| LPL P Mcnear Brick CO INC | San Rafael | CA | — | ◇ UNVERIFIED |
| LCLudlow Companies, LLC | Nampa | ID | — | ◇ UNVERIFIED |
| MTMachmeyer - Tampa 36th Ave | Tampa | FL | — | ◇ UNVERIFIED |
| MCMack Concrete Industries, INC. | Salt Springs | FL | — | ◇ UNVERIFIED |
 Mack Industries INC | White Lake | MI | — | ◇ UNVERIFIED |
| MCMacon Concrete Products INC | San Antonio | TX | — | ◇ UNVERIFIED |
| MAM. A. Concrete Const- 32.5 Rd Gravel Pit | Grand Junction Area | CO | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MBManhole Builders Incorporated | Corona | CA | — | ◇ UNVERIFIED |
| MFManuel Flores Concrete Construction INC | Calexico | CA | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Hudson | NH | — | ◇ UNVERIFIED |
| MLMarcaco LLC | Albany | NY | — | ◇ UNVERIFIED |
| MCMarlette Concrete Prod INC | Marlette | MI | — | ◇ UNVERIFIED |
| MCMarshall Concrete Products INC | Hutchinson | MN | — | ◇ UNVERIFIED |
| MCMarsich Crane, INC | Billings | MT | — | ◇ UNVERIFIED |
| MEMartin Enterprises | Kennedale | TX | — | ◇ UNVERIFIED |
| MEMartin Enterprises Dba Tj Composites | Nuevo | CA | — | ◇ UNVERIFIED |
| MCMartinsburg Concrete Products | Martinsburg | WV | — | ◇ 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 |
| MCMathias Concrete - Alamosa Plant | Alamosa | CO | — | ◇ UNVERIFIED |
| MSMatt Stone CO INC | Lexington | KY | — | ◇ UNVERIFIED |
| MSMcgill Septic Tank | Kinsman | OH | — | ◇ UNVERIFIED |
| MRMcGlothlin Realty | Phoenix | AZ | — | ◇ UNVERIFIED |
| MCMckenzie Concrete Products, INC. | Fayetteville | PA | — | ◇ UNVERIFIED |
| MAMckinney Ave Plt | Houston | TX | — | ◇ UNVERIFIED |
| MCMcMaster Concrete Products of Haines City, LLC (TDN Holdings, LLC | Haines City | FL | — | ◇ 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 |
| MDMenards Distribution Center | Mckenzie | ND | — | ◇ UNVERIFIED |
| MBMeridian Brick Llc, Bessemer Plant No. 6, LLC | Bessemer | AL | — | ◇ UNVERIFIED |
| MOMesa Oaks, LLC | Del Valle | TX | — | ◇ UNVERIFIED |
| MTMessina Trucking, INC. | Shelby Township | MI | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Richmond | VA | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Charlotte | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials-catawba | Hickory | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Limited Liability Company | North Wilkesboro | NC | — | ◇ UNVERIFIED |
| MMetromont:whitehorse | Greenville | SC | — | ◇ UNVERIFIED |
| MHMichael Hogg Septic Tank | Lagrange | GA | — | ◇ UNVERIFIED |
| MPMichael Precast Concrete, INC. | Loveland | OH | — | ◇ UNVERIFIED |
| MPMichaels Precast Concrete LLC | Rhododendron | OR | — | ◇ UNVERIFIED |
