| AIAmerican Iron and Metal - Arundel | Arundel | 1–19 | ◐ LIKELY ACTIVE |
| AIAmerican Iron and Metal - Caribou | Caribou | 1–19 | ◐ LIKELY ACTIVE |
| AIAmerican Iron and Metal - Oakland | Oakland | 1–19 | ◐ LIKELY ACTIVE |
| ASAmerican Steel and Aluminum LLC | South Portland | — | ▲ REPORTED CLOSED |
| CMConfluent Medical Technologies, Windham | Windham | 20–99 | ◐ LIKELY ACTIVE |
| GDGeneral Dynamics Ordnance and Tactical Systems | Saco | 100–499 | ◐ LIKELY ACTIVE |
| KIKelco Industries | Milbridge | 20–99 | ◐ LIKELY ACTIVE |
| LELittle Enterprises North | Whitefield | 20–99 | ◐ LIKELY ACTIVE |
| LFLyman-Morse Fabrication | Thomaston | 1–19 | ◐ LIKELY ACTIVE |
| MMaine | Kingfield | 20–99 | ◐ LIKELY ACTIVE |
| PFPorvair Filtration Group - Caribou | Caribou | 20–99 | ◐ LIKELY ACTIVE |
| SFSenior Flexonics Pathway - Maine | Lewsiton | 20–99 | ◐ LIKELY ACTIVE |
| SWSmith & Wesson Houlton ME Site A | Houlton | 20–99 | ◐ LIKELY ACTIVE |
| VGVELUX Greenwood - Wells, ME | Wells | 20–99 | ◐ LIKELY ACTIVE |
| AAutotronics | Frenchville | 20–99 | ◇ UNVERIFIED |
| DMDewitt Machine & Fabrication, INC. | Medford | 1–19 | ◇ UNVERIFIED |
| EAEmerson Apparatus Company | Gorham | 1–19 | ◇ UNVERIFIED |
| FSFournier Steel Fabrication INC | West Bath | 1–19 | ◇ UNVERIFIED |
| GMGorham Machine & Fab, INC | Gorham | 1–19 | ◇ UNVERIFIED |
| HMHeli Modified, Inc. | Cornish | 1–19 | ◇ UNVERIFIED |
| LLLmc Light Iron, INC. | Limerick | 1–19 | ◇ UNVERIFIED |
| MTMaine Tool & Machine LLC | Lisbon Falls | 1–19 | ◇ UNVERIFIED |
| PIParisi, INC. | Lewiston | 1–19 | ◇ UNVERIFIED |
| QMQuality Machine Tool Inc | Wiscasset | 1–19 | ◇ UNVERIFIED |
| RSR.c. Specialty Fabrication, INC. | Lewiston | 1–19 | ◇ UNVERIFIED |
| SMScott-lynn Manufacturing INC | Auburn | 1–19 | ◇ UNVERIFIED |
| WMWestern Maine Steel Inc | West Paris | 1–19 | ◇ UNVERIFIED |
| WMWilliam M Lowe, INC. | Rockland | 1–19 | ◇ UNVERIFIED |