<PAGE>
EXHIBIT 99.3

      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 Simon Worldwide, Inc. (the
"Company") on Form 10K for the period ending December 31, 2002, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
George G. Golleher, a member of the Executive Committee of the Board of
Directors which has responsibility for the role of principal 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, to the best of my
knowledge:

      (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.

                                        /s/ George G. Golleher
                                        ---------------------------
                                        George G. Golleher
                                        Executive Committee Member
                                        July 25, 2003

<PAGE>
EXHIBIT 99.3

      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 Simon Worldwide, Inc. (the
"Company") on Form 10K for the period ending December 31, 2002, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I, J.
Anthony Kouba, a member of the Executive Committee of the Board of Directors
which has responsibility for the role of principal 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, to the best of my
knowledge:

      (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.

                                        /s/ J. Anthony Kouba
                                        --------------------------
                                        J. Anthony Kouba
                                        Executive Committee Member
                                        July 25, 2003

<PAGE>
EXHIBIT 99.3

      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 Simon Worldwide, Inc. (the
"Company") on Form 10K for the period ending December 31, 2002, as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Greg Mays, principal financial 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, to the best of my knowledge:

      (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.

                                        /s/ Greg Mays

                                        ---------------------------
                                        Greg Mays
                                        Principal Financial Officer
                                        July 25, 2003