NPORT-P false 0000783740 XXXXXXXX S000050658 C000160023 C000160020 C000160028 C000160025 C000160026 C000160024 C000160027 C000160022 C000160021 MFS SERIES TRUST X 811-04492 0000783740 5493001MUVNRNUPJY164 111 HUNTINGTON AVENUE 24TH FLOOR BOSTON 02199 617-954-5000 MFS Blended Research Growth Equity Fund S000050658 549300M0GLI3GVVPMM34 2020-05-31 2020-05-31 N 207643902.31 220526.76 207423375.55 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 11504.07000000 N Alphabet Inc 5493006MHB84DD0ZWV18 02079K107 3317.00000000 NS USD 4739727.64000000 2.285049902129 Long EC CORP US N 1 N N N Altria Group Inc XSGZFLO9YTNO9VCQV219 02209S103 21929.00000000 NS USD 856327.45000000 0.412840379118 Long EC CORP US N 1 N N N Lockheed Martin Corp DPRBOZP0K5RM2YE8UU08 539830109 1246.00000000 NS USD 483996.24000000 0.233337365529 Long EC CORP US N 1 N N N Alphabet Inc 5493006MHB84DD0ZWV18 02079K305 3183.00000000 NS USD 4562894.16000000 2.199797466366 Long EC CORP US N 1 N N N Biogen Inc W8J5WZB5IY3K0NDQT671 09062X103 8543.00000000 NS USD 2623469.87000000 1.264789883514 Long EC CORP US N 1 N N N UnitedHealth Group Inc 549300GHBMY8T5GXDE41 91324P102 4420.00000000 NS USD 1347437.00000000 0.649607112229 Long EC CORP US N 1 N N N Cummins Inc ZUNI8PYC725B6H8JU438 231021106 4761.00000000 NS USD 807465.60000000 0.389283800757 Long EC CORP US N 1 N N N DocuSign Inc 549300Q7PVDWRZ39JG09 256163106 2847.00000000 NS USD 397839.78000000 0.191800841609 Long EC CORP US N 1 N N N West Pharmaceutical Services Inc 5493007NKRGM1RJQ1P16 955306105 2029.00000000 NS USD 438345.16000000 0.211328717815 Long EC CORP US N 1 N N N AGCO Corp LYOM0B2GCF1JWXK5ZG04 001084102 31007.00000000 NS USD 1712516.61000000 0.825614087833 Long EC CORP US N 1 N N N Amazon.com Inc ZXTILKJKG63JELOEG630 023135106 5299.00000000 NS USD 12942118.63000000 6.239469681603 Long EC CORP US N 1 N N N Humana Inc 529900YLDW34GJAO4J06 444859102 7594.00000000 NS USD 3118476.10000000 1.503435228421 Long EC CORP US N 1 N N N AES Corp/The 2NUNNB7D43COUIRE5295 00130H105 15672.00000000 NS USD 195743.28000000 0.094368958889 Long EC CORP US N 1 N N N Fidelity National Information Services Inc 6WQI0GK1PRFVBA061U48 31620M106 18964.00000000 NS USD 2632772.12000000 1.269274551635 Long EC CORP US N 1 N N N Illumina Inc SQ95QG8SR5Q56LSNF682 452327109 7197.00000000 NS USD 2612870.85000000 1.259680035131 Long EC CORP US N 1 N N N Mastercard Inc AR5L2ODV9HN37376R084 57636Q104 17072.00000000 NS USD 5136794.08000000 2.476477912086 Long EC CORP US N 1 N N N Synchrony Financial 549300RS7EWPM9MA6C78 87165B103 22240.00000000 NS USD 453028.80000000 0.218407784946 Long EC CORP US N 1 N N N Home Depot Inc/The QEKMOTMBBKA8I816DO57 437076102 6018.00000000 NS USD 1495352.64000000 0.720918091336 Long EC CORP US N 1 N N N Adobe Inc FU4LY2G4933NH2E1CP29 00724F101 12722.00000000 NS USD 4918325.20000000 2.371152810987 Long EC CORP US N 1 N N N Dollar General Corp OPX52SQVOZI8IVSWYU66 256677105 14430.00000000 NS USD 2763489.30000000 1.332294054453 Long EC CORP US N 1 N N N Huntington Ingalls Industries Inc 5TZLZ6WJTBVJ0QWBG121 446413106 2695.00000000 NS USD 538703.55000000 0.259712073709 Long EC CORP US N 1 N N N Hartford Financial Services Group Inc/The IU7C3FTM7Y3BQM112U94 416515104 13346.00000000 NS USD 511018.34000000 0.246364875050 Long EC CORP US N 1 N N N Danaher Corp S4BKK9OTCEWQ3YHPFM11 235851102 7334.00000000 NS USD 1221917.74000000 0.589093556480 Long EC CORP US N 1 N N N CSX Corp 549300JVQR4N1MMP3Q88 126408103 10448.00000000 NS USD 747867.84000000 0.360551378559 Long EC CORP US N 1 N N N Sun Communities Inc 549300H5GEOJYN41ZG57 866674104 9124.00000000 NS USD 1251721.56000000 0.603462149182 Long EC CORP US N 1 N N N Northrop Grumman Corp RIMU48P07456QXSO0R61 666807102 3693.00000000 NS USD 1237893.60000000 0.596795610291 Long EC CORP US N 1 N N N Cigna Corp 549300VIWYMSIGT1U456 125523100 5608.00000000 NS USD 1106570.56000000 0.533484018889 Long EC CORP US N 1 N N N Accenture PLC N/A 000000000 9181.00000000 NS USD 1851073.22000000 0.892413024853 Long EC CORP IE N 1 N N N Microsoft Corp INR2EJN1ERAN0W5ZP974 594918104 108101.00000000 NS USD 19809508.25000000 9.550277637452 Long EC CORP US N 1 N N N Activision Blizzard Inc 549300TPQQDBP9GNOF40 00507V109 9314.00000000 NS USD 670421.72000000 0.323214159552 Long EC CORP US N 1 N N N Walmart Inc Y87794H0US1R65VBXU25 931142103 6443.00000000 NS USD 799318.58000000 0.385356075649 Long EC CORP US N 1 N N N Facebook Inc BQ4BKCS1HXDV9HN80Z93 30303M102 41029.00000000 NS USD 9235217.61000000 4.452351421584 Long EC CORP US N 1 N N N Eli Lilly and Co FRDRIPF3EKNDJ2CQJL29 532457108 27198.00000000 NS USD 4159934.10000000 2.005528108377 Long EC CORP US N 1 N N N Apple Inc HWUPKR0MPOU8FGXBT394 037833100 53446.00000000 NS USD 16992621.24000000 8.192240240494 Long EC CORP US N 1 N N N Honeywell International Inc ISRPG12PN4EIEOEMW547 438516106 12376.00000000 NS USD 1805039.60000000 0.870219952410 Long EC CORP US N 1 N N N MetLife Inc C4BXATY60WC6XEOZDX54 59156R108 38111.00000000 NS USD 1372377.11000000 0.661630882421 Long EC CORP US N 1 N N N Applied Materials Inc 41BNNE1AFPNAZELZ6K07 038222105 48209.00000000 NS USD 2708381.62000000 1.305726325597 Long EC CORP US N 1 N N N Leidos Holdings Inc 549300IUTGTP6EJP8124 525327102 21442.00000000 NS USD 2257628.18000000 1.088415504768 Long EC CORP US N 1 N N N Fiserv Inc GI7UBEJLXYLGR2C7GV83 337738108 25207.00000000 NS USD 2691351.39000000 1.297515953958 Long EC CORP US N 1 N N N Texas Instruments Inc WDJNR2L6D8RWOEB8T652 882508104 18293.00000000 NS USD 2172110.82000000 1.047187094627 Long EC CORP US N 1 N N N Take-Two Interactive Software Inc BOMSTHHJK882EWYX3334 874054109 19398.00000000 NS USD 2641425.66000000 1.273446472942 Long EC CORP US N 1 N N N VeriSign Inc LMPL4N8ZOJRMF0KOF759 92343E102 5380.00000000 NS USD 1178273.80000000 0.568052562482 Long EC CORP US N 1 N N N Boston Scientific Corp Y6ZDD9FP4P8JSSJMW954 101137107 36477.00000000 NS USD 1385761.23000000 0.668083443500 Long EC CORP US N 1 N N N Atlassian Corp PLC 549300AGBII4MWBVJY22 000000000 791.00000000 NS USD 146572.30000000 0.070663347181 Long EC CORP GB N 1 N N N SBA Communications Corp 5299001HX8ZN8Y8QIT49 78410G104 2058.00000000 NS USD 646479.54000000 0.311671497142 Long EC CORP US N 1 N N N Eaton Corp PLC 549300VDIGTMXUNT7H71 000000000 15690.00000000 NS USD 1332081.00000000 0.642203896483 Long EC CORP IE N 1 N N N Philip Morris International Inc HL3H1H2BGXWVG3BSWR90 718172109 13662.00000000 NS USD 1002244.32000000 0.483187739733 Long EC CORP US N 1 N N N Vistra Energy Corp 549300KP43CPCUJOOG15 92840M102 30371.00000000 NS USD 620783.24000000 0.299283163411 Long EC CORP US N 1 N N N HCA Healthcare Inc 529900PH4ZGUH2MNEU89 40412C101 11873.00000000 NS USD 1269223.70000000 0.611900031341 Long EC CORP US N 1 N N N Regeneron Pharmaceuticals Inc 549300RCBFWIRX3HYQ56 75886F107 697.00000000 NS USD 427128.57000000 0.205921135391 Long EC CORP US N 1 N N N NVIDIA Corp 549300S4KLFTLO7GSQ80 67066G104 10799.00000000 NS USD 3833860.98000000 1.848326385507 Long EC CORP US N 1 N N N Motorola Solutions Inc 6S552MUG6KGJVEBSEC55 620076307 7204.00000000 NS USD 974917.32000000 0.470013236172 Long EC CORP US N 1 N N N Illinois Tool Works Inc 76NA4I14SZCFAYMNSV04 452308109 4292.00000000 NS USD 740198.32000000 0.356853858942 Long EC CORP US N 1 N N N ServiceNow Inc 549300HJTQM36M0E1G39 81762P102 9196.00000000 NS USD 3567404.28000000 1.719866080927 Long EC CORP US N 1 N N N Lear Corp 549300UPNBTXA1SYTQ33 521865204 11127.00000000 NS USD 1180018.35000000 0.568893620051 Long EC CORP US N 1 N N N Domino's Pizza Inc 5299004V0Y8MI5D9FF45 25754A201 4560.00000000 NS USD 1759430.40000000 0.848231495285 Long EC CORP US N 1 N N N Eastman Chemical Co FDPVHDGJ1IQZFK9KH630 277432100 17326.00000000 NS USD 1179554.08000000 0.568669792819 Long EC CORP US N 1 N N N Global Payments Inc 549300NOMHGVQBX6S778 37940X102 8085.00000000 NS USD 1451176.65000000 0.699620592979 Long EC CORP US N 1 N N N McKesson Corp 549300WZWOM80UCFSF54 58155Q103 14250.00000000 NS USD 2261047.50000000 1.090063978567 Long EC CORP US N 1 N N N Akamai Technologies Inc OC1LZNN2LF5WTJ5RIL89 00971T101 2329.00000000 NS USD 246408.20000000 0.118794807647 Long EC CORP US N 1 N N N Starbucks Corp OQSJ1DU9TAOC51A47K68 855244109 41586.00000000 NS USD 3243292.14000000 1.563609757772 Long EC CORP US N 1 N N N PRA Health Sciences Inc 549300R1HR1VWWHIAK47 69354M108 6582.00000000 NS USD 681237.00000000 0.328428268122 Long EC CORP US N 1 N N N MFS Institutional Money Market Portfolio 5L2W638H85N8T1136O07 55291X109 837197.04800000 NS USD 837280.77000000 0.403657865358 Long STIV RF US N 1 N N N Kansas City Southern 5493008C12PZMWP3WY03 485170302 8495.00000000 NS USD 1278667.40000000 0.616452893320 Long EC CORP US N 1 N N N Kimberly-Clark Corp MP3J6QPYPGN75NVW2S34 494368103 18763.00000000 NS USD 2653838.72000000 1.279430880421 Long EC CORP US N 1 N N N Zoetis Inc 549300HD9Q1LOC9KLJ48 98978V103 10542.00000000 NS USD 1469449.38000000 0.708429981000 Long EC CORP US N 1 N N N eBay Inc OML71K8X303XQONU6T67 278642103 13699.00000000 NS USD 623852.46000000 0.300762851990 Long EC CORP US N 1 N N N Citigroup Inc 6SHGI4ZSSLCXXQSBB395 172967424 4866.00000000 NS USD 233130.06000000 0.112393340134 Long EC CORP US N 1 N N N Chipotle Mexican Grill Inc N/A 169656105 889.00000000 NS USD 892475.99000000 0.430267797751 Long EC CORP US N 1 N N N Target Corp 8WDDFXB5T1Z6J0XC1L66 87612E106 14926.00000000 NS USD 1825897.58000000 0.880275704297 Long EC CORP US N 1 N N N Eagle Materials Inc 529900KRXRGXL61SG039 26969P108 4004.00000000 NS USD 267307.04000000 0.128870258374 Long EC CORP US N 1 N N N S&P Global Inc Y6X4K52KMJMZE7I7MY94 78409V104 3596.00000000 NS USD 1168771.92000000 0.563471651592 Long EC CORP US N 1 N N N AmerisourceBergen Corp AI8GXW8LG5WK7E9UD086 03073E105 2607.00000000 NS USD 248551.38000000 0.119828047027 Long EC CORP US N 1 N N N RingCentral Inc 549300C8EH0H1614VE84 76680R206 7532.00000000 NS USD 2065651.00000000 0.995862204306 Long EC CORP US N 1 N N N Cisco Systems Inc 8E6NF1YAL0WT6CWXXV93 17275R102 11981.00000000 NS USD 572931.42000000 0.276213526311 Long EC CORP US N 1 N N N Waste Management Inc 549300YX8JIID70NFS41 94106L109 5686.00000000 NS USD 606980.50000000 0.292628783226 Long EC CORP US N 1 N N N Skechers USA Inc 529900D2R54KZPA4XR56 830566105 5535.00000000 NS USD 173356.20000000 0.083576019115 Long EC CORP US N 1 N N N Netflix Inc 549300Y7VHGU0I7CE873 64110L106 1604.00000000 NS USD 673246.92000000 0.324576204689 Long EC CORP US N 1 N N N Ross Stores Inc 549300ENZFLPGRDFZQ60 778296103 8227.00000000 NS USD 797689.92000000 0.384570889315 Long EC CORP US N 1 N N N Johnson & Johnson 549300G0CFPGEF6X2043 478160104 17396.00000000 NS USD 2587655.00000000 1.247523329103 Long EC CORP US N 1 N N N NRG Energy Inc 5E2UPK5SW04M13XY7I38 629377508 46369.00000000 NS USD 1671602.45000000 0.805889136442 Long EC CORP US N 1 N N N Electronic Arts Inc 549300O7A67PUEYKDL45 285512109 20375.00000000 NS USD 2503680.00000000 1.207038499571 Long EC CORP US N 1 N N N Okta Inc 549300N8J06I8MRHU620 679295105 8241.00000000 NS USD 1611774.78000000 0.777045873314 Long EC CORP US N 1 N N N General Mills Inc 2TGYMUGI08PO8X8L6150 370334104 10590.00000000 NS USD 667593.60000000 0.321850706666 Long EC CORP US N 1 N N N Burlington Stores Inc 5299003Z37DVGKKC1W09 122017106 7845.00000000 NS USD 1644861.15000000 0.792997002212 Long EC CORP US N 1 N N N Charter Communications Inc 0J0XRGZE3PBRFEZ7MV65 16119P108 5216.00000000 NS USD 2837504.00000000 1.367976966181 Long EC CORP US N 1 N N N American Homes 4 Rent 549300ZJUO7A58PNUW40 02665T306 10733.00000000 NS USD 270900.92000000 0.130602888551 Long EC CORP US N 1 N N N Intel Corp KNX4USFCNGPY45LOCE31 458140100 31466.00000000 NS USD 1980155.38000000 0.954644275144 Long EC CORP US N 1 N N N AutoZone Inc GA3JGKJ41LJKXDN23E90 053332102 1615.00000000 NS USD 1853793.90000000 0.893724680299 Long EC CORP US N 1 N N N Verisk Analytics Inc 549300I1YSWNIRKBWP67 92345Y106 2089.00000000 NS USD 360728.52000000 0.173909290138 Long EC CORP US N 1 N N N Incyte Corp 549300Z4WN6JVZ3T4680 45337C102 15648.00000000 NS USD 1594687.68000000 0.768808084321 Long EC CORP US N 1 N N N PepsiCo Inc FJSUNZKFNQ5YPJ5OT455 713448108 14234.00000000 NS USD 1872482.70000000 0.902734658056 Long EC CORP US N 1 N N N Graphic Packaging Holding Co N/A 388689101 29331.00000000 NS USD 424419.57000000 0.204615110941 Long EC CORP US N 1 N N N Merck & Co Inc 4YV9Y5M8S0BRK1RP0397 58933Y105 28019.00000000 NS USD 2261693.68000000 1.090375505655 Long EC CORP US N 1 N N N Allison Transmission Holdings Inc 529900RP7DJ882LI9T83 01973R101 15953.00000000 NS USD 601747.16000000 0.290105759972 Long EC CORP US N 1 N N N AMETEK Inc 549300WZDEF9KKE40E98 031100100 22050.00000000 NS USD 2022205.50000000 0.974916879371 Long EC CORP US N 1 N N N IDEXX Laboratories Inc OGMTXK0LUU1HKV2P0J84 45168D104 1043.00000000 NS USD 322161.84000000 0.155316072330 Long EC CORP US N 1 N N N Masco Corp 5GCSNMQXHEYA1JO8QN11 574599106 8821.00000000 NS USD 411499.65000000 0.198386343346 Long EC CORP US N 1 N N N Copart Inc 549300KVYX3JWMYEHU61 217204106 7569.00000000 NS USD 676592.91000000 0.326189325675 Long EC CORP US N 1 N N N Oracle Corp 1Z4GXXU7ZHVWFCD8TV52 68389X105 4840.00000000 NS USD 260246.80000000 0.125466476143 Long EC CORP US N 1 N N N Visa Inc 549300JZ4OKEHW3DPJ59 92826C839 17395.00000000 NS USD 3396199.80000000 1.637327418375 Long EC CORP US N 1 N N N 2020-06-12 MFS SERIES TRUST X Kasey Phillips Kasey Phillips Assistant Treasurer