X0404 N-CEN LIVE 0000783740 XXXXXXXX 811-04492 false false false N-1A S000002511 C000074224 C000006902 C000006901 C000074226 C000074227 C000034483 C000074225 C000006900 C000006903 MFS SERIES TRUST X 811-04492 0000783740 5493001MUVNRNUPJY164 111 HUNTINGTON AVENUE BOSTON 02199 US-MA US 617-954-5000 Ropes & Gray LLP 800 Boylston Street Boston 02199-3600 617-951-7000 Counsel Record Mycomplianceoffice Limited (New York, NY, US, Branch) 535 5th Avenue 4th Floor New York 10017 866-951-2280 Personal Trading System Micro Focus, LLC 4555 Great America Parkway Suite 400 Santa Clara 95054-1243 650-258-6827 Storage Vendor SS&C Technologies, Inc. 333 West 11th Street Kansas City 64105 816-435-1000 Technology Vendor MFS Service Center, Inc. 111 Huntington Avenue Boston 02199 617-954-5000 Transfer Agency Record Icertis, Inc. 14711 NE 29th Place Suite 100 Bellevue 98007 425-869-7649 Contract Management System Iron Mountain, Inc. 1 Federal Street Boston 02110 800-899-4766 Storage Vendor Institutional Shareholder Services Inc. 702 King Farm Boulevard Suite 400 Rockville 20850-4045 301-556-0500 Proxy Voting Administrator State Street Bank and Trust Company 1 Congress Street Suite 1 Boston 02114 617-786-3000 Custody and Accounting Records Massachusetts Financial Services Company 111 Huntington Avenue Boston 02199 617-954-5000 Investment Adviser Record The Depository Trust Company 55 Water Street New York 10041 212-855-1000 Central Clearinghouse Charles River Development 700 District Avenue Burlington 01803 781-238-0099 Investment related records MFS Fund Distributors, Inc. 111 Huntington Avenue Boston 02199 617-954-5000 Principal Underwriter Record N N N-1A 17 Y Laurie J. Thomsen N/A N Peter D. Jones N/A N John P. Kavanaugh N/A N Michael W. Roberge N/A Y Maryanne L. Roepke N/A N Clarence Otis, Jr. N/A N Maureen R. Goldfarb N/A N James W. Kilman, Jr. N/A N Steven E. Buller N/A N John A. Caroselli N/A N Rosa E. Licea-Mailloux N/A 111 Huntington Avenue Boston 02199 XXXXXX N N N N N N N MFS Fund Distributors, Inc. 8-45321 000031052 N/A Y N Ernst & Young LLP 42 N/A N N N N N N N MFS Emerging Markets Debt Fund S000002511 509D6AOZZ4SJ08T5BZ82 N 9 0 0 N/A N N Y N N Goldman Sachs Bank USA KD3XUN7C6T14HNAYLU02 N N Cash collateral reinvestment fee Revenue sharing split 14802.37000000 52.00000000 Rule 18f-4(f)(17 CFR 270.18f-4(f)) Rule 18f-4 (17 CFR 270.18f-4) Rule 18f-4(c)(4) (17CFR 270.18f-4(c)(4)) Rule 32a-4 (17 CFR 270.32a-4) Rule 12d1-1 (17 CFR 270.12d1-1) Rule 22d-1 (17 CFR 270.22d-1) Y Y N N Massachusetts Financial Services Company 801-17352 000110045 1G3OSH3GLGJ7X1JC5I61 N MFS Service Center, Inc. 084-01316 N/A Y N N ICE Data Pricing & Reference Data, LLC 5493000NQ9LYLDBCTL34 N London Stock Exchange Group PLC 213800QAUUUP6I445N30 GB N N State Street Bank and Trust Company 571474TGEMMWANRLN572 N N Bank - section 17(f)(1) (15 U.S.C. 80a-17(f)(1)) Citibank del Peru S.A. MYTK5NHHP1G8TVFGT193 PE N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) State Street Bank and Trust Company (Edinburgh, GB, Branch) 571474TGEMMWANRLN572 GB N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) The Hongkong and Shanghai Banking Corporation Limited (Colombo, Western, LK, Branch) 2HI3YI5320L3RW6NJ957 LK N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Citibank, National Association (Singapore, SG, Branch) E57ODZWZ7FF32TWEFA76 SG N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Citibank, Anonim Sirketi CWZ8NZDH5SKY12Q4US31 TR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) BNP Paribas R0MUWSFPU8MPRO8K5P83 FR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Citibank, National Association (Mumbai, Maharashtra, IN, Branch) E57ODZWZ7FF32TWEFA76 IN N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Euroclear Bank 549300OZ46BRLZ8Y6F65 BE N Y Foreign securities depository - rule 17f-7 (17 CFR 270.17f-7) Intesa Sanpaolo S.p.A. 2W8N8UU78PMDQKZENC08 IT N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) The Hongkong and Shanghai Banking Corporation Limited (Ebene, Plaines Wilhems, MU, Branch) 2HI3YI5320L3RW6NJ957 MU N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) State Street Trust Company Canada 549300L71XG2CTQ2V827 CA N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Citibank, National Association (Sao Paulo, Sao Paulo, BR, Branch) E57ODZWZ7FF32TWEFA76 BR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Skandinaviska Enskilda Banken AB (Copenhagen, Hovedstaden, DK, Branch) F3JS33DEI6XQ4ZBPTN86 DK N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Skandinaviska Enskilda Banken AB (Oslo, Oslo, NO, Branch) F3JS33DEI6XQ4ZBPTN86 NO N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) UniCredit Bank Czech Republic and Slovakia, a.s. KR6LSKV3BTSJRD41IF75 CZ N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Skandinaviska Enskilda Banken AB (Helsinki, Uusimaa, FI, Branch) F3JS33DEI6XQ4ZBPTN86 FI N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) The Hongkong and Shanghai Banking Corporation Limited (Sydney, NSW, AU, Branch) 2HI3YI5320L3RW6NJ957 AU N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) State Street Bank International GmbH ZMHGNT7ZPKZ3UFZ8EO46 DE N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) The Hongkong and Shanghai Banking Corporation Limited 2HI3YI5320L3RW6NJ957 HK N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) UBS Switzerland AG 549300WOIFUSNYH0FL22 CH N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) UniCredit Bank Hungary Zrt. 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(Bratislava, Bratislavsky, SK, Branch) KR6LSKV3BTSJRD41IF75 SK N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Standard Chartered Bank Malaysia Berhad 549300JTJBG2QBI8KD48 MY N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Deutsche Bank Aktiengesellschaft (Makati City, Metro Manila, PH, Branch) 7LTWFZYICNSX8D621K86 PH N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Bank Handlowy w Warszawie Spolka Akcyjna XLEZHWWOI4HFQDGL4793 PL N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Citibank, National Association (Cairo, Cairo, EG, Branch) E57ODZWZ7FF32TWEFA76 EG N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) UniCredit Bank Austria AG D1HEB8VEU6D9M8ZUXG17 AT N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Bank Hapoalim B.M. B6ARUI4946ST4S7WOU88 IL N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Mizuho Bank, Ltd. (Minato ku, Tokyo, JP, Branch) RB0PEZSDGCO3JS6CEU02 JP N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) The Hongkong and Shanghai Banking Corporation Limited (Jung-gu, Seoul, KR, Branch) 2HI3YI5320L3RW6NJ957 KR N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Joint Stock Company 'Commercial Bank CitiBank' CHSQDSVI1UI96Y2SW097 RU N Y Foreign custodian - rule 17f-5 (17 CFR 270.17f-5) Y MFS Service Center, Inc. 084-01316 SEC File Number Y N N Massachusetts Financial Services Company 1G3OSH3GLGJ7X1JC5I61 Y N N Goldman Sachs & Co. LLC 8-129 000000361 FOR8UP27PHTHYVLBNG30 173778.00000000 BofA Securities, Inc. 8-69787 000283942 549300HN4UKV1E2R3U73 191242.80000000 Citigroup Global Markets Inc. 8-8177 000007059 MBNUM2BPBDO7JBLYG310 1824.11000000 BMO Capital Markets Corp. 8-34344 000016686 RUC0QBLBRPRCU4W1NE59 3.31000000 Peel Hunt LLP 8-68845 000157321 5493007DWN0R4YBM4C84 GB 56.18000000 366904.40000000 BNP Paribas Securities Corp. 8-32682 000015794 RCNB6OTYUAMMP879YW96 424552936.53000000 Jefferies LLC 8-15074 000002347 58PU97L1C0WSRCWADL48 384489841.64000000 J.P. Morgan Securities LLC 8-35008 000000079 ZBUT11V806EZRVTWT807 958016162.02000000 Barclays Capital Inc. 8-41342 000019714 AC28XWWI3WIBK2824319 464683202.40000000 BofA Securities, Inc. 8-69787 000283942 549300HN4UKV1E2R3U73 570840638.15000000 HSBC Securities (USA) Inc. 8-41562 000019585 CYYGQCGNHMHPSMRL3R97 462116841.74000000 Morgan Stanley & Co. LLC 8-15869 000008209 9R7GPTSO7KV3UQJZQ078 454579194.53000000 Goldman Sachs & Co. LLC 8-129 000000361 FOR8UP27PHTHYVLBNG30 685464511.00000000 BNY Capital Markets, LLC 8-35255 000017454 VJW2DOOHGDT6PR0ZRO63 584841775.91000000 Citigroup Global Markets Inc. 8-8177 000007059 MBNUM2BPBDO7JBLYG310 1032186421.45000000 7112781629.42000000 N 6715342187.43615384 Uncommitted 200000000.00000000 N Uncommitted 100000000.00000000 N Committed 1450000000.00000000 N N N N true