| Diamond Chrome Plating, Inc. MI | Manufacturing | 0 | — | F |
| Diamond Comic Distributors, Inc. MD | — | 0 | — | — |
| Diamond Comic Distributors, Inc. MS | — | 0 | — | — |
| Diamond Communications Solutions IA | — | 0 | — | — |
| Diamond Concrete Products LLC GA | Manufacturing | 0 | — | F |
| Diamond Concrete Supply CA | Manufacturing | 0 | — | F |
| Diamond Construction Company IL | Construction | 0 | — | A |
| Diamond Construction Inc MT | Construction | 0 | — | A |
| Diamond Contracting Corp CO | Construction | 0 | — | F |
| Diamond Crystal Brands GA | Manufacturing | 0 | — | A |
| Diamond Crystal Brands OH | — | 0 | — | — |
| Diamond Custom Machines Corporation NJ | Manufacturing | 1 | $91,894 | — |
| Diamond D LLC CA | Agriculture & Forestry | 0 | — | F |
| DIAMOND DASH DELIVERY CA | Transportation & Warehousing | 0 | — | C |
| diamond door OH | Manufacturing | 0 | — | A |
| Diamond Drilling & Sawing Company CO | Construction | 0 | — | B |
| Diamond Drugs, Inc. PA | Wholesale Trade | 0 | — | B |
| Diamond Drywall System Inc. CA | Construction | 0 | — | A |
| Diamond Electric WV | Manufacturing | 0 | — | D |
| Diamond Electric Mfg. Corporation WV | Manufacturing | 1 | $95,930 | — |
| Diamond Elite Labor Services, Inc. CA | Agriculture & Forestry | 0 | — | C |
| Diamond Envelope Corporation IL | Manufacturing | 0 | — | A |
| Diamond Everley Roofing Contractors KS | Construction | 0 | — | F |
| Diamond Excavating, Inc. CO | Construction | 0 | — | F |
| Diamond Food Distributors LA | Wholesale Trade | 0 | — | A |
| Diamond Food Market's, Inc. TX | Retail Trade | 0 | — | A |
| Diamond Foods LLC CA | Wholesale Trade | 0 | — | F |
| Diamond Foods, Inc IN | — | 0 | — | — |
| Diamond Forest Resources, Inc. KY | Manufacturing | 0 | — | F |
| Diamond Foundry WA | Manufacturing | 0 | — | A |
| Diamond Foundry Inc CA | Manufacturing | 2 | $2,038,327 | A |
| Diamond Fruit Growers OR | Wholesale Trade | 0 | — | D |
| Diamond Generation Corporation CA | Utilities | 0 | — | A |
| Diamond Glass & Metals, LLC HI | Construction | 0 | — | A |
| Diamond Glass Company, Inc. GA | Construction | 0 | — | F |
| Diamond Green Diesel TX | Construction | 0 | — | A |
| Diamond Green Diesel - New Orleans, LLC LA | Manufacturing | 0 | — | A |
| Diamond Green Diesel LLC LA | Construction | 0 | — | A |
| Diamond Ground Products, Inc. CA | Wholesale Trade | 0 | — | A |
| Diamond Group of Companies SC | Real Estate | 0 | — | F |
| Diamond Healthcare PA | Healthcare & Social Assistance | 0 | — | F |
| Diamond Healthcare of James City County, Inc. VA | Healthcare & Social Assistance | 0 | — | A |
| Diamond Healthcare of Williamsburg, LLC VA | Healthcare & Social Assistance | 0 | — | A |
| Diamond Heat Treat, LLC IL | Manufacturing | 0 | — | A |
| Diamond Heating & Cooling, LLC ID | Manufacturing | 0 | — | F |
| Diamond Hill Plywood NC | Wholesale Trade | 0 | — | A |
| Diamond Hill Plywood SC | Wholesale Trade | 0 | — | A |
| Diamond Hill Plywood TN | Wholesale Trade | 0 | — | F |
| Diamond Hill Plywood VA | Wholesale Trade | 0 | — | A |
| Diamond Hill Plywood-Greenville SC | Wholesale Trade | 0 | — | F |
