| KCKelly's Concrete & Building Materials INC | Fremont | CA | — | ◐ LIKELY ACTIVE |
| KCKentucky Concrete INC E-town # 1 | Elizabethtown | KY | — | ◐ LIKELY ACTIVE |
| KCKentucky Concrete INC - Shelby CO Concrete INC | Shelbyville | KY | — | ◐ LIKELY ACTIVE |
| KRKern's Ready Mixed Concrete, INC. | Stillwater | OK | — | ◐ LIKELY ACTIVE |
| KRKerr's Redi Mix INC | Centre | AL | — | ◐ LIKELY ACTIVE |
| KCKienstra Concrete (missouri Bottom Rd) | Bridgeton | MO | — | ◐ LIKELY ACTIVE |
| KCKuhlman Concrete, LLC | Fort Myers | FL | — | ◐ LIKELY ACTIVE |
| KQKutztown Quarry | Kutztown | PA | — | ◐ LIKELY ACTIVE |
| LCLafarge CORP Duquesne_plant | Pittsburgh | PA | — | ◐ LIKELY ACTIVE |
| LPLafarge Powers Ready Mix | Carbondale | CO | — | ◐ LIKELY ACTIVE |
Leo O'laughlin Inc-leo O'laughlin INC | Shelbina | MO | — | ◐ LIKELY ACTIVE |
| LCLexington Concrete and Block Company, INC. | Mendenhall | MS | — | ◐ LIKELY ACTIVE |
| LCLexington Concrete and Block Company Inc, Lexington Plant | Lexington | MS | — | ◐ LIKELY ACTIVE |
| LCLexington Concrete and Block Company Inc, Pearl Plant | Pearl | MS | — | ◐ LIKELY ACTIVE |
| LRLincoln Ready Mix Concrete | Lincoln | DE | — | ◐ LIKELY ACTIVE |
| LRLoveland Ready Mix | Loveland | CO | — | ◐ LIKELY ACTIVE |
| LSLuck Stone | Burkeville | VA | — | ◐ LIKELY ACTIVE |
| LSLuck Stone - South Richmond Plant | Richmond | VA | — | ◐ LIKELY ACTIVE |
| MCMagnolia Cbp | Magnolia | TX | — | ◐ LIKELY ACTIVE |
| MRMainline Ready Mix | Fort Myers | FL | — | ◐ LIKELY ACTIVE |
| MIManatts INC | Ankeny | IA | — | ◐ LIKELY ACTIVE |
| MCMarshall Concrete | Christiansburg | VA | — | ◐ LIKELY ACTIVE |
| MCMaschmeyer Concrete - Okeechobee Plant | Okeechobee | FL | — | ◐ LIKELY ACTIVE |
| MPMetro Products & Const-robeson | Lumberton | NC | — | ◐ LIKELY ACTIVE |
| MRMetro Ready Mix | Prince George | VA | — | ◐ LIKELY ACTIVE |
| MCMeuth Concrete - Cadiz Plant | Cadiz | KY | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply | Madisonville | KY | — | ◐ LIKELY ACTIVE |
| MBMichels Batch Plant - Berthold | Berthold | ND | — | ◐ LIKELY ACTIVE |
| MLMicro-lite, L.l.c. | Buffalo | KS | — | ◐ LIKELY ACTIVE |
| MBMidwest Block & Brick-kansas City Plant | Kansas City | MO | — | ◐ LIKELY ACTIVE |
| MCMidwest Concrete Materials - Lawrence (e 23rd)(air) | Lawrence | KS | — | ◐ LIKELY ACTIVE |
| MCMidwest Concrete Materials - Plant #36 (air) | Ottawa | KS | — | ◐ LIKELY ACTIVE |
| MPMidwest Products - Hanover Plant | Hanover | KS | — | ◐ LIKELY ACTIVE |
| MPMidwest Products - Washington Plant | Washington | KS | — | ◐ LIKELY ACTIVE |
| MCMilestone Contractors, L.p. | New Haven | IN | — | ◐ LIKELY ACTIVE |
| MRMission Ready Mix - Goleta | Goleta | CA | — | ◐ LIKELY ACTIVE |
| MMMmc Materials Inc, Amory | Amory | MS | — | ◐ LIKELY ACTIVE |
| MMMmc Materials Inc, Greenwood | Greenwood | MS | — | ◐ LIKELY ACTIVE |
| MMMmc Materials Inc, Indianola | Indianola | MS | — | ◐ LIKELY ACTIVE |
| MMMmc Materials, INC. - Memphis (old US 78 Plant) | Memphis | TN | — | ◐ LIKELY ACTIVE |
| MMMmc Materials, INC. Oakland | Oakland | TN | — | ◐ LIKELY ACTIVE |
| MMMmc Materials Inc, Wiggins | Wiggins | MS | — | ◐ LIKELY ACTIVE |
| MMMmc Materials Inc, Winona | Winona | MS | — | ◐ LIKELY ACTIVE |
| MCMountain Cement CO | Denver | CO | — | ◐ LIKELY ACTIVE |
| MPMountain Park Concrete INC | Granby | CO | — | ◐ LIKELY ACTIVE |
| MHMt Holly Concrete CO | Mount Holly | NJ | — | ◐ LIKELY ACTIVE |
| MMMt. Meigs Plant | Mount Meigs | AL | — | ◐ LIKELY ACTIVE |
| NRNashville Ready Mix | Mount Juliet | TN | — | ◐ LIKELY ACTIVE |
| NRNashville Ready Mix Franklin Plant | Franklin | TN | — | ◐ LIKELY ACTIVE |
| NRNashville Ready Mix INC. | Clarksville | TN | — | ◐ LIKELY ACTIVE |