| GSGagne & Son LLC | Belgrade | — | ● ACTIVE |
New Form Building Systems INC | Bucksport | — | ● ACTIVE |
Owen J. Folsom, INC. | Old Town | — | ● ACTIVE |
Thurston and Wong LLC | Presque Isle | — | ● ACTIVE |
| ACAmerican Concrete Industries | Veazie | 20–99 | ◐ LIKELY ACTIVE |
| SCSuperior Concrete | Auburn | 20–99 | ◐ LIKELY ACTIVE |
| CFCianbro Fabrication and Coating | Pittsfield | — | ◐ LIKELY ACTIVE |
| DPDragon Products CO - Thomaston | Thomaston | — | ◐ LIKELY ACTIVE |
| MCMga Cast Stone INC | Oxford | — | ◇ UNVERIFIED |
| FCFerraiolo Construction, INC. | Thomaston | — | ◐ LIKELY ACTIVE |
| HBHughes Bros., INC. | Hampden | 20–99 | ◐ LIKELY ACTIVE |
| MMMorningstar Marble & Granite, Inc. | Topsham | 20–99 | ◐ LIKELY ACTIVE |
| POPrecast of Maine | Topsham | 20–99 | ◐ LIKELY ACTIVE |
| SCSurface Creations of Maine LLC | Portland | 20–99 | ◐ LIKELY ACTIVE |
| WCWardwell Construction and Trucking CORP - Bucksport | Bucksport | — | ◐ LIKELY ACTIVE |
| DPDurastone Precast Incorporated-south Portland | South Portland | — | ◐ LIKELY ACTIVE |
| KRKeystone Real Estate Property LLC | Rockland | — | ◐ LIKELY ACTIVE |
| MBMorin Brick CO | Auburn | — | ◐ LIKELY ACTIVE |
| SMSargent Materials | East Machias | — | ◐ LIKELY ACTIVE |
| DPDicaperl Perlite Filter Facility | Thomaston | — | ◇ UNVERIFIED |
| GPGagne Precast Concrete Products, INC. | Veazie | — | ◇ UNVERIFIED |
| GEG. E. Goding & Son INC | Lincoln | — | ◇ UNVERIFIED |
| HCHaley Construction INC | Moosehead Junction Twp. | — | ◇ UNVERIFIED |
| HRHissong Ready-mix & Aggregates LLC - Eliot | Eliot | — | ◇ UNVERIFIED |
| LCLee's Concrete | Bangor | — | ◇ UNVERIFIED |
| LWL & W Concrete | Norridgewock | — | ◇ UNVERIFIED |
| MBMorin Brick Company | Gorham | — | ◇ UNVERIFIED |
| RAR. A. Cummings, INC. | Westbrook | — | ◇ UNVERIFIED |
| RGRichard Genest Precast Concrete | Sanford | — | ◇ UNVERIFIED |
| SSState Sand & Gravel | Belfast | — | ◇ UNVERIFIED |
| SSState Sand & Gravel INC | Belfast | — | ◇ UNVERIFIED |
| WCWardwell Construction and Trucking Corporation | Orland | — | ◇ UNVERIFIED |
| BMBOSM Monarch Mountain | Acton | 1–19 | ◐ LIKELY ACTIVE |
| GSGagne & Son Corporate | Belgrade | 20–99 | ◐ LIKELY ACTIVE |
| HCHancock Concrete Plant | Hancock | 1–19 | ◐ LIKELY ACTIVE |
| LCLee's Concrete, INC. | Millinocket | — | ◐ LIKELY ACTIVE |
| LCLincoln Concrete Plant | Lincoln | 1–19 | ◐ LIKELY ACTIVE |
| OTOld Town Concrete Plant | Old Town | 20–99 | ◐ LIKELY ACTIVE |
| SCSearsport Concrete Plant | Searsport | 1–19 | ◐ LIKELY ACTIVE |
| WGWestbrook Granite Works | Westbrook | 1–19 | ◐ LIKELY ACTIVE |
| AAroostacast | Presque Isle | — | ◇ UNVERIFIED |
| ACAuburn Concrete | Fairfield | — | ◇ UNVERIFIED |
| BRBlue Rock Industries | Westbrook | — | ◇ UNVERIFIED |
| DPDragon Products Company, INC. | Frenchville | — | ◇ UNVERIFIED |
| EPEdgecomb Potters | Edgecomb | — | ◇ UNVERIFIED |
| EAEurovia Atlantic Coast LLC | Bangor | — | ◇ UNVERIFIED |
| FSForgotten Stoneworks | Manchester | — | ◇ UNVERIFIED |
| FSFreshwater Stone and Brickwork INC | Orland | — | ◇ UNVERIFIED |
| GSGds Services INC. | Bridgton | — | ◇ UNVERIFIED |
| GCGenest Concrete | Biddeford | — | ◇ UNVERIFIED |