<DOCUMENT>
<TYPE>EX-13.(A)
<SEQUENCE>5
<FILENAME>e18330-ex13a.txt
<DESCRIPTION>ANNUAL CERTIFICATIONS
<TEXT>
                                                                   Exhibit 13(a)

                              Annual Certifications
            Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

      Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a)
and (b) of Section 1350,  Chapter 63 of Title 18,  United States Code),  each of
the  undersigned  officers of Grupo Simec,  S.A. de C.V. (the  "Company"),  does
hereby certify, to such officer's knowledge, that:

      The Annual Report on Form 20-F for the year ended December 31, 2003 of the
Company fully  complies with the  requirements  of Section 13(a) or 15(d) of the
Securities  Exchange  Act of 1934 and  information  contained  in the Form  20-F
fairly presents,  in all material respects,  the financial condition and results
of operations of the Company.

                                                             Dated: July 6, 2004


                                              /s/ Luis Garcia Limon
                                                  ---------------------
                                                  Luis Garcia Limon
                                                  Chief Executive Officer

                                              /s/ Adolfo Luna Luna
                                                  --------------------
                                                  Adolfo Luna Luna
                                                  Chief Financial Officer


</TEXT>
</DOCUMENT>
