EXHIBIT 99.1 CERTIFICATION BY THE PRINCIPAL EXECUTIVE OFFICER OF SIGMATRON INTERNATIONAL, INC. PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. 1350) I, Gary R. Fairhead, am President and Chief Executive Officer of SigmaTron International, Inc. (the "Company"). This certification is being furnished pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in connection with the filing of the Company's Quarterly Report on Form 10-Q for the quarter ended January 31, 2003 (the "Report"). I hereby certify that to the best of my knowledge: (a) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78 m(a) or 78o(d); and (b) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Date: March 13, 2003 /s/ Gary R. Fairhead ----------------------------------------- Gary R. Fairhead President and Chief Executive Officer of SigmaTron International, Inc.