| Clark Grave Vault Company TX | Manufacturing | 0 | — | A |
| Clark Hardwoods LLC TN | Manufacturing | 0 | — | A |
| Clark Heating & Cooling In c OH | Construction | 0 | — | F |
| CLARK HUBBARD LLC Bub City IL | — | 0 | — | — |
| Clark Hunt Construction, Inc. FL | Construction | 0 | — | D |
| CLARK ILLINOIS LLC Ema IL | — | 0 | — | — |
| CLARK INDUSTRIES, INC MO | Manufacturing | 0 | — | F |
| Clark Kjos Architects, LLC OR | Professional & Technical Services | 1 | $77,834 | — |
| Clark Laboratories NY | Manufacturing | 0 | — | A |
| CLARK LOFT LLC Beatrix IL | — | 0 | — | — |
| Clark Lumber Company, LLC TN | Manufacturing | 0 | — | F |
| Clark Machine Corp MD | Manufacturing | 0 | — | A |
| Clark Manor IL | Healthcare & Social Assistance | 0 | — | F |
| Clark Manufacturing MI | Manufacturing | 0 | — | B |
| CLARK Material Handling KY | Manufacturing | 0 | — | F |
| Clark Memorial Home Association OH | Healthcare & Social Assistance | 0 | — | A |
| Clark Metal Products Company PA | Manufacturing | 0 | — | F |
| Clark Moving & Storage NY | Transportation & Warehousing | 0 | — | A |
| Clark Pacific CA | Manufacturing | 0 | — | D |
| Clark Pest Control of Stockton, Inc. CA | Administrative & Waste Services | 0 | — | F |
| Clark Pest Control of Stockton, Inc. NV | Administrative & Waste Services | 0 | — | F |
| Clark Public Utilities WA | Utilities | 0 | — | A |
| Clark Pulley Industries, Inc. AL | Manufacturing | 0 | — | A |
| Clark Regional Medical Center KY | Healthcare & Social Assistance | 0 | — | F |
| Clark Regional Wastewater District WA | Utilities | 0 | — | C |
| Clark Retirement Community MI | Healthcare & Social Assistance | 0 | — | F |
| Clark Rigging & Rental Niagara Erecting NY | Construction | 0 | — | D |
| Clark Road Automotive Management, LLC FL | Retail Trade | 0 | — | A |
| Clark Roofing Co IL | Construction | 0 | — | F |
| clark rubber & plastic company OH | Manufacturing | 0 | — | A |
| Clark Service Group FL | Other Services | 0 | — | F |
| Clark Service Group PA | Other Services | 0 | — | F |
| Clark Specialty Co., Inc. NY | Manufacturing | 0 | — | F |
| CLARK STATION HOTEL LLC FL | Accommodation & Food Services | 0 | — | A |
| Clark Steel Fabricators, Inc. CA | Construction | 0 | — | F |
| Clark Technology LLC OH | Professional & Technical Services | 1 | $75,442 | — |
| clark tobacco farms inc. KY | Agriculture & Forestry | 0 | — | A |
| Clark Trailer Service INC. AL | Manufacturing | 0 | — | F |
| Clark Transportation & Consulting Services LLC NJ | Construction | 0 | — | A |
| Clark Transportation Consulting & Services, LLC MA | Construction | 0 | — | A |
| Clark Transportation Consulting & Services, LLC NJ | Professional & Technical Services | 1 | $112,258 | A |
| Clark Transportation Inc IL | Transportation & Warehousing | 0 | — | A |
| Clark Transportation Services LLC IL | Transportation & Warehousing | 0 | — | B |
| Clark University MA | Educational Services | 4 | $32,502,830 | — |
| Clark&Sullivan Builders dba Clark/Sullivan Construction CA | Construction | 0 | — | C |
| Clark's Precision Machine and Tool Inc. TX | Manufacturing | 0 | — | A |
| Clark's Quality Roofing UT | Construction | 0 | — | A |
| Clark's Termite & Pest Control SC | Administrative & Waste Services | 0 | — | F |
| Clark, Inc. PA | Construction | 0 | — | F |
| Clark, Schaefer, Hackett & Co. OH | Professional & Technical Services | 1 | $71,885 | — |
