| MRMasonry Reinforcing Corp of America dba Wirebond | Charlotte | NC | 100–499 | ◐ LIKELY ACTIVE |
| MHMaterial Handling Division | Nashville | TN | 100–499 | ◐ LIKELY ACTIVE |
| MNMaze Nails | Peru | IL | 20–99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Baltimore) | Baltimore | MD | 20–99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Baton Rouge, LA) | Gonzales | LA | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Carter Rd, OH) | Cleveland | OH | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Charlotte, NC) | Charlotte | NC | 20–99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Chattanooga, TN) | Chattanooga | TN | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Cincinnati, OH) | Cincinnati | OH | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Cleveland, OH) | Cleveland | OH | 100–499 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Dallas, TX) | Dallas | TX | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Denver) | Denver | CO | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Distribution Center) | Memphis | TN | 20–99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Dolomite) | Dolomite | AL | 20–99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (East Chicago, IN) | East Chicago | IN | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Granite City) | Granite City | IL | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Lafayette) | Lafayette | LA | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Longview) | Longview | TX | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Memphis) | Memphis | TN | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Oklahoma City) | Oklahoma City | OK | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Pittsburgh, PA) | Cranberry Twp | PA | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (San Antonio) | San Antonio | TX | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Vancouver) | Vancouver | WA | 1–19 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Virginia Beach, VA) | Virginia Beach | VA | 20–99 | ◐ LIKELY ACTIVE |
| MMcEwen | Mcewen | TN | 20–99 | ◐ LIKELY ACTIVE |
| MPMcEwen Plant 2 | Mcewen | TN | 20–99 | ◐ LIKELY ACTIVE |
| MMMerchants Metals (M08-Statesville) | Statesville | NC | 20–99 | ◐ LIKELY ACTIVE |
| MMMetalcraft Mining Equipment Rebuilders, Inc. | Gilboa | WV | 20–99 | ◐ LIKELY ACTIVE |
| MTMetal Textiles Corporation | Edison | NJ | 20–99 | ◐ LIKELY ACTIVE |
| MMiami | Medley | FL | 1–19 | ◐ LIKELY ACTIVE |
| MTMidland TX | Midland | TX | 1–19 | ◐ LIKELY ACTIVE |
| MLMidmark - Leesburg | Leesburg | OH | 20–99 | ◐ LIKELY ACTIVE |
| MWMidwest Wire Products, Inc. | Sturgeon Bay | WI | 20–99 | ◐ LIKELY ACTIVE |
| MMilwaukee | Greendale | WI | 20–99 | ◐ LIKELY ACTIVE |
| MEMo Enterprises | Bakersfield | CA | — | ◐ LIKELY ACTIVE |
Monroe Engineering Group LLC | North Branford | CT | 20–99 | ◐ LIKELY ACTIVE |
| MCMorgan City LA | Morgan City | LA | 20–99 | ◐ LIKELY ACTIVE |
| MUMPG US Baytown | Baytown | TX | 20–99 | ◐ LIKELY ACTIVE |
| MBMs Builders INC | Dededo | GU | — | ◐ LIKELY ACTIVE |
| NENew England Wire Products Inc - Nashua St | Leominster | MA | 1–19 | ◐ LIKELY ACTIVE |
| NENew England Wire Products - Scott Dr | Leominster | MA | 20–99 | ◐ LIKELY ACTIVE |
| NMNorris-Screens & Manufacturing | Tazewell | VA | 20–99 | ◐ LIKELY ACTIVE |
| NCNorth Carolina | Midland | NC | 1–19 | ◐ LIKELY ACTIVE |
| NMNorthridge Metal Fabrication LLC | Ludington | MI | 20–99 | ◐ LIKELY ACTIVE |
| NTNuma Tool Company | Thompson | CT | 20–99 | ◐ LIKELY ACTIVE |
| OOdessaTX | Midland | TX | 1–19 | ◐ LIKELY ACTIVE |
| OMOlney MFG 076 | Olney | IL | 20–99 | ◐ LIKELY ACTIVE |
| OPOttawa Products | Curtice | OH | 20–99 | ◐ LIKELY ACTIVE |
| PAPan American Wire INC | Fort Worth | TX | — | ◐ LIKELY ACTIVE |
| PPHX/Chandler | Chandler | AZ | 20–99 | ◐ LIKELY ACTIVE |