Exhibit 99.1


                CHIEF EXECUTIVE OFFICER CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



In  connection  with the  Annual  Report of  Monterey  Bay  Bancorp,  Inc.  (the
"Company")  on Form 10-K for the period  ending  December 31, 2002 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"),  I, C.
Edward Holden, Chief Executive Officer of the Company,  certify,  pursuant to 18
U.S.C.  Section 1350, as adopted  pursuant to Section 906 of the  Sarbanes-Oxley
Act of 2002, that:

     (1) The Report fully  complies  with the  requirements  of Section 13(a) or
         15(d) of the Securities Exchange Act of 1934; and

     (2) The  information  contained  in  the  Report  fairly  presents,  in all
         material respects, the financial condition and results of operations of
         the Company.


                                            Monterey Bay Bancorp, Inc.




Date:    March 27, 2003                     By:      /s/ C. Edward Holden
                                                     --------------------
                                                     C. Edward Holden
                                                     Chief Executive Officer