| MIMaymead, INC. - Lenoir Plant | Lenoir | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials 421 Recycle Yard | Boone | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials (denver) | Denver | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. | Mountain City | TN | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. | Marion | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials INC - Boone | Boone | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Hildebran Plant | Hildebran | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Laurel Springs Plant | Laurel Springs | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Lenoir #2 Plant | Lenoir | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Morganton Plant | Morganton | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Statesville - North | Statesville | NC | — | ◐ LIKELY ACTIVE |
| MMMaymead Materials, INC. - Statesville Plant | Statesville | NC | — | ◐ LIKELY ACTIVE |
| MLMcasphalt, LLC | Clarksville | TN | — | ◐ LIKELY ACTIVE |
| MCMccartney Construction CO INC Speedway | Eastaboga | AL | — | ◐ LIKELY ACTIVE |
| MAMcConnell and Associates - Pevely | Pevely | MO | 1–19 | ◐ LIKELY ACTIVE |
| MPMcdiarmid Paving CO | Fayetteville | NC | — | ◐ LIKELY ACTIVE |
| MCMcgeorge Construction Co., INC. - Cranford Portable Plant | North Littl Rck | AR | — | ◐ LIKELY ACTIVE |
| MMMCIB - Midwest Block | Kansas City | MO | 1–19 | ◐ LIKELY ACTIVE |
| MMMckee Materials - Plant 2 | Wellston | OH | — | ◐ LIKELY ACTIVE |
| MDMcpherson Dept. of Public Works (asphalt Plant)(portable)(air) | Portable | KS | — | ◐ LIKELY ACTIVE |
| MCMechanicsville Concrete Llc-petersburg Plant | Petersburg | VA | — | ◐ LIKELY ACTIVE |
| MMMemorial Monuments Meridian | Meridian | ID | 20–99 | ◐ LIKELY ACTIVE |
| MIMenards INC | Plano | IL | — | ◐ LIKELY ACTIVE |
| MVMesa Verde 400 Tph Crushing Plant | Portable Source | NM | — | ◐ LIKELY ACTIVE |
| MCMesquite Concrete Cuero | Cuero | TX | 1–19 | ◐ LIKELY ACTIVE |
| MMMetro Materials INC | Atlanta | GA | — | ◐ LIKELY ACTIVE |
| MMMetromont Materials Corporation - Monroe Plant | Monroe | NC | — | ◐ LIKELY ACTIVE |
| MRMetro Ready Mix Concrete INC. | Nashville | TN | — | ◐ LIKELY ACTIVE |
| MRMetro Ready Mix & Supply Castor Ave Fac | Philadelphia | PA | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply | Henderson | KY | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply - Eddyville Plant | Eddyville | KY | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply INC - Morganfield | Morganfield | KY | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply – Owensboro Plant | Owensboro | KY | — | ◐ LIKELY ACTIVE |
| MCMeuth Construction Supply - Sebree Plant | Sebree | KY | — | ◐ LIKELY ACTIVE |
| MMMeyer Material | Mchenry | IL | — | ◐ LIKELY ACTIVE |
Meyer Utility Structures LLC | Fort Pierce | FL | — | ◐ LIKELY ACTIVE |
| MAMid America Ready Mix - Lyons Plant | Lyons | KS | — | ◐ LIKELY ACTIVE |
| MAMid Atlantic Terminals Shutdown | Chesapeake | VA | — | ◐ LIKELY ACTIVE |
| MQMiddleburgh Quarry | Schoharie | NY | — | ◐ LIKELY ACTIVE |
| MCMiddlesboro Concrete Plant | Middlesboro | KY | — | ◐ LIKELY ACTIVE |
| MCMid-illinois Concrete INC | Sullivan | IL | — | ◐ LIKELY ACTIVE |
| MMidland | Midland | TX | 20–99 | ◐ LIKELY ACTIVE |
| MCMidland Concrete Products Clear Lake | Clear Lake | IA | 20–99 | ◐ LIKELY ACTIVE |
| MTMidland Tank Farm Crude Oil Storage Facility | Midland | TX | — | ◐ LIKELY ACTIVE |
| MCMid-missouri Concrete | Montgomery City | MO | — | ◐ LIKELY ACTIVE |
| MSMid South Concrete, INC. | Pulaski | TN | — | ◐ LIKELY ACTIVE |
| MSMid - South Concrete, INC. - Leoma | Leoma | TN | — | ◐ LIKELY ACTIVE |
| MPMid-south Paving, INC | Brewton | AL | — | ◐ LIKELY ACTIVE |
| MPMid-south Paving, INC. | Childersburg | AL | — | ◐ LIKELY ACTIVE |
| MSMid State Concrete Products LLC | Santa Maria | CA | 20–99 | ◐ LIKELY ACTIVE |