| Mast-Lepley Silo, Inc. OH | Retail Trade | 0 | — | A |
| MasTec CO | Construction | 0 | — | A |
| MasTec MN | Construction | 0 | — | C |
| MasTec WA | Construction | 0 | — | A |
| MASTEC SERVICES COMPANY, INC FL | Construction | 14 | $99,736 | — |
| MasTec Civil LLC. FL | Construction | 0 | — | A |
| MasTec MNS Wireless FL | Construction | 0 | — | D |
| MasTec MNS Wireline FL | Construction | 0 | — | F |
| Mastec North America, Inc. CA | — | 0 | — | — |
| MasTec North America, Inc. SC | Construction | 0 | — | A |
| MasTec Renewables Puerto Rico, LLC PR | Construction | 0 | — | A |
| MasTec, Inc. WI | Construction | 0 | — | F |
| MasTec, Inc./Pumpco, Inc. TX | Construction | 0 | — | A |
| Mastech Digital Alliances, Inc. PA | Professional & Technical Services | 1 | $127,878 | — |
| Mastech Digital Solutions, Inc. PA | Professional & Technical Services | 1 | $103,418 | — |
| Mastech Digital Technologies, Inc. PA | Professional & Technical Services | 212 | $109,185 | — |
| Mastech InfoTrellis, Inc. PA | Professional & Technical Services | 2 | $112,778 | — |
| MASTEK INC TX | Professional & Technical Services | 24 | $132,927 | — |
| Master - Bilt Products MS | — | 0 | — | — |
| Master Appliance Corp. WI | Manufacturing | 0 | — | A |
| Master Association for Rancho La Quinta CA | Arts & Entertainment | 0 | — | A |
| Master Boat Builders AL | Manufacturing | 0 | — | F |
| Master Bond Inc. NJ | Manufacturing | 0 | — | A |
| Master Brand Home Products, LLC TX | — | 0 | — | — |
| MASTER BRUSH COATINGS LLC AZ | Construction | 0 | — | A |
| Master Builders Construction Solutions CA | Manufacturing | 0 | — | A |
| Master Builders Construction Systems US LLC OH | Manufacturing | 0 | — | F |
| Master Builders Solutions Construction Systems US LLC GA | Manufacturing | 0 | — | A |
| Master Builders Solutions Construction Systems US LLC MI | Manufacturing | 0 | — | F |
| Master Builders Solutions Construction Systems US LLC MN | Manufacturing | 0 | — | C |
| Master Builders Solutions Construction Systems US LLC - MBCC-Group NY | Manufacturing | 0 | — | A |
| Master Builders Solutions Construction Systems US, LLC CO | Manufacturing | 0 | — | F |
| Master Builders Solutions Construction Systems US, LLC PA | Manufacturing | 0 | — | F |
| Master Builders Solutions Construction Systems US, LLC TX | Manufacturing | 0 | — | A |
| Master Chemical Corporation OH | Manufacturing | 1 | $178,000 | C |
| Master Compliance, Inc. TX | Professional & Technical Services | 10 | $88,616 | — |
| Master Concessionair, LLC FL | — | 0 | — | — |
| Master Construction Co. Inc ND | Construction | 0 | — | F |
| Master Construction Products, Inc. FL | Retail Trade | 0 | — | B |
| Master Cooling Corporation CA | Construction | 0 | — | F |
| Master Craft Boats TN | Manufacturing | 0 | — | C |
| Master Craft Iron Co Inc CA | Construction | 0 | — | F |
| Master Drilling USA LLC TX | Mining & Extraction | 0 | — | A |
| Master Electric, Inc MI | Construction | 0 | — | A |
| MASTER ELITE SPICE INC MD | Manufacturing | 0 | — | C |
| Master Engineering Inc KY | Manufacturing | 0 | — | F |
| Master Extrusion AL | Manufacturing | 0 | — | F |
| Master Finish Company MI | Manufacturing | 0 | — | F |
| Master Forwarding Network, Inc. CA | Professional & Technical Services | 1 | $75,255 | — |
| Master Garment Cleaners PA | Other Services | 0 | — | A |
