| C. J. Mahan Construction Company IN | Construction | 0 | — | A |
| C. J. Mahan Construction Company KY | Construction | 0 | — | A |
| C. J. Mahan Construction Company OH | Construction | 0 | — | F |
| C. J. Mahan Construction Company TN | Construction | 0 | — | A |
| C. M. High, Inc. PA | Construction | 0 | — | B |
| C. M. JOSLIN COMPANY, INC. TX | Administrative & Waste Services | 0 | — | C |
| C. M. Mitchell Construction Co. Inc. NC | Construction | 0 | — | D |
| C. M. Morris Group Inc WI | Construction | 0 | — | D |
| C. Martin Company, Inc. NV | — | 0 | — | — |
| C. MICAH RAND, INC. - HCMG OH | Healthcare & Social Assistance | 0 | — | F |
| C. Morgen Masonry, Inc. CO | Construction | 0 | — | F |
| C. Naughton Corp. MA | Construction | 0 | — | A |
| C. O. Falter Construction Corp. NY | Construction | 0 | — | A |
| C. Overaa & Co. CA | Construction | 0 | — | A |
| C. Palmer Die Casting, Inc. MD | Manufacturing | 0 | — | F |
| C. R. Crawford Construction, LLC AR | Construction | 0 | — | C |
| C. Raymond Davis & Sons, Inc. PA | Construction | 0 | — | A |
| C. S. Beatty Construction, Inc. AL | Construction | 0 | — | A |
| C. S. Humphrey & Company, LLC MO | Manufacturing | 0 | — | A |
| C. S. Wo & Sons, LLC. HI | Retail Trade | 0 | — | B |
| C. Thornton, Inc. AL | Construction | 0 | — | F |
| C. Tucker Cope & Assoc OH | Construction | 0 | — | D |
| C. U. E. INC. PA | Manufacturing | 0 | — | F |
| C. V. ASSOCIATES NY; PE, LS, P.C. NY | Professional & Technical Services | 6 | $88,962 | — |
| C. W. MATTHEWS CONTRACTING CO., INC. GA | Construction | 0 | — | F |
| C. William Hetzer, Inc. MD | Construction | 0 | — | F |
| C. Wonder LLC NY | — | 0 | — | — |
| C. Wright's Machine Tool, Inc. TX | Manufacturing | 0 | — | F |
| C.A. BUCHEN CORP. CA | Manufacturing | 0 | — | F |
| C.A. Butler OH | Administrative & Waste Services | 0 | — | F |
| C.A. Ferolie NJ | Wholesale Trade | 0 | — | A |
| C.A. Group, Inc. NV | Professional & Technical Services | 1 | $145,600 | — |
| C.A. Hull Co., Inc. MI | Construction | 0 | — | C |
| C.A. Lewis, Inc. NC | Construction | 0 | — | A |
| C.A. Lindman, Inc. MD | Construction | 0 | — | F |
| C.A. Murren & Sons Company, Inc GA | Construction | 0 | — | B |
| C.A. Reed Associates, Inc. NY | Construction | 0 | — | F |
| C.A. Schroeder, Inc. / CASCO CA | Manufacturing | 0 | — | F |
| C.A. Senecal Electrical Services, Inc. MA | Construction | 0 | — | A |
| C.A. Smith Inc. NY | Retail Trade | 0 | — | A |
| C.A.B. Construction Co. MN | Manufacturing | 0 | — | F |
| C.A.C. INDUSTRIES, INC. NY | Construction | 1 | $136,000 | — |
| C.B Nichols Egg Ranch CA | Wholesale Trade | 0 | — | A |
| C.B. Management Company, Inc. MO | Management of Companies | 0 | — | A |
| C.C. Construction, Inc. MA | Construction | 0 | — | F |
| C.C. Controlled Combustion Co. Inc. NY | Construction | 1 | $196,851 | — |
| C.C.M.S. NY | Healthcare & Social Assistance | 4 | $76,570 | — |
| C.D. Smith Construction WI | Construction | 0 | — | C |
| C.D.S. CONTRACTORS, INC. FL | Construction | 0 | — | F |
| C.E. Bourne & Co., Inc. SC | Construction | 0 | — | F |
