| MSMarzano & Sons General Engineering, INC. | Mammoth Lakes | CA | — | ◇ UNVERIFIED |
| MBMaschmeyer - Brooksville | Brooksville | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Cbp - Melbourne | Melbourne | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete/brooks Street Facility | Lakeland | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Company - Apollo | Apollo Beach | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-deltona Concrete Batch Plant | Deltona | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Dewatering | Orlando | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-grant Facility | Valkaria | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-hickory Tree Rd | Saint Cloud | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete - Okeechobee Plant | Okeechobee | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Rocket Blvd Facility | Orlando | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-st Cloud | Saint Cloud | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete - Winter Beach | Winter Beach | FL | — | ◇ UNVERIFIED |
| MRMaschmeyer-daytona Rm | Daytona Beach | FL | — | ◇ UNVERIFIED |
| MRMaschmeyer-okeechobee Rm | Okeechobee | FL | — | ◇ UNVERIFIED |
| MSMaschmeyer St. Pete | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| MHMassey Holdings, LLC. | Marshall | AR | — | ◇ UNVERIFIED |
| MRMassey Ready-mix Concrete, INC. | Greensboro | NC | — | ◇ UNVERIFIED |
| MRMasseys Readi-mix Concrete Incorporated | Burlington | NC | — | ◇ UNVERIFIED |
| MCMaster Concrete Plant 5 | San Juan | PR | — | ◇ UNVERIFIED |
| MSMaterial Sand & Stone CORP. | North Smithfield | RI | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Harrisonville | MO | — | ◇ UNVERIFIED |
| MRMathews Ready Mix | Chico | CA | — | ◇ UNVERIFIED |
| MRMathews Readymix LLC | Yuba City | CA | — | ◇ UNVERIFIED |
| MRMathews Ready Mix Oroville | Oroville | CA | — | ◇ UNVERIFIED |
| MRMathews Ready Mix - Yuba City Plant | Yuba City | CA | — | ◇ UNVERIFIED |
| MCMathias Concrete INC | Monte Vista | CO | — | ◇ UNVERIFIED |
| MCMathias Concrete - South Fork | South Fork | CO | — | ◇ UNVERIFIED |
| MCMathis Concrete, LLC | Jonesville | NC | — | ◇ UNVERIFIED |
| MCMathis Concrete, Llc-roaring River | Roaring River | NC | — | ◇ UNVERIFIED |
| MOMatrix Ops INC | Hayward | CA | — | ◇ UNVERIFIED |
| MRMattoon-charleston Ready Mix | Charleston | IL | — | ◇ UNVERIFIED |
| MWMatt Waite Excavation INC (dba Kelco Concrete) | Pawlet | VT | — | ◇ UNVERIFIED |
| MCMayan Concrete INC | Matteson | IL | — | ◇ UNVERIFIED |
| MCMay Concrete & Block Products CO INC | Allen City | KY | — | ◇ UNVERIFIED |
| MCMayson Concrete | Guyton | GA | — | ◇ UNVERIFIED |
| MCMbi Construction | Effingham | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Newton | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Newton | IL | — | ◇ UNVERIFIED |
| MCMbi Construction INC | Mattoon | IL | — | ◇ UNVERIFIED |
| MCMbi Constuction INC | Xenia | IL | — | ◇ UNVERIFIED |
| MRMbi Ready Mix Llc/hansen Bros | Colfax | CA | — | ◇ UNVERIFIED |
| MBMcalester Batch Plant | Mcalester | OK | — | ◇ UNVERIFIED |
| MHMccarthy Henderson Concrete Batch Plant | Henderson | NC | — | ◇ UNVERIFIED |
| MIMccarthy Improvement CO | East Moline | IL | — | ◇ UNVERIFIED |
| MIMccarthy Improvement Co.(epd-wcd) | Vienna | GA | — | ◇ UNVERIFIED |
| MIMccarthy Improvement Company | Hoover | AL | — | ◇ UNVERIFIED |
| MIMcc, INC. | Green Bay | WI | — | ◇ UNVERIFIED |
| MAMcclellan and Mcqueen INC | Riverton | WY | — | ◇ UNVERIFIED |
| MEMcconnell Exc | Quincy | IL | — | ◇ UNVERIFIED |
| MCMccreary County Ready Mix | Whitley City | KY | — | ◇ UNVERIFIED |
| MCMcdowell Concrete Supply, LLC | Marion | NC | — | ◇ UNVERIFIED |
| MBMcgee Brothers Company Incorporated | Midland | NC | — | ◇ UNVERIFIED |
 Mc Industries INC Dba Kynmar Concrete | Merced | CA | — | ◇ UNVERIFIED |
| MCMclean County Concrete CO | Bloomington | IL | — | ◇ UNVERIFIED |
| MMMc Materials 62 - Mountain View | Mountain View | MO | — | ◇ UNVERIFIED |
| MRMeadville Redi-mix Concrete, INC. | Meadville | PA | — | ◇ UNVERIFIED |
| MRMeadville Redi Mix I/rt 322 | Meadville | PA | — | ◇ UNVERIFIED |
| MCMeba Contracting and Waste Services | Staten Island | NY | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete LLC | Midlothian | VA | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete Llc-airport Plant (portugee Road) | Sandston | VA | — | ◇ UNVERIFIED |
| MSMeeker Sand & Gravel INC | Meeker | CO | — | ◇ UNVERIFIED |
| MRMeiers Ready Mix, INC. | Topeka | KS | — | ◇ UNVERIFIED |
| MCMelissa Cbp | Mckinney | TX | — | ◇ UNVERIFIED |
| MPMelissa Plant a and B | Melissa | TX | — | ◇ UNVERIFIED |
| MCMellott Co/cedar Hill Quarry | Peach Bottom | PA | — | ◇ UNVERIFIED |
| MCMenahga Concrete Products INC - Nonmetallic | Menahga | MN | — | ◇ UNVERIFIED |
| MRMena Ready Mix | Mena | AR | — | ◇ UNVERIFIED |
| MUMerritt U-kart Concrete, INC. | Lincoln | NE | — | ◇ UNVERIFIED |
| MGMertel Gravel CO | Peru | IL | — | ◇ UNVERIFIED |
| MCMesquite Concrete Batch Plant | Balch Springs | TX | — | ◇ UNVERIFIED |
| MSMetal Services LLC | Ghent | KY | — | ◇ UNVERIFIED |
| MSMetal Services LLC (phoenix Global) | Ghent | KY | — | ◇ UNVERIFIED |
| MUMetcan USA | Adrian | MI | — | ◇ UNVERIFIED |
| MCMetro Concrete LLC | Lebanon | IL | — | ◇ UNVERIFIED |
| MCMetro Concrete LLC | Biloxi | MS | — | ◇ UNVERIFIED |
| MCMetro Concrete Products INC | South Roxana | IL | — | ◇ UNVERIFIED |
| MIMetrocon INC | Travelers Rest | SC | — | ◇ UNVERIFIED |
| MIMetrocon Inman Plant | Inman | SC | — | ◇ UNVERIFIED |
| MMMetro Materials Concrete Batch Plant | Valley Park | MO | — | ◇ UNVERIFIED |
| MMMetro Materials - Hanley Plant-kinloch | Kinloch | MO | — | ◇ UNVERIFIED |
| MMMetro Materials INC | Shiloh | IL | — | ◇ UNVERIFIED |
| MMMetro Materials Inc-chesterfield | Chesterfield | MO | — | ◇ UNVERIFIED |
| MMMetro Materials Inc-st Louis City | Saint Louis | MO | — | ◇ UNVERIFIED |
| MMMetro Materials (valley Park Plant)-fenton Supply Company | Valley Park | MO | — | ◇ UNVERIFIED |
| MMMetromont Materials | Charlotte | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation Belton | Anderson | SC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation - Concord Plt | Concord | NC | — | ◇ UNVERIFIED |
| MMMetromont Materials Corporation - Monroe Plant | Monroe | NC | — | ◇ UNVERIFIED |
| MPMetro Pavers INC Portable | Loveland | CO | — | ◇ UNVERIFIED |
| MRMetropolis Ready Mix | Metropolis | IL | — | ◇ UNVERIFIED |
| MRMetro Ready Mix | Prince George | VA | — | ◇ UNVERIFIED |
| MRMetro Ready Mix | Bakersfield | CA | — | ◇ UNVERIFIED |
| MRMetro Ready Mix | Bakersfield | CA | — | ◇ UNVERIFIED |
| MRMetro Ready Mix Concrete INC. | Nashville | TN | — | ◇ UNVERIFIED |
| MRMetro Ready Mix Concrete, INC. | Nashville | TN | — | ◇ UNVERIFIED |
| MRMetro Ready Mix LLC | Lehi | UT | — | ◇ UNVERIFIED |
| MRMetro Ready Mix & Supply Castor Ave Fac | Philadelphia | PA | — | ◇ UNVERIFIED |
| MCMeuth Concrete - Cadiz Plant | Cadiz | KY | — | ◇ UNVERIFIED |
| MCMeuth Construction Supply | Madisonville | KY | — | ◇ UNVERIFIED |
