CBS Corp – ‘SC 13D/A’ on 11/3/04 re: Marketwatch Inc – EX-1

On:  Wednesday, 11/3/04, at 9:40pm ET   ·   As of:  11/4/04   ·   Accession #:  947871-4-2477   ·   File #:  5-79480

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Amendment to General Statement of Beneficial Ownership   —   Schedule 13D
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: SC 13D/A    Amendment No. 1                                       32    146K 
 2: EX-1        Joint Filing Agreement                                 2±     7K 

EX-1   —   Joint Filing Agreement

                                                                       Exhibit 1

JOINT FILING AGREEMENT

        The undersigned hereby agree that the Statement on Schedule 13D, dated
January 26, 2004 (the "Schedule 13D"), with respect to the Common Stock, par    
value $0.01 per share, of MarketWatch.com, Inc., is, and any amendments executed
by us shall be, filed on behalf of each of us pursuant to and in accordance with
the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as   
amended, and that this Agreement shall be included as an exhibit to the Schedule
13D and each such amendment. Each of the undersigned agrees to be responsible   
for the timely filing of the Schedule 13D and any amendments thereto, and for   
the completeness and accuracy of the information concerning itself contained    
therein. This agreement may be executed in any number of counterparts, all of   
which taken together shall constitute one and the same instrument.              

        IN WITNESS WHEREOF, the undersigned have executed this Agreement as of
the 26th day of January 2004.                                                   

                       CBS Broadcasting Inc.

                               By:   /s/ Michael D. Fricklas
                                              ----------------------------------
                               Michael D. Fricklas
                                    Executive Vice President

                                        Westinghouse CBS Holding Company, Inc.

                               By:   /s/ Michael D. Fricklas
                                              ----------------------------------
                               Michael D. Fricklas
                                    Executive Vice President

             Viacom Inc.

                               By:   /s/ Michael D. Fricklas
                                              ----------------------------------
                               Michael D. Fricklas
                                    Executive Vice President

             NAIRI, Inc.

                              By:   /s/ Sumner M. Redstone
                                              ----------------------------------
                              Sumner M. Redstone
                                  Chairman and President

                           National Amusements, Inc.

                              By:   /s/ Sumner M. Redstone
                                              ----------------------------------
                              Sumner M. Redstone
                                        Chairman and Chief Executive
                   Officer

                                    /s/ Sumner M. Redstone
                                              ----------------------------------
                              Sumner M. Redstone
                        Individually

Dates Referenced Herein   and   Documents Incorporated by Reference

This ‘SC 13D/A’ Filing		Date		Other Filings
Filed as of:		11/4/04
Filed on:		11/3/04
		1/26/04		3,  4,  SC 13D
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