,040 22,724,847 Loan repayments--principal 251,296 508,748 83,815 98,235 942,094 Loan withdrawals (538,711) (988,514) (185,809) (231,170) (1,944,204) Other interfund transfers 637,979 775,677 807,746 979,714 3,201,116 ------------ ------------ ------------ ------------ ------------ Net increase 6,698,296 12,628,383 2,212,355 3,384,819 24,923,853 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 13,520,611 26,443,398 3,483,526 2,303,811 45,751,346 ------------ ------------ ------------ ------------ ------------ End of year $ 20,218,907 $ 39,071,781 $ 5,695,881 $ 5,688,630 $ 70,675,199 ============ ============ ============ ============ ============ Total Comcast Stock Stable Value Investment Participant Fund Fund Funds Loan Fund Total ------------- ------------- ------------- ------------- ------------- ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments $ 16,106,341 $ $ 24,036,364 $ $ 24,036,364 Interest and dividends 272,014 2,071,125 5,893,322 5,893,322 ------------- ------------- ------------- ------------- ------------- 16,378,355 2,071,125 29,929,686 29,929,686 ------------- ------------- ------------- ------------- ------------- Contributions: Employee 2,990,886 3,450,752 18,385,569 18,385,569 Employer 1,352,577 1,048,735 5,763,003 5,763,003 ------------- ------------- ------------- ------------- ------------- 4,343,463 4,499,487 24,148,572 24,148,572 ------------- ------------- ------------- ------------- ------------- 20,721,818 6,570,612 54,078,258 54,078,258 ------------- ------------- ------------- ------------- ------------- DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 1,865,843 2,705,193 8,632,017 344,417 8,976,434 ------------- ------------- ------------- ------------- ------------- 1,865,843 2,705,193 8,632,017 344,417 8,976,434 ------------- ------------- ------------- ------------- ------------- Net increase (decrease) prior to interfund transfers 18,855,975 3,865,419 45,446,241 (344,417) 45,101,824 Loan repayments--principal 398,924 653,884 1,994,902 (1,994,902) Loan withdrawals (910,792) (999,704) (3,854,700) 3,854,700 Other interfund transfers (2,750,470) (450,646) ------------- ------------- ------------- ------------- ------------- Net increase 15,593,637 3,068,953 43,586,443 1,515,381 45,101,824 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 23,550,980 31,205,073 100,507,399 4,658,990 105,166,389 ------------- ------------- ------------- ------------- ------------- End of year $ 39,144,617 $ 34,274,026 $ 144,093,842 $ 6,174,371 $ 150,268,213 ============= ============= ============= ============= ============= See notes to financial statements. - 4 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN - ---------------------------------------------- STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS WITH FUND INFORMATION YEAR ENDED DECEMBER 31, 1996 - -------------------------------------------------------------------------------- Mutual Funds ------------------------------------------------------------------------------------------- Dodge and Fidelity Blue Crabbe PBHG Ivy Cox Balanced Chip Growth Huson Growth International Total Mutual Fund Fund Fund Fund Fund Funds ------------ ------------ ------------ ------------ ------------ ------------ ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments $ 1,123,805 $ 1,608,398 $ 63,591 $ $ 162,970 $ 2,958,764 Interest and dividends 570,737 1,799,338 108,042 2,478,117 ------------ ------------ ------------ ------------ ------------ ------------ 1,694,542 3,407,736 171,633 162,970 5,436,881 ------------ ------------ ------------ ------------ ------------ ------------ Contributions: Employee 1,776,306 3,555,790 470,359 490,235 6,292,690 Employer 678,511 1,351,871 144,218 146,388 2,320,988 ------------ ------------ ------------ ------------ ------------ ------------ 2,454,817 4,907,661 614,577 636,623 8,613,678 ------------ ------------ ------------ ------------ ------------ ------------ 4,149,359 8,315,397 786,210 799,593 14,050,559 ------------ ------------ ------------ ------------ ------------ ------------ DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 1,129,067 1,977,471 409,861 49,756 3,566,155 ------------ ------------ ------------ ------------ ------------ ------------ 1,129,067 1,977,471 409,861 49,756 3,566,155 ------------ ------------ ------------ ------------ ------------ ------------ Net increase (decrease) prior to interfund transfers 3,020,292 6,337,926 376,349 749,837 10,484,404 Loan repayments--principal 195,087 402,499 43,019 48,267 688,872 Loan withdrawals (456,997) (973,427) (256,393) (54,233) (1,741,050) Other interfund transfers (10,487) 755,638 (3,253,617) 3,483,526 1,559,940 2,535,000 ------------ ------------ ------------ ------------ ------------ ------------ Net increase (decrease) 2,747,895 6,522,636 (3,090,642) 3,483,526 2,303,811 11,967,226 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 10,772,716 19,920,762 3,090,642 33,784,120 ------------ ------------ ------------ ------------ ------------ ------------ End of year $ 13,520,611 $ 26,443,398 $ $ 3,483,526 $ 2,303,811 $ 45,751,346 ============ ============ ============ ============ ============ ============ Total Comcast Stock Stable Value Investment Participant Fund Fund Funds Loan Fund Total ------------- ------------- ------------- ------------- ------------- ADDITIONS TO NET ASSETS ATTRIBUTED TO: Investment income: Net realized and unrealized appreciation (depreciation) in fair value of investments ($ 324,354) $ $ 2,634,410 $ $ 2,634,410 Interest and dividends 225,709 2,064,686 4,768,512 4,768,512 ------------- ------------- ------------- ------------- ------------- (98,645) 2,064,686 7,402,922 7,402,922 ------------- ------------- ------------- ------------- ------------- Contributions: Employee 2,558,327 3,132,940 11,983,957 11,983,957 Employer 1,499,994 1,267,824 5,088,806 5,088,806 ------------- ------------- ------------- ------------- ------------- 4,058,321 4,400,764 17,072,763 17,072,763 ------------- ------------- ------------- ------------- ------------- 3,959,676 6,465,450 24,475,685 24,475,685 ------------- ------------- ------------- ------------- ------------- DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO: Benefits paid to participants or beneficiaries 1,890,472 4,208,171 9,664,798 273,827 9,938,625 ------------- ------------- ------------- ------------- ------------- 1,890,472 4,208,171 9,664,798 273,827 9,938,625 ------------- ------------- ------------- ------------- ------------- Net increase (decrease) prior to interfund transfers 2,069,204 2,257,279 14,810,887 (273,827) 14,537,060 Loan repayments--principal 361,764 574,028 1,624,664 (1,624,664) Loan withdrawals (801,711) (1,598,338) (4,141,099) 4,141,099 Other interfund transfers 570,166 (3,105,166) ------------- ------------- ------------- ------------- ------------- Net increase (decrease) 2,199,423 (1,872,197) 12,294,452 2,242,608 14,537,060 NET ASSETS AVAILABLE FOR BENEFITS: Beginning of year 21,351,557 33,077,270 88,212,947 2,416,382 90,629,329 ------------- ------------- ------------- ------------- ------------- End of year $ 23,550,980 $ 31,205,073 $ 100,507,399 $ 4,658,990 $ 105,166,389 ============= ============= ============= ============= ============= See notes to financial statements. - 5 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN NOTES TO FINANCIAL STATEMENTS YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 - -------------------------------------------------------------------------------- 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 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 matured securities exchange or the Nasdaq National Market. Investment contracts which are included in the 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 absorbed by Comcast Corporation ("Comcast," the "Company" or the "Plan Administrator"). The preparation of financial statements in conformity with generally accepted accounting principles 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 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"). An employee is eligible for participation in the Plan upon completion of one year of service, as defined in the Plan (see Note 9). 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. The Company matches 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 (see Note 9). 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 vest 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 The Company contributes cash to purchase 10 shares of the Company's Class A Special Common Stock for the account of each newly eligible participant (see Note 9). These contributions are recorded at the market value of the shares at the date contributed. - 6 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN NOTES TO FINANCIAL STATEMENTS YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 (Continued) - -------------------------------------------------------------------------------- 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") (see Note 9) 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 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 or any combination of the foregoing. 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. 3. INVESTMENT OPTIONS Upon enrollment in the Plan, a participant may direct employer and employee contributions in whole percentage increments among one or more of the funds listed below (see Note 9). A brief summary of the Funds, as described in each Fund's prospectus (where applicable), is as follows: a. Dodge and Cox Balanced Fund - The assets of the Dodge and Cox Balanced Fund are invested in equity securities and fixed income obligations issued by corporations. 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. Fidelity Blue Chip Growth Fund - The assets of the Fidelity Blue Chip Growth Fund are invested in equity securities of well-established companies. The returns on these investments vary as the stock markets fluctuate and there is no guarantee of principal or rate of return. c. PBHG Growth Fund - The assets of the PBHG Growth Fund are invested primarily in equity securities of mid-sized companies. The returns on these investments vary as the stock markets fluctuate and there is no guarantee of principal or rate of return. The PBHG Growth Fund replaced the Crabbe Huson Fund effective December 31, 1996. d. Ivy International Fund - The assets of the Ivy International Fund are invested in equity securities which are principally traded in European, Pacific Basin and Latin American markets. The returns on these investments vary as the stock markets fluctuate and there is no guarantee of principal or rate of return. e. Comcast Stock Fund - The assets of the Comcast Stock Fund, including earnings thereon, are invested in the Company's Class A Special Common Stock. The Trustee 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 Comcast Stock Fund fluctuates and there is no guarantee of principal or rate of return. - 7 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN NOTES TO FINANCIAL STATEMENTS YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 (Continued) - -------------------------------------------------------------------------------- f. Stable Value Fund - The assets of the Stable Value Fund are invested in a diversified group of high-quality, fixed-income investments consisting of investment contracts which are obligations of creditworthy life insurance companies and commercial banks, high-quality debt securities which are held by the Plan within contracts that are intended to minimize market volatility, and short-term money market instruments. The Fund's investment return typically fluctuates within a narrow range as interest rates rise and fall. Although the Fund's objective is to preserve the principal investment, there is a potential for loss if the issuing institutions suffer insolvency. 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 Stable Value Fund at the direction of the Plan Administrator. 4. INVESTMENTS The Plan's investments are held by a bank-administered 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, 1998 and 1997 are separately identified (number of shares/units are rounded to the nearest whole share or unit). Class A Special Common Stock (Comcast Stock Fund) share amounts have been adjusted retroactively to reflect the stock split in the form of a dividend of one share of Class A Special Common Stock for each share of Class A Special Common Stock paid on May 5, 1999 to shareholders of record as of the close of business on April 20, 1999. December 31, 1998 --------------------------------------- Fair or Number of Contract Shares/Units Value ---------------- --------------- Mutual Funds Dodge and Cox Balanced Fund 261,878 $21,852,109 Fidelity Blue Chip Growth Fund 898,714 54,561,445 PBHG Growth Fund 423,336 6,036,037 Ivy International Fund 128,900 5,601,842 ------------ 88,051,433 ------------ Comcast Stock Fund Class A Special Common Stock 2,345,352 68,821,432 Cash 7,509,536 ------------ 76,330,968 ------------ Stable Value Fund Investment Contracts 3,374,145 34,741,046 Cash 5,793,376 ------------ 40,534,422 ------------ Participant Loan Fund (interest rates from 7.00% to 10.00%; maturities from 1999 to 2003) 6,338,905 ------------ $211,255,728 ============ - 8 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN NOTES TO FINANCIAL STATEMENTS YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 (Continued) - -------------------------------------------------------------------------------- December 31, 1997 --------------------------------------- Fair or Number of Contract Shares/Units Value ---------------- --------------- Mutual Funds Dodge and Cox Balanced Fund 258,527 $ 20,218,907 Fidelity Blue Chip Growth Fund 866,413 39,071,781 PBHG Growth Fund 401,843 5,695,881 Ivy International Fund 140,506 5,688,630 ------------- 70,675,199 ------------- Comcast Stock Fund Class A Special Common Stock 2,388,552 37,694,328 Cash 1,450,289 ------------- 39,144,617 ------------- Stable Value Fund Investment Contracts 3,031,265 29,194,986 Cash 5,079,040 ------------- 34,274,026 ------------- Participant Loan Fund (interest rates from 7.00% to 10.00%; maturities from 1998 to 2002) 6,174,371 ------------- $ 150,268,213 ============= The contract and fair values of assets included in the Stable Value Fund were $40,534,422 and $41,082,726, respectively, as of December 31, 1998, and $34,274,026 and $34,327,825, respectively, as of December 31, 1997. The average yield of investment contracts held as of December 31, 1998 and 1997 was 5.97% and 6.18%, respectively. The average yield on investment contracts for the years ended December 31, 1998 and 1997 was 6.14% and 6.16%, respectively. 5. PARTICIPANT LOANS AND HARDSHIP WITHDRAWALS Participants may borrow from their 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, participants 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 is five years. 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. Participants may withdraw all or a portion of their benefits derived from salary reduction, rollovers or the vested portion of their employer contributions, and earnings thereon, on account of hardship, as defined by the Plan 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. - 9 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN NOTES TO FINANCIAL STATEMENTS YEARS ENDED DECEMBER 31, 1998, 1997 AND 1996 (Concluded) - -------------------------------------------------------------------------------- 6. BENEFITS PAYABLE The following is a reconciliation of benefits paid to participants or beneficiaries per the Plan's financial statements to the Plan's Form 5500: Year Ended December 31, 1998 1997 1996 ------------- ------------ ------------ Benefits paid to participants or beneficiaries per the financial statements $13,575,986 $8,976,434 $9,938,625 Add: amounts allocated to withdrawing participants at end of year 57,268 Less: amounts allocated to withdrawing participants at beginning of year (57,268) ------------- ------------ ------------ Benefits paid to participants or beneficiaries per the Form 5500 $13,575,986 $8,919,166 $9,995,893 ============= ============ ============ 7. 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. 8. 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 Notes 2 and 9). 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, 1998. 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. 9. SUBSEQUENT EVENTS Effective for employees hired after January 15, 1999, the Company no longer contributes cash to purchase 10 shares of Class A Special Common Stock for the account of each newly eligible participant. 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, four of the five mutual funds previously provided as investment options under the Plan were replaced with five new mutual funds with similar investment objectives. Subsequent to the Plan year ended December 31, 1998, the Plan Administrator approved changes to the eligibility requirements of the Plan such that an employee is eligible for participation in the Plan upon completion of 91 days of service, as defined in the Plan, provided that eligible employees shall not be entitled to participate in allocations of employer matching contributions under the Plan until after they complete one year of service. The effective date of this change is expected to be during the fourth quarter of 1999. - 10 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN LINE 27a - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES DECEMBER 31, 1998 - -------------------------------------------------------------------------------- FEIN #23-1709202 PLAN #001 Description of Investment, Identity of Including Maturity Date, Fair or Issue, Borrower, Lessor Rate of Interest, Par or Contract or Similar Party Maturity Value Cost Value - -------------------------------------------- ----------------------------- -------------- --------------- Mutual Funds Dodge and Cox Balanced Fund 261,878 shares/units $20,341,393 $21,852,109 Fidelity Blue Chip Growth Fund 898,714 shares/units 38,858,188 54,561,445 PBHG Fund 423,336 shares/units 5,902,967 6,036,037 Ivy International Fund 128,900 shares/units 5,210,982 5,601,842 -------------- --------------- 70,313,530 88,051,433 -------------- --------------- Comcast* Stock Fund Class A Special Common Stock 2,345,352 shares/units** 22,306,926 68,821,432 Cash 7,509,536 7,509,536 -------------- --------------- 29,816,462 76,330,968 -------------- --------------- Stable Value Fund Investment Contracts 3,374,145 shares/units 34,741,046 34,741,046 Cash 5,793,376 5,793,376 -------------- --------------- 40,534,422 40,534,422 -------------- --------------- Participant Loan Fund (Interest rates from 7.00% to 10.00%; maturities from 1999 to 2003) 6,338,905 6,338,905 -------------- --------------- $147,003,319 $211,255,728 ============== =============== * Comcast is a party-in-interest to the Plan. ** Class A Special Common Stock (Comcast Stock Fund) share amounts have been adjusted retroactively to reflect the stock split in the form of a dividend of one share of Class A Special Common Stock for each share of Class A Special Common Stock paid on May 5, 1999 to shareholders of record as of the close of business on April 20, 1999. - 11 -

COMCAST CORPORATION RETIREMENT-INVESTMENT PLAN LINE 27d - SCHEDULE OF REPORTABLE TRANSACTIONS YEAR ENDED DECEMBER 31, 1998 - -------------------------------------------------------------------------------- FEIN #23-1709202 PLAN #001 Current Expense Value of Incurred Asset on Identity of Party Involved/ Purchase Selling Lease with Cost of Transaction Description of Asset Price Price Rental Transaction Asset Date Net Gain - --------------------------------------- ------------ ------------ -------- ----------- ---------- ----------- -------- Category (iii)--Series of Transactions in Excess of 5% of Plan Assets - --------------------------------------- Mutual Funds Dodge and Cox Balanced Fund $ 6,110,520 $ 3,932,381 $ $ $ 3,490,780 $ 3,932,381 $ 441,601 Fidelity Blue Chip Growth Fund 13,695,007 9,600,100 7,554,011 9,600,100 2,046,089 Comcast Stock Fund Class A Special Common Stock 20,654,291 15,542,555 15,034,785 15,542,555 507,770 Stable Value Fund Investment Contracts 30,145,619 23,145,344 23,145,344 23,145,344 There were no category (i), (ii) or (iv) reportable transactions during 1998. - 12 -

INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement Nos. 33-41440 and 33-63223 of Comcast Corporation on Form S-8 of our report dated June 24, 1999 appearing in the Annual Report on Form 11-K of the Comcast Corporation Retirement-Investment Plan for the year ended December 31, 1998. /s/ DELOITTE & TOUCHE LLP Philadelphia, Pennsylvania June 29, 1999 - 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 29, 1999 By: /s/ Joseph J. Euteneuer ---------------------------------------- Joseph J. Euteneuer Vice President and Corporate Controller - 14 -