| UMUnited Mat'ls Missouri River Gravel Pit | Great Falls | MT | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| UAUS Antimony CORP | Thompson Falls | MT | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| VWValley Welders Supply INC Missoula | Missoula | MT | Machinery Manufacturing333992 | — | ◇ UNVERIFIED |
| VNVitality Natural Health | Eureka | MT | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| WEWest Electronic INC | Poplar | MT | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| WWWorld Wide Press INC Print Shop | Great Falls | MT | Miscellaneous Manufacturing339932 | — | ◇ UNVERIFIED |
| 6L637 LLC | Helena | MT | Miscellaneous Manufacturing339950 | — | ◐ LIKELY ACTIVE |
| AEAcm Elite, LLC | Stevensville | MT | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| AEAdams Enterprises LLC | Roundup | MT | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| APAdvanced Products, LLC | Kalispell | MT | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| AMAic Machining LLC | Billings | MT | Printing and Related Support Activities323111 | — | ◐ LIKELY ACTIVE |
| APAJ Pasties LLC | Anaconda | MT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| ABAlpine Biologics LLC | Bozeman | MT | Miscellaneous Manufacturing339113 | — | ◐ LIKELY ACTIVE |
| ANA. N. Deringer, Inc. | Sweetgrass | MT | — | — | ◐ LIKELY ACTIVE |
| AIAp Industries, INC | Billings | MT | Fabricated Metal Product Manufacturing332216 | — | ◐ LIKELY ACTIVE |
| AArcadian | Victor | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| ASArrow Striping Equipment | Billings | MT | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| ADAsylum Distillery, INC. | Billings | MT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
Atomic Industries LLC | Billings | MT | Fabricated Metal Product Manufacturing332996 | 20-99 | ◐ LIKELY ACTIVE |
| BSBadlander Spirits | Helena | MT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BPBasin Precast, Inc. | Sidney | MT | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ◐ LIKELY ACTIVE |
| BVBearded Viking Mead Company LLC | Columbus | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BPBear Paw Meats, LLC | Chinook | MT | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| BPBeaverhead Post CO | Dillon | MT | Wood Product Manufacturing321999 | — | ◐ LIKELY ACTIVE |
| BWBee Wyld | Columbia Falls | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BBelgrade | Belgrade | MT | Fabricated Metal Product Manufacturing332322 | 1-19 | ◐ LIKELY ACTIVE |
| BCBelle Chemical | Billings | MT | Chemical Manufacturing325998 | 1-19 | ◐ LIKELY ACTIVE |
| BCBernardo Communications LLC | Eureka | MT | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| BBBernice's Bakery | Missoula | MT | Food Manufacturing311811 | 20-99 | ◐ LIKELY ACTIVE |
| BLBetterroot LLC | Florence | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BMBig Mountain Ciderworks, LLC | Kalispell | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BSBig Sky Cellars LLC | Belgrade | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BBilcp | Billings | MT | Nonmetallic Mineral Product Manufacturing327332 | 20-99 | ◐ LIKELY ACTIVE |
| BMBillings Montana Facility | Billings | MT | Food Manufacturing311313 | 100-499 | ◐ LIKELY ACTIVE |
| BRBitterroot Renaissance Cellars | Hamilton | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BTBlackhawk Tactical, LLC | Bozeman | MT | Apparel Manufacturing315990 | — | ◐ LIKELY ACTIVE |
| BDBlackpot Distillery L.l.c. | Belgrade | MT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BCBlue Creek Marbled Meat Company LLC | Billings | MT | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| BNBotanie Natural Soap Inc | Bonner | MT | Chemical Manufacturing325611 | 20-99 | ◐ LIKELY ACTIVE |
| BIBowman Industries LLC | Belgrade | MT | Primary Metal Manufacturing331221 | — | ◐ LIKELY ACTIVE |
| BOBowman Orchards | Bigfork | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BBozeman | Bozeman | MT | Apparel Manufacturing315990 | 20-99 | ◐ LIKELY ACTIVE |
| BSBozeman Spirits Distillery | Bozeman | MT | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| B1Branch 16 - Billings | Billings | MT | Fabricated Metal Product Manufacturing332323 | 1-19 | ◐ LIKELY ACTIVE |
| B1Branch 19 - Missoula | Missoula | MT | Fabricated Metal Product Manufacturing332323 | 1-19 | ◐ LIKELY ACTIVE |
| BJBrian Jones | Geraldine | MT | Fabricated Metal Product Manufacturing332994 | — | ◐ LIKELY ACTIVE |
| BIBurch Industrial Services LLC | Clancy | MT | Transportation Equipment Manufacturing336999 | — | ◐ LIKELY ACTIVE |
| BCBurgin Cellars LLC | Joliet | MT | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| CCCasino Creek Concrete INC | Lewistown | MT | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| CCC & C Meat Processing L.l.c. | Babb | MT | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |