| KRKnife River - 777-2699 | Kalispell | MT | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| KRKnife River Billings East Site | Billings | MT | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| MMalteurop | Great Falls | MT | Food Manufacturing311213 | — | ◐ LIKELY ACTIVE |
| PCPioneer Concrete & Fuel INC | Butte | MT | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
Precision Engineering, INC. | Kalispell | MT | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| PMPyramid Mountain Lumber INC. | Seeley Lake | MT | Wood Product Manufacturing321113 | 1-19 | ◐ LIKELY ACTIVE |
| QMQuikrete - Montana Plant | Billings | MT | Nonmetallic Mineral Product Manufacturing327999 | — | ◐ LIKELY ACTIVE |
| RSRbc Sand & Gravel INC. | Darby | MT | Nonmetallic Mineral Product Manufacturing327320 | — | ◐ LIKELY ACTIVE |
| RMRocky Mountain Asphalt, LLC | Belgrade | MT | Petroleum and Coal Products Manufacturing324121 | 1-19 | ◐ LIKELY ACTIVE |
| SSSidney Sugar Facility | Sidney | MT | Food Manufacturing311311 | — | ◐ LIKELY ACTIVE |
| SPSmc Precious Metals Smelter & Base Metal Refy | Columbus | MT | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| SUSolvay USA Inc.-silver Bow Plant | Silver Bow | MT | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| SMStillwater Mining CO Smelter | Columbus | MT | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| TRTransco Railway Products | Miles City | MT | Transportation Equipment Manufacturing336510 | — | ◐ LIKELY ACTIVE |
| WMWestern Montana Orthotics & Prosthetics, P.c | Missoula | MT | Miscellaneous Manufacturing339113 | 1-19 | ◐ LIKELY ACTIVE |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |