UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM N-PX

                     ANNUAL REPORT OF PROXY VOTING RECORD OF
                   REGISTERED MANAGEMENT INVESTMENT COMPANIES

                   Investment Company Act file number 811-2464

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                               MFS SERIES TRUST IX

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               (Exact name of registrant as specified in charter)

                500 Boylston Street, Boston, Massachusetts 02116

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               (Address of principal executive offices) (Zip code)

                                 Susan S. Newton
                    Massachusetts Financial Services Company
                               500 Boylston Street
                           Boston, Massachusetts 02116

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                    (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*

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            Date of reporting period: July 1, 2004 - June 30, 2005**

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

**The reporting period for MFS Emerging Opportunities Fund, which terminated on
February 1, 2005, is July 1, 2004 - February 1, 2005.



ITEM 1. PROXY VOTING RECORD

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

ICA File Number: 811-02464
Reporting Period: 07/01/2004 - 06/30/2005
MFS Series Trust IX









================================ MFS BOND FUND =================================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


======================= MFS EMERGING OPPORTUNITIES FUND ========================


AMADEUS FIRE AG (FRMLY AMADEUS AG PERSONAL DIENSTLEISTER UND SOLUTION PROVIDER)

Ticker:                      Security ID:  D0349N105
Meeting Date: AUG 4, 2004    Meeting Type: Annual
Record Date:

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Receive Financial Statements and          None      Did Not    Management
      Statutory Reports                                   Vote
2     Approve Allocation of Income and Omission For       Did Not    Management
      of Dividends                                        Vote
3     Approve Discharge of Management Board     For       Did Not    Management
                                                          Vote
4     Approve Discharge of Supervisory Board    For       Did Not    Management
                                                          Vote
5     Change Fiscal Year End to Coincide with   For       Did Not    Management
      the Calendar Year                                   Vote
6     Ratify Ernst & Young Revisions- und       For       Did Not    Management
      Treuhandgeselschaft mbH as Auditors                 Vote
7     Authorize Share Repurchase Program and    For       Did Not    Management
      Reissuance of Repurchased Shares                    Vote
8     Approve Creation of EUR 1.5 Million Pool  For       Did Not    Management
      of Conditional Capital without Preemptive           Vote
      Rights


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AMDOCS LIMITED

Ticker:       DOX            Security ID:  G02602103
Meeting Date: JAN 20, 2005   Meeting Type: Annual
Record Date:  NOV 24, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Bruce K. Anderson         For       For        Management
1.2   Elect  Director Adrian Gardner            For       For        Management
1.3   Elect  Director Dov Baharav               For       For        Management
1.4   Elect  Director Julian A. Brodsky         For       For        Management
1.5   Elect  Director Charles E. Foster         For       For        Management
1.6   Elect  Director Eli Gelman                For       For        Management
1.7   Elect  Director James S. Kahan            For       For        Management
1.8   Elect  Director Nehemia Lemelbaum         For       For        Management
1.9   Elect  Director John T. Mclennan          For       For        Management
1.10  Elect  Director Robert A. Minicucci       For       For        Management
1.11  Elect  Director Simon Olswang             For       For        Management
1.12  Elect  Director Mario Segal               For       For        Management
2     APPROVAL OF CONSOLIDATED FINANCIAL        For       For        Management
      STATEMENTS FOR FISCAL YEAR 2004.
3     RATIFICATION AND APPROVAL OF ERNST &      For       For        Management
      YOUNG LLP AND AUTHORIZATION OF AUDIT
      COMMITTEE OF BOARD TO FIX REMUNERATION.


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AMERICAN SUPERCONDUCTOR CORP.

Ticker:       AMSC           Security ID:  030111108
Meeting Date: JUL 29, 2004   Meeting Type: Annual
Record Date:  JUN 9, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Gregory J. Yurek          For       For        Management
1.2   Elect  Director Albert J. Baciocco, Jr.   For       For        Management
1.3   Elect  Director Vikram S. Budhraja        For       For        Management
1.4   Elect  Director Peter O. Crisp            For       For        Management
1.5   Elect  Director Richard Drouin            For       For        Management
1.6   Elect  Director Andrew G.C. Sage, Ii      For       For        Management
1.7   Elect  Director John B. Vander Sande      For       For        Management
2     Increase Authorized Common Stock          For       For        Management
3     Approve Omnibus Stock Plan                For       Against    Management
4     Amend Non-Employee Director Stock Option  For       For        Management
      Plan
5     Ratify Auditors                           For       For        Management


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AMERITRADE HOLDINGS CORP.

Ticker:       AMTD           Security ID:  03074K100
Meeting Date: FEB 16, 2005   Meeting Type: Annual
Record Date:  DEC 20, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect Director J. Joe  Ricketts           For       For        Management
1.2   Elect Director Dan W. Cook III            For       For        Management
2     Ratify Auditors                           For       For        Management
3     Other Business                            For       For        Management


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ELECTRONIC ARTS INC.

Ticker:       ERTS           Security ID:  285512109
Meeting Date: JUL 29, 2004   Meeting Type: Annual
Record Date:  JUN 8, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director M. Richard Asher          For       For        Management
1.2   Elect  Director William J. Byron          For       For        Management
1.3   Elect  Director Leonard S. Coleman        For       For        Management
1.4   Elect  Director Gary M. Kusin             For       For        Management
1.5   Elect  Director Gregory B. Maffei         For       For        Management
1.6   Elect  Director Timothy Mott              For       For        Management
1.7   Elect  Director Robert W. Pittman         For       For        Management
1.8   Elect  Director Lawrence F. Probst III    For       For        Management
1.9   Elect  Director Linda J. Srere            For       For        Management
2     Amend Omnibus Stock Plan                  For       Against    Management
3     Amend Employee Stock Purchase Plan        For       For        Management
4     Amend Articles to Consolidate Common      For       For        Management
      Stock
5     Increase Authorized Common Stock          For       Against    Management
6     Ratify Auditors                           For       For        Management


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ENCORE WIRE CORP.

Ticker:       WIRE           Security ID:  292562105
Meeting Date: JUL 20, 2004   Meeting Type: Special
Record Date:  JUN 2, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Increase Authorized Common Stock          For       For        Management


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EVCI CAREER COLLEGES HOLDINGS INC

Ticker:       EVCI           Security ID:  26926P100
Meeting Date: JUL 27, 2004   Meeting Type: Annual
Record Date:  JUN 7, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Dr. John J. McGrath       For       For        Management
1.2   Elect  Director Royce N. Flippin, Jr.     For       For        Management
2     Change Company Name                       For       For        Management
3     Approve Omnibus Stock Plan                For       Against    Management
4     Approve Stock Option Grants for Executive For       For        Management
      Officers
5     Ratify Auditors                           For       For        Management


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FISHER SCIENTIFIC INTERNATIONAL INC.

Ticker:       FSH            Security ID:  338032204
Meeting Date: AUG 2, 2004    Meeting Type: Annual
Record Date:  MAY 14, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Issue Shares in Connection with an        For       For        Management
      Acquisition
2.1   Elect  Director Michael D. Dingman        For       For        Management
2.2   Elect  Director Charles A. Sanders M.D.   For       For        Management
3     Ratify Auditors                           For       For        Management
4     Adjourn Meeting                           For       For        Management


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GSI COMMERCE INC

Ticker:       GSIC           Security ID:  36238G102
Meeting Date: JUL 29, 2004   Meeting Type: Annual
Record Date:  JUN 9, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Michael G. Rubin          For       For        Management
1.2   Elect  Director Kenneth J. Adelberg       For       For        Management
1.3   Elect  Director M. Jeffrey Branman        For       For        Management
1.4   Elect  Director Ronald D. Fisher          For       For        Management
1.5   Elect  Director Harvey Lamm               For       For        Management
1.6   Elect  Director Mark S. Menell            For       For        Management
1.7   Elect  Director Michael S. Perlis         For       For        Management
1.8   Elect  Director Jeffrey F. Rayport        For       For        Management
2     Amend Omnibus Stock Plan                  For       Against    Management


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HARRIS INTERACTIVE INC.

Ticker:       HPOL           Security ID:  414549105
Meeting Date: NOV 9, 2004    Meeting Type: Annual
Record Date:  SEP 20, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Robert E. Knapp           For       For        Management
1.2   Elect  Director Howard L. Shecter         For       For        Management
1.3   Elect  Director Subrata K. Sen            For       For        Management
1.4   Elect  Director Antoine G. Treuille       For       For        Management
2     Amend Omnibus Stock Plan                  For       Against    Management
3     Amend Employee Stock Purchase Plan        For       For        Management


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INTEGRATED CIRCUIT SYSTEMS, INC.

Ticker:       ICST           Security ID:  45811K208
Meeting Date: OCT 28, 2004   Meeting Type: Annual
Record Date:  SEP 9, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Lewis C. Eggebrecht       For       For        Management
1.2   Elect  Director Henry I. Boreen           For       For        Management
1.3   Elect  Director David Dominik             For       For        Management


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MEDICIS PHARMACEUTICAL CORP.

Ticker:       MRX            Security ID:  584690309
Meeting Date: NOV 17, 2004   Meeting Type: Annual
Record Date:  OCT 8, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect Director Jonah Shacknai             For       For        Management
1.2   Elect Director Michael A. Pietrangelo     For       For        Management
1.3   Elect Director Lottie H. Shackelford      For       For        Management
2     Approve Stock Option Plan                 For       Against    Management
3     Ratify Auditors                           For       For        Management


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MEREDITH CORP.

Ticker:       MDP            Security ID:  589433101
Meeting Date: NOV 8, 2004    Meeting Type: Annual
Record Date:  SEP 9, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Mary Sue Coleman          For       For        Management
1.2   Elect  Director D Mell Meredith Frazier   For       For        Management
1.3   Elect  Director Joel W. Johnson           For       For        Management
1.4   Elect  Director Stephen M. Lacy           For       For        Management
2     Approve Omnibus Stock Plan                For       Against    Management


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PETMED EXPRESS, INC.

Ticker:       PETS           Security ID:  716382106
Meeting Date: AUG 6, 2004    Meeting Type: Annual
Record Date:  JUN 22, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1.1   Elect  Director Menderes Akdag            For       For        Management
1.2   Elect  Director Frank J. Formica          For       For        Management
1.3   Elect  Director Gian Fulgoni              For       For        Management
1.4   Elect  Director Ronald J. Korn            For       For        Management
1.5   Elect  Director Marc A. Puleo, M.D.       For       For        Management
1.6   Elect  Director Robert C. Schweitzer      For       For        Management
2     Ratify Auditors                           For       For        Management


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PHS GROUP PLC

Ticker:                      Security ID:  G70712107
Meeting Date: JUL 23, 2004   Meeting Type: Annual
Record Date:

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Accept Financial Statements and Statutory For       For        Management
      Reports
2     Approve Remuneration Report               For       For        Management
3     Approve Final Dividend of 1.48 Pence Per  For       For        Management
      Ordinary Share
4     Re-elect Robert Mackenzie as Director     For       For        Management
5     Re-elect John Allan as Director           For       For        Management
6     Re-appoint PricewaterhouseCoopers LLP as  For       For        Management
      Auditors and Authorise Board to Fix
      Remuneration of Auditors
7     Authorise Issuance of Equity or           For       For        Management
      Equity-Linked Securities with Pre-emptive
      Rights up to Aggregate Nominal Amount of
      GBP 17,062,950
8     Authorise Issuance of Equity or           For       For        Management
      Equity-Linked Securities without
      Pre-emptive Rights up to Aggregate
      Nominal Amount of GBP 2,585,295
9     Authorise 51,705,908 Ordinary Shares for  For       For        Management
      Market Purchase


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SKILLSOFT PLC [FORMERLY SMARTFORCE PLC (FRM.CBT GROUP PLC)]

Ticker:       SKIL           Security ID:  830928107
Meeting Date: AUG 27, 2004   Meeting Type: Annual
Record Date:  JUL 16, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     TO RECEIVE AND CONSIDER THE CONSOLIDATED  For       For        Management
      FINANCIAL STATEMENTS OF THE COMPANY FOR
      THE FISCAL YEAR ENDED JANUARY 31, 2004
      AND THE REPORT OF THE DIRECTORS AND
      AUDITOR THEREON.
2     TO RE-ELECT AS DIRECTOR MR. JAMES         For       For        Management
      KRZYWICKI WHO RETIRES BY ROTATION AND,
      BEING ELIGIBLE, OFFERS HIMSELF FOR
      RE-ELECTION.
3     TO RE-ELECT AS DIRECTOR DR FERDINAND VON  For       For        Management
      PRONDZYNSKI WHO RETIRES BY ROTATION AND,
      BEING ELIGIBLE, OFFERS HIMSELF FOR
      RE-ELECTION.
4     TO ELECT AS A DIRECTOR MR. WILLIAM F.     For       For        Management
      MEAGHER, JR., WHO WAS APPOINTED AS A
      DIRECTOR IN MARCH 2004.
5     TO AUTHORIZE THE AUDIT COMMITTEE OF THE   For       For        Management
      BOARD OF DIRECTORS TO FIX THE
      REMUNERATION OF THE COMPANY S AUDITOR AND
      ACCOUNTANTS.
6     THAT THE COMPANY S 2004 EMPLOYEE SHARE    For       For        Management
      PURCHASE PLAN (THE  2004 ESPP ) BE AND IT
      IS HEREBY ADOPTED.
7     THAT, SUBJECT TO COMPLIANCE WITH ALL      For       For        Management
      APPLICABLE LAWS, THE TERMS OF A SHARE
      REPURCHASE AGREEMENT PROPOSED TO BE
      ENTERED INTO BETWEEN THE COMPANY AND
      CREDIT SUISSE FIRST BOSTON LLC BE AND THE
      SAME HEREBY ARE APPROVED AND AUTHORIZED.


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SKILLSOFT PLC [FORMERLY SMARTFORCE PLC (FRM.CBT GROUP PLC)]

Ticker:       SKIL           Security ID:  830928107
Meeting Date: SEP 24, 2004   Meeting Type: Special
Record Date:  AUG 30, 2004

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     TO APPROVE THE TERMS OF A SHARE PURCHASE  For       For        Management
      AGREEMENT TO BE ENTERED INTO AMONG
      SKILLSOFT PUBLIC LIMITED COMPANY, CBT
      (TECHNOLOGY) LIMITED, A SUBSIDIARY OF THE
      COMPANY, CBT FINANCE LIMITED, A
      SUBSIDIARY OF THE COMPANY, AND CREDIT
      SUISSE FIRST BOSTON LLC.


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VASOGEN INC.

Ticker:       VAS.           Security ID:  92232F103
Meeting Date: MAR 16, 2005   Meeting Type: Annual/Special
Record Date:  JAN 17, 2005

#     Proposal                                  Mgt Rec   Vote Cast  Sponsor
1     Elect William Grant, Andre Berard, David  For       For        Management
      Elsley, Terrance Gregg, Benoit La Salle,
      Surya Mohapatra, Eldon Smith, John
      Villforth as Directors
2     Approve KPMG LLP as Auditors and          For       For        Management
      Authorize Board to Fix Remuneration of
      Auditors
3     Amend 2003 Employee Stock Option Plan     For       For        Management




====================== MFS INFLATION - ADJUSTED BOND FUND ======================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


================= MFS INTERMEDIATE INVESTMENT GRADE BOND FUND ==================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


========================== MFS LIMITED MATURITY FUND ===========================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


===================== MFS MUNICIPAL LIMITED MATURITY FUND ======================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


============================ MFS RESEARCH BOND FUND ============================


NO VOTING RECORDS FOR THIS REPORTING PERIOD


=========================== MFS RESEARCH BOND FUND J ===========================


NO VOTING RECORDS FOR THIS 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)   ROBERT J. MANNING*
                           --------------------------------------------
                           Robert J. Manning, Principal Executive Officer

Date:  August 26, 2005
       ---------------

*By (Signature and Title)  SUSAN S. NEWTON
                           ----------------------------------------------
                           Susan S. Newton, as Attorney-in-Fact

*Executed by Susan S. Newton on behalf of Robert J. Manning pursuant to a Power
of Attorney dated July 29, 2005. (1)

(1) Incorporated by reference to MFS Municipal Series Trust (File Nos. 2-92915
and 811-4096) Post Effective Amendment No. 40 filed with the SEC via EDGAR on
July 29, 2005.