| LPLindy Paving/wheelertown Asphalt Plt | Waterford | PA | — | ◐ LIKELY ACTIVE |
| LCLinn Creek South Quarry | Linn Creek | MO | — | ◐ LIKELY ACTIVE |
| LSLithia Springs Plant 210 | Lithia Springs | GA | 20–99 | ◐ LIKELY ACTIVE |
| LRLittle Rock City Asphalt | Little Rock | AR | — | ◐ LIKELY ACTIVE |
| LOLive Oak Ready Mix, LLC | Ingleside | TX | 20–99 | ◐ LIKELY ACTIVE |
| LCLogan County Asphalt CO | Guthrie | OK | — | ◐ LIKELY ACTIVE |
| LALombard Architectural Precast Products Company | Alsip | IL | 20–99 | ◐ LIKELY ACTIVE |
| LWLone Wolf Enterprises-harrisonville | Harrisonville | MO | — | ◐ LIKELY ACTIVE |
| LRLoughman Ready Mix Plant, Maschmeyer Concrete | Davenport | FL | — | ◐ LIKELY ACTIVE |
| LPLouisville Paving CO INC | Crestwood | KY | — | ◐ LIKELY ACTIVE |
| LPLowe Precast, INC. | Waco | TX | — | ◐ LIKELY ACTIVE |
| LALP Asphalt LLC | Fort Pierce | FL | — | ◐ LIKELY ACTIVE |
| LCL.s. Construction Services (was Licausi) | Independence | MO | — | ◐ LIKELY ACTIVE |
| LILycon INC | Janesville | WI | 100–499 | ◐ LIKELY ACTIVE |
| LRLynchburg Ready-mix Concrete CO INC | Lynchburg | VA | — | ◐ LIKELY ACTIVE |
| LRLynchburg Ready Mix Concrete CO INC - Appomattox | Appomattox | VA | — | ◐ LIKELY ACTIVE |
| MCMabank Cbp No 1 | Mabank | TX | — | ◐ LIKELY ACTIVE |
Mack Industries of Bluffton | Bluffton | OH | 1–19 | ◐ LIKELY ACTIVE |
| MCMacon County Commission | Tuskegee | AL | — | ◐ LIKELY ACTIVE |
| MCMago Construction CO LLC | Bardstown | KY | 100–499 | ◐ LIKELY ACTIVE |
| MCMago Construction CO LLC - Butler Plant | Butler | KY | — | ◐ LIKELY ACTIVE |
| MCMago Construction CO LLC - Foster Plant | Foster | KY | — | ◐ LIKELY ACTIVE |
| MCMago Construction CO LLC - Irvington Hma Plant | Irvington | KY | — | ◐ LIKELY ACTIVE |
| MCMago Construction CO LLC - Lockport Hma Plant | Lockport | KY | — | ◐ LIKELY ACTIVE |
| MCMago Construction Company | Shepherdsville | KY | — | ◐ LIKELY ACTIVE |
| MCMajor Concrete 2 New Kings Road Facility | Jacksonville | FL | — | ◐ LIKELY ACTIVE |
| MAManchester Asphalt Future Development | Manchester | TN | — | ◐ LIKELY ACTIVE |
| MGMaple Grove Materials, INC. - Tiffin Plant (0374020242) | Tiffin | OH | — | ◐ LIKELY ACTIVE |
| MCMarion CO Concrete | Lebanon | KY | — | ◐ LIKELY ACTIVE |
| MMMartin Marietta/j.mill Asphalt | Malvern | AR | — | ◐ LIKELY ACTIVE |
| MMMartin Marietta Materials INC - Forks of the River | Springfield | TN | — | ◐ LIKELY ACTIVE |
| MMMartin Marietta Materials Incorporated | Monroe | NC | — | ◐ LIKELY ACTIVE |
| MMMartin Marietta Materials Incorporated | Asheboro | NC | — | ◐ LIKELY ACTIVE |
| MMMartin Marietta Mtrls - Plant 41-246098 | Golden | CO | — | ◐ LIKELY ACTIVE |
| MPMartin Paving Company, INC. | Medina | TN | — | ◐ LIKELY ACTIVE |
| MPMaryland Portable Concrete Elkton | Elkton | MD | 20–99 | ◐ LIKELY ACTIVE |
| MPMaryland Portable Concrete, INC. | Havre De Grace | MD | — | ◐ LIKELY ACTIVE |
| MZMar Zane Plant No 11 | Mantua | OH | — | ◐ LIKELY ACTIVE |
| MPMar-zane Plant No. 17 | Perrysville | OH | — | ◐ LIKELY ACTIVE |
| MCMaschmeyer Concrete/brooks Street Facility | Lakeland | FL | — | ◐ LIKELY ACTIVE |
| MCMaschmeyer Concrete-hickory Tree Rd | Saint Cloud | FL | — | ◐ LIKELY ACTIVE |
| MCMaschmeyer Concrete Rocket Blvd Facility | Orlando | FL | — | ◐ LIKELY ACTIVE |
| MBMassachusetts Broken Stone Company | Berlin | MA | — | ◐ LIKELY ACTIVE |
| MMMaster Made Tanks, Inc. | Paris | AR | 20–99 | ◐ LIKELY ACTIVE |
| MCMatthews C W Contracting CO INC | Norcross | GA | — | ◐ LIKELY ACTIVE |
| MCMatthews, C.w., Plt 14 | Smyrna | GA | — | ◐ LIKELY ACTIVE |
| MCMatthews, C.w., Plt 27 | Ball Ground | GA | — | ◐ LIKELY ACTIVE |
| MCMaury County Asphalt, INC. | Columbia | TN | — | ◐ LIKELY ACTIVE |
| MIMaymead, INC. - 115 Plant | North Wilkesboro | NC | — | ◐ LIKELY ACTIVE |
| MIMaymead, INC. - Elkin Plant | Elkin | NC | — | ◐ LIKELY ACTIVE |