================================================================================ 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 811-02464 ----------------- MFS SERIES TRUST IX (Exact name of registrant as specified in charter) ----------------- 111 Huntington Avenue, Boston, Massachusetts 02199 (Address of principal executive offices) (Zip code) ----------------- Christopher R. Bohane 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, 2017 - June 30, 2018 * MFS Inflation-Adjusted Bond Fund, a series of the Registrant, has a fiscal year end of October 31. The fiscal year ends of the remaining series of the Registrant are April 30. ================================================================================ ITEM 1. PROXY VOTING RECORD. ******************************* FORM N-Px REPORT ******************************* ICA File Number: 811-02464 Reporting Period: 07/01/2017 - 06/30/2018 MFS Series Trust IX =========================== MFS Corporate Bond Fund ============================ MFS SERIES TRUST XIV - MFS INSTITUTIONAL MONEY MARKET PORTFOLIO Ticker: Security ID: 55291X109 Meeting Date: DEC 08, 2017 Meeting Type: Written Consent Record Date: DEC 08, 2017 # Proposal Mgt Rec Vote Cast Sponsor 1 Amend Fundamental Investment For For Management Restriction Regarding Industry Concentration ====================== MFS Inflation - Adjusted Bond Fund ====================== MFS SERIES TRUST XIV - MFS INSTITUTIONAL MONEY MARKET PORTFOLIO Ticker: Security ID: 55291X109 Meeting Date: DEC 08, 2017 Meeting Type: Written Consent Record Date: DEC 08, 2017 # Proposal Mgt Rec Vote Cast Sponsor 1 Amend Fundamental Investment For For Management Restriction Regarding Industry Concentration ========================== MFS Limited Maturity Fund =========================== MFS SERIES TRUST XIV - MFS INSTITUTIONAL MONEY MARKET PORTFOLIO Ticker: Security ID: 55291X109 Meeting Date: DEC 08, 2017 Meeting Type: Written Consent Record Date: DEC 08, 2017 # Proposal Mgt Rec Vote Cast Sponsor 1 Amend Fundamental Investment For For Management Restriction Regarding Industry Concentration ===================== MFS Municipal Limited Maturity Fund ====================== MFS SERIES TRUST XIV - MFS INSTITUTIONAL MONEY MARKET PORTFOLIO Ticker: Security ID: 55291X109 Meeting Date: DEC 08, 2017 Meeting Type: Written Consent Record Date: DEC 08, 2017 # Proposal Mgt Rec Vote Cast Sponsor 1 Amend Fundamental Investment For For Management Restriction Regarding Industry Concentration ========================== MFS Total Return Bond Fund ========================== MFS SERIES TRUST XIV - MFS INSTITUTIONAL MONEY MARKET PORTFOLIO Ticker: Security ID: 55291X109 Meeting Date: DEC 08, 2017 Meeting Type: Written Consent Record Date: DEC 08, 2017 # Proposal Mgt Rec Vote Cast Sponsor 1 Amend Fundamental Investment For For Management Restriction Regarding Industry Concentration ========== END NPX REPORT SIGNATURES Pursuant to the requirements of the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Registrant: MFS SERIES TRUST IX By (Signature and Title): David DiLorenzo* ------------------------------------------ David DiLorenzo, President and Principal Executive Officer Date: August 28, 2018 *By (Signature and Title) /s/ Susan A. Pereira ------------------------------------------ Susan A. Pereira, as attorney-in-fact * Executed by Susan A. Pereira on behalf of David DiLorenzo pursuant to a Power of Attorney dated June 1, 2017. (1) (1) Incorporated by reference to MFS Series Trust XIII (File Nos. 2-74959 and 811-03327) Post-Effective Amendment No. 65 filed with the SEC via EDGAR on June 27, 2017.