| Pio M Construction CA | Construction | 0 | — | F |
| Piolax Corporation GA | Manufacturing | 0 | — | F |
| Pioneer AZ | Retail Trade | 0 | — | C |
| Pioneer A. Services Inc. CA | Agriculture & Forestry | 0 | — | F |
| Pioneer Ace NM, LLC NM | Retail Trade | 0 | — | C |
| Pioneer Aerospace Corp MS | Manufacturing | 0 | — | C |
| Pioneer Aerostructures MT | Manufacturing | 0 | — | D |
| Pioneer Associates, Inc. IN | Construction | 0 | — | F |
| Pioneer Associates, Inc. dba Williams Electric Company NC | — | 0 | — | — |
| PIONEER BANK MN | Finance & Insurance | 0 | — | A |
| Pioneer Cabinetry Inc MI | Manufacturing | 0 | — | F |
| Pioneer car wash CT | Other Services | 0 | — | A |
| Pioneer Center for Performing Arts NV | Real Estate | 0 | — | A |
| PIONEER CENTRAL HOLDING, INC CA | Professional & Technical Services | 1 | $61,526 | — |
| Pioneer Charter School of Science II MA | Educational Services | 2 | $85,174 | — |
| Pioneer Circuits, Inc. CA | Manufacturing | 0 | — | F |
| Pioneer Cladding and Glazing DC | Construction | 0 | — | F |
| Pioneer Cladding and Glazing Inc. IN | Construction | 0 | — | A |
| Pioneer Cladding and Glazing Inc. MD | Construction | 0 | — | F |
| Pioneer Cladding and Glazing Inc. OH | Construction | 0 | — | C |
| Pioneer Cladding and Glazing Inc. TN | Construction | 0 | — | A |
| Pioneer Coach, LLC TN | Transportation & Warehousing | 0 | — | D |
| Pioneer College Caterers, Inc. CA | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. IN | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. KS | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. KY | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. MN | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. NC | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. OH | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. OK | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. PA | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. SC | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. TN | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. TX | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. VA | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. WA | Accommodation & Food Services | 0 | — | A |
| Pioneer College Caterers, Inc. WY | Accommodation & Food Services | 0 | — | A |
| Pioneer Community Hospital MS | — | 0 | — | — |
| Pioneer Construction MI | Construction | 0 | — | D |
| Pioneer Construction Company, Inc. PA | Construction | 0 | — | A |
| PIONEER CONSULTING LLC IA | Professional & Technical Services | 34 | $109,104 | — |
| PIONEER CONSULTING SERVICES LLC NJ | Professional & Technical Services | 71 | $112,634 | — |
| Pioneer Container Corp MO | Manufacturing | 0 | — | C |
| Pioneer Contract Services, Inc. TX | Wholesale Trade | 0 | — | A |
| Pioneer Contracting Co., Ltd. HI | Administrative & Waste Services | 0 | — | A |
| Pioneer Credit Recovery NJ | — | 0 | — | — |
| Pioneer Custom Electrical Products, LLC CA | — | 0 | — | — |
| Pioneer Custom Molding, Inc. OH | Manufacturing | 0 | — | A |
| PIONEER DATA SYSTEMS INC NJ | Professional & Technical Services | 1 | $75,000 | — |
| Pioneer Electric Cooperative KS | Utilities | 0 | — | F |
