Mfs Series Trust I. Holdings as of May 31, 2026, from Form N-PORT.
Share of net assets at the report date, for the whole fund across all share classes.
| Holding | Weight | Value | Shares or units |
|---|---|---|---|
| JP Morgan US Government Money Market FundCash or money market | 4.21% | $90.19M | 90,188,868 |
| MFS Institutional Money Market Portfolio | 3.99% | $85.38M | 85,367,303 |
| Advanced Energy Industries IncAEIS | 2.34% | $50.18M | 166,070 |
| Littelfuse IncLFUS | 2.19% | $46.90M | 100,461 |
| TTM Technologies IncTTMI | 1.99% | $42.63M | 245,417 |
| Element Solutions IncESI | 1.93% | $41.30M | 973,308 |
| Ligand Pharmaceuticals IncLGND | 1.91% | $40.80M | 175,886 |
| CACI International IncCACI | 1.87% | $40.10M | 78,098 |
| Leonardo DRS IncDRS | 1.76% | $37.78M | 774,855 |
| Bloom Energy CorpBE | 1.67% | $35.83M | 125,732 |
| Bio-Techne CorpTECH | 1.64% | $35.03M | 677,854 |
| Charles River Laboratories International IncCRL | 1.56% | $33.48M | 185,265 |
| Chefs' Warehouse Inc/TheCHEF | 1.53% | $32.72M | 427,455 |
| FormFactor IncFORM | 1.50% | $32.21M | 258,502 |
| QXO IncQXO | 1.42% | $30.44M | 1,764,764 |
| Integer Holdings CorpITGR | 1.39% | $29.75M | 332,845 |
| Legence CorpLGN | 1.39% | $29.75M | 355,258 |
| Primoris Services CorpPRIM | 1.39% | $29.67M | 235,887 |
| Modine Manufacturing CoMOD | 1.34% | $28.61M | 102,578 |
| Donaldson Co IncDCI | 1.33% | $28.43M | 347,248 |
| Waystar Holding CorpWAY | 1.32% | $28.20M | 1,416,610 |
| Merit Medical Systems IncMMSI | 1.31% | $28.02M | 444,414 |
| JFrog Ltd | 1.24% | $26.56M | 334,124 |
| Terreno Realty CorpTRNO | 1.21% | $25.81M | 392,928 |
| Guardant Health IncGH | 1.20% | $25.71M | 198,239 |
| PJT Partners IncPJT | 1.18% | $25.37M | 165,957 |
| MACOM Technology Solutions Holdings IncMTSI | 1.17% | $24.99M | 68,537 |
| Flowserve CorpFLS | 1.13% | $24.22M | 320,714 |
| James Hardie Industries PLC | 1.11% | $23.78M | 1,021,281 |
| IonQ IncIONQ | 1.10% | $23.53M | 326,442 |
| Timken Co/TheTKR | 1.05% | $22.45M | 175,395 |
| Box IncBOX | 1.04% | $22.32M | 827,966 |
| Ollie's Bargain Outlet Holdings IncOLLI | 1.02% | $21.79M | 266,895 |
| Simpson Manufacturing Co IncSSD | 1.01% | $21.68M | 114,246 |
| SSR Mining IncSSRM | 1.01% | $21.67M | 694,087 |
| Digi International IncDGII | 1.00% | $21.32M | 319,218 |
| Oceaneering International IncOII | 0.99% | $21.21M | 554,753 |
| nVent Electric PLC | 0.99% | $21.16M | 126,729 |
| Birkenstock Holding Plc | 0.98% | $21.06M | 467,181 |
| BioLife Solutions Inc | 0.98% | $21.05M | 844,897 |
| TopBuild Corp | 0.97% | $20.87M | 49,995 |
| Finning International IncFINGF | 1.34% | $20.77M | 379,063 |
| Ionis Pharmaceuticals IncIONS | 0.94% | $20.09M | 262,553 |
| Knife River CorpKNF | 0.92% | $19.69M | 250,790 |
| Collegium Pharmaceutical IncCOLL | 0.92% | $19.67M | 585,155 |
| XPO IncXPO | 0.91% | $19.57M | 91,336 |
| UFP Technologies IncUFPT | 0.90% | $19.34M | 87,878 |
| MYR Group IncMYRG | 0.90% | $19.33M | 41,567 |
| Semtech CorpSMTC | 0.89% | $18.98M | 124,394 |
| Schrodinger Inc/United StatesSDGR | 0.86% | $18.45M | 1,213,659 |