X0201 N-CEN/A 0001752724-18-002731 LIVE 0000911637 XXXXXXXX 811-07992 false false false N-1A true MFS SERIES TRUST XI 811-07992 0000911637 549300O3TPADV1WWUX67 111 HUNTINGTON AVENUE 24TH FLOOR BOSTON 02199 US-MA US 617-954-5000 DST Systems, Inc. 333 West 11th Street Kansas City 64105-1628 816-435-8655 Technology Vendor Institutional Shareholder Services Inc. 702 King Farm Boulevard Rockville 20850 1-301-556-0500 Proxy Voting Administrator State Street Bank and Trust Company 1 Lincoln Street Boston 02111 617-786-3000 Custody and Accounting Records. Autonomy Americas LLC 90 Park Avenue New York 10016 44-122-344-8000 Storage Vendor Massachusetts Financial Services Company 111 Huntington Avenue Boston 02199-7632 617-954-5000 Investment Adviser Record MFS Service Center, Inc 100 Hancock Street Quincy 02171 1-617-954-5000 Transfer Agency Record Iron Mountain, Inc. 150 SE Second Street Miami 33131 N-A Storage Vendor The Depository Trust Company 55 Water Street New York 10041 1-212-855-1000 DTC MFS Fund Distributors, Inc. 111 Huntington Avenue Boston 02199 1-617-954-5000 Principal Underwriter Record TerraNua Limited (New York, NY, US, Branch) 535 Fifth Avenue New York 10017 N-A Personal Trading System Ropes & Gray LLP 800 Boylston Street Boston 02199-3600 1-617-951-7000 Counsel Record Y N N-1A 2 Y Maureen R. Goldfarb 000000000 N Robert J. Manning 004646484 Y Maryanne L. Roepke 000000000 N Michael Hegarty 000000000 N Robin A. Stelmach 000000000 Y Laurie J. Thomsen 000000000 N Steven E. Buller 000000000 N John P. 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