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                                 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 811-21780

                                ---------------

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

                                ---------------

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

                                ---------------

                                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

                                ---------------

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

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

*    The MFS Equity Opportunities Fund has a fiscal year end of October 31. The
     fiscal year ends of the remaining series of the Registrant are April 30.

**   The reporting period for MFS 2015 Lifetime Fund, MFS 2025 Lifetime Fund,
     MFS Lifetime 2035 Fund, MFS Lifetime 2045 Fund, and MFS Lifetime 2055 Fund,
     each series of the Registrant, commenced on November 2, 2012, the date that
     each of the aforementioned series of the Registrant commenced investment
     operations.

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ITEM 1.  PROXY VOTING RECORD.



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

ICA File Number: 811-21780
Reporting Period: 07/01/2012 - 06/30/2013
MFS Series Trust XII









======================== MFS Equity Opportunities Fund =========================


AETNA INC.

Ticker:       AET            Security ID:  00817Y108
Meeting Date: MAY 17, 2013   Meeting Type: Annual
Record Date:  MAR 15, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Fernando Aguirre         For       For          Management
1b    Elect Director Mark T. Bertolini        For       For          Management
1c    Elect Director Frank M. Clark           For       For          Management
1d    Elect Director Betsy Z. Cohen           For       For          Management
1e    Elect Director Molly J. Coye            For       For          Management
1f    Elect Director Roger N. Farah           For       For          Management
1g    Elect Director Barbara Hackman Franklin For       For          Management
1h    Elect Director Jeffrey E. Garten        For       For          Management
1i    Elect Director Ellen M. Hancock         For       For          Management
1j    Elect Director Richard J. Harrington    For       For          Management
1k    Elect Director Edward J. Ludwig         For       For          Management
1l    Elect Director Joseph P. Newhouse       For       For          Management
2     Ratify Auditors                         For       For          Management
3     Amend Omnibus Stock Plan                For       For          Management
4     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
5     Require Independent Board Chairman      Against   Against      Shareholder
6     Reduce Supermajority Vote Requirement   Against   For          Shareholder
7     Enhance Board Oversight of Political    Against   Against      Shareholder
      Contributions


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ALLISON TRANSMISSION HOLDINGS, INC.

Ticker:       ALSN           Security ID:  01973R101
Meeting Date: MAY 08, 2013   Meeting Type: Annual
Record Date:  MAR 11, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director David F. Denison         For       For          Management
1.2   Elect Director Gregory S. Ledford       For       For          Management
1.3   Elect Director Seth M. Mersky           For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Advisory Vote on Say on Pay Frequency   Three     One Year     Management
                                              Years
4     Ratify Auditors                         For       For          Management


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APPLE INC.

Ticker:       AAPL           Security ID:  037833100
Meeting Date: FEB 27, 2013   Meeting Type: Annual
Record Date:  JAN 02, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director William Campbell         For       For          Management
1.2   Elect Director Timothy Cook             For       For          Management
1.3   Elect Director Millard Drexler          For       For          Management
1.4   Elect Director Al Gore                  For       For          Management
1.5   Elect Director Robert Iger              For       For          Management
1.6   Elect Director Andrea Jung              For       For          Management
1.7   Elect Director Arthur Levinson          For       For          Management
1.8   Elect Director Ronald Sugar             For       For          Management
2     Amend Articles of Incorporation         For       For          Management
3     Ratify Auditors                         For       For          Management
4     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
5     Stock Retention/Holding Period          Against   Against      Shareholder
6     Establish Board Committee on Human      Against   Against      Shareholder
      Rights


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CAPITALSOURCE INC.

Ticker:       CSE            Security ID:  14055X102
Meeting Date: APR 25, 2013   Meeting Type: Annual
Record Date:  MAR 05, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Andrew B. Fremder        For       For          Management
1.2   Elect Director C. William Hosler        For       For          Management
1.3   Elect Director James J. Pieczynski      For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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CELGENE CORPORATION

Ticker:       CELG           Security ID:  151020104
Meeting Date: JUN 12, 2013   Meeting Type: Annual
Record Date:  APR 17, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Robert J. Hugin          For       Withhold     Management
1.2   Elect Director Richard Barker           For       Withhold     Management
1.3   Elect Director Michael D. Casey         For       Withhold     Management
1.4   Elect Director Carrie S. Cox            For       Withhold     Management
1.5   Elect Director Rodman L. Drake          For       Withhold     Management
1.6   Elect Director Michael A. Friedman      For       Withhold     Management
1.7   Elect Director Gilla Kaplan             For       Withhold     Management
1.8   Elect Director James J. Loughlin        For       Withhold     Management
1.9   Elect Director Ernest Mario             For       Withhold     Management
2     Ratify Auditors                         For       For          Management
3     Amend Omnibus Stock Plan                For       For          Management
4     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
5     Stock Retention/Holding Period          Against   Against      Shareholder


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CHEVRON CORPORATION

Ticker:       CVX            Security ID:  166764100
Meeting Date: MAY 29, 2013   Meeting Type: Annual
Record Date:  APR 03, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Linnet F. Deily          For       For          Management
1b    Elect Director Robert E. Denham         For       For          Management
1c    Elect Director Alice P. Gast            For       For          Management
1d    Elect Director Enrique Hernandez, Jr.   For       For          Management
1e    Elect Director George L. Kirkland       For       For          Management
1f    Elect Director Charles W. Moorman, IV   For       For          Management
1g    Elect Director Kevin W. Sharer          For       For          Management
1h    Elect Director John G. Stumpf           For       For          Management
1i    Elect Director Ronald D. Sugar          For       For          Management
1j    Elect Director Carl Ware                For       For          Management
1k    Elect Director John S. Watson           For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Amend Omnibus Stock Plan                For       Against      Management
5     Report on Management of Hydraulic       Against   For          Shareholder
      Fracturing Risks and Opportunities
6     Report on Offshore Oil Wells and Spill  Against   Against      Shareholder
      Mitigation Measures
7     Report on Financial Risks of Climate    Against   Against      Shareholder
      Change
8     Report on Lobbying Payments and Policy  Against   For          Shareholder
9     Prohibit Political Contributions        Against   Against      Shareholder
10    Provide for Cumulative Voting           Against   Against      Shareholder
11    Amend Articles/Bylaws/Charter -- Call   Against   For          Shareholder
      Special Meetings
12    Require Director Nominee with           Against   Against      Shareholder
      Environmental Expertise
13    Adopt Guidelines for Country Selection  Against   Against      Shareholder


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COCA-COLA ENTERPRISES, INC.

Ticker:       CCE            Security ID:  19122T109
Meeting Date: APR 23, 2013   Meeting Type: Annual
Record Date:  FEB 25, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Jan Bennink              For       For          Management
1.2   Elect Director John F. Brock            For       For          Management
1.3   Elect Director Calvin Darden            For       For          Management
1.4   Elect Director L. Phillip Humann        For       For          Management
1.5   Elect Director Orrin H. Ingram, II      For       For          Management
1.6   Elect Director Thomas H. Johnson        For       For          Management
1.7   Elect Director Suzanne B. Labarge       For       For          Management
1.8   Elect Director Veronique Morali         For       For          Management
1.9   Elect Director Andrea L. Saia           For       For          Management
1.10  Elect Director Garry Watts              For       For          Management
1.11  Elect Director Curtis R. Welling        For       For          Management
1.12  Elect Director Phoebe A. Wood           For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management


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CVS CAREMARK CORPORATION

Ticker:       CVS            Security ID:  126650100
Meeting Date: MAY 09, 2013   Meeting Type: Annual
Record Date:  MAR 13, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director C. David Brown II        For       For          Management
1.2   Elect Director David W. Dorman          For       For          Management
1.3   Elect Director Anne M. Finucane         For       For          Management
1.4   Elect Director Kristen Gibney Williams  For       For          Management
1.5   Elect Director Larry J. Merlo           For       For          Management
1.6   Elect Director Jean-Pierre Millon       For       For          Management
1.7   Elect Director Richard J. Swift         For       For          Management
1.8   Elect Director William C. Weldon        For       For          Management
1.9   Elect Director Tony L. White            For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Amend Qualified Employee Stock          For       For          Management
      Purchase Plan
5     Reduce Vote Requirement Under the Fair  For       For          Management
      Price Provision
6     Report on Political Contributions       Against   For          Shareholder
7     Pro-rata Vesting of Equity Awards       Against   For          Shareholder
8     Report on Lobbying Payments and Policy  Against   For          Shareholder


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DELPHI AUTOMOTIVE PLC

Ticker:       DLPH           Security ID:  G27823106
Meeting Date: APR 25, 2013   Meeting Type: Annual
Record Date:  FEB 26, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Reelect Gary L. Cowger as a Director    For       For          Management
1.2   Reelect Nicholas M. Donofrio as a       For       For          Management
      Director
1.3   Reelect Mark P. Frissora as a Director  For       For          Management
1.4   Reelect Rajiv L. Gupta as a Director    For       For          Management
1.5   Reelect John A. Krol as a Director      For       For          Management
1.6   Reelect J. Randall MacDonald as a       For       For          Management
      Director
1.7   Reelect Sean O. Mahoney as a Director   For       For          Management
1.8   Reelect Rodney O'Neal as a Director     For       For          Management
1.9   Reelect Thomas W. Sidlik as a Director  For       For          Management
1.10  Reelect Bernd Wiedemann as a Director   For       For          Management
1.11  Reelect Lawrence A. Zimmerman as a      For       For          Management
      Director
2     Ratify Ernst & Young LLP as Auditors    For       For          Management
      and Authorize Board to Fix Their
      Remuneration
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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DISCOVER FINANCIAL SERVICES

Ticker:       DFS            Security ID:  254709108
Meeting Date: APR 17, 2013   Meeting Type: Annual
Record Date:  FEB 19, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Jeffrey S. Aronin        For       For          Management
1.2   Elect Director Mary K. Bush             For       For          Management
1.3   Elect Director Gregory C. Case          For       For          Management
1.4   Elect Director Cynthia A. Glassman      For       For          Management
1.5   Elect Director Richard H. Lenny         For       For          Management
1.6   Elect Director Thomas G. Maheras        For       For          Management
1.7   Elect Director Michael H. Moskow        For       For          Management
1.8   Elect Director David W. Nelms           For       For          Management
1.9   Elect Director E. Follin Smith          For       For          Management
1.10  Elect Director Mark A. Thierer          For       For          Management
1.11  Elect Director Lawrence A. Weinbach     For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management


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EDISON INTERNATIONAL

Ticker:       EIX            Security ID:  281020107
Meeting Date: APR 25, 2013   Meeting Type: Annual
Record Date:  MAR 01, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Jagjeet S. Bindra        For       For          Management
1.2   Elect Director Vanessa C.L. Chang       For       For          Management
1.3   Elect Director France A. Cordova        For       For          Management
1.4   Elect Director Theodore F. Craver, Jr.  For       For          Management
1.5   Elect Director Bradford M. Freeman      For       For          Management
1.6   Elect Director Luis G. Nogales          For       For          Management
1.7   Elect Director Ronald L. Olson          For       For          Management
1.8   Elect Director Richard T. Schlosberg,   For       For          Management
      III
1.9   Elect Director Thomas C. Sutton         For       For          Management
1.10  Elect Director Peter J. Taylor          For       For          Management
1.11  Elect Director Brett White              For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Require Independent Board Chairman      Against   Against      Shareholder


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ENERGY XXI (BERMUDA) LIMITED

Ticker:       5E3B           Security ID:  G10082140
Meeting Date: NOV 06, 2012   Meeting Type: Annual
Record Date:  SEP 17, 2012

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Paul Davison as Director          For       For          Management
1.2   Elect Hill Feinberg as Director         For       For          Management
2     Approve UHY LLP as Auditors and         For       For          Management
      Authorize Board to Fix Their
      Remuneration


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EVEREST RE GROUP, LTD.

Ticker:       RE             Security ID:  G3223R108
Meeting Date: MAY 15, 2013   Meeting Type: Annual
Record Date:  MAR 20, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Dominic J. Addesso       For       For          Management
1.2   Elect Director John J. Amore            For       Withhold     Management
1.3   Elect Director John R. Dunne            For       Withhold     Management
1.4   Elect Director Joseph V. Taranto        For       Withhold     Management
1.5   Elect Director John A. Weber            For       Withhold     Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
3     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation


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EXPRESS, INC.

Ticker:       EXPR           Security ID:  30219E103
Meeting Date: JUN 06, 2013   Meeting Type: Annual
Record Date:  APR 08, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Sona Chawla              For       For          Management
1.2   Elect Director Theo Killion             For       For          Management
1.3   Elect Director Michael Weiss            For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Advisory Vote on Say on Pay Frequency   One Year  One Year     Management
4     Adopt Majority Voting for Uncontested   For       For          Management
      Election of Directors
5     Ratify Auditors                         For       For          Management


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FLEETCOR TECHNOLOGIES, INC.

Ticker:       FLT            Security ID:  339041105
Meeting Date: MAY 30, 2013   Meeting Type: Annual
Record Date:  APR 12, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Ronald F. Clarke         For       For          Management
1.2   Elect Director Richard Macchia          For       For          Management
2     Ratify Auditors                         For       For          Management
3     Amend Omnibus Stock Plan                For       For          Management


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FRONTIER COMMUNICATIONS CORPORATION

Ticker:       FTR            Security ID:  35906A108
Meeting Date: MAY 08, 2013   Meeting Type: Annual
Record Date:  MAR 12, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Leroy T. Barnes, Jr.     For       For          Management
1.2   Elect Director Peter C.B. Bynoe         For       For          Management
1.3   Elect Director Jeri B. Finard           For       For          Management
1.4   Elect Director Edward Fraioli           For       For          Management
1.5   Elect Director James S. Kahan           For       For          Management
1.6   Elect Director Pamela D.A. Reeve        For       For          Management
1.7   Elect Director Howard L. Schrott        For       For          Management
1.8   Elect Director Larraine D. Segil        For       For          Management
1.9   Elect Director Mark Shapiro             For       For          Management
1.10  Elect Director Myron A. Wick, III       For       For          Management
1.11  Elect Director Mary Agnes Wilderotter   For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Approve Executive Incentive Bonus Plan  For       For          Management
4     Approve Omnibus Stock Plan              For       For          Management
5     Require Independent Board Chairman      Against   Against      Shareholder
6     Ratify Auditors                         For       For          Management


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GENERAL MOTORS COMPANY

Ticker:       GM             Security ID:  37045V100
Meeting Date: JUN 06, 2013   Meeting Type: Annual
Record Date:  APR 08, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Daniel F. Akerson        For       For          Management
1b    Elect Director David Bonderman          For       Against      Management
1c    Elect Director Erroll B. Davis, Jr.     For       For          Management
1d    Elect Director Stephen J. Girsky        For       For          Management
1e    Elect Director E. Neville Isdell        For       For          Management
1f    Elect Director Robert D. Krebs          For       For          Management
1g    Elect Director Kathryn V. Marinello     For       For          Management
1h    Elect Director Michael G. Mullen        For       For          Management
1i    Elect Director James J. Mulva           For       For          Management
1j    Elect Director Patricia F. Russo        For       For          Management
1k    Elect Director Thomas M. Schoewe        For       For          Management
1l    Elect Director Theodore M. Solso        For       For          Management
1m    Elect Director Carol M. Stephenson      For       For          Management
1n    Elect Director Cynthia A. Telles        For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Require Independent Board Chairman      Against   Against      Shareholder
5     Stock Retention/Holding Period          Against   Against      Shareholder


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GRAND CANYON EDUCATION, INC.

Ticker:       LOPE           Security ID:  38526M106
Meeting Date: MAY 16, 2013   Meeting Type: Annual
Record Date:  MAR 26, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Brent D. Richardson      For       For          Management
1.2   Elect Director Brian E. Mueller         For       For          Management
1.3   Elect Director David J. Johnson         For       For          Management
1.4   Elect Director Jack A. Henry            For       For          Management
1.5   Elect Director Bradley A. Casper        For       For          Management
1.6   Elect Director Kevin F. Warren          For       For          Management
1.7   Elect Director Sara R. Dial             For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management


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HANESBRANDS INC.

Ticker:       HBI            Security ID:  410345102
Meeting Date: APR 03, 2013   Meeting Type: Annual
Record Date:  FEB 08, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Lee A. Chaden            For       For          Management
1.2   Elect Director Bobby J. Griffin         For       For          Management
1.3   Elect Director James C. Johnson         For       For          Management
1.4   Elect Director Jessica T. Mathews       For       For          Management
1.5   Elect Director  J. Patrick Mulcahy      For       For          Management
1.6   Elect Director Ronald L. Nelson         For       For          Management
1.7   Elect Director Richard A. Noll          For       For          Management
1.8   Elect Director Andrew J. Schindler      For       For          Management
1.9   Elect Director Ann E. Ziegler           For       For          Management
2     Amend Omnibus Stock Plan                For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Ratify Auditors                         For       For          Management


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HCA HOLDINGS, INC.

Ticker:       HCA            Security ID:  40412C101
Meeting Date: APR 24, 2013   Meeting Type: Annual
Record Date:  MAR 01, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Richard M. Bracken       For       Withhold     Management
1.2   Elect Director  R. Milton Johnson       For       Withhold     Management
1.3   Elect Director John P. Connaughton      For       Withhold     Management
1.4   Elect Director  Kenneth W. Freeman      For       Withhold     Management
1.5   Elect Director Thomas F. Frist, III     For       Withhold     Management
1.6   Elect Director William R. Frist         For       Withhold     Management
1.7   Elect Director Christopher R. Gordon    For       Withhold     Management
1.8   Elect Director Jay O. Light             For       For          Management
1.9   Elect Director Geoffrey G. Meyers       For       For          Management
1.10  Elect Director Michael W. Michelson     For       Withhold     Management
1.11  Elect Director James C. Momtazee        For       Withhold     Management
1.12  Elect Director Stephen G. Pagliuca      For       Withhold     Management
1.13  Elect Director  Wayne J. Riley          For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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JPMORGAN CHASE & CO.

Ticker:       JPM            Security ID:  46625H100
Meeting Date: MAY 21, 2013   Meeting Type: Annual
Record Date:  MAR 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director James A. Bell            For       For          Management
1b    Elect Director Crandall C.Bowles        For       For          Management
1c    Elect Director Stephen B. Burke         For       For          Management
1d    Elect Director David M. Cote            For       For          Management
1e    Elect Director James S. Crown           For       For          Management
1f    Elect Director James Dimon              For       For          Management
1g    Elect Director Timothy P. Flynn         For       For          Management
1h    Elect Director Ellen V. Futter          For       Against      Management
1i    Elect Director Laban P. Jackson, Jr.    For       For          Management
1j    Elect Director Lee R. Raymond           For       For          Management
1k    Elect Director William C. Weldon        For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Provide Right to Act by Written Consent For       For          Management
5     Amend Executive Incentive Bonus Plan    For       For          Management
6     Require Independent Board Chairman      Against   Against      Shareholder
7     Stock Retention/Holding Period          Against   Against      Shareholder
8     Institute Procedures to Prevent         Against   Against      Shareholder
      Investments in Companies that
      Contribute to Genocide or Crimes
      Against Humanity
9     Report on Lobbying Payments and Policy  Against   Against      Shareholder


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LORILLARD, INC.

Ticker:       LO             Security ID:  544147101
Meeting Date: MAY 14, 2013   Meeting Type: Annual
Record Date:  MAR 25, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Declassify the Board of Directors       For       For          Management
2.1   Elect Director Andrew H. Card, Jr.      For       For          Management
2.2   Elect Director Virgis W. Colbert        For       For          Management
2.3   Elect Director Richard W. Roedel        For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Ratify Auditors                         For       For          Management
5     Report on Lobbying Payments and Policy  Against   For          Shareholder


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MACY'S, INC.

Ticker:       M              Security ID:  55616P104
Meeting Date: MAY 17, 2013   Meeting Type: Annual
Record Date:  MAR 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Stephen F. Bollenbach    For       For          Management
1b    Elect Director Deirdre P. Connelly      For       For          Management
1c    Elect Director Meyer Feldberg           For       For          Management
1d    Elect Director Sara Levinson            For       For          Management
1e    Elect Director Terry J. Lundgren        For       For          Management
1f    Elect Director Joseph Neubauer          For       For          Management
1g    Elect Director Joyce M. Roche           For       For          Management
1h    Elect Director Paul C. Varga            For       For          Management
1i    Elect Director Craig E. Weatherup       For       For          Management
1j    Elect Director Marna C. Whittington     For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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MCGRAW HILL FINANCIAL INC.

Ticker:       MHP            Security ID:  580645109
Meeting Date: MAY 01, 2013   Meeting Type: Annual
Record Date:  MAR 11, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Pedro Aspe               For       For          Management
1.2   Elect Director Winfried Bischoff        For       For          Management
1.3   Elect Director William D. Green         For       For          Management
1.4   Elect Director Charles E. Haldeman, Jr. For       For          Management
1.5   Elect Director Linda Koch Lorimer       For       For          Management
1.6   Elect Director Harold McGraw, III       For       For          Management
1.7   Elect Director Robert P. McGraw         For       For          Management
1.8   Elect Director Hilda Ochoa-Brillembourg For       For          Management
1.9   Elect Director Michael Rake             For       For          Management
1.10  Elect Director Edward B. Rust, Jr.      For       For          Management
1.11  Elect Director Kurt L. Schmoke          For       For          Management
1.12  Elect Director Sidney Taurel            For       For          Management
1.13  Elect Director Richard E. Thornburgh    For       For          Management
2     Change Company Name                     For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Ratify Auditors                         For       For          Management
5     Provide Right to Act by Written Consent Against   For          Shareholder


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METLIFE, INC.

Ticker:       MET            Security ID:  59156R108
Meeting Date: APR 23, 2013   Meeting Type: Annual
Record Date:  MAR 01, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director R. Glenn Hubbard         For       For          Management
1.2   Elect Director Steven A. Kandarian      For       For          Management
1.3   Elect Director John M. Keane            For       For          Management
1.4   Elect Director Alfred F. Kelly, Jr.     For       For          Management
1.5   Elect Director James M. Kilts           For       For          Management
1.6   Elect Director Catherine R. Kinney      For       For          Management
1.7   Elect Director Hugh B. Price            For       For          Management
1.8   Elect Director Kenton J. Sicchitano     For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation


--------------------------------------------------------------------------------

MICROSOFT CORPORATION

Ticker:       MSFT           Security ID:  594918104
Meeting Date: NOV 28, 2012   Meeting Type: Annual
Record Date:  SEP 14, 2012

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Elect Director Steven A. Ballmer        For       For          Management
2     Elect Director Dina Dublon              For       For          Management
3     Elect Director William H. Gates, III    For       For          Management
4     Elect Director Maria M. Klawe           For       For          Management
5     Elect Director Stephen J. Luczo         For       For          Management
6     Elect Director David F. Marquardt       For       For          Management
7     Elect Director Charles H. Noski         For       For          Management
8     Elect Director Helmut Panke             For       For          Management
9     Elect Director John W. Thompson         For       For          Management
10    Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
11    Approve Qualified Employee Stock        For       For          Management
      Purchase Plan
12    Ratify Auditors                         For       For          Management
13    Provide for Cumulative Voting           Against   Against      Shareholder


--------------------------------------------------------------------------------

MOODY'S CORPORATION

Ticker:       MCO            Security ID:  615369105
Meeting Date: APR 16, 2013   Meeting Type: Annual
Record Date:  FEB 20, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Basil L. Anderson        For       For          Management
1.2   Elect Director Darrell Duffie           For       For          Management
1.3   Elect Director Raymond W. McDaniel, Jr. For       For          Management
2     Amend Omnibus Stock Plan                For       Against      Management
3     Amend Non-Employee Director Omnibus     For       Against      Management
      Stock Plan
4     Declassify the Board of Directors       For       For          Management
5     Ratify Auditors                         For       For          Management
6     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


--------------------------------------------------------------------------------

MORGAN STANLEY

Ticker:       MS             Security ID:  617446448
Meeting Date: MAY 14, 2013   Meeting Type: Annual
Record Date:  MAR 18, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Erskine B. Bowles        For       For          Management
1.2   Elect Director Howard J. Davies         For       For          Management
1.3   Elect Director Thomas H. Glocer         For       For          Management
1.4   Elect Director James P. Gorman          For       For          Management
1.5   Elect Director Robert H. Herz           For       For          Management
1.6   Elect Director  C. Robert Kidder        For       For          Management
1.7   Elect Director Klaus Kleinfeld          For       For          Management
1.8   Elect Director Donald T. Nicolaisen     For       For          Management
1.9   Elect Director Hutham S. Olayan         For       For          Management
1.10  Elect Director James W. Owens           For       For          Management
1.11  Elect Director O. Griffith Sexton       For       For          Management
1.12  Elect Director Ryosuke Tamakoshi        For       For          Management
1.13  Elect Director Masaaki Tanaka           For       For          Management
1.14  Elect Director Laura D. Tyson           For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Amend Omnibus Stock Plan                For       Against      Management
5     Amend Omnibus Stock Plan                For       For          Management
6     Amend Executive Incentive Bonus Plan    For       For          Management


--------------------------------------------------------------------------------

NRG ENERGY, INC.

Ticker:       NRG            Security ID:  629377508
Meeting Date: APR 25, 2013   Meeting Type: Annual
Record Date:  MAR 01, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Kirbyjon H. Caldwell     For       For          Management
1.2   Elect Director David Crane              For       For          Management
1.3   Elect Director Kathleen A. McGinty      For       For          Management
1.4   Elect Director Evan J. Silverstein      For       For          Management
1.5   Elect Director Thomas H. Weidemeyer     For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management


--------------------------------------------------------------------------------

PACKAGING CORPORATION OF AMERICA

Ticker:       PKG            Security ID:  695156109
Meeting Date: MAY 01, 2013   Meeting Type: Annual
Record Date:  MAR 11, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Cheryl K. Beebe          For       For          Management
1.2   Elect Director Hasan Jameel             For       For          Management
1.3   Elect Director Mark W. Kowlzan          For       For          Management
1.4   Elect Director Robert C. Lyons          For       For          Management
1.5   Elect Director Samuel M. Mencoff        For       For          Management
1.6   Elect Director Roger B. Porter          For       For          Management
1.7   Elect Director Thomas S. Souleles       For       For          Management
1.8   Elect Director Paul T. Stecko           For       For          Management
1.9   Elect Director James D. Woodrum         For       For          Management
2     Amend Omnibus Stock Plan                For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Ratify Auditors                         For       For          Management


--------------------------------------------------------------------------------

PFIZER INC.

Ticker:       PFE            Security ID:  717081103
Meeting Date: APR 25, 2013   Meeting Type: Annual
Record Date:  FEB 27, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Dennis A. Ausiello       For       For          Management
1.2   Elect Director M. Anthony Burns         For       For          Management
1.3   Elect Director W. Don Cornwell          For       For          Management
1.4   Elect Director Frances D. Fergusson     For       For          Management
1.5   Elect Director William H. Gray, III     For       For          Management
1.6   Elect Director Helen H. Hobbs           For       For          Management
1.7   Elect Director Constance J. Horner      For       For          Management
1.8   Elect Director James M. Kilts           For       For          Management
1.9   Elect Director George A. Lorch          For       For          Management
1.10  Elect Director Suzanne Nora Johnson     For       For          Management
1.11  Elect Director Ian C. Read              For       For          Management
1.12  Elect Director Stephen W. Sanger        For       For          Management
1.13  Elect Director Marc Tessier-Lavigne     For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Stock Retention/Holding Period          Against   Against      Shareholder
5     Provide Right to Act by Written Consent Against   For          Shareholder


--------------------------------------------------------------------------------

REGAL BELOIT CORPORATION

Ticker:       RBC            Security ID:  758750103
Meeting Date: APR 29, 2013   Meeting Type: Annual
Record Date:  MAR 11, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Christopher L. Doerr     For       For          Management
1b    Elect Director Mark J. Gliebe           For       For          Management
1c    Elect Director Curtis W. Stoelting      For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Approve Omnibus Stock Plan              For       For          Management
4     Ratify Auditors                         For       For          Management


--------------------------------------------------------------------------------

SHUTTERFLY, INC.

Ticker:       SFLY           Security ID:  82568P304
Meeting Date: MAY 21, 2013   Meeting Type: Annual
Record Date:  MAR 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Eric J. Keller           For       For          Management
1.2   Elect Director Nancy J. Schoendorf      For       Against      Management
1.3   Elect Director Michael P. Zeisser       For       For          Management
2     Amend Omnibus Stock Plan                For       Against      Management
3     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
4     Ratify Auditors                         For       For          Management


--------------------------------------------------------------------------------

SOLARWINDS, INC.

Ticker:       SWI            Security ID:  83416B109
Meeting Date: MAY 09, 2013   Meeting Type: Annual
Record Date:  MAR 14, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director J. Benjamin Nye          For       For          Management
1.2   Elect Director Kevin B. Thompson        For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Adjourn Meeting                         For       For          Management


--------------------------------------------------------------------------------

SWIFT TRANSPORTATION COMPANY

Ticker:       SWFT           Security ID:  87074U101
Meeting Date: MAY 08, 2013   Meeting Type: Annual
Record Date:  MAR 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director William Post             For       For          Management
1.2   Elect Director Jerry Moyes              For       For          Management
1.3   Elect Director Richard H. Dozer         For       For          Management
1.4   Elect Director David Vander Ploeg       For       For          Management
1.5   Elect Director Glenn Brown              For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management


--------------------------------------------------------------------------------

THE AES CORPORATION

Ticker:       AES            Security ID:  00130H105
Meeting Date: APR 18, 2013   Meeting Type: Annual
Record Date:  FEB 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Andres R. Gluski         For       For          Management
1.2   Elect Director Zhang Guo Bao            For       Against      Management
1.3   Elect Director Kristina M. Johnson      For       For          Management
1.4   Elect Director Tarun Khanna             For       For          Management
1.5   Elect Director John A. Koskinen         For       For          Management
1.6   Elect Director Philip Lader             For       For          Management
1.7   Elect Director Sandra O. Moose          For       For          Management
1.8   Elect Director John B. Morse, Jr.       For       For          Management
1.9   Elect Director Moises Naim              For       For          Management
1.10  Elect Director Charles O. Rossotti      For       For          Management
1.11  Elect Director Sven Sandstrom           For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


--------------------------------------------------------------------------------

THE GOLDMAN SACHS GROUP, INC.

Ticker:       GS             Security ID:  38141G104
Meeting Date: MAY 23, 2013   Meeting Type: Annual
Record Date:  MAR 25, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Elect Director Lloyd C. Blankfein       For       For          Management
2     Elect Director M. Michele Burns         For       For          Management
3     Elect Director Gary D. Cohn             For       For          Management
4     Elect Director Claes Dahlback           For       For          Management
5     Elect Director William W. George        For       For          Management
6     Elect Director James A. Johnson         For       Against      Management
7     Elect Director Lakshmi N. Mittal        For       For          Management
8     Elect Director Adebayo O. Ogunlesi      For       For          Management
9     Elect Director James J. Schiro          For       For          Management
10    Elect Director Debora L. Spar           For       For          Management
11    Elect Director Mark E. Tucker           For       For          Management
12    Elect Director David A. Viniar          For       For          Management
13    Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
14    Approve Omnibus Stock Plan              For       Against      Management
15    Ratify Auditors                         For       For          Management
16    Establish Board Committee on Human      Against   Against      Shareholder
      Rights
17    Report on Lobbying Payments and Policy  Against   Against      Shareholder
18    Adopt Proxy Access Right                Against   Against      Shareholder
19    Employ Investment Bank to Explore       Against   Against      Shareholder
      Alternatives to Maximize Shareholder
      Value


--------------------------------------------------------------------------------

THE KROGER CO.

Ticker:       KR             Security ID:  501044101
Meeting Date: JUN 27, 2013   Meeting Type: Annual
Record Date:  APR 30, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Reuben V. Anderson       For       For          Management
1b    Elect Director Robert D. Beyer          For       For          Management
1c    Elect Director David B. Dillon          For       For          Management
1d    Elect Director Susan J. Kropf           For       For          Management
1e    Elect Director John T. LaMacchia        For       For          Management
1f    Elect Director David B. Lewis           For       For          Management
1g    Elect Director W. Rodney McMullen       For       For          Management
1h    Elect Director Jorge P. Montoya         For       For          Management
1i    Elect Director Clyde R. Moore           For       For          Management
1j    Elect Director Susan M. Phillips        For       For          Management
1k    Elect Director Steven R. Rogel          For       For          Management
1l    Elect Director James A. Runde           For       For          Management
1m    Elect Director Ronald L. Sargent        For       For          Management
1n    Elect Director Bobby S. Shackouls       For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management
4     Report on Supply Chain Human Rights     Against   Against      Shareholder
      Risks and Management
5     Require Independent Board Chairman      Against   Against      Shareholder
6     Report on Adopting Extended Producer    Against   Against      Shareholder
      Responsibility Policy
7     Adopt and Implement Sustainable Palm    Against   Against      Shareholder
      Oil Policy


--------------------------------------------------------------------------------

TIME WARNER CABLE INC.

Ticker:       TWC            Security ID:  88732J207
Meeting Date: MAY 16, 2013   Meeting Type: Annual
Record Date:  MAR 22, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Carole Black             For       For          Management
1b    Elect Director Glenn A. Britt           For       For          Management
1c    Elect Director Thomas H. Castro         For       For          Management
1d    Elect Director David C. Chang           For       For          Management
1e    Elect Director James E. Copeland, Jr.   For       For          Management
1f    Elect Director Peter R. Haje            For       For          Management
1g    Elect Director Donna A. James           For       For          Management
1h    Elect Director Don Logan                For       For          Management
1i    Elect Director N.J. Nicholas, Jr.       For       For          Management
1j    Elect Director Wayne H. Pace            For       For          Management
1k    Elect Director Edward D. Shirley        For       For          Management
1l    Elect Director John E. Sununu           For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Report on Lobbying Payments and Policy  Against   Against      Shareholder
5     Pro-rata Vesting of Equity Plan         Against   Against      Shareholder


--------------------------------------------------------------------------------

TRW AUTOMOTIVE HOLDINGS CORP.

Ticker:       TRW            Security ID:  87264S106
Meeting Date: MAY 14, 2013   Meeting Type: Annual
Record Date:  MAR 18, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Jody G. Miller           For       For          Management
1.2   Elect Director John C. Plant            For       For          Management
1.3   Elect Director Neil P. Simpkins         For       For          Management
2     Ratify Auditors                         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


--------------------------------------------------------------------------------

UNITEDHEALTH GROUP INCORPORATED

Ticker:       UNH            Security ID:  91324P102
Meeting Date: JUN 03, 2013   Meeting Type: Annual
Record Date:  APR 05, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director William C. Ballard, Jr.  For       For          Management
1b    Elect Director Edson Bueno              For       For          Management
1c    Elect Director Richard T. Burke         For       For          Management
1d    Elect Director Robert J. Darretta       For       For          Management
1e    Elect Director Stephen J. Hemsley       For       For          Management
1f    Elect Director Michele J. Hooper        For       For          Management
1g    Elect Director Rodger A. Lawson         For       For          Management
1h    Elect Director Douglas W. Leatherdale   For       For          Management
1i    Elect Director Glenn M. Renwick         For       For          Management
1j    Elect Director Kenneth I. Shine         For       For          Management
1k    Elect Director Gail R. Wilensky         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Auditors                         For       For          Management
4     Report on Lobbying Payments and Policy  Against   For          Shareholder


--------------------------------------------------------------------------------

URBAN OUTFITTERS, INC.

Ticker:       URBN           Security ID:  917047102
Meeting Date: MAY 28, 2013   Meeting Type: Annual
Record Date:  MAR 13, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Scott A. Belair          For       For          Management
1.2   Elect Director Robert H. Strouse        For       For          Management
1.3   Elect Director Margaret A. Hayne        For       For          Management
2     Amend Omnibus Stock Plan                For       Against      Management
3     Eliminate Cumulative Voting and Adopt   For       For          Management
      Majority Vote Standard
4     Ratify Auditors                         For       For          Management
5     Require Independent Board Chairman      Against   Against      Shareholder
6     Adopt Policy and Report on Board        Against   For          Shareholder
      Diversity


--------------------------------------------------------------------------------

VALIDUS HOLDINGS, LTD.

Ticker:       VR             Security ID:  G9319H102
Meeting Date: MAY 01, 2013   Meeting Type: Annual
Record Date:  MAR 08, 2013

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Edward J. Noonan         For       For          Management
1.2   Elect Director Mahmoud Abdallah         For       For          Management
1.3   Elect Director Jeffrey W. Greenberg     For       For          Management
1.4   Elect Director John J. Hendrickson      For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers Hamilton  For       For          Management
      Bermuda as Independent Auditors




============================ MFS Lifetime 2010 Fund ============================

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



============================ MFS Lifetime 2015 Fund ============================

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



============================ MFS Lifetime 2020 Fund ============================

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



============================ MFS Lifetime 2025 Fund ============================

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



============================ MFS Lifetime 2030 Fund ============================

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



============================ MFS Lifetime 2035 Fund ============================

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



============================ MFS Lifetime 2040 Fund ============================

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



============================ MFS Lifetime 2045 Fund ============================

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



============================ MFS Lifetime 2050 Fund ============================

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



============================ MFS Lifetime 2055 Fund ============================

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



===================== MFS Lifetime Retirement Income 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 XII

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.