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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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                                   FORM N-PX

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                    ANNUAL REPORT OF PROXY VOTING RECORD OF
                   REGISTERED MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number 811-02464

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                              MFS SERIES TRUST IX
               (Exact name of registrant as specified in charter)

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               111 Huntington Avenue, Boston, Massachusetts 02199
              (Address of principal executive offices) (Zip code)

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                                Susan S. Newton
                    Massachusetts Financial Services Company
                             111 Huntington Avenue
                          Boston, Massachusetts 02199
                    (Name and address of agents for service)

       Registrant's telephone number, including area code: (617) 954-5000

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               Date of fiscal year end: April 30 and October 31*

             Date of reporting period: July 1, 2012 - June 30, 2013

*    MFS Inflation-Adjusted Bond Fund, a series of the Registrant, has a fiscal
     year end of October 31. The fiscal year ends of the remaining series of the
     Registrant are April 30.

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ITEM 1.  PROXY VOTING RECORD.



******************************* FORM N-Px REPORT *******************************

ICA File Number: 811-02464
Reporting Period: 07/01/2012 - 06/30/2013
MFS Series Trust IX









================================ MFS Bond Fund =================================

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.



====================== MFS Inflation - Adjusted Bond Fund ======================

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.



========================== MFS Limited Maturity Fund ===========================

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.



===================== MFS Municipal Limited Maturity Fund ======================

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.



============================ MFS Research Bond Fund ============================

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.
========== END NPX REPORT



                                   SIGNATURES

Pursuant to the requirements of the Investment Company Act of 1940, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

Registrant: MFS SERIES TRUST IX

By (Signature and Title): JOHN M. CORCORAN*
                          ----------------------------------------
                          John M. Corcoran, Principal Executive
                          Officer & President

Date: August 16, 2013

*By (Signature and Title) /s/ Susan S. Newton
                          ----------------------------------------
                          Susan S. Newton, as attorney-in-fact

*    Executed by Susan S. Newton on behalf of John M. Corcoran pursuant to a
     Power of Attorney dated July 8th, 2013. (1)

(1)  Incorporated by reference to MFS Municipal Series Trust (File Nos. 2-92915
     and 811-4096) Post-Effective Amendment No. 56 filed with the SEC via EDGAR
     on July 26, 2013.