| Clay Electric Cooperative, Inc. FL | Utilities | 0 | — | C |
| Clay Ingels Company, LLC. KY | Construction | 0 | — | F |
| Clay Labs, Inc. NY | Professional & Technical Services | 2 | $205,000 | — |
| Clay Plaster and Stucco TX | Construction | 0 | — | A |
| Clay Platte Venture Group MO | Retail Trade | 0 | — | A |
| Clay's Performance Construction LLC WV | Construction | 0 | — | A |
| CLAY-TECH TECHNOLOGY LLC. TX | Professional & Technical Services | 1 | $105,976 | — |
| CLAYARCH, INC. GU | Construction | 2 | $58,800 | — |
| Clayco NC | Construction | 0 | — | A |
| Clayco Electric Company Inc. MO | Construction | 0 | — | F |
| Clayco, Inc. MO | Construction | 16 | $102,070 | A |
| Claycomo Releasing, Inc. (Updated 05-10-2018) MO | — | 0 | — | — |
| Clayens CT | Manufacturing | 0 | — | A |
| Clayens IL | Manufacturing | 0 | — | F |
| Clayens RI | Manufacturing | 0 | — | A |
| Claymar Construction II, Inc. LA | Construction | 0 | — | A |
| Claymont Rehabilitation Center OH | Healthcare & Social Assistance | 0 | — | F |
| Claypool Electric OH | Construction | 0 | — | C |
| Claystone Construction Inc CO | Mining & Extraction | 0 | — | F |
| Clayton AL | Manufacturing | 0 | — | F |
| Clayton and Crume KY | Manufacturing | 0 | — | D |
| Clayton Board of Education NJ | Educational Services | 0 | — | D |
| Clayton Corporation MO | Manufacturing | 0 | — | D |
| Clayton County Community Services Authority, Inc. GA | Healthcare & Social Assistance | 0 | — | A |
| Clayton County Recycling IA | Wholesale Trade | 0 | — | A |
| Clayton Fixture Co, Inc. GA | Manufacturing | 0 | — | F |
| CLAYTON HEALTH SYSTEMS NM | Healthcare & Social Assistance | 1 | $66,914 | — |
| Clayton Home Builders NC | Manufacturing | 0 | — | A |
| Clayton Homes AL | Manufacturing | 0 | — | D |
| Clayton Homes AZ | Manufacturing | 0 | — | F |
| Clayton Homes IN | Manufacturing | 0 | — | D |
| Clayton Homes NC | Manufacturing | 0 | — | F |
| Clayton Homes NY | Construction | 0 | — | A |
| Clayton Homes PA | Manufacturing | 0 | — | A |
| Clayton Homes TN | Manufacturing | 0 | — | B |
| Clayton Homes TX | Manufacturing | 0 | — | F |
| Clayton Homes Albuquerque NM | Manufacturing | 0 | — | F |
| Clayton Homes Appalachia TN | Manufacturing | 0 | — | F |
| Clayton Homes dba Golden West Homes OR | Manufacturing | 0 | — | B |
| Clayton Homes Hermiston OR | Manufacturing | 0 | — | F |
| Clayton Homes Perris CA | Manufacturing | 0 | — | F |
| Clayton Homes Sacramento CA | Manufacturing | 0 | — | F |
| Clayton Homes Trendsetter Homes Div. TX | — | 0 | — | — |
| Clayton Industries AL | Manufacturing | 0 | — | A |
| Clayton Industries CA | Manufacturing | 0 | — | C |
| Clayton Industries NJ | Manufacturing | 0 | — | F |
| Clayton Industries OH | Manufacturing | 0 | — | A |
| Clayton International, Inc. GA | Manufacturing | 0 | — | A |
| Clayton LLC dba Bluebird Graphic Solutions MA | Manufacturing | 0 | — | A |
| Clayton Lumber MI | Manufacturing | 0 | — | A |
