| Willard Agri-Service of Frederick, Inc. PA | Wholesale Trade | 0 | — | A |
| Willbanks Metals Inc TX | Manufacturing | 0 | — | F |
| Willbloom Partners LTD / Liberty Hospitality Partners PA | Accommodation & Food Services | 0 | — | A |
| Willborn Bros. Co. LLC TX | Construction | 0 | — | F |
| Willbrandt Enterprises, Inc. MI | Agriculture & Forestry | 0 | — | A |
| Willco Underground TX | Construction | 0 | — | A |
| WillCon FL | Construction | 0 | — | A |
| Willcox/Cochise KOA AZ | Accommodation & Food Services | 0 | — | A |
| Willdan Energy Company CA | Professional & Technical Services | 1 | $89,357 | — |
| Willdan Energy Solutions CA | Professional & Technical Services | 1 | $78,562 | — |
| Willdan Group, Inc. AZ | Professional & Technical Services | 0 | — | F |
| Willdan Group, Inc. CA | Construction | 0 | — | C |
| Willdan Group, Inc. CO | Professional & Technical Services | 0 | — | A |
| Willdan Group, Inc. MA | Professional & Technical Services | 0 | — | A |
| Willdan Group, Inc. MD | Construction | 0 | — | A |
| Willdan Group, Inc. NC | Construction | 0 | — | A |
| Willdan Group, Inc. NJ | Construction | 0 | — | A |
| Willdan Group, Inc. NY | Professional & Technical Services | 0 | — | F |
| Willdan Group, Inc. WA | Construction | 0 | — | A |
| Willdan Lighting and Electric CA | Professional & Technical Services | 1 | $85,862 | — |
| Wille Bros., Co. IL | Manufacturing | 0 | — | C |
| Willer Tool Corporation WI | Manufacturing | 0 | — | A |
| Willert Home Products, Inc. MO | Manufacturing | 0 | — | F |
| Willert Manufacturing Co., LLC PA | Manufacturing | 0 | — | F |
| Willet Dairy, LLC NY | Agriculture & Forestry | 0 | — | D |
| Willet Hauser Company, LLC MN | Construction | 0 | — | F |
| Willett, Hofmann & Associates, Inc. IL | Professional & Technical Services | 1 | $125,000 | — |
| Willetts Sprinkler Design, Inc. NJ | Construction | 0 | — | A |
| Willey's, Inc. DE | Retail Trade | 0 | — | B |
| Willgreg Inc OK | Wholesale Trade | 0 | — | F |
| Willham Roofing Co. Inc. OH | Construction | 0 | — | A |
| William & Co Foods Inc MA | Wholesale Trade | 0 | — | F |
| William & Inez Mabel Skilled Nursing Facility CA | — | 0 | — | — |
| William A Fraser Inc PA | Real Estate | 0 | — | C |
| William A Randolph, Inc IL | Construction | 0 | — | A |
| William Anthony Excavating Inc. RI | Construction | 0 | — | A |
| William Aurthur / Crane Co ME | — | 0 | — | — |
| William Barnet & Son LLC GA | Manufacturing | 0 | — | A |
| William Barnet & Son LLC NC | Manufacturing | 0 | — | A |
| William Barnet & Son LLC SC | Manufacturing | 0 | — | A |
| William Beaumont Hospital MI | Healthcare & Social Assistance | 5 | $92,531 | — |
| William Bee Ririe Hospital NV | Healthcare & Social Assistance | 0 | — | A |
| William Blair & Company, LLC IL | Finance & Insurance | 3 | $170,800 | — |
| William Blair Investment Management, LLC IL | Finance & Insurance | 2 | $163,750 | — |
| William Blanford DDS PLLC NY | Healthcare & Social Assistance | 1 | $247,000 | — |
| william c reynolds co NC | Construction | 0 | — | A |
| William C Rott & Son Inc. NY | Construction | 0 | — | F |
| William Carey University MS | Educational Services | 1 | $35,000 | — |
| William Carter Compnay GA | Transportation & Warehousing | 0 | — | C |
| William Charles Construction IL | Construction | 0 | — | A |
