| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MBManhole Builders Incorporated | Corona | CA | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Hudson | NH | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MCMarlette Concrete Prod INC | Marlette | MI | — | ◇ UNVERIFIED |
| MCMarsich Crane, INC | Billings | MT | — | ◇ UNVERIFIED |
| MEMartin Enterprises | Kennedale | TX | — | ◇ UNVERIFIED |
| MEMartin Enterprises Dba Tj Composites | Nuevo | CA | — | ◇ UNVERIFIED |
| MCMaster Construction Products, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MHMasterstone Hardscapes LLC | Saint Peters | MO | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Harrisonville | MO | — | ◇ UNVERIFIED |
| MPMaterials Packaging Corporation | Muskogee | OK | — | ◇ UNVERIFIED |
| MSMcgill Septic Tank | Kinsman | OH | — | ◇ UNVERIFIED |
| MRMcGlothlin Realty | Phoenix | AZ | — | ◇ UNVERIFIED |
| MCMckenzie Concrete Products, INC. | Fayetteville | PA | — | ◇ UNVERIFIED |
| MPMcrae Precast Company | Columbus | GA | — | ◇ UNVERIFIED |
 Meadow Burke, LLC. | Tampa | FL | — | ◇ UNVERIFIED |
| MOMeans Ornamental Concrete Studio II | Olympia | WA | — | ◇ UNVERIFIED |
| MSMedina & Sons Concrete | Taos | NM | — | ◇ UNVERIFIED |
| MPM.e.g.a. Precast INC. | Shelby Township | MI | — | ◇ UNVERIFIED |
| MMMemorial Monuments | City of Pocatello | ID | — | ◇ UNVERIFIED |
| MMMemorial Monuments | Burley | ID | — | ◇ UNVERIFIED |
| MOMesa Oaks, LLC | Del Valle | TX | — | ◇ UNVERIFIED |
| MTMessina Trucking, INC. | Shelby Township | MI | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Charlotte | NC | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Richmond | VA | — | ◇ UNVERIFIED |
| MHMichael Hogg Septic Tank | Lagrange | GA | — | ◇ UNVERIFIED |
| MPMichael Precast Concrete, INC. | Loveland | OH | — | ◇ UNVERIFIED |
| MPMichaels Precast Concrete LLC | Rhododendron | OR | — | ◇ UNVERIFIED |
| MCMid-america Concrete Applications, LLC | Lees Summit | MO | — | ◇ UNVERIFIED |
| MHMid Hudson Concrete Products, INC | Hasbrouck Heights | NJ | — | ◇ UNVERIFIED |
| MPMid-state Precast | Sebring | FL | — | ◇ UNVERIFIED |
| MPMid-state Precast, L.p. | Corcoran | CA | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing | Pioneer | OH | — | ◇ UNVERIFIED |
| MPMidwest Product Group | Shawnee | KS | — | ◇ UNVERIFIED |
| MEMillard Enterprises, LLC | East Syracuse | NY | — | ◇ UNVERIFIED |
| MLMiller & Long Construction INC | Mc Lean | VA | — | ◇ UNVERIFIED |
| MPMiller-mize Precast INC. | Columbus | GA | — | ◇ UNVERIFIED |
| MWMillstone Weber - Port Batch Plant #7001 | Saint Charles | MO | — | ◇ UNVERIFIED |
| MPMineral Processing Specialties Inc. | Springdale | PA | — | ◇ UNVERIFIED |
| MIMinnick Illinois LLC | Joliet | IL | — | ◇ UNVERIFIED |
| MMMinnick Midwest LLC Dba Midwest Tile & Concrete Products | Woodburn | IN | — | ◇ UNVERIFIED |
| MWMissouri Wilbert Vault CO. INC. | Moberly | MO | — | ◇ UNVERIFIED |
| MCMitchell Concrete Pipe CO. INC. | Saginaw | AL | — | ◇ UNVERIFIED |
| MMM & M Precast INC | North East | MD | — | ◇ UNVERIFIED |
| MCMoca Concrete Poles INC. | Moca | PR | — | ◇ UNVERIFIED |
| MCMolin Concrete Products CO | Lino Lakes | MN | — | ◇ UNVERIFIED |
| MCMolin Concrete Products Company | Anoka | MN | — | ◇ UNVERIFIED |
| MPMonarch Precast Concrete CORP | Allentown | PA | — | ◇ UNVERIFIED |
| MPMonarch Products Company INC - Strinestown | York | PA | — | ◇ UNVERIFIED |
