| NMNitrex Metal Technologies INC | Mason | MI | Fabricated Metal Product Manufacturing332811 | — | ◐ LIKELY ACTIVE |
| ASAmerichem Sales CORP | Mason | MI | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| AEArcosa Epi LLC | Mason | MI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| DCDart Container Corporation of Michigan | Mason | MI | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP | Mason | MI | Fabricated Metal Product Manufacturing332912 | — | ◇ UNVERIFIED |
| CLClean Lites | Mason | MI | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| GMGestamp Mason | Mason | MI | Fabricated Metal Product Manufacturing332811 | 100-499 | ◐ LIKELY ACTIVE |
| DCDart Container of Michigan LLC | Mason | MI | Plastics and Rubber Products Manufacturing326140 | — | ◐ LIKELY ACTIVE |
| OOOrchid Orthopedics Solutions | Mason | MI | Miscellaneous Manufacturing339112 | — | ◐ LIKELY ACTIVE |
| RCRieth-riley Construction Co., INC. | Mason | MI | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CSCapital steel and wire, Eden rd | Mason | MI | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| CSCapital steel and wire, Hull Rd | Mason | MI | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| CWCasali Winery | Mason | MI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| DCDart Container Fiber | Mason | MI | Paper Manufacturing322219 | 20-99 | ◐ LIKELY ACTIVE |
| DCDart Container Mason MTM | Mason | MI | Machinery Manufacturing333249 | 100-499 | ◐ LIKELY ACTIVE |
| DCDTWMP Contech Engineered Solutions LLC | Mason | MI | Fabricated Metal Product Manufacturing332322 | 1-19 | ◐ LIKELY ACTIVE |
| FCFluid Connectors Mason | Mason | MI | Fabricated Metal Product Manufacturing332912 | 20-99 | ◐ LIKELY ACTIVE |
| MMMason, Mi | Mason | MI | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| MMMerindorf Meats Inc | Mason | MI | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| NMNitrex MI Operations | Mason | MI | Fabricated Metal Product Manufacturing332811 | 20-99 | ◐ LIKELY ACTIVE |
| SBStollen Berries Greenhouse and Winery LLC | Mason | MI | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MHMason Header Die | Mason | MI | Machinery Manufacturing333514 | — | ◇ UNVERIFIED |
| MPMichigan Packaging Company | Mason | MI | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| PPParker-hose Products Division | Mason | MI | Fabricated Metal Product Manufacturing332912 | — | ◇ UNVERIFIED |
| SHSsab Hardtech INC | Mason | MI | Transportation Equipment Manufacturing336370 | — | ◇ UNVERIFIED |
| TRThomas Redmar Group LLC | Mason | MI | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |