Morgan, Lewis & Bockius LLP
1111 Pennsylvania Avenue NW
Washington, DC 20004

April 24, 2008



VIA EDGAR

U.S. Securities and Exchange Commission
100 F Street, NE
Washington, DC 20549


Re:      RYDEX SERIES FUNDS (FILE NOS. 033-59692 AND 811-07584)
         ------------------------------------------------------


Ladies and Gentlemen:

On behalf of our  client,  Rydex  Series  Funds (the  "Trust"),  we are  filing,
pursuant to Rule 497(j) under the Securities Act of 1933, this letter certifying
that the forms of Prospectuses  and Statement of Additional  Information for the
Trust's  Managed  Futures  Strategy Fund that would have been filed  pursuant to
Rule  497(c)  would  not  have  differed  from  that  contained  in the  Trust's
Post-Effective  Amendment No. 75, which was filed with the U.S.  Securities  and
Exchange Commission via EDGAR accession number 0000935069-08-000948 on April 21,
2008.

Please  do not  hesitate  to  contact  me at  202.739.5654  should  you have any
questions.

Very truly yours,


/s/ W. John McGuire
- -------------------
W. John McGuire