Brookfield Industries, INC. | Thomaston | CT | Machinery Manufacturing333924 | 20-99 | ● ACTIVE |
| CSCoreslab Structures (conn), INC | Thomaston | CT | Nonmetallic Mineral Product Manufacturing327390 | 20-99 | ● ACTIVE |
Lyman Morse Boatbuilding, INC. | Thomaston | ME | Transportation Equipment Manufacturing336612 | 20-99 | ● ACTIVE |
Petit Tool Company | Thomaston | CT | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
| SCStevens CO INC | Thomaston | CT | Fabricated Metal Product Manufacturing332116 | 20-99 | ● ACTIVE |
| SEStewart Efi Ct LLC | Thomaston | CT | Fabricated Metal Product Manufacturing332119 | 20-99 | ● ACTIVE |
Summit Corporation of America | Thomaston | CT | Fabricated Metal Product Manufacturing332812 | 20-99 | ● ACTIVE |
| TCTreadwell Corporation (delaware) | Thomaston | CT | Machinery Manufacturing333998 | 20-99 | ● ACTIVE |
| USUnimetal Surface Finishing, LLC | Thomaston | CT | Fabricated Metal Product Manufacturing332813 | 20-99 | ● ACTIVE |
| CMChief Manufacturing, Inc. | Thomaston | GA | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| ESEdward Segal INC | Thomaston | CT | Machinery Manufacturing333249 | 20-99 | ▲ REPORTED CLOSED |
| LMLyman Morse Boatbuilding | Thomaston | ME | Transportation Equipment Manufacturing336612 | 20-99 | ◐ LIKELY ACTIVE |
| RCRanews Companies - Thomaston GA | Thomaston | GA | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| CUCrown USA, Inc. Thomaston | Thomaston | GA | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| TPThomaston Plant | Thomaston | GA | Chemical Manufacturing325611 | 20-99 | ◐ LIKELY ACTIVE |