| Castelow Farms NC | Agriculture & Forestry | 0 | — | A |
| Caster Civil, Inc. CA | Construction | 0 | — | A |
| CASTER CONCEPTS INC. MI | Manufacturing | 0 | — | A |
| Caster Connection, Inc. OH | Manufacturing | 0 | — | A |
| CASTILLO & SONS LLC AL | Administrative & Waste Services | 0 | — | A |
| Castillo Engineering Services, LLC FL | Professional & Technical Services | 1 | $115,000 | — |
| Castillo Interiors LLC WA | Construction | 0 | — | A |
| Castillo Ready Mix Inc NM | Manufacturing | 0 | — | F |
| Casting Designs, Inc TX | Manufacturing | 0 | — | B |
| Casting Networks, LLC CA | Professional & Technical Services | 1 | $146,753 | — |
| Castle IN | Healthcare & Social Assistance | 0 | — | A |
| Castle & King Rock & Ready Mix CA | Manufacturing | 0 | — | F |
| Castle Branch, Inc. NC | Information & Media | 1 | $78,000 | — |
| Castle Builders Supply & Trucking, LLC PA | Manufacturing | 0 | — | F |
| Castle Constructors Company FL | Construction | 0 | — | A |
| Castle Contracting MI | Construction | 0 | — | A |
| Castle Contracting MO | Construction | 0 | — | A |
| Castle Contracting LLC NE | Construction | 0 | — | A |
| Castle Credit Co. Holdings, LLC IL | — | 0 | — | — |
| Castle Danger Brewing Co LLC MN | Manufacturing | 0 | — | D |
| Castle Delivery Services LLC PA | Transportation & Warehousing | 0 | — | F |
| Castle Energy Group, LLC MS | Construction | 0 | — | A |
| Castle Equipment Corporation VA | Construction | 0 | — | A |
| Castle Global, Inc. CA | Information & Media | 3 | $156,667 | — |
| Castle Grove Dairy LLC WA | Agriculture & Forestry | 0 | — | C |
| Castle Health Care IN | Healthcare & Social Assistance | 0 | — | A |
| CASTLE HEALTHCARE PROVIDERS LLC DBA ALARIS HEALTH AT CASTLE HILL NJ | Healthcare & Social Assistance | 0 | — | F |
| Castle Heating & Air OH | Construction | 0 | — | A |
| Castle in the Sand MD | Accommodation & Food Services | 0 | — | D |
| Castle Logistics LLC IA | Transportation & Warehousing | 0 | — | F |
| Castle Machine Company PA | Manufacturing | 0 | — | F |
| Castle Medical Center dba Adventist Health to Sodexo HI | — | 0 | — | — |
| CASTLE MEGASTORE GROUP INC AZ | Retail Trade | 0 | — | A |
| Castle Mold & Tool, Inc. PA | Manufacturing | 0 | — | A |
| Castle Oaks Golf Club CA | — | 0 | — | — |
| Castle Oil, Corporation NY | — | 0 | — | — |
| Castle on the Hudson NY | — | 0 | — | — |
| Castle Painting IL | Construction | 0 | — | A |
| Castle Park CA | Arts & Entertainment | 0 | — | F |
| Castle Pines Golf Club CO | Arts & Entertainment | 0 | — | F |
| Castle Point Learning Systems Corporation NJ | Educational Services | 2 | $104,000 | — |
| Castle Press CA | Manufacturing | 0 | — | A |
| Castle Rock Construction Company of Colorado,LLC CO | Construction | 0 | — | F |
| Castle Sanitation Corp. NY | Administrative & Waste Services | 1 | $104,000 | — |
| Castle Senior Living WI | Healthcare & Social Assistance | 0 | — | F |
| Castle Tire Recycling CA | Administrative & Waste Services | 0 | — | F |
| Castle Tire Recycling CO | Administrative & Waste Services | 0 | — | A |
| Castle Tire Recycling ID | Administrative & Waste Services | 0 | — | A |
| Castle Tire Recycling MT | Administrative & Waste Services | 0 | — | F |
| Castle Tire Recycling NV | Administrative & Waste Services | 0 | — | A |
