| HMHeidelberg Materials Ne Llc/rich Hill Quarry | Connellsville | PA | — | ◇ UNVERIFIED |
| HMHeidelberg Materials Ne Llc/rich Hill Quarry | Connellsville | PA | — | ◇ UNVERIFIED |
| HSHeritage Slag Products, LLC (gary) | Gary | IN | — | ◇ UNVERIFIED |
| HIHolcim Incorporated | Birmingham | AL | — | ◇ UNVERIFIED |
| HIHolcim (us) INC | Weirton | WV | — | ◇ UNVERIFIED |
| IDIcmi/nukote Dunbar Plt | Connellsville | PA | — | ◇ UNVERIFIED |
| IMIdaho Minerals, L.l.c. | Malad City | ID | — | ◇ UNVERIFIED |
| IGImerys Greeneville, INC. | Greeneville | TN | — | ◇ UNVERIFIED |
| IOImerys Oilfield Solutions | Wrens | GA | — | ◇ UNVERIFIED |
| IPImerys Perlite USA | Escondido | CA | — | ◇ UNVERIFIED |
| IPImerys Perlite Usa, INC | Quincy | FL | — | ◇ UNVERIFIED |
| IPImerys Perlite Usa, INC. | Klamath Falls | OR | — | ◇ UNVERIFIED |
| IPImerys Perlite Usa, INC. | Lake Wales | FL | — | ◇ UNVERIFIED |
| ISImerys Sandersville Calcine Plant | Sandersville | GA | — | ◇ UNVERIFIED |
| IMIndustrial Minerals | Kings Creek | SC | — | ◇ UNVERIFIED |
| IMIntegrated Materials INC | San Jose | CA | — | ◇ UNVERIFIED |
| IIIsolatek International INC | San Bernardino | CA | — | ◇ UNVERIFIED |
| IMIvory Mine Project | Lovelock | NV | — | ◇ UNVERIFIED |
| JCJ Cloud INC | El Cajon | CA | — | ◇ UNVERIFIED |
| JHJm Huber Corporation | Atlanta | GA | — | ◇ UNVERIFIED |
| KMKansas Minerals | Mankato | KS | — | ◇ UNVERIFIED |
| KQKapaa Quarry Recycling INC | Kailua | HI | — | ◇ UNVERIFIED |
| KFKeystone Filler & Mfg/muncy Coal Prep Pl | Muncy | PA | — | ◇ UNVERIFIED |
| KAKincheloe and Sons | Myrtle Point | OR | — | ◇ UNVERIFIED |
| KQKutztown Quarry | Kutztown | PA | — | ◇ UNVERIFIED |
| KMKyanite Mining Corporation - Dillwyn Mullite Plant | Dillwyn | VA | — | ◇ UNVERIFIED |
| LCLafarge CORP Duquesne_plant | Pittsburgh | PA | — | ◇ UNVERIFIED |
| LNLafarge North America-mineral Solutions | Eagan | MN | — | ◇ UNVERIFIED |
| LCLaguna Clay CO | City of Industry | CA | — | ◇ UNVERIFIED |
| LMLaney Materials LLC - Laney Recycling and Aggregates | Laurel | MD | — | ◇ UNVERIFIED |
| LCLash Const. (5 S. Calle Cesar Chavez ) | Santa Barbara | CA | — | ◇ UNVERIFIED |
| LCLash Construction | Santa Barbara | CA | — | ◇ UNVERIFIED |
| LVLash/screen - Various Locations | Santa Barbara | CA | — | ◇ UNVERIFIED |
| LSLegacy Systems INC | Fremont | CA | — | ◇ UNVERIFIED |
| LCLehigh Cement CO | Woodsboro | MD | — | ◇ UNVERIFIED |
| LRLetohatchee Rail | Letohatchee | AL | — | ◇ UNVERIFIED |
| LELevy Environmental Services Company | Delta | OH | — | ◇ UNVERIFIED |
| LLLevy Lexington | Lexington | NC | — | ◇ UNVERIFIED |
| LNLhoist North America of Tn, LLC Dba Spinks Clay Company, INC. Dba Tyson Plant | Paris | TN | — | ◇ UNVERIFIED |
| LSLone Star Industries INC Dba Buzzi Unicem USA - New Orleans Cement Terminal | New Orleans | LA | — | ◇ UNVERIFIED |
| LLLwfp LLC Dba Trinity Esc | Frazier Park | CA | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials, INC. - Wilson Quarry | Wilson | NC | — | ◇ UNVERIFIED |
| MMMartin Marietta:rock Hill | Rock Hill | SC | — | ◇ UNVERIFIED |
| MCMellott Co/cedar Hill Quarry | Peach Bottom | PA | — | ◇ UNVERIFIED |
| MSMetal Services LLC | Ghent | KY | — | ◇ UNVERIFIED |
| MSMetal Services LLC (phoenix Global) | Ghent | KY | — | ◇ UNVERIFIED |
| MUMetcan USA | Adrian | MI | — | ◇ UNVERIFIED |
| MBMicro-lite - Buffalo (handling Facility) | Buffalo | KS | — | ◇ UNVERIFIED |
| MLMicro-lite, L.l.c. | Buffalo | KS | — | ◇ UNVERIFIED |
| MUMicronized Ultra Tech INC | Richmond | CA | — | ◇ UNVERIFIED |