NPORT-P false 0000918571 XXXXXXXX S000002678 C000007326 C000007327 MFS VARIABLE INSURANCE TRUST 811-08326 0000918571 4GB90YGNINHU70MFQX13 111 HUNTINGTON AVENUE BOSTON 02199 617-954-5000 MFS Mid Cap Growth Series S000002678 DQS0BFT7TBCF2MYV2M94 2025-12-31 2025-03-31 N 327084105.41 861567.28 326222538.13 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 20.49000000 N EPAM Systems Inc 549300XCR4R530HJP604 29414B104 2859.00000000 NS USD 482713.56000000 0.147970634637 Long EC CORP US N 1 N N N AZEK Co Inc/The 5493002LDDDU1RX46815 05478C105 90815.00000000 NS USD 4439945.35000000 1.361017351974 Long EC CORP US N 1 N N N Hyatt Hotels Corp T27JQIMTYSH41TCD5186 448579102 32315.00000000 NS USD 3958587.50000000 1.213462295613 Long EC CORP US N 1 N N N AMETEK Inc 549300WZDEF9KKE40E98 031100100 24051.00000000 NS USD 4140139.14000000 1.269114992401 Long EC CORP US N 1 N N N Vistra Corp 549300KP43CPCUJOOG15 92840M102 33637.00000000 NS USD 3950329.28000000 1.210930827356 Long EC CORP US N 1 N N N MSCI Inc 549300HTIN2PD78UB763 55354G100 10422.00000000 NS USD 5893641.00000000 1.806632072015 Long EC CORP US N 1 N N N Chipotle Mexican Grill Inc N/A 169656105 53401.00000000 NS USD 2681264.21000000 0.821912619946 Long EC CORP US N 1 N N N Evercore Inc 529900P6KLPT95DW3W58 29977A105 3570.00000000 NS USD 713000.40000000 0.218562581263 Long EC CORP US N 1 N N N Okta Inc 549300N8J06I8MRHU620 679295105 34737.00000000 NS USD 3655027.14000000 1.120409141855 Long EC CORP US N 1 N N N Tractor Supply Co 549300OJ9VZHZRO6I137 892356106 43511.00000000 NS USD 2397456.10000000 0.734914305352 Long EC CORP US N 1 N N N Tradeweb Markets Inc N/A 892672106 20585.00000000 NS USD 3056049.10000000 0.936798885055 Long EC CORP US N 1 N N N Expedia Group Inc N/A 30212P303 2720.00000000 NS USD 457232.00000000 0.140159537296 Long EC CORP US N 1 N N N Cloudflare Inc 5493007DY18BGNLDWU14 18915M107 5699.00000000 NS USD 642220.31000000 0.196865708200 Long EC CORP US N 1 N N N Constellation Software Inc/Canada 549300B6PYHMCTDWQV29 21037X100 1986.00000000 NS 6289522.13000000 1.927985161924 Long EC CORP CA N 1 N N N Agilent Technologies Inc QUIX8Y7A2WP0XRMW7G29 00846U101 25374.00000000 NS USD 2968250.52000000 0.909885177466 Long EC CORP US N 1 N N N Aramark 549300MR6PG2DWZUIL39 03852U106 64315.00000000 NS USD 2220153.80000000 0.680564197902 Long EC CORP US N 1 N N N Burlington Stores Inc 5299003Z37DVGKKC1W09 122017106 15956.00000000 NS USD 3802793.48000000 1.165705319380 Long EC CORP US N 1 N N N HubSpot Inc 529900BLNVEW0MVKJB37 443573100 9650.00000000 NS USD 5512948.50000000 1.689934892788 Long EC CORP US N 1 N N N Spotify Technology SA 549300B4X0JHWV0DTD60 000000000 18395.00000000 NS USD 10117801.85000000 3.101503013249 Long EC CORP LU N 1 N N N Robinhood Markets Inc 213800FS5AO3YWIE6F63 770700102 39192.00000000 NS USD 1631171.04000000 0.500017886363 Long EC CORP US N 1 N N N Cheniere Energy Inc MIHC87W9WTYSYZWV1J40 16411R208 27881.00000000 NS USD 6451663.40000000 1.977687819174 Long EC CORP US N 1 N N N BILL Holdings Inc 549300IBF9VZZIGOZW63 090043100 10214.00000000 NS USD 468720.46000000 0.143681200779 Long EC CORP US N 1 N N N Vulcan Materials Co 549300Q8LSNHAVWBNI21 929160109 19518.00000000 NS USD 4553549.40000000 1.395841448019 Long EC CORP US N 1 N N N Manhattan Associates Inc 529900Q1GJP7KD52SW51 562750109 6404.00000000 NS USD 1108148.16000000 0.339690864509 Long EC CORP US N 1 N N N Carlyle Group Inc/The 529900NGGVF94UK6PG95 14316J108 75703.00000000 NS USD 3299893.77000000 1.011546838215 Long EC CORP US N 1 N N N Ascendis Pharma A/S 549300B66JN3W3J8GH73 04351P101 30497.00000000 NS USD 4753262.42000000 1.457061319934 Long EC CORP DK N 1 N N N CONSTELLATION SOFTWARE INC 549300B6PYHMCTDWQV29 000000000 2984.00000000 NS 0.00000000 0.000000 N/A DE CA N 2 N/A N/A Call Purchased Constellation Software, Inc. Constellation Software, Inc. 1.00000000 1.00000000 CAD 2040-03-31 XXXX 0.00000000 N N N CBRE Group Inc 52990016II9MJ2OSWA10 12504L109 35537.00000000 NS USD 4647528.86000000 1.424649837696 Long EC CORP US N 1 N N N Block Inc 549300OHIIUWSTIZME52 852234103 53034.00000000 NS USD 2881337.22000000 0.883242842912 Long EC CORP US N 1 N N N TKO Group Holdings Inc N/A 87256C101 33573.00000000 NS USD 5130290.13000000 1.572635097319 Long EC CORP US N 1 N N N JP Morgan US Government Money Market Fund 549300NQ5E5B7ZV4T516 4812C2270 780360.00000000 NS USD 780360.00000000 0.239210940014 Long STIV RF US N 1 N N BJ's Wholesale Club Holdings Inc 549300UCIWH1C93V0J03 05550J101 21142.00000000 NS USD 2412302.20000000 0.739465217157 Long EC CORP US N 1 N N N Pegasystems Inc 549300FMCOKPL06FYN26 705573103 13873.00000000 NS USD 964450.96000000 0.295642037956 Long EC CORP US N 1 N N N CDW Corp/DE 9845001B052ABF0B6755 12514G108 2378.00000000 NS USD 381098.28000000 0.116821566708 Long EC CORP US N 1 N N N Tyler Technologies Inc 25490040SMU4Z8LBCW70 902252105 12987.00000000 NS USD 7550511.93000000 2.314527982426 Long EC CORP US N 1 N N N Vertiv Holdings Co 549300KTTIRAOGXCRV69 92537N108 24276.00000000 NS USD 1752727.20000000 0.537279615947 Long EC CORP US N 1 N N N Veeva Systems Inc 549300YZEXPDB92M2F02 922475108 20967.00000000 NS USD 4856586.21000000 1.488734113172 Long EC CORP US N 1 N N N Axon Enterprise Inc 549300QP2IEEGFE16681 05464C101 9537.00000000 NS USD 5015985.15000000 1.537596138744 Long EC CORP US N 1 N N N Coupang Inc 549300XR4L1D80AK4W76 22266T109 154798.00000000 NS USD 3394720.14000000 1.040614839017 Long EC CORP US N 1 N N N Wingstop Inc 549300SSH3F8HPIM3Q47 974155103 5144.00000000 NS USD 1160383.52000000 0.355703050638 Long EC CORP US N 1 N N N Sweetgreen Inc N/A 87043Q108 44747.00000000 NS USD 1119569.94000000 0.343192087958 Long EC CORP US N 1 N N N Take-Two Interactive Software Inc BOMSTHHJK882EWYX3334 874054109 48098.00000000 NS USD 9968310.50000000 3.055678052516 Long EC CORP US N 1 N N N Saia Inc 549300WNPG4N9GBOYB29 78709Y105 1210.00000000 NS USD 422810.30000000 0.129607936479 Long EC CORP US N 1 N N N Hubbell Inc 54930088VDQ6840Y6597 443510607 4990.00000000 NS USD 1651240.90000000 0.506170085447 Long EC CORP US N 1 N N N O'Reilly Automotive Inc 549300K2RLMQL149Q332 67103H107 3417.00000000 NS USD 4895125.86000000 1.500548027141 Long EC CORP US N 1 N N N Quanta Services Inc SHVRXXEACT60MMH07S24 74762E102 9127.00000000 NS USD 2319900.86000000 0.711140583142 Long EC CORP US N 1 N N N Gartner Inc PP55B5R38BFB8O8HH686 366651107 7766.00000000 NS USD 3259700.84000000 0.999226129097 Long EC CORP US N 1 N N N ServiceTitan Inc N/A 81764X103 6511.00000000 NS USD 619261.21000000 0.189827843762 Long EC CORP US N 1 N N Ares Management Corp 529900JUV61FH7B8VW38 03990B101 33905.00000000 NS USD 4970812.05000000 1.523748812235 Long EC CORP US N 1 N N N TransUnion 549300ZS772LUNUMRB03 89400J107 66768.00000000 NS USD 5541076.32000000 1.698557172586 Long EC CORP US N 1 N N N Guidewire Software Inc 549300WXSG0J8IXZCK32 40171V100 47574.00000000 NS USD 8913464.64000000 2.732326433082 Long EC CORP US N 1 N N N Wolters Kluwer NV 724500TEM53I0U077B74 000000000 27554.00000000 NS 4276947.56000000 1.311052137757 Long EC CORP NL N 1 N N N Tempus AI Inc N/A 88023B103 5365.00000000 NS USD 258807.60000000 0.079334677942 Long EC CORP US N 1 N N CoStar Group Inc 984500Q1D53D08E2E698 22160N109 54999.00000000 NS USD 4357570.77000000 1.335766313075 Long EC CORP US N 1 N N N TransDigm Group Inc N/A 893641100 856.00000000 NS USD 1184096.24000000 0.362971929158 Long EC CORP US N 1 N N N Cadence Design Systems Inc GCT7RXJOGLXPV0NXZY22 127387108 12735.00000000 NS USD 3238892.55000000 0.992847572263 Long EC CORP US N 1 N N N Cameco Corp N4BHALMXL3GMZKCUON55 13321L108 33855.00000000 NS USD 1393471.80000000 0.427153748477 Long EC CORP CA N 1 N N N Bright Horizons Family Solutions Inc N/A 109194100 42706.00000000 NS USD 5425370.24000000 1.663088721919 Long EC CORP US N 1 N N N Oddity Tech Ltd N/A 000000000 22935.00000000 NS USD 992168.10000000 0.304138428229 Long EC CORP IL N 1 N N N MFS Institutional Money Market Portfolio 5L2W638H85N8T1136O07 55291X109 6380161.50000000 NS USD 6380799.51000000 1.955965258126 Long EC RF US N 1 N N N GFL Environmental Inc 549300FYK4MBXWIVZU26 36168Q104 71580.00000000 NS USD 3458029.80000000 1.060021732349 Long EC CORP CA N 1 N N N ServiceNow Inc 549300HJTQM36M0E1G39 81762P102 3667.00000000 NS USD 2919445.38000000 0.894924488275 Long EC CORP US N 1 N N N Melrose Industries PLC 213800RGNXXZY2M7TR85 000000000 147983.00000000 NS 912002.90000000 0.279564650936 Long EC CORP GB N 2 N N N DraftKings Inc 2549006G33IUL6IVOD83 26142V105 119367.00000000 NS USD 3964178.07000000 1.215176024539 Long EC CORP US N 1 N N N SentinelOne Inc 984500DCD44DBF954221 81730H109 24369.00000000 NS USD 443028.42000000 0.135805583065 Long EC CORP US N 1 N N N Dexcom Inc 549300YSK3QDSFR5EU59 252131107 51724.00000000 NS USD 3532231.96000000 1.082767604055 Long EC CORP US N 1 N N N Bio-Techne Corp 54930073RLKQ51TILZ35 09073M104 32874.00000000 NS USD 1927402.62000000 0.590824481670 Long EC CORP US N 1 N N N Elastic NV 2549003I48WHHH937I59 000000000 20796.00000000 NS USD 1852923.60000000 0.567993741518 Long EC CORP NL N 1 N N N Legend Biotech Corp 254900EIUFZTW136H859 52490G102 37216.00000000 NS USD 1262738.88000000 0.387078982107 Long EC CORP KY N 1 N N N ACV Auctions Inc N/A 00091G104 123462.00000000 NS USD 1739579.58000000 0.533249354864 Long EC CORP US N 1 N N N LPL Financial Holdings Inc 549300XROQ4Y8G2L7682 50212V100 20444.00000000 NS USD 6688050.16000000 2.050149630475 Long EC CORP US N 1 N N N Live Nation Entertainment Inc 5493007B9BM9ZXJINO78 538034109 48325.00000000 NS USD 6310278.50000000 1.934347803242 Long EC CORP US N 1 N N N Datadog Inc 549300F6JNO0KRPO1K63 23804L103 38363.00000000 NS USD 3805993.23000000 1.166686168226 Long EC CORP US N 1 N N N PTC Inc 54930050SSMU8SKDJ030 69370C100 15416.00000000 NS USD 2388709.20000000 0.732233037512 Long EC CORP US N 1 N N N Monolithic Power Systems Inc 529900TB7O85LSZ1XU31 609839105 6685.00000000 NS USD 3877166.30000000 1.188503505068 Long EC CORP US N 1 N N N Natera Inc N/A 632307104 38467.00000000 NS USD 5439618.47000000 1.667456363126 Long EC CORP US N 1 N N N Masimo Corp 549300Q4A8JK0PIYCU29 574795100 34309.00000000 NS USD 5715879.40000000 1.752141171105 Long EC CORP US N 1 N N N Copart Inc 549300KVYX3JWMYEHU61 217204106 84577.00000000 NS USD 4786212.43000000 1.467161790057 Long EC CORP US N 1 N N N Verisk Analytics Inc 549300I1YSWNIRKBWP67 92345Y106 28024.00000000 NS USD 8340502.88000000 2.556691186271 Long EC CORP US N 1 N N N ROBLOX Corp N/A 771049103 52187.00000000 NS USD 3041980.23000000 0.932486224721 Long EC CORP US N 1 N N N Church & Dwight Co Inc POOXSI30AWAQGYJZC921 171340102 15919.00000000 NS USD 1752522.71000000 0.537216931744 Long EC CORP US N 1 N N N Howmet Aerospace Inc 549300HO5WFZUT5N2T22 443201108 95260.00000000 NS USD 12358079.80000000 3.788236052248 Long EC CORP US N 1 N N N Nasdaq Inc 549300L8X1Q78ERXFD06 631103108 22145.00000000 NS USD 1679919.70000000 0.514961262219 Long EC CORP US N 1 N N N Hexcel Corp S6Q7LW43WUBUHXY2QP69 428291108 24063.00000000 NS USD 1317689.88000000 0.403923618384 Long EC CORP US N 1 N N N TPG Inc 549300NLO4R8MX77XJ02 872657101 59415.00000000 NS USD 2818053.45000000 0.863843885880 Long EC CORP US N 1 N N N VF Corp CWAJJ9DJ5Z7P057HV541 918204108 55777.00000000 NS USD 865659.04000000 0.265358440579 Long EC CORP US N 1 N N N Expand Energy Corp X2MT1W32SPAZ9WSKLE78 165167735 42976.00000000 NS USD 4784088.32000000 1.466510667050 Long EC CORP US N 1 N N N STERIS PLC N/A 000000000 13204.00000000 NS USD 2992686.60000000 0.917375794190 Long EC CORP IE N 1 N N N Morningstar Inc 529900YGNQPOVAXQ7F29 617700109 14930.00000000 NS USD 4477059.10000000 1.372394171679 Long EC CORP US N 1 N N N Waters Corp 5T547R1474YC9HOD8Q74 941848103 8060.00000000 NS USD 2970674.20000000 0.910628130425 Long EC CORP US N 1 N N N Arthur J Gallagher & Co 54930049QLLMPART6V29 363576109 21869.00000000 NS USD 7550053.56000000 2.314387474047 Long EC CORP US N 1 N N N Westinghouse Air Brake Technologies Corp 06BTX5UWZD0GQ5N5Y745 929740108 36241.00000000 NS USD 6572305.35000000 2.014669307545 Long EC CORP US N 1 N N N Q2 Holdings Inc 549300M9RKR9DZXWS696 74736L109 22499.00000000 NS USD 1800144.99000000 0.551815027961 Long EC CORP US N 1 N N N Floor & Decor Holdings Inc 549300M5FR3N688XGQ36 339750101 10641.00000000 NS USD 856281.27000000 0.262483786346 Long EC CORP US N 1 N N N 2025-04-30 MFS VARIABLE INSURANCE TRUST James Byrne James Byrne Assistant Treasurer XXXX