| Muscoda Protein Products LLP WI | Manufacturing | 0 | — | C |
| Muscogee Creek Nation Department of Health OK | Healthcare & Social Assistance | 0 | — | B |
| Muscolino MI | Administrative & Waste Services | 0 | — | B |
| Muscular Dystrophy Association IL | — | 0 | — | — |
| Muscular Moving Men AZ | Transportation & Warehousing | 0 | — | A |
| Muse AR | Real Estate | 0 | — | A |
| Muse Concrete Contractors Inc. CA | Construction | 0 | — | F |
| Museum Associates CA | Arts & Entertainment | 1 | $64,272 | — |
| Museum of Arts & Sciences FL | Arts & Entertainment | 0 | — | C |
| Museum of Contemporary Art IL | Arts & Entertainment | 0 | — | B |
| Museum of Contemporary Art, Los Angeles CA | — | 0 | — | — |
| Museum Of Discovery and Science FL | Arts & Entertainment | 0 | — | A |
| Museum of Fine Arts, Boston MA | Arts & Entertainment | 2 | $59,128 | — |
| Museum of Ice Cream TX | — | 0 | — | — |
| Museum of Ice Cream, Los Angeles CA | — | 0 | — | — |
| Museum of Jewish Heritage - A Living Memorial to the Holocaust NY | — | 0 | — | — |
| Museum of Pop Culture WA | — | 0 | — | — |
| Museum of Science MA | Arts & Entertainment | 0 | — | B |
| Museum of the Shenandoah Valley VA | Arts & Entertainment | 0 | — | C |
| Museum of York County SC | Arts & Entertainment | 0 | — | D |
| Museum Walk Apartments, LLC FL | — | 0 | — | — |
| Musgrove Construction, LLC FL | Construction | 0 | — | A |
| Musgrove Enterprises, LLC AZ | Manufacturing | 0 | — | A |
| Mushroom Spawning, Inc. PA | Agriculture & Forestry | 0 | — | F |
| Music City Delivery LLC TN | Transportation & Warehousing | 0 | — | F |
| Music City Fire Sprinkler, LLC TN | Construction | 0 | — | F |
| music city floors, inc. TN | Construction | 0 | — | A |
| Music City Pick-A-Part TN | Administrative & Waste Services | 0 | — | F |
| Music City Roofers, LLC TN | Construction | 0 | — | A |
| Music City Supply Chain LLC TN | Transportation & Warehousing | 0 | — | D |
| Music Mountain Water, Inc LA | Manufacturing | 0 | — | B |
| Music to Grow on, Music Therapy Services, Inc CA | Healthcare & Social Assistance | 1 | $83,200 | — |
| Musician's Friend, Inc. IN | — | 0 | — | — |
| Musician's Friend, Inc. OR | — | 0 | — | — |
| Musician's Institute International, Inc. CA | — | 0 | — | — |
| musick construction MO | Construction | 0 | — | D |
| Muska Electric MN | Construction | 0 | — | F |
| Muskego Health and Rehabilitation Center WI | Healthcare & Social Assistance | 0 | — | A |
| Muskegon Area District Library MI | Manufacturing | 0 | — | F |
| Muskegon Charter Township MI | Public Administration | 0 | — | F |
| Muskegon Correctional Facility MI | Public Administration | 0 | — | F |
| Muskegon County MI | Public Administration | 0 | — | F |
| Muskegon Public Schools MI | Public Administration | 0 | — | D |
| Muskingum Iron and Metal OH | Wholesale Trade | 0 | — | B |
| Muskingum Residentials Inc OH | Healthcare & Social Assistance | 0 | — | F |
| Muskingum University OH | Educational Services | 7 | $57,600 | — |
| MusoLingo Inc CA | Information & Media | 1 | $100,000 | — |
| Musselman Lumber - USLBM PA | Retail Trade | 0 | — | A |
| Musser Biomass and Wood Products, LLC VA | Manufacturing | 0 | — | A |
| Musser Lumber Company, Inc. VA | Wholesale Trade | 0 | — | A |
