CENTENNIAL MONEY MARKET TRUST
                      Supplement dated May 14, 1999 to the
                          Prospectus dated May 14, 1999


As of the date of this Prospectus, Class Y shares are not available.




May 14, 1999                                                  PS0150.005


<PAGE>


                          CENTENNIAL MONEY MARKET TRUST
                      Supplement dated May 14, 1999 to the
             Statement of Additional Information dated May 14, 1999


As of the date of this Statement of Additional  Information,  Class Y shares are
not available.




May 14, 1999                                                  PX0150.003



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