| MCMarsich Crane, INC | Billings | MT | — | ◇ UNVERIFIED |
| MCMarson Corporation | Chelsea | MA | — | ◇ UNVERIFIED |
| MEMartin Enterprises | Kennedale | TX | — | ◇ UNVERIFIED |
| MCMartinez Const & Dev CO / Hanging Lakes/ Portable | Unk | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta | Van | TX | — | ◇ UNVERIFIED |
| MMMartin Marietta Arizona, LLC - Beeline Plant | Scottsdale | AZ | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. | Severance | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. - Wilmington Concrete | Wilmington | NC | — | ◇ UNVERIFIED |
| MMMartin Marietta/portable #130 | Pine Bluff | AR | — | ◇ UNVERIFIED |
| MMMartin Marietta - Rigden Ready Mix | Fort Collins Area | CO | — | ◇ UNVERIFIED |
| MMMartin Marietta - South Santa Fe | Erie | CO | — | ◇ UNVERIFIED |
| MMMartin Materials CORP | Rochelle | IL | — | ◇ UNVERIFIED |
| MSMarzano & Sons General Engineering, INC. | Mammoth Lakes | CA | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Dewatering | Orlando | FL | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-grant Facility | Valkaria | 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 |
| MRMasseys Readi-mix Concrete Incorporated | Burlington | NC | — | ◇ UNVERIFIED |
| MBMaster Builders Solutions Admixtures US LLC | Kent | WA | — | ◇ UNVERIFIED |
| MBMaster Builders Solutions Admixtures US LLC | Longwood | FL | — | ◇ UNVERIFIED |
| MCMaster Construction Products, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MAMasterpice Artist Canvas | San Francisco | CA | — | ◇ UNVERIFIED |
| MHMasterstone Hardscapes LLC | Saint Peters | MO | — | ◇ UNVERIFIED |
| MSMaterial Sand & Stone CORP. | North Smithfield | RI | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Harrisonville | MO | — | ◇ UNVERIFIED |
| MPMaterials Packaging Corporation | Muskogee | OK | — | ◇ 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 |
| 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 |
| MIMccarthy Improvement CO | East Moline | IL | — | ◇ 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 |
| MSMcgill Septic Tank | Kinsman | OH | — | ◇ UNVERIFIED |
| MRMcGlothlin Realty | Phoenix | AZ | — | ◇ UNVERIFIED |
 Mc Industries INC Dba Kynmar Concrete | Merced | CA | — | ◇ UNVERIFIED |
| MCMckenzie Concrete Products, INC. | Fayetteville | PA | — | ◇ UNVERIFIED |
| MCMclean County Concrete CO | Bloomington | IL | — | ◇ UNVERIFIED |
| MPMcrae Precast Company | Columbus | GA | — | ◇ UNVERIFIED |
| MCMD Chemicals LLC | Mendon | MA | — | ◇ UNVERIFIED |
| MMdp | Richmond | VA | — | ◇ UNVERIFIED |
| MRMeadville Redi-mix Concrete, INC. | Meadville | PA | — | ◇ UNVERIFIED |
| MOMeans Ornamental Concrete Studio II | Olympia | WA | — | ◇ UNVERIFIED |
| MCMeba Contracting and Waste Services | Staten Island | NY | — | ◇ UNVERIFIED |
| MCMechanicsville Concrete LLC | Midlothian | VA | — | ◇ UNVERIFIED |
| MSMedina & Sons Concrete | Taos | NM | — | ◇ UNVERIFIED |
| MOMediprint Ophthalmics | San Diego | CA | — | ◇ UNVERIFIED |
| MSMedpak Solutions LLC | Saint Petersburg | FL | — | ◇ UNVERIFIED |
| MMMeeco Manufacturing Company, Inc. | Seattle | WA | — | ◇ UNVERIFIED |
| MPM.e.g.a. Precast INC. | Shelby Township | MI | — | ◇ UNVERIFIED |
| MRMeiers Ready Mix, INC. | Topeka | KS | — | ◇ UNVERIFIED |
| MCMelissa Cbp | Mckinney | TX | — | ◇ UNVERIFIED |
| MPMelissa Plant a and B | Melissa | TX | — | ◇ UNVERIFIED |
| MMMemorial Monuments | Burley | ID | — | ◇ UNVERIFIED |
| MMMemorial Monuments | City of Pocatello | ID | — | ◇ UNVERIFIED |
| MCMenahga Concrete Products INC - Nonmetallic | Menahga | MN | — | ◇ UNVERIFIED |
| MRMena Ready Mix | Mena | AR | — | ◇ UNVERIFIED |
 Merit Medical Systems, INC | San Jose | CA | — | ◇ UNVERIFIED |
| MUMerritt U-kart Concrete, INC. | Lincoln | NE | — | ◇ UNVERIFIED |
| MOMesa Oaks, LLC | Del Valle | TX | — | ◇ UNVERIFIED |
| MAMesquite Air Tanker Base | Mesquite | NV | — | ◇ UNVERIFIED |
| MCMesquite Concrete Batch Plant | Balch Springs | TX | — | ◇ UNVERIFIED |
| MTMessina Trucking, INC. | Shelby Township | MI | — | ◇ UNVERIFIED |
| MPMetals Processing, INC | Milwaukee | WI | — | ◇ UNVERIFIED |
| MCMetro Concrete LLC | Lebanon | IL | — | ◇ UNVERIFIED |
| MCMetro Concrete Products INC | South Roxana | IL | — | ◇ UNVERIFIED |
| MMMetro Materials INC | Shiloh | IL | — | ◇ UNVERIFIED |
| MMMetro Materials Inc-chesterfield | Chesterfield | MO | — | ◇ UNVERIFIED |
| MMMetro Materials Inc-st Louis City | Saint Louis | MO | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Richmond | VA | — | ◇ UNVERIFIED |
| MPMetro Pavers INC Portable | Loveland | CO | — | ◇ UNVERIFIED |
| MRMetropolis Ready Mix | Metropolis | IL | — | ◇ UNVERIFIED |
| MRMetro Ready Mix | Bakersfield | CA | — | ◇ UNVERIFIED |
| MRMetro Ready Mix | Bakersfield | CA | — | ◇ UNVERIFIED |
| MRMetro Ready Mix LLC | Lehi | UT | — | ◇ UNVERIFIED |
| MRMexia Ready Mix | Mexia | TX | — | ◇ UNVERIFIED |
| MAMexichem America INC | Tennent | NJ | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Loves Park | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Bannockburn | IL | — | ◇ UNVERIFIED |
| MMMeyer Material CO | Crystal Lake | IL | — | ◇ UNVERIFIED |
