NPORT-P false 0000798244 XXXXXXXX S000000765 C000002221 C000002222 C000002217 C000002219 C000002215 C000002216 C000002210 C000075013 C000002211 MFS SERIES TRUST I 811-04777 0000798244 549300QRB5FQ35HH3533 111 HUNTINGTON AVENUE BOSTON 02199 617-954-5000 MFS New Discovery Fund S000000765 ZVEMRLDGMDO1D1VDSU87 2025-08-31 2025-05-31 N 2033418128.15 35293622.39 1998124505.76 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 0.00000000 N Ionis Pharmaceuticals Inc 549300SI4ZGLG0BLUZ92 462222100 351794.00000000 NS USD 11788616.94000000 0.589984102893 Long EC CORP US N 1 N N N UL Solutions Inc 549300F7CUV5ESKV9P71 903731107 115695.00000000 NS USD 8272192.50000000 0.413997850291 Long EC CORP US N 1 N N N Ligand Pharmaceuticals Inc 5493008K7TB0IKP37H79 53220K504 210832.00000000 NS USD 21544922.08000000 1.078257236618 Long EC CORP US N 1 N N N Independence Realty Trust Inc 549300Z3L8NU44NQEB29 45378A106 1297221.00000000 NS USD 24115338.39000000 1.206898685266 Long EC CORP US N 1 N N N Onestream Inc 254900CRBCHIYDC37W82 68278B107 720601.00000000 NS USD 20220064.06000000 1.011952158221 Long EC CORP US N 1 N N N AZEK Co Inc/The 5493002LDDDU1RX46815 05478C105 204692.00000000 NS USD 10134300.92000000 0.507190662583 Long EC CORP US N 1 N N N Absci Corp N/A 00091E109 1497169.00000000 NS USD 3967497.85000000 0.198561092592 Long EC CORP US N 1 N N Alkami Technology Inc 254900FCNYU4HNEV9L47 01644J108 927606.00000000 NS USD 26566635.84000000 1.329578600503 Long EC CORP US N 1 N N N Mirion Technologies Inc 549300BNTOWVWFNVTJ65 60471A101 410980.00000000 NS USD 7849718.00000000 0.392854297986 Long EC CORP US N 1 N N N P10 Inc N/A 69376K106 853310.00000000 NS USD 9266946.60000000 0.463782240460 Long EC CORP US N 1 N N N Exact Sciences Corp 549300VM3X1FYD4N9Z14 30063P105 268478.00000000 NS USD 15109941.84000000 0.756206222207 Long EC CORP US N 1 N N N BioLife Solutions Inc 549300G2IVCMC2TJDW72 09062W204 626221.00000000 NS USD 13701715.48000000 0.685728814220 Long EC CORP US N 1 N N N UFP Technologies Inc 549300RJ8LY41HS70C91 902673102 101803.00000000 NS USD 23842262.60000000 1.193232079946 Long EC CORP US N 1 N N N nVent Electric PLC N/A 000000000 591654.00000000 NS USD 38930833.20000000 1.948368737171 Long EC CORP IE N 1 N N N Permian Resources Corp 529900NXUJPOKU7OJ511 71424F105 898141.00000000 NS USD 11325558.01000000 0.566809424405 Long EC CORP US N 1 N N N ExlService Holdings Inc 81E3DTNF6OSH489ZOV15 302081104 476930.00000000 NS USD 21934010.70000000 1.097729928078 Long EC CORP US N 1 N N N JFrog Ltd N/A 000000000 724792.00000000 NS USD 31122568.48000000 1.557589048644 Long EC CORP IL N 1 N N N Ollie's Bargain Outlet Holdings Inc 529900YO5DSQCPEFDZ05 681116109 168028.00000000 NS USD 18726720.60000000 0.937214900573 Long EC CORP US N 1 N N N KBR Inc 254900OFQDXZRKRCV808 48242W106 231657.00000000 NS USD 12090178.83000000 0.605076350104 Long EC CORP US N 1 N N N iRhythm Technologies Inc 549300FJI72RJGDQS384 450056106 57282.00000000 NS USD 8048121.00000000 0.402783759310 Long EC CORP US N 1 N N N US Foods Holding Corp 549300UGOZSO64CFPR97 912008109 487453.00000000 NS USD 38567281.36000000 1.930174083187 Long EC CORP US N 1 N N N Adaptive Biotechnologies Corp 549300ZTF7OT1FW66Q96 00650F109 967435.00000000 NS USD 9209981.20000000 0.460931296996 Long EC CORP US N 1 N N N Sportradar Group AG 549300H1P33YOAT7Z533 000000000 682025.00000000 NS USD 16307217.75000000 0.816126207500 Long EC CORP CH N 1 N N N Collegium Pharmaceutical Inc 54930049FXZMTLW8D496 19459J104 538945.00000000 NS USD 15704857.30000000 0.785979915402 Long EC CORP US N 1 N N N Axalta Coating Systems Ltd 529900AGLPA40GV6H619 000000000 229494.00000000 NS USD 7068415.20000000 0.353752490379 Long EC CORP BM N 1 N N N Advanced Energy Industries Inc 549300756XI3QLFT2U27 007973100 231383.00000000 NS USD 26558140.74000000 1.329153446816 Long EC CORP US N 1 N N N Modine Manufacturing Co Z35SZFYJR8GZZRSIUU09 607828100 219580.00000000 NS USD 19937864.00000000 0.997828911187 Long EC CORP US N 1 N N N Remitly Global Inc N/A 75960P104 485342.00000000 NS USD 10366905.12000000 0.518831789015 Long EC CORP US N 1 N N N GCM Grosvenor Inc N/A 36831E108 1367850.00000000 NS USD 17248588.50000000 0.863238924815 Long EC CORP US N 1 N N N Ascendis Pharma A/S 549300B66JN3W3J8GH73 04351P101 109771.00000000 NS USD 17875109.64000000 0.894594385308 Long EC CORP DK N 1 N N N Knife River Corp N/A 498894104 340734.00000000 NS USD 32063069.40000000 1.604658233637 Long EC CORP US N 1 N N N Gerresheimer AG 5299006GD4UWSYZOKC28 000000000 187914.00000000 NS 13516797.74000000 0.676474248778 Long EC CORP DE N 1 N N N JP Morgan US Government Money Market Fund 549300NQ5E5B7ZV4T516 4812C2270 34237275.00000000 NS USD 34237275.00000000 1.713470552075 Long STIV RF US N 1 N N Terreno Realty Corp N/A 88146M101 494129.00000000 NS USD 27878758.18000000 1.395246297196 Long EC CORP US N 1 N N N QXO INC(PIPE)144APIPE PRIVATEP N/A 000000000 1260033.00000000 NS USD 21420561.00000000 1.072033346182 Long EC CORP US Y 2 N N N Ceribell Inc N/A 15678C102 376698.00000000 NS USD 6332293.38000000 0.316911852176 Long EC CORP US N 1 N N N Genius Sports Ltd N/A 000000000 3513331.00000000 NS USD 33692844.29000000 1.686223465698 Long EC CORP GG N 1 N N N Pegasystems Inc 549300FMCOKPL06FYN26 705573103 275843.00000000 NS USD 27073990.45000000 1.354970141848 Long EC CORP US N 1 N N N Chefs' Warehouse Inc/The 549300JYEDC8C547E980 163086101 304718.00000000 NS USD 19434914.04000000 0.972657809059 Long EC CORP US N 1 N N N James Hardie Industries PLC 635400NSGXKTVOO7JU45 47030M106 604647.00000000 NS USD 14088275.10000000 0.705074936991 Long EC CORP IE N 1 N N Align Technology Inc 549300N5YSE0U3LCP840 016255101 111853.00000000 NS USD 20238681.82000000 1.012883919978 Long EC CORP US N 1 N N N Standard Aero Inc N/A 85423L103 511687.00000000 NS USD 15007779.71000000 0.751093321098 Long EC CORP US N 1 N N N OPTINOSE INC 549300CPBME7Z3CYMN16 68404V118 627544.00000000 NS USD 0.00000000 0.000000 N/A DE US N 2 N/A N/A Call Purchased Optinose, Inc. Optinose, Inc. 1.00000000 1.00000000 USD 2027-11-23 XXXX -6275.44000000 N N N Viper Energy Inc 5299009LINL232255G03 927959106 282118.00000000 NS USD 11197263.42000000 0.560388673864 Long EC CORP US N 1 N N N Wingstop Inc 549300SSH3F8HPIM3Q47 974155103 95688.00000000 NS USD 32696589.60000000 1.636363975605 Long EC CORP US N 1 N N N Bloom Energy Corp 549300XB5J9BFW5JXV97 093712107 464516.00000000 NS USD 8579610.52000000 0.429383178839 Long EC CORP US N 1 N N N WisdomTree Inc 549300WIU8IS7UFO7871 97717P104 2441898.00000000 NS USD 23051517.12000000 1.153657695181 Long EC CORP US N 1 N N N ServiceTitan Inc N/A 81764X103 82369.00000000 NS USD 9115777.23000000 0.456216677375 Long EC CORP US N 1 N N Guidewire Software Inc 549300WXSG0J8IXZCK32 40171V100 77533.00000000 NS USD 16671145.66000000 0.834339682634 Long EC CORP US N 1 N N N Guardant Health Inc 254900M8C3E5VC8BR186 40131M109 206759.00000000 NS USD 8398550.58000000 0.420321684449 Long EC CORP US N 1 N N N Flowserve Corp 6Y0GK87T6V7NJKZJVM41 34354P105 694459.00000000 NS USD 34660448.69000000 1.734649096694 Long EC CORP US N 1 N N N Tempus AI Inc 2549009LA0KWRAGQBX50 88023B103 117179.00000000 NS USD 6465937.22000000 0.323600316264 Long EC CORP US N 1 N N Amentum Holdings Inc 2549009FJIBLW40CU216 023939101 4874.83000000 NS USD 100713.99000000 0.005040426145 Long EC CORP US N 1 N N N Brunswick Corp/DE YM4O38W15AX4YLLQKU27 117043109 305660.00000000 NS USD 15472509.20000000 0.774351605988 Long EC CORP US N 1 N N N PJT Partners Inc 549300W3WBEQUBKYTN87 69343T107 120154.00000000 NS USD 18102401.64000000 0.905969652432 Long EC CORP US N 1 N N N Kinaxis Inc 5299009VAZ14K7PFUQ15 49448Q109 140376.00000000 NS 19990295.25000000 1.000452934357 Long EC CORP CA N 1 N N N GeneDx Holdings Corp N/A 81663L200 139071.00000000 NS USD 9904636.62000000 0.495696669123 Long EC CORP US N 1 N N N Globus Medical Inc 5299003M2P4CIK0RF205 379577208 545313.00000000 NS USD 32271623.34000000 1.615095718358 Long EC CORP US N 1 N N N Hims & Hers Health Inc 254900V041EIVTSB6D58 433000106 113832.00000000 NS USD 6438337.92000000 0.322219055991 Long EC CORP US N 1 N N N Outset Medical Inc N/A 690145206 430594.00000000 NS USD 7565536.58000000 0.378631889964 Long EC CORP US N 1 N N N Fractyl Health Inc N/A 35168W103 639147.00000000 NS USD 1214379.30000000 0.060775957479 Long EC CORP US N 1 N N Immunocore Holdings PLC 213800IUE3DFS84BVN18 45258D105 304295.00000000 NS USD 11137197.00000000 0.557382533865 Long EC CORP GB N 1 N N N Knight-Swift Transportation Holdings Inc N/A 499049104 409211.00000000 NS USD 18136231.52000000 0.907662734114 Long EC CORP US N 1 N N N RB Global Inc 5493002H8U24DJXQ4886 74935Q107 313188.00000000 NS USD 32978696.40000000 1.650482555262 Long EC CORP CA N 1 N N N AptarGroup Inc VNPEQDQFAA7IY1T2PX43 038336103 141112.00000000 NS USD 22352140.80000000 1.118656056495 Long EC CORP US N 1 N N N Jacobs Solutions Inc N/A 46982L108 80132.00000000 NS USD 10120671.60000000 0.506508556940 Long EC CORP US N 1 N N N Oddity Tech Ltd N/A 000000000 159695.00000000 NS USD 11886098.85000000 0.594862773352 Long EC CORP IL N 1 N N N Albany International Corp L73WCPNCZIRSQGZTW097 012348108 181484.00000000 NS USD 11990647.88000000 0.600095131481 Long EC CORP US N 1 N N N Crane Co 5493000CQRQOTHUODL75 224408104 214473.00000000 NS USD 36760672.20000000 1.839758838552 Long EC CORP US N 1 N N N Littelfuse Inc 549300MY7HLQFYTPCX75 537008104 92409.00000000 NS USD 18949389.54000000 0.948358797731 Long EC CORP US N 1 N N N Blueprint Medicines Corp 5299004CC60O9T5HVM83 09627Y109 194742.00000000 NS USD 19737101.70000000 0.987781374138 Long EC CORP US N 1 N N N MFS Institutional Money Market Portfolio 5L2W638H85N8T1136O07 55291X109 68683753.77000000 NS USD 68683753.77000000 3.437411110869 Long EC RF US N 1 N N N GFL Environmental Inc 549300FYK4MBXWIVZU26 36168Q104 422148.00000000 NS USD 21288923.64000000 1.065445300261 Long EC CORP CA N 1 N N N FormFactor Inc 549300YCEEO6SZD1ZR61 346375108 709526.00000000 NS USD 21179351.10000000 1.059961530872 Long EC CORP US N 1 N N N TechnipFMC PLC 549300D5I93QWCJTCK36 000000000 600043.00000000 NS USD 18691339.45000000 0.935444182588 Long EC CORP GB N 1 N N N Kymera Therapeutics Inc N/A 501575104 305374.00000000 NS USD 9051285.36000000 0.452989057183 Long EC CORP US N 1 N N N SentinelOne Inc 984500DCD44DBF954221 81730H109 1010501.00000000 NS USD 17794922.61000000 0.890581270521 Long EC CORP US N 1 N N N Bio-Techne Corp 54930073RLKQ51TILZ35 09073M104 470221.00000000 NS USD 22758696.40000000 1.139002916704 Long EC CORP US N 1 N N N Columbia Sportswear Co 549300OTMCIEUXAH5Z60 198516106 196035.00000000 NS USD 12503112.30000000 0.625742403136 Long EC CORP US N 1 N N N CCC Intelligent Solutions Holdings Inc N/A 12510Q100 2917191.00000000 NS USD 25612936.98000000 1.281848899113 Long EC CORP US N 1 N N N QIAGEN NV 54930036WK3GMCN17Z57 000000000 687391.00000000 NS USD 31021955.83000000 1.552553694255 Long EC CORP NL N 1 N N N Etoro Group Ltd 213800XPRPJK2X5QRG86 000000000 113826.00000000 NS USD 6738499.20000000 0.337241206970 Long EC CORP VG N 1 N N N Gitlab Inc 9845004Y40FACG81ED49 37637K108 411536.00000000 NS USD 18729003.36000000 0.937329145706 Long EC CORP US N 1 N N N Elastic NV 2549003I48WHHH937I59 000000000 215225.00000000 NS USD 17405245.75000000 0.871079139454 Long EC CORP NL N 1 N N N Legend Biotech Corp 254900EIUFZTW136H859 52490G102 275333.00000000 NS USD 7970890.35000000 0.398918602270 Long EC CORP KY N 1 N N N Allegro MicroSystems Inc N/A 01749D105 398210.00000000 NS USD 10094623.50000000 0.505204929467 Long EC CORP US N 1 N N N ACV Auctions Inc N/A 00091G104 1425066.00000000 NS USD 23342581.08000000 1.168224553210 Long EC CORP US N 1 N N N Schrodinger Inc/United States 984500044BAE4791E559 80810D103 1119750.00000000 NS USD 24208995.00000000 1.211585911198 Long EC CORP US N 1 N N N Ultragenyx Pharmaceutical Inc 529900EV44GVDN1DCX77 90400D108 317856.00000000 NS USD 10816639.68000000 0.541339623673 Long EC CORP US N 1 N N N Harmony Biosciences Holdings Inc N/A 413197104 437271.00000000 NS USD 15085849.50000000 0.755000474520 Long EC CORP US N 1 N N N Neurocrine Biosciences Inc 549300FECER0XBN49756 64125C109 116640.00000000 NS USD 14349052.80000000 0.718126060645 Long EC CORP US N 1 N N N HealthEquity Inc 529900LRJU1RAFQHM467 42226A107 246915.00000000 NS USD 24842118.15000000 1.243271782032 Long EC CORP US N 1 N N N Masimo Corp 549300Q4A8JK0PIYCU29 574795100 91575.00000000 NS USD 14880937.50000000 0.744745257720 Long EC CORP US N 1 N N N XPO Inc 54930096DB9LCLPN7H13 983793100 146513.00000000 NS USD 16677574.79000000 0.834661440862 Long EC CORP US N 1 N N N CACI International Inc SYRPI2D1O9WRTS2WX210 127190304 86328.00000000 NS USD 36948384.00000000 1.849153238123 Long EC CORP US N 1 N N N Antero Resources Corp APVBKPOULHUX7YZLKU17 03674X106 301312.00000000 NS USD 11284134.40000000 0.564736299838 Long EC CORP US N 1 N N N Matador Resources Co 549300CI3Q2UUK5R4G79 576485205 270388.00000000 NS USD 11629387.88000000 0.582015177056 Long EC CORP US N 1 N N N Certara Inc N/A 15687V109 1085609.00000000 NS USD 12332518.24000000 0.617204693924 Long EC CORP US N 1 N N N QXO Inc N/A 82846H405 187223.00000000 NS USD 3182791.00000000 0.159288922728 Long EC CORP US N 1 N N N CG oncology Inc N/A 156944100 171101.00000000 NS USD 4383607.62000000 0.219386109692 Long EC CORP US N 1 N N N Lantheus Holdings Inc 5299005HUB5IOJGO7S39 516544103 202567.00000000 NS USD 15305962.52000000 0.766016455725 Long EC CORP US N 1 N N N Cytokinetics Inc 549300BE5DY1HW7IHA64 23282W605 234124.00000000 NS USD 7262526.48000000 0.363467164286 Long EC CORP US N 1 N N N TriNet Group Inc 5299003FJVBETSFKE990 896288107 183930.00000000 NS USD 15304815.30000000 0.765959040884 Long EC CORP US N 1 N N N STAG Industrial Inc 549300QWYX2W6FASVQ07 85254J102 405267.00000000 NS USD 14419399.86000000 0.721646715128 Long EC CORP US N 1 N N N Visteon Corp 549300MOVLYHRW4GGW78 92839U206 278527.00000000 NS USD 23514641.98000000 1.176835673263 Long EC CORP US N 1 N N N elf Beauty Inc 549300U2K9TCON25C029 26856L103 149386.00000000 NS USD 16804431.14000000 0.841010211904 Long EC CORP US N 1 N N N Metsera Inc N/A 59267L107 171681.00000000 NS USD 4587316.32000000 0.229581105020 Long EC CORP US N 1 N N Amicus Therapeutics Inc 549300MRD1SMUTNBPQ53 03152W109 2443065.00000000 NS USD 14829404.55000000 0.742166191708 Long EC CORP US N 1 N N N StepStone Group Inc N/A 85914M107 561990.00000000 NS USD 32511121.50000000 1.627081866334 Long EC CORP US N 1 N N N PROCEPT BioRobotics Corp N/A 74276L105 138369.00000000 NS USD 8025402.00000000 0.401646743076 Long EC CORP US N 1 N N N Q2 Holdings Inc 549300M9RKR9DZXWS696 74736L109 281024.00000000 NS USD 24595220.48000000 1.230915311288 Long EC CORP US N 1 N N N TopBuild Corp 5493007YSKHOL4RWII46 89055F103 93499.00000000 NS USD 26449932.11000000 1.323737936937 Long EC CORP US N 1 N N N DigitalBridge Group Inc 549300XG87L902AGBO89 25401T603 1448634.00000000 NS USD 16021892.04000000 0.801846531275 Long EC CORP US N 1 N N N Annexon Inc N/A 03589W102 668226.00000000 NS USD 1363181.04000000 0.068223027947 Long EC CORP US N 1 N N N Onto Innovation Inc 254900RXZVN73CHOO062 683344105 171251.00000000 NS USD 15744816.94000000 0.787979772762 Long EC CORP US N 1 N N N Corsair Gaming Inc 549300Y7YT18L8G0H525 22041X102 1363977.00000000 NS USD 11989357.83000000 0.600030568437 Long EC CORP US N 1 N N N Karman Holdings Inc N/A 485924104 257742.00000000 NS USD 11046822.12000000 0.552859548449 Long EC CORP US N 1 N N N 2025-06-27 MFS SERIES TRUST I James Byrne James Byrne Assistant Treasurer XXXX