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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 811-21780

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

                                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 A. Pereira
                      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: April 30 and October 31*

               Date of reporting period: July 1, 2014 - June 30, 2015

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

*    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.

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ITEM 1.  PROXY VOTING RECORD.



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

ICA File Number: 811-21780
Reporting Period: 07/01/2014 - 06/30/2015
MFS Series Trust XII









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


ABBVIE INC.

Ticker:       ABBV           Security ID:  00287Y109
Meeting Date: MAY 08, 2015   Meeting Type: Annual
Record Date:  MAR 11, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Roxanne S. Austin        For       For          Management
1.2   Elect Director Richard A. Gonzalez      For       For          Management
1.3   Elect Director Glenn F. Tilton          For       Withhold     Management
2     Ratify Ernst & Young LLP as Auditors    For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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ALLISON TRANSMISSION HOLDINGS, INC.

Ticker:       ALSN           Security ID:  01973R101
Meeting Date: MAY 14, 2015   Meeting Type: Annual
Record Date:  MAR 16, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Lawrence E. Dewey        For       For          Management
1.2   Elect Director Thomas W. Rabaut         For       For          Management
1.3   Elect Director Richard V. Reynolds      For       For          Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
3     Approve Omnibus Stock Plan              For       For          Management
4     Approve Executive Incentive Bonus Plan  For       For          Management


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AMERICAN ELECTRIC POWER COMPANY, INC.

Ticker:       AEP            Security ID:  025537101
Meeting Date: APR 21, 2015   Meeting Type: Annual
Record Date:  FEB 23, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Nicholas K. Akins        For       For          Management
1.2   Elect Director David J. Anderson        For       For          Management
1.3   Elect Director J. Barnie Beasley, Jr.   For       For          Management
1.4   Elect Director Ralph D. Crosby, Jr.     For       For          Management
1.5   Elect Director Linda A. Goodspeed       For       For          Management
1.6   Elect Director Thomas E. Hoaglin        For       For          Management
1.7   Elect Director Sandra Beach Lin         For       For          Management
1.8   Elect Director Richard C. Notebaert     For       For          Management
1.9   Elect Director Lionel L. Nowell, III    For       For          Management
1.10  Elect Director Stephen S. Rasmussen     For       For          Management
1.11  Elect Director Oliver G. Richard, III   For       For          Management
1.12  Elect Director Sara Martinez Tucker     For       For          Management
2     Ratify Deloitte & Touche LLP as         For       For          Management
      Auditors
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Approve Omnibus Stock Plan              For       For          Management
5     Eliminate Fair Price Provision          For       For          Management
6     Eliminate Supermajority Vote            For       For          Management
      Requirement
7     Adopt Proxy Access Right                Against   For          Shareholder


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AMERICAN INTERNATIONAL GROUP, INC.

Ticker:       AIG            Security ID:  026874784
Meeting Date: MAY 13, 2015   Meeting Type: Annual
Record Date:  MAR 18, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director W. Don Cornwell          For       For          Management
1b    Elect Director Peter R. Fisher          For       For          Management
1c    Elect Director John H. Fitzpatrick      For       For          Management
1d    Elect Director Peter D. Hancock         For       For          Management
1e    Elect Director William G. Jurgensen     For       For          Management
1f    Elect Director Christopher S. Lynch     For       For          Management
1g    Elect Director George L. Miles, Jr.     For       For          Management
1h    Elect Director Henry S. Miller          For       For          Management
1i    Elect Director Robert S. Miller         For       For          Management
1j    Elect Director Suzanne Nora Johnson     For       For          Management
1k    Elect Director Ronald A. Rittenmeyer    For       For          Management
1l    Elect Director Douglas M. Steenland     For       For          Management
1m    Elect Director Theresa M. Stone         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors


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ASPEN TECHNOLOGY, INC.

Ticker:       AZPN           Security ID:  045327103
Meeting Date: DEC 04, 2014   Meeting Type: Annual
Record Date:  OCT 10, 2014

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Joan C. McArdle          For       For          Management
1.2   Elect Director Simon J. Orebi Gann      For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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AUTOZONE, INC.

Ticker:       AZO            Security ID:  053332102
Meeting Date: DEC 18, 2014   Meeting Type: Annual
Record Date:  OCT 20, 2014

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Douglas H. Brooks        For       For          Management
1.2   Elect Director Linda A. Goodspeed       For       For          Management
1.3   Elect Director Sue E. Gove              For       For          Management
1.4   Elect Director Earl G. Graves, Jr.      For       For          Management
1.5   Elect Director Enderson Guimaraes       For       For          Management
1.6   Elect Director J. R. Hyde, III          For       For          Management
1.7   Elect Director D. Bryan Jordan          For       For          Management
1.8   Elect Director  W. Andrew McKenna       For       For          Management
1.9   Elect Director George R. Mrkonic, Jr.   For       For          Management
1.10  Elect Director Luis P. Nieto            For       For          Management
1.11  Elect Director William C. Rhodes, III   For       For          Management
2     Approve Executive Incentive Bonus Plan  For       For          Management
3     Ratify Auditors                         For       For          Management
4     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
5     Report on Political Contributions       Against   For          Shareholder


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BROADCOM CORPORATION

Ticker:       BRCM           Security ID:  111320107
Meeting Date: MAY 12, 2015   Meeting Type: Annual
Record Date:  MAR 16, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Robert J. Finocchio, Jr. For       For          Management
1b    Elect Director Nancy H. Handel          For       For          Management
1c    Elect Director Eddy W. Hartenstein      For       For          Management
1d    Elect Director Maria M. Klawe           For       For          Management
1e    Elect Director John E. Major            For       For          Management
1f    Elect Director Scott A. McGregor        For       For          Management
1g    Elect Director William T. Morrow        For       For          Management
1h    Elect Director Henry Samueli            For       For          Management
1i    Elect Director Robert E. Switz          For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify KPMG LLP as Auditors             For       For          Management


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CONSTANT CONTACT, INC.

Ticker:       CTCT           Security ID:  210313102
Meeting Date: JUN 02, 2015   Meeting Type: Annual
Record Date:  APR 07, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director John Campbell            For       For          Management
1.2   Elect Director Daniel T. H. Nye         For       For          Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
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 29, 2015   Meeting Type: Annual
Record Date:  MAR 09, 2015

#     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 Candace H. Duncan        For       For          Management
1.5   Elect Director Cynthia A. Glassman      For       For          Management
1.6   Elect Director Richard H. Lenny         For       For          Management
1.7   Elect Director Thomas G. Maheras        For       For          Management
1.8   Elect Director Michael H. Moskow        For       For          Management
1.9   Elect Director David W. Nelms           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 Deloitte & Touche LLP as         For       For          Management
      Auditors


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EDISON INTERNATIONAL

Ticker:       EIX            Security ID:  281020107
Meeting Date: APR 23, 2015   Meeting Type: Annual
Record Date:  FEB 26, 2015

#     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 Theodore F. Craver, Jr.  For       For          Management
1.4   Elect Director Richard T. Schlosberg,   For       For          Management
      III
1.5   Elect Director Linda G. Stuntz          For       For          Management
1.6   Elect Director William P. Sullivan      For       For          Management
1.7   Elect Director Ellen O. Tauscher        For       For          Management
1.8   Elect Director Peter J. Taylor          For       For          Management
1.9   Elect Director Brett White              For       For          Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Claw-back of Payments under             Against   For          Shareholder
      Restatements


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ELI LILLY AND COMPANY

Ticker:       LLY            Security ID:  532457108
Meeting Date: MAY 04, 2015   Meeting Type: Annual
Record Date:  FEB 27, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1a  Elect Director Katherine Baicker        For       For          Management
1.1b  Elect Director J. Erik Fyrwald          For       For          Management
1.1c  Elect Director Ellen R. Marram          For       For          Management
1.1d  Elect Director Jackson P. Tai           For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Ernst & Young LLP as Auditors    For       For          Management


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EXPRESS, INC.

Ticker:       EXPR           Security ID:  30219E103
Meeting Date: JUN 10, 2015   Meeting Type: Annual
Record Date:  APR 13, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Michael F. Devine, III   For       For          Management
1b    Elect Director David G. Kornberg        For       For          Management
1c    Elect Director Mylle H. Mangum          For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors


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GRAMERCY PROPERTY TRUST INC.

Ticker:       GPT            Security ID:  38489R605
Meeting Date: JUN 23, 2015   Meeting Type: Annual
Record Date:  APR 24, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Allan J. Baum            For       For          Management
1.2   Elect Director Gordon F. DuGan          For       For          Management
1.3   Elect Director Thomas D. Eckert         For       For          Management
1.4   Elect Director Gregory F. Hughes        For       For          Management
1.5   Elect Director Jeffrey E. Kelter        For       For          Management
1.6   Elect Director Charles S. Laven         For       For          Management
1.7   Elect Director William H. Lenehan       For       For          Management
2     Approve Omnibus Stock Plan              For       For          Management
3     Ratify Ernst & Young LLP as Auditors    For       For          Management
4     Reduce Authorized Common Stock          For       For          Management
5     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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GRAPHIC PACKAGING HOLDING COMPANY

Ticker:       GPK            Security ID:  388689101
Meeting Date: MAY 20, 2015   Meeting Type: Annual
Record Date:  MAR 23, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Paul D. Carrico          For       For          Management
1.2   Elect Director Philip R. Martens        For       For          Management
1.3   Elect Director Lynn A. Wentworth        For       For          Management
2     Ratify Ernst & Young LLP as Auditors    For       For          Management


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GREAT PLAINS ENERGY INCORPORATED

Ticker:       GXP            Security ID:  391164100
Meeting Date: MAY 05, 2015   Meeting Type: Annual
Record Date:  FEB 24, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Terry Bassham            For       For          Management
1.2   Elect Director David L. Bodde           For       For          Management
1.3   Elect Director Randall C. Ferguson, Jr. For       For          Management
1.4   Elect Director Gary D. Forsee           For       For          Management
1.5   Elect Director Scott D. Grimes          For       For          Management
1.6   Elect Director Thomas D. Hyde           For       For          Management
1.7   Elect Director James A. Mitchell        For       For          Management
1.8   Elect Director Ann D. Murtlow           For       For          Management
1.9   Elect Director John J. Sherman          For       For          Management
1.10  Elect Director Linda H. Talbott         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Deloitte & Touche LLP as         For       For          Management
      Auditors
4     Adopt Quantitative Carbon Dioxide       Against   Against      Shareholder
      Reduction Goals


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INGREDION INCORPORATED

Ticker:       INGR           Security ID:  457187102
Meeting Date: MAY 20, 2015   Meeting Type: Annual
Record Date:  MAR 23, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Luis Aranguren-Trellez   For       For          Management
1b    Elect Director David B. Fischer         For       For          Management
1c    Elect Director Ilene S. Gordon          For       For          Management
1d    Elect Director Paul Hanrahan            For       For          Management
1e    Elect Director Rhonda L. Jordan         For       For          Management
1f    Elect Director Gregory B. Kenny         For       For          Management
1g    Elect Director Barbara A. Klein         For       For          Management
1h    Elect Director Victoria J. Reich        For       For          Management
1i    Elect Director Dwayne A. Wilson         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     Ratify KPMG LLP as Auditors             For       For          Management


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IRON MOUNTAIN INCORPORATED

Ticker:       IRM            Security ID:  462846106
Meeting Date: JAN 20, 2015   Meeting Type: Special
Record Date:  DEC 18, 2014

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Reorganization Plan             For       For          Management
2     Adopt the Jurisdiction of               For       For          Management
      Incorporation as the Exclusive Forum
      for Certain Disputes
3     Approve Omnibus Stock Plan              For       For          Management
4     Adjourn Meeting                         For       For          Management


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JOY GLOBAL INC.

Ticker:       JOY            Security ID:  481165108
Meeting Date: MAR 10, 2015   Meeting Type: Annual
Record Date:  JAN 09, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Edward L. Doheny, II     For       For          Management
1.2   Elect Director Steven L. Gerard         For       For          Management
1.3   Elect Director Mark J. Gliebe           For       For          Management
1.4   Elect Director John T. Gremp            For       For          Management
1.5   Elect Director John Nils Hanson         For       For          Management
1.6   Elect Director Gale E. Klappa           For       For          Management
1.7   Elect Director Richard B. Loynd         For       For          Management
1.8   Elect Director P. Eric Siegert          For       For          Management
1.9   Elect Director James H. Tate            For       For          Management
2     Ratify Ernst & Young LLP as 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 19, 2015   Meeting Type: Annual
Record Date:  MAR 20, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Linda B. Bammann         For       For          Management
1b    Elect Director James A. Bell            For       For          Management
1c    Elect Director Crandall C. Bowles       For       For          Management
1d    Elect Director Stephen B. Burke         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 Laban P. Jackson, Jr.    For       For          Management
1i    Elect Director Michael A. Neal          For       For          Management
1j    Elect Director Lee R. Raymond           For       For          Management
1k    Elect Director William C. Weldon        For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
4     Amend Omnibus Stock Plan                For       For          Management
5     Require Independent Board Chairman      Against   For          Shareholder
6     Report on Lobbying Payments and Policy  Against   Against      Shareholder
7     Amend Bylaws -- Call Special Meetings   Against   For          Shareholder
8     Provide Vote Counting to Exclude        Against   Against      Shareholder
      Abstentions
9     Report on Certain Vesting Program       Against   Against      Shareholder
10    Disclosure of Recoupment Activity from  Against   For          Shareholder
      Senior Officers


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KOHL'S CORPORATION

Ticker:       KSS            Security ID:  500255104
Meeting Date: MAY 14, 2015   Meeting Type: Annual
Record Date:  MAR 11, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Peter Boneparth          For       For          Management
1b    Elect Director Steven A. Burd           For       For          Management
1c    Elect Director Dale E. Jones            For       For          Management
1d    Elect Director Kevin Mansell            For       For          Management
1e    Elect Director John E. Schlifske        For       For          Management
1f    Elect Director Frank V. Sica            For       For          Management
1g    Elect Director Stephanie A. Streeter    For       For          Management
1h    Elect Director Nina G. Vaca             For       For          Management
1i    Elect Director Stephen E. Watson        For       For          Management
2     Ratify Ernst & Young LLP as Auditors    For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Clawback of Incentive Payments          Against   For          Shareholder
5     Adopt Proxy Access Right                Against   For          Shareholder


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LYONDELLBASELL INDUSTRIES NV

Ticker:       LYB            Security ID:  N53745100
Meeting Date: MAY 06, 2015   Meeting Type: Annual
Record Date:  APR 08, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Robin Buchanan Supervisory Board  For       For          Management
1b    Elect Stephen F. Cooper to Supervisory  For       For          Management
      Board
1c    Elect Isabella D. Goren to Supervisory  For       For          Management
      Board
1d    Elect Robert G. Gwin to Supervisory     For       For          Management
      Board
2a    Elect Kevin W. Brown to Management      For       For          Management
      Board
2b    Elect Jeffrey A. Kaplan to Management   For       For          Management
      Board
3     Adopt Financial Statements and          For       For          Management
      Statutory Reports
4     Approve Discharge of Management Board   For       For          Management
5     Approve Discharge of Supervisory Board  For       For          Management
6     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
7     Ratify PricewaterhouseCoopers           For       For          Management
      Accountants N.V. as Auditors
8     Approve Dividends of USD 2.80 Per Share For       For          Management
9     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
10    Authorize Board to Issue Shares up to   For       For          Management
      20 Percent of Authorized Capital
11    Authorize Board to Exclude Preemptive   For       For          Management
      Rights from Share Issuances
12    Amend Qualified Employee Stock          For       For          Management
      Purchase Plan
13    Authorize Repurchase of Up to 10        For       For          Management
      Percent of Issued Share Capital


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MARATHON PETROLEUM CORPORATION

Ticker:       MPC            Security ID:  56585A102
Meeting Date: APR 29, 2015   Meeting Type: Annual
Record Date:  MAR 02, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director David A. Daberko         For       For          Management
1.2   Elect Director Donna A. James           For       For          Management
1.3   Elect Director James E. Rohr            For       For          Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Adopt Quantitative GHG Goals for        Against   Against      Shareholder
      Products and Operations


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MASIMO CORPORATION

Ticker:       MASI           Security ID:  574795100
Meeting Date: JUN 02, 2015   Meeting Type: Annual
Record Date:  APR 15, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Elect Director Joe Kiani                For       Against      Management
2     Ratify Grant Thornton LLP as Auditors   For       For          Management
3     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation


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MEDICAL PROPERTIES TRUST, INC.

Ticker:       MPW            Security ID:  58463J304
Meeting Date: MAY 14, 2015   Meeting Type: Annual
Record Date:  MAR 23, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Edward K. Aldag, Jr.     For       Withhold     Management
1.2   Elect Director G. Steven Dawson         For       For          Management
1.3   Elect Director R. Steven Hamner         For       For          Management
1.4   Elect Director Robert E. Holmes         For       Withhold     Management
1.5   Elect Director Sherry A. Kellett        For       Withhold     Management
1.6   Elect Director William G. McKenzie      For       For          Management
1.7   Elect Director L. Glenn Orr, Jr.        For       Withhold     Management
1.8   Elect Director D. Paul Sparks, Jr.      For       For          Management
2     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
3     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
4     Adopt Majority Voting for Uncontested   For       For          Management
      Election of Directors


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MERCK & CO., INC.

Ticker:       MRK            Security ID:  58933Y105
Meeting Date: MAY 26, 2015   Meeting Type: Annual
Record Date:  MAR 31, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Leslie A. Brun           For       For          Management
1b    Elect Director Thomas R. Cech           For       For          Management
1c    Elect Director Kenneth C. Frazier       For       For          Management
1d    Elect Director Thomas H. Glocer         For       For          Management
1e    Elect Director William B. Harrison, Jr. For       For          Management
1f    Elect Director C. Robert Kidder         For       For          Management
1g    Elect Director Rochelle B. Lazarus      For       For          Management
1h    Elect Director Carlos E. Represas       For       For          Management
1i    Elect Director Patricia F. Russo        For       For          Management
1j    Elect Director Craig B. Thompson        For       For          Management
1k    Elect Director Wendell P. Weeks         For       For          Management
1l    Elect Director Peter C. Wendell         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
4     Amend Omnibus Stock Plan                For       For          Management
5     Amend Executive Incentive Bonus Plan    For       For          Management
6     Provide Right to Act by Written Consent Against   For          Shareholder
7     Pro-rata Vesting of Equity Awards       Against   Against      Shareholder


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METLIFE, INC.

Ticker:       MET            Security ID:  59156R108
Meeting Date: APR 28, 2015   Meeting Type: Annual
Record Date:  FEB 27, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Cheryl W. Grise          For       For          Management
1.2   Elect Director Carlos M. Gutierrez      For       For          Management
1.3   Elect Director R. Glenn Hubbard         For       For          Management
1.4   Elect Director Steven A. Kandarian      For       For          Management
1.5   Elect Director Alfred F. Kelly, Jr.     For       For          Management
1.6   Elect Director Edward J. Kelly, III     For       For          Management
1.7   Elect Director William E. Kennard       For       For          Management
1.8   Elect Director James M. Kilts           For       For          Management
1.9   Elect Director Catherine R. Kinney      For       For          Management
1.10  Elect Director Denise M. Morrison       For       For          Management
1.11  Elect Director Kenton J. Sicchitano     For       For          Management
1.12  Elect Director Lulu C. Wang             For       For          Management
2a    Reduce Supermajority Vote Requirement   For       For          Management
      to Amend Certificate of Incorporation
2b    Reduce Supermajority Vote Requirement   For       For          Management
      to Amend Bylaws
3     Ratify Deloitte & Touche LLP as         For       For          Management
      Auditors
4     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation


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NORTHROP GRUMMAN CORPORATION

Ticker:       NOC            Security ID:  666807102
Meeting Date: MAY 20, 2015   Meeting Type: Annual
Record Date:  MAR 24, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Wesley G. Bush           For       For          Management
1.2   Elect Director Marianne C. Brown        For       For          Management
1.3   Elect Director Victor H. Fazio          For       For          Management
1.4   Elect Director Donald E. Felsinger      For       For          Management
1.5   Elect Director Bruce S. Gordon          For       For          Management
1.6   Elect Director William H. Hernandez     For       For          Management
1.7   Elect Director Madeleine A. Kleiner     For       For          Management
1.8   Elect Director Karl J. Krapek           For       For          Management
1.9   Elect Director Richard B. Myers         For       For          Management
1.10  Elect Director Gary Roughead            For       For          Management
1.11  Elect Director Thomas M. Schoewe        For       For          Management
1.12  Elect Director James S. Turley          For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Amend Omnibus Stock Plan                For       For          Management
4     Ratify Deloitte & Touche LLP as         For       For          Management
      Auditors
5     Require Independent Board Chairman      Against   Against      Shareholder


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

NORWEGIAN CRUISE LINE HOLDINGS LTD.

Ticker:       NCLH           Security ID:  G66721104
Meeting Date: MAY 20, 2015   Meeting Type: Annual
Record Date:  MAR 20, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Adam M. Aron             For       Against      Management
1b    Elect Director Kevin Crowe              For       Against      Management
1c    Elect Director F. Robert Salerno        For       For          Management
1d    Elect Director Walter L. Revell         For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Approve PricewaterhouseCoopers LLP as   For       For          Management
      Auditors and Authorize Board to Fix
      Their Remuneration
4     Amend Bylaws to Clarify the Notice      For       For          Management
      Provisions


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

PTC INC.

Ticker:       PTC            Security ID:  69370C100
Meeting Date: MAR 04, 2015   Meeting Type: Annual
Record Date:  JAN 05, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Thomas F. Bogan          For       For          Management
1.2   Elect Director Janice D. Chaffin        For       For          Management
1.3   Elect Director Donald K. Grierson       For       For          Management
1.4   Elect Director James E. Heppelmann      For       For          Management
1.5   Elect Director Paul A. Lacy             For       For          Management
1.6   Elect Director Robert P. Schechter      For       For          Management
1.7   Elect Director Renato Zambonini         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Amend Executive Incentive Bonus Plan    For       For          Management
4     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors


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

SPX CORPORATION

Ticker:       SPW            Security ID:  784635104
Meeting Date: MAY 08, 2015   Meeting Type: Annual
Record Date:  MAR 16, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Christopher J. Kearney   For       For          Management
1.2   Elect Director Robert F. Hull, Jr.      For       For          Management
1.3   Elect Director Anne K. Altman           For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Amend Omnibus Stock Plan                For       For          Management
4     Adjust Par Value of Common Stock        For       For          Management
5     Ratify Deloitte & Touche LLP as         For       For          Management
      Auditors


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

SUPERIOR ENERGY SERVICES, INC.

Ticker:       SPN            Security ID:  868157108
Meeting Date: MAY 22, 2015   Meeting Type: Annual
Record Date:  APR 08, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Harold J. Bouillion      For       For          Management
1.2   Elect Director David D. Dunlap          For       For          Management
1.3   Elect Director James M. Funk            For       For          Management
1.4   Elect Director Terence E. Hall          For       For          Management
1.5   Elect Director Peter D. Kinnear         For       For          Management
1.6   Elect Director Michael M. McShane       For       For          Management
1.7   Elect Director W. Matt Ralls            For       For          Management
1.8   Elect Director Justin L. Sullivan       For       For          Management
2     Advisory Vote to Ratify Named           For       Against      Management
      Executive Officers' Compensation
3     Amend Omnibus Stock Plan                For       For          Management
4     Ratify KPMG LLP as Auditors             For       For          Management


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

TARGET CORPORATION

Ticker:       TGT            Security ID:  87612E106
Meeting Date: JUN 10, 2015   Meeting Type: Annual
Record Date:  APR 13, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Roxanne S. Austin        For       For          Management
1b    Elect Director Douglas M. Baker, Jr.    For       For          Management
1c    Elect Director Brian C. Cornell         For       For          Management
1d    Elect Director Calvin Darden            For       For          Management
1e    Elect Director Henrique De Castro       For       For          Management
1f    Elect Director Mary E. Minnick          For       For          Management
1g    Elect Director Anne M. Mulcahy          For       Against      Management
1h    Elect Director Derica W. Rice           For       For          Management
1i    Elect Director Kenneth L. Salazar       For       For          Management
1j    Elect Director John G. Stumpf           For       For          Management
2     Ratify Ernst & Young LLP as Auditors    For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Amend Omnibus Stock Plan                For       For          Management
5     Require Independent Board Chairman      Against   For          Shareholder
6     Cease Discrimination in Hiring, Vendor  Against   Against      Shareholder
      Contracts, or Customer Relations


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

TEXTRON INC.

Ticker:       TXT            Security ID:  883203101
Meeting Date: APR 22, 2015   Meeting Type: Annual
Record Date:  FEB 27, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Scott C. Donnelly        For       For          Management
1.2   Elect Director Kathleen M. Bader        For       For          Management
1.3   Elect Director R. Kerry Clark           For       For          Management
1.4   Elect Director James T. Conway          For       For          Management
1.5   Elect Director Ivor J. Evans            For       For          Management
1.6   Elect Director Lawrence K. Fish         For       For          Management
1.7   Elect Director Paul E. Gagne            For       For          Management
1.8   Elect Director Dain M. Hancock          For       For          Management
1.9   Elect Director Lord Powell              For       For          Management
1.10  Elect Director Lloyd G. Trotter         For       For          Management
1.11  Elect Director James L. Ziemer          For       For          Management
2     Approve Omnibus Stock Plan              For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Ratify Ernst & Young LLP as Auditors    For       For          Management
5     Require Independent Board Chairman      Against   Against      Shareholder
6     Claw-back of Payments under             Against   For          Shareholder
      Restatements


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

THE AES CORPORATION

Ticker:       AES            Security ID:  00130H105
Meeting Date: APR 23, 2015   Meeting Type: Annual
Record Date:  FEB 27, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Andres R. Gluski         For       For          Management
1.2   Elect Director Charles L. Harrington    For       For          Management
1.3   Elect Director Kristina M. Johnson      For       For          Management
1.4   Elect Director Tarun Khanna             For       For          Management
1.5   Elect Director Holly K. Koeppel         For       For          Management
1.6   Elect Director Philip Lader             For       For          Management
1.7   Elect Director James H. Miller          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
2     Amend Omnibus Stock Plan                For       For          Management
3     Amend Executive Incentive Bonus Plan    For       For          Management
4     Ratify  Ernst & Young LLP as Auditors   For       For          Management
5     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
6     Provide Right to Call Special Meeting   For       Against      Management
7     Provide Proxy Access Right              For       Against      Management
8     Provide Right to Call Special Meeting   Against   For          Shareholder
9     Proxy Access                            Against   For          Shareholder


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

THE CHILDREN'S PLACE, INC.

Ticker:       PLCE           Security ID:  168905107
Meeting Date: MAY 22, 2015   Meeting Type: Proxy Contest
Record Date:  APR 10, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
      Management Proxy (White Card)           None
1.1   Elect Director Norman Matthews          For       For          Management
1.2   Elect Director Kenneth Reiss            For       For          Management
1.3   Elect Director Stanley W. Reynolds      For       For          Management
2     Ratify BDO USA, LLP as Auditors         For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
#     Proposal                                Diss Rec  Vote Cast    Sponsor
      Dissident Proxy (Blue Card)             None
1.1   Elect Director Seth R. Johnson          For       Did Not Vote Shareholder
1.2   Elect Director Robert L. Mettler        For       Did Not Vote Shareholder
1.3   Management Nominee - Kenneth Reiss      For       Did Not Vote Shareholder
2     Ratify BDO USA, LLP as Auditors         None      Did Not Vote Management
3     Advisory Vote to Ratify Named           None      Did Not Vote Management
      Executive Officers' Compensation


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

THE GOLDMAN SACHS GROUP, INC.

Ticker:       GS             Security ID:  38141G104
Meeting Date: MAY 21, 2015   Meeting Type: Annual
Record Date:  MAR 23, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1a    Elect Director Lloyd C. Blankfein       For       For          Management
1b    Elect Director M. Michele Burns         For       For          Management
1c    Elect Director Gary D. Cohn             For       For          Management
1d    Elect Director Mark Flaherty            For       For          Management
1e    Elect Director William W. George        For       For          Management
1f    Elect Director James A. Johnson         For       Against      Management
1g    Elect Director Lakshmi N. Mittal        For       For          Management
1h    Elect Director Adebayo O. Ogunlesi      For       For          Management
1i    Elect Director Peter Oppenheimer        For       For          Management
1j    Elect Director Debora L. Spar           For       For          Management
1k    Elect Director Mark E. Tucker           For       For          Management
1l    Elect Director David A. Viniar          For       For          Management
1m    Elect Director Mark O. Winkelman        For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Approve Omnibus Stock Plan              For       Against      Management
4     Ratify PricewaterhouseCoopers LLP as    For       For          Management
      Auditors
5     Provide Vote Counting to Exclude        Against   Against      Shareholder
      Abstentions
6     Report on Certain Vesting Program       Against   Against      Shareholder
7     Provide Right to Act by Written Consent Against   For          Shareholder


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

TIME WARNER CABLE INC.

Ticker:       TWC            Security ID:  88732J207
Meeting Date: OCT 09, 2014   Meeting Type: Special
Record Date:  AUG 18, 2014

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Merger Agreement                For       For          Management
2     Advisory Vote on Golden Parachutes      For       For          Management


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

TRW AUTOMOTIVE HOLDINGS CORP.

Ticker:       TRW            Security ID:  87264S106
Meeting Date: NOV 19, 2014   Meeting Type: Special
Record Date:  OCT 17, 2014

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1     Approve Merger Agreement                For       For          Management
2     Advisory Vote on Golden Parachutes      For       Against      Management
3     Adjourn Meeting                         For       For          Management


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

UNUM GROUP

Ticker:       UNM            Security ID:  91529Y106
Meeting Date: MAY 21, 2015   Meeting Type: Annual
Record Date:  MAR 26, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Cynthia L. Egan          For       For          Management
1.2   Elect Director Pamela H. Godwin         For       For          Management
1.3   Elect Director Timothy F. Keaney        For       For          Management
1.4   Elect Director Thomas Kinser            For       For          Management
1.5   Elect Director Gloria C. Larson         For       For          Management
1.6   Elect Director A.S. (Pat) MacMillan,    For       For          Management
      Jr.
1.7   Elect Director Richard P. McKenney      For       For          Management
1.8   Elect Director Edward J. Muhl           For       For          Management
1.9   Elect Director William J. Ryan          For       For          Management
1.10  Elect Director Thomas R. Watjen         For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify Ernst & Young LLP as Auditors    For       For          Management


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

VALERO ENERGY CORPORATION

Ticker:       VLO            Security ID:  91913Y100
Meeting Date: APR 30, 2015   Meeting Type: Annual
Record Date:  MAR 03, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1a  Elect Director Jerry D. Choate          For       For          Management
1.1b  Elect Director Joseph W. Gorder         For       For          Management
1.1c  Elect Director Deborah P. Majoras       For       For          Management
1.1d  Elect Director Donald L. Nickles        For       For          Management
1.1e  Elect Director Philip J. Pfeiffer       For       For          Management
1.1f  Elect Director Robert A. Profusek       For       For          Management
1.1g  Elect Director Susan Kaufman Purcell    For       For          Management
1.1h  Elect Director Stephen M. Waters        For       For          Management
1.1i  Elect Director Randall J. Weisenburger  For       For          Management
1.1j  Elect Director Rayford Wilkins, Jr.     For       For          Management
2     Ratify KPMG LLP as Auditors             For       For          Management
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Adopt Quantitative GHG Goals for        Against   Against      Shareholder
      Products and Operations


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

VALIDUS HOLDINGS, LTD.

Ticker:       VR             Security ID:  G9319H102
Meeting Date: MAY 07, 2015   Meeting Type: Annual
Record Date:  MAR 13, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Michael E.A. Carpenter   For       For          Management
1.2   Elect Director  Therese M. (Terri)      For       For          Management
      Vaughan
1.3   Elect Director Christopher E. Watson    For       For          Management
2     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
3     Ratify PricewaterhouseCoopers, Ltd.,    For       For          Management
      Hamilton, Bermuda as Auditors
4     Amend Omnibus Stock Plan                For       For          Management


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

WASHINGTON PRIME GROUP INC.

Ticker:       WPG            Security ID:  92939N102
Meeting Date: MAY 21, 2015   Meeting Type: Annual
Record Date:  MAR 27, 2015

#     Proposal                                Mgt Rec   Vote Cast    Sponsor
1.1   Elect Director Mark S. Ordan            For       For          Management
1.2   Elect Director Michael P. Glimcher      For       For          Management
1.3   Elect Director Louis G. Conforti        For       For          Management
1.4   Elect Director Robert J. Laikin         For       For          Management
1.5   Elect Director Niles C. Overly          For       For          Management
1.6   Elect Director Jacquelyn R. Soffer      For       For          Management
1.7   Elect Director Richard S. Sokolov       For       For          Management
1.8   Elect Director Marvin L. White          For       For          Management
2     Change Company Name from Washington     For       For          Management
      Prime Group Inc. to WP Glimcher Inc.
3     Advisory Vote to Ratify Named           For       For          Management
      Executive Officers' Compensation
4     Advisory Vote on Say on Pay Frequency   One Year  One Year     Management
5     Ratify Ernst & Young LLP as Auditors    For       For          Management




============================ 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 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):  ROBIN STELMACH*
                           -----------------------------------------
                           Robin Stelmach, Principal Executive
                           Officer & President

Date: August 26, 2015

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

*    Executed by Susan A. Pereira on behalf of Robin Stelmach pursuant to a
     Power of Attorney dated October 1, 2014. (1)

(1)  Incorporated by reference to MFS Institutional Trust (File Nos. 33-37615
     and 811-06174) Post-Effective Amendment No. 38 filed with the SEC via
     EDGAR on October 27, 2014.