| Masonite Corporation OH | Wholesale Trade | 7 | $103,204 | D |
| Masonite Corporation PA | Manufacturing | 0 | — | F |
| Masonite Corporation VA | Wholesale Trade | 0 | — | B |
| Masonite Corporation (Greenville) TX | — | 0 | — | — |
| Masonite Corporation Mesquite TX Plant TX | Wholesale Trade | 0 | — | A |
| Masonite Corporations SC | — | 0 | — | — |
| Masonite Door Corp. KS | Manufacturing | 0 | — | A |
| Masonite Internation LA | Wholesale Trade | 0 | — | A |
| Masonite Internation MA | Wholesale Trade | 0 | — | D |
| Masonite Internation NJ | Wholesale Trade | 0 | — | B |
| Masonite Internation PA | Wholesale Trade | 0 | — | A |
| Masonite International IN | Manufacturing | 0 | — | C |
| Masonite International MS | Manufacturing | 0 | — | C |
| Masonite International SC | Manufacturing | 0 | — | F |
| Masonite International TX | Manufacturing | 0 | — | D |
| Masonite International Corp NE | Manufacturing | 0 | — | B |
| Masonite International Corp NV | Manufacturing | 0 | — | B |
| Masonite International Corp WI | Manufacturing | 0 | — | F |
| Masonite International Corporation CA | Manufacturing | 0 | — | D |
| Masonite Kirkwood NY | Wholesale Trade | 0 | — | D |
| Masonite Wahpeton ND | Manufacturing | 0 | — | D |
| MASONOMICS, INC VA | Construction | 0 | — | B |
| Masonomics, Inc. KY | Construction | 0 | — | F |
| masonry builders inc. FL | Construction | 0 | — | F |
| Masonry Concepts, Inc. CA | Construction | 0 | — | F |
| Masonry Design, Inc. VA | Construction | 0 | — | A |
| Masonry Dixie Inc GA | Construction | 0 | — | A |
| Masonry Inc IA | Construction | 0 | — | A |
| Masonry Incorporated FL | Construction | 0 | — | C |
| MASONRY MASTERS INC VA | Construction | 0 | — | A |
| Masonry Preservation Group, Inc. NJ | Construction | 0 | — | A |
| Masonry Preservation Services, Inc. PA | Construction | 0 | — | D |
| Masonry Reinforcing Corporation of America TN | Manufacturing | 0 | — | F |
| Masonry Reinforcing Corporation of America dba Wire Bond TN | Manufacturing | 0 | — | F |
| Masonry Solutions Midwest LLC MI | Construction | 0 | — | A |
| Masonry Specialist Corporation TN | Construction | 0 | — | F |
| Masons Supply Company OR | Wholesale Trade | 0 | — | F |
| Masons Supply Company WA | Wholesale Trade | 0 | — | D |
| Maspeth Town Hall, Inc. NY | Healthcare & Social Assistance | 0 | — | C |
| Mass Audubon MA | Other Services | 0 | — | D |
| Mass Bay Electrical Corp. MA | Construction | 0 | — | B |
| Mass Cabinets Inc. MA | Manufacturing | 0 | — | A |
| MASS Design Group, Ltd. MA | Professional & Technical Services | 3 | $70,000 | — |
| Mass Electric Construction Co NE | Construction | 1 | $71,178 | — |
| Mass Excavation AK | Construction | 0 | — | A |
| Mass General Brigham NH | Healthcare & Social Assistance | 0 | — | D |
| Mass General Brigham Incorporated MA | Healthcare & Social Assistance | 8 | $102,520 | F |
| Mass General Brigham Medical Group Northern Massachusetts MA | Healthcare & Social Assistance | 3 | $220,200 | — |
| Mass Merchandising Self Selection Equipment Corp. NY | Construction | 0 | — | D |
| MASS MoCA MA | Arts & Entertainment | 0 | — | D |
