| Mount Hope Dairy MI | Agriculture & Forestry | 0 | — | F |
| Mount Joy Farmers Co-op Assoc. PA | Transportation & Warehousing | 0 | — | B |
| Mount Kisco Medical Group PC (MKMG) NY | — | 0 | — | — |
| Mount Laurel Center NJ | — | 0 | — | — |
| Mount Laurel Veterinary Services, LLC. NJ | Professional & Technical Services | 0 | — | F |
| Mount Lemon Healthcare AZ | Healthcare & Social Assistance | 0 | — | F |
| Mount Macrina Manor Nursing Home PA | Healthcare & Social Assistance | 0 | — | F |
| Mount Materials PA | Construction | 0 | — | F |
| Mount Nittany Medical Center PA | Healthcare & Social Assistance | 0 | — | F |
| Mount Notre Dame Health Center OH | Healthcare & Social Assistance | 0 | — | A |
| MOUNT PLEASANT SC | Healthcare & Social Assistance | 0 | — | F |
| Mount Pleasant II Enterprises LLC TX | Healthcare & Social Assistance | 0 | — | A |
| Mount Pleasant Waterworks SC | Utilities | 0 | — | F |
| Mount Prospect Academy MA | Healthcare & Social Assistance | 0 | — | F |
| Mount Prospect Academy - Hampton NH | Healthcare & Social Assistance | 0 | — | F |
| Mount Prospect Academy Inc. NH | Healthcare & Social Assistance | 2 | $47,500 | F |
| MOUNT PROSPECT PARK DISTRICT - J640001 IL | Arts & Entertainment | 0 | — | B |
| Mount Rogers Community Services VA | Healthcare & Social Assistance | 1 | $72,420 | B |
| Mount Rogers Industrial and Development Center VA | Healthcare & Social Assistance | 0 | — | A |
| Mount Royal Operations LLC AL | Healthcare & Social Assistance | 0 | — | F |
| Mount Saint Joseph Rehab Center OH | Healthcare & Social Assistance | 0 | — | F |
| Mount Saint Mary College NY | Educational Services | 0 | — | D |
| Mount Saint Vincent Care Center of Holyoke MA | — | 0 | — | — |
| Mount Savage Specialty Refractories MD | Manufacturing | 0 | — | A |
| Mount Sinai NY | Healthcare & Social Assistance | 0 | — | F |
| Mount Sinai Brooklyn NY | Healthcare & Social Assistance | 0 | — | F |
| Mount Sinai Hospital NY | Healthcare & Social Assistance | 39 | $139,627 | — |
| Mount Sinai Medical Center of Florida FL | Healthcare & Social Assistance | 8 | $258,350 | — |
| Mount Sinai South Nassau NY | Healthcare & Social Assistance | 0 | — | F |
| Mount Sinai Union Square NY | Healthcare & Social Assistance | 0 | — | D |
| Mount St. Joseph-St. Elizabeth dba Epiphany Center CA | Healthcare & Social Assistance | 0 | — | F |
| Mount St. Mary's University MD | Educational Services | 2 | $63,500 | — |
| Mount St. Rita Health Centre RI | Healthcare & Social Assistance | 0 | — | F |
| Mount Storm Forest Products, Inc. CA | Wholesale Trade | 0 | — | B |
| MOUNT TOM BOX COMANY MA | Manufacturing | 0 | — | A |
| Mount Vernon Hospital NY | — | 0 | — | — |
| Mount Vernon Imaging Center IL | Healthcare & Social Assistance | 0 | — | A |
| Mount Vernon Mills - Cuero Plant TX | — | 0 | — | — |
| Mount Vernon Mills Inc MS | Manufacturing | 0 | — | C |
| Mount Vernon Mills Inc NC | Manufacturing | 0 | — | C |
| Mount Vernon Nazarene University OH | Educational Services | 0 | — | A |
| Mount Washington College NH | — | 0 | — | — |
| Mountain Air Conditioning & Heating UT | Construction | 0 | — | F |
| Mountain America Federal Credit Union UT | Finance & Insurance | 2 | $140,525 | — |
| Mountain Area Health Education Center, Inc. NC | Educational Services | 0 | — | C |
| Mountain Artisan Company Limited CO | Construction | 1 | $70,512 | — |
| Mountain Base Mfg MA | Manufacturing | 0 | — | A |
| Mountain Beverage, LLC NC | Manufacturing | 0 | — | A |
| Mountain Building Supply GA | Retail Trade | 0 | — | A |
| Mountain Building Supply NC | Retail Trade | 0 | — | A |
