111 Huntington Avenue, Boston, Massachusetts  02199
(617) 954-5000

March 5, 2013



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

 
Re:
MFS ® Series Trust IX (the “Trust”) (File Nos. 2-50409 and 811-2464) on Behalf of MFS ® Inflation-Adjusted Bond Fund (the “Fund”)
 
 

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter on behalf of the Trust as certification that the Prospectus and Statement of Additional Information for the Trust do not differ from those contained in Post-Effective Amendment No. 82 (the “Amendment”) to the Trust’s Registration Statement on Form N-1A.  The Amendment was filed electronically on February 27, 2013.

Please call the undersigned at (617) 954-4340 or Nickolas Connery at (617) 954-6124 with any questions you may have.

Very truly yours,
 

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

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