Company:  MFS SERIES TRUST X (BMSBX)
Form Type:  N-CEN
Filing Date:  1/14/2020 
CIK:  0000783740 
Address:  111 HUNTINGTON AVENUE
24TH FLOOR
 
City, State, Zip:  BOSTON, Massachusetts 02199 
Telephone:  18006372929 
Fiscal Year:  11/30 
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  FORM N-CEN
  FORM INTERNAL CONTROL RPT