| MHMaterial Handling Division | Nashville | TN | 100–499 | ◐ LIKELY ACTIVE |
| MSMaterial Sciences Corporation | Walbridge | OH | 20–99 | ◐ LIKELY ACTIVE |
| MSMaterial Solutions (MS) - Franklin Blvd | Eugene | OR | 100–499 | ◐ LIKELY ACTIVE |
| MAMaterion - Albuquerque (Mesa del Sol) | Albuquerque | NM | 20–99 | ◐ LIKELY ACTIVE |
| MLMaterion - Leesport | Leesport | PA | 100–499 | ◐ LIKELY ACTIVE |
| MTMathew Thomas Wilkinson | Chatsworth | CA | — | ◐ LIKELY ACTIVE |
| MCMatrix Capital LLC | Stafford | VA | — | ◐ LIKELY ACTIVE |
| MSMatthew Scott Sammons | Park Falls | WI | — | ◐ LIKELY ACTIVE |
| MWMatthew Warren, INC | Addison | IL | — | ◐ LIKELY ACTIVE |
| MSMatthias Schneider | Menomonee Falls | WI | — | ◐ LIKELY ACTIVE |
| MPMattoon Precision Manufacturing, Inc. | Mattoon | IL | 100–499 | ◐ LIKELY ACTIVE |
| MIMatzel Industries INC | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
| MPMaudlin Products | Kemah | TX | 20–99 | ◐ LIKELY ACTIVE |
| MMMaul Mfg., INC. | Santa Ana | CA | — | ◐ LIKELY ACTIVE |
| MMaxcess-Fife | Oklahoma | OK | 100–499 | ◐ LIKELY ACTIVE |
| MPMaxima Precision, INC. | Wichita | KS | — | ▲ REPORTED CLOSED |
| MIMaximum Industries, INC. | Irving | TX | — | ◐ LIKELY ACTIVE |
| MIMaximus Industries Corporation | Lafayette | IN | 20–99 | ◐ LIKELY ACTIVE |
| MPMaxpol Precision Machining, INC. | Morgan Hill | CA | — | ◐ LIKELY ACTIVE |
| MPMaysteel Porters Garland Texas | Garland | TX | 100–499 | ◐ LIKELY ACTIVE |
| MNMaze Nails | Peru | IL | 20–99 | ◐ LIKELY ACTIVE |
| MLMazontech LLC | Belen | NM | — | ◐ 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 |
| MIMbmmfg, INC | Easthampton | MA | — | ◐ LIKELY ACTIVE |
| MIM-b-w, INC. | Slinger | WI | 20–99 | ◐ LIKELY ACTIVE |
| MMMc1 Med - Medway | Medway | MA | 100–499 | ◐ LIKELY ACTIVE |
| MMMcattack Machine LLC | Willoughby | OH | — | ◐ LIKELY ACTIVE |
| MBMc Blue Space, INC. | Santa Clarita | CA | — | ◐ LIKELY ACTIVE |
| MMMcCabe's Mechanical Service, Inc. | Georgetown | DE | 20–99 | ◐ LIKELY ACTIVE |
| MIMcCloskey International Warehouse | Cudahy | WI | 20–99 | ◐ LIKELY ACTIVE |