MASSACHUSETTS FINANCIAL SERVICES COMPANY
              500 Boylston Street, Boston, Massachusetts 02116-3741
                                 617 - 954-5000




                                        June 4, 2007

VIA EDGAR
United States Securities & Exchange Commission
100 F Street, N.E.
Washington, DC  20549

     Re:  Request for  Withdrawal  of  Registration  Statement  on Form N-14 for
          MFS(R)    Series   Trust   IV   File   No.    333-142772;    Accession
          No.0001104659-07-037587

Ladies and Gentlemen:

     Pursuant to Rule 477 under the Securities Act of 1933, the MFS Series Trust
IV  ("Registrant"),  on behalf of MFS Money Market Fund,  respectfully  requests
that the Securities and Exchange  Commission (the  "Commission")  consent to the
withdrawal of the above  captioned Form N-14  Registration  Statement  (File No.
333-142772)  filed  with  the  Commission  at  16:37  PM on  May  9,  2007  (the
"Registration Statement").

     This  request  for  withdrawal  is being made  because the  Registrant  has
decided  not to acquire  the assets and  liabilities  of the target fund at this
time. No securities were sold in connection with the Registration Statement.

     Registrant  respectfully  submits  that a  withdrawal  of the  Registration
Statement is consistent with the public interest and the protection of investors
in light of the  circumstances  described  above.  Any questions  regarding this
matter may be directed to Claudia Murphy at  617-954-5406  or the undersigned at
617-954-4340.

                                        Sincerely,



                                        SUSAN A. PEREIRA
                                        Susan A. Pereira
                                        Vice President & Senior Counsel