Exhibit 99.2

                    CERTIFICATION OF PERIODIC REPORT
                    --------------------------------

I, Mark F. Furlong, Chief Financial Officer of Marshall & Ilsley Corporation
(the "Company"), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of
2002, 18 U.S.C. Section 1350, that:

    (1)    the Quarterly Report on Form 10-Q of the Company for the quarterly
           period ended September 30, 2002 (the "Report") fully complies with
           the requirements of Section 13(a) or 15(d) of the Securities
           Exchange Act of 1934 (14 U.S.C. 78m or 78o(d)); and

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


Dated:  November 13, 2002


                                      /s/ Mark F. Furlong
                                      ______________________________________

                                      Mark F. Furlong
                                      Chief Financial Officer
                                      Marshall & Ilsley Corporation


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