| TTTitan Truss, LLC | Billings | MT | Wood Product Manufacturing321214 | — | ◇ UNVERIFIED |
| TSTop Shelf Cabinets, INC. | Columbia Falls | MT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| TMTreasure Mine | Dillon | MT | Nonmetallic Mineral Product Manufacturing327992 | — | ◇ UNVERIFIED |
| TTTreasure Trail Meat Processing | Glasgow | MT | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| TMTrebro Manufacturing Inc | Billings | MT | Machinery Manufacturing333111 | — | ◇ UNVERIFIED |
| TTTrevino's Tortillas Inc. | Billings | MT | Food Manufacturing311830 | — | ◇ UNVERIFIED |
| TLTripp Lumber Company INC. | Missoula | MT | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| TFTrue Focus Fabrication LLC | Missoula | MT | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
 Truenorth Steel, INC. | Missoula | MT | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| TATucker and Martin INC. | Whitefish | MT | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| UAUniversal Athletic Services, INC. | Bozeman | MT | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| UMUSA Mcdonald Corporation | Missoula | MT | Furniture and Related Product Manufacturing337211 | — | ◇ UNVERIFIED |
| UAUS Antimony CORP | Thompson Falls | MT | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| UMU.s. Minerals INC | Anaconda | MT | Nonmetallic Mineral Product Manufacturing327910 | — | ◇ UNVERIFIED |
| VMVacom Montana INC | Lewistown | MT | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| VWVolkmann Woodworking, LLC | Missoula | MT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| WSWater Science Technologies LLC - Miles City | Miles City | MT | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
 Western Emulsions Plant | Billings | MT | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| WSWestern Spindle, LLC | Townsend | MT | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| WFWest Feeds | Billings | MT | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| WIWestfeeds, INC | Great Falls | MT | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| WMWheat Montana | Three Forks | MT | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| WSWhitefish Sign Company LLC | Whitefish | MT | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| WBWhitman Boys Manufacturing, INC. | Columbia Falls | MT | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| WCWhitney Construction | Circle | MT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| WOWide Open Lapidary LLC | Glendive | MT | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| WDWillbros Downstream | Buffalo | MT | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| WCWilson Cabinetry | Billings | MT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| WHWindmill Holdings, LLC | Hamilton | MT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| WWWood Wise Custom Cabinets | Billings | MT | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| YIYellowstone Ice & Water INC. | Billings | MT | Beverage and Tobacco Product Manufacturing312113 | — | ◇ UNVERIFIED |
| YWYellowstone Wild Game Processing INC. | Bozeman | MT | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| YCYoder Cedar Works | Saint Ignatius | MT | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| ZBZ Beverage LLC | Billings | MT | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
