| LSLone Star Industries Portland Cement Plant | Houston | TX | — | ◇ UNVERIFIED |
| LSLone Star Precast | Buda | TX | — | ◇ UNVERIFIED |
| LPLonestar Prestress Mfg. INC. | Conway | AR | — | ◇ UNVERIFIED |
| LWLone Wolf Enterprises-lone Wolf Enterprises | Kansas City | MO | — | ◇ UNVERIFIED |
| LPLongleaf Packaging | Holly Hill | SC | — | ◇ UNVERIFIED |
| LCLotts Concrete Products, INC. | Fort Myers | FL | — | ◇ UNVERIFIED |
| LCLudlow Companies, LLC | Nampa | ID | — | ◇ UNVERIFIED |
| MCMack Concrete Industries, INC. | Salt Springs | FL | — | ◇ UNVERIFIED |
 Mack Industries INC | White Lake | MI | — | ◇ UNVERIFIED |
| MCMacon Concrete Products INC | San Antonio | TX | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MLManafort-precision, LLC | Worcester | MA | — | ◇ UNVERIFIED |
| MBManhole Builders Incorporated | Corona | CA | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MSMarathon Staffing Services, INC. | Hudson | 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 |
| MMMartin Marietta Materials, INC | Alexandria | LA | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials Incorporated | Raleigh | NC | — | ◇ UNVERIFIED |
| MCMaryneal Cement Plant | Maryneal | TX | — | ◇ UNVERIFIED |
| MBMaster Block INC | El Mirage | AZ | — | ◇ UNVERIFIED |
| MCMaster Construction Products, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MPMasterpiece Precast INC | Haskell | NJ | — | ◇ UNVERIFIED |
| MHMasterstone Hardscapes LLC | Saint Peters | MO | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Draper | UT | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Harrisonville | MO | — | ◇ UNVERIFIED |
| MPMaterials Packaging Corporation | Muskogee | OK | — | ◇ UNVERIFIED |
| MCMcatee Construction Co- Riverside | Sterling | CO | — | ◇ UNVERIFIED |
| MVMcclain's Vault Company | Geneva | AL | — | ◇ 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 | Burley | ID | — | ◇ UNVERIFIED |
| MMMemorial Monuments | City of Pocatello | ID | — | ◇ UNVERIFIED |
| MCMershon Concrete LLC | Mansfield | NJ | — | ◇ 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 |
| 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 |
| MPMidlothian Plant | Midlothian | TX | — | ◇ UNVERIFIED |
| MPMid-state Precast | Sebring | FL | — | ◇ UNVERIFIED |
| MPMid-state Precast, L.p. | Corcoran | CA | — | ◇ UNVERIFIED |
| MCMidwest Concrete Materials - Manhattan | Manhattan | KS | — | ◇ 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 |
 Mitsubishi Cement Corporation | Long Beach | CA | — | ◇ UNVERIFIED |
| Mitsubishi Cement Corporation Cushenbury Plant | Lucerne Valley | CA | — | ◇ UNVERIFIED |
| MMMmc Material, INC | Meridian | MS | — | ◇ 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 |
| MCMonarch Cement - Barber Rd Sandstone Qr | Coyville | KS | — | ◇ UNVERIFIED |
| MCMonarch Cement - Humboldt | Humboldt | KS | — | ◇ UNVERIFIED |
| MPMonarch Precast Concrete CORP | Allentown | PA | — | ◇ UNVERIFIED |
| MPMonarch Products Company INC - Strinestown | York | PA | — | ◇ UNVERIFIED |
| MMonierlifetile | Tacoma | WA | — | ◇ UNVERIFIED |
| MLMonierlifetile L L C | Boca Raton | FL | — | ◇ UNVERIFIED |
| MLMonierlifetile L L C | Kansas City | MO | — | ◇ UNVERIFIED |
| MLMonierlifetile LLC | San Bernardino | CA | — | ◇ UNVERIFIED |
| MMMoonlight Molds, INC. | Gardena | CA | — | ◇ UNVERIFIED |
| MCMoore Construction | Dana Point | CA | — | ◇ UNVERIFIED |
| MEMotsinger Enterprises, INC. Dba Motsinger Precast | Winston Salem | NC | — | ◇ UNVERIFIED |
| MBMt Baker Silo INC | Lynden | WA | — | ◇ UNVERIFIED |
| MCMurray Concrete Batch Plant G-2 | Murray | UT | — | ◇ UNVERIFIED |
| MTMurray Terminal | Murray | UT | — | ◇ UNVERIFIED |
| MTMurrill Tank Service, INC. | Mobile | AL | — | ◇ UNVERIFIED |
| NCNational Cement Company of Alabama INC | Acworth | GA | — | ◇ UNVERIFIED |
| NCNational Cement CO of California INC | Lebec | CA | — | ◇ UNVERIFIED |
| NFNatl Fuel Gas Supply/knox Station | Brookville | PA | — | ◇ UNVERIFIED |
| NENcv Enterprises LLC | Palmetto | GA | — | ◇ UNVERIFIED |
| NPNebraska Precast, LLC | Columbus | NE | — | ◇ UNVERIFIED |
 Nelson Precast Products, LLC | Baltimore | MD | — | ◇ UNVERIFIED |
| Nelson Precast Products, LLC | Towson | MD | — | ◇ UNVERIFIED |
| NCNevada Cement Company | Sacramento | CA | — | ◇ UNVERIFIED |
| NBNew Bethlehem Burial Services, INC. | New Bethlehem | PA | — | ◇ UNVERIFIED |
| NPNewcastle Precast LLC | Portland | OR | — | ◇ UNVERIFIED |
| NSNewman & Sons INC. | Bloomington | CA | — | ◇ UNVERIFIED |
| NINicmar Industries INC Dba George R Roberts Company | Alfred | ME | — | ◇ UNVERIFIED |
