| Frontier Dispatch FL | — | 0 | — | — |
| Frontier Distributing, Inc. MI | Wholesale Trade | 0 | — | F |
| Frontier Drywall Supply CO | Wholesale Trade | 0 | — | C |
| Frontier Dubuque Hotels, LLC IA | Accommodation & Food Services | 0 | — | A |
| Frontier Electronic Systems, Corp OK | Manufacturing | 0 | — | F |
| Frontier Enterp;rise TX | — | 0 | — | — |
| Frontier Feedlot Dublin LLC TX | Agriculture & Forestry | 0 | — | A |
| Frontier Fire Protection MN | Construction | 0 | — | F |
| Frontier Fire Protection, LLC CO | Public Administration | 0 | — | A |
| Frontier Foods Cold and Storage TX | Transportation & Warehousing | 0 | — | B |
| Frontier Forklifts and Service, Inc. TX | Other Services | 0 | — | F |
| Frontier Glass Inc. NY | Construction | 0 | — | A |
| Frontier Group, Inc. AZ | Manufacturing | 0 | — | A |
| Frontier Hospice OK | Healthcare & Social Assistance | 0 | — | F |
| Frontier Hospitality Group IA | Accommodation & Food Services | 0 | — | A |
| Frontier Hospitality Group of Illinois IL | Accommodation & Food Services | 0 | — | F |
| Frontier Hot-Dip Galvanizing NY | Manufacturing | 0 | — | F |
| Frontier Industrial Corp NY | Construction | 0 | — | A |
| Frontier Industrial Corp OH | Construction | 0 | — | A |
| Frontier Industrial Corp WV | Construction | 0 | — | A |
| Frontier Insurance Company NY | — | 0 | — | — |
| Frontier Integrity Solutions OK | Professional & Technical Services | 0 | — | A |
| Frontier Investment Group LLC DE | Wholesale Trade | 2 | $89,000 | — |
| Frontier IT Solutions Inc VA | Professional & Technical Services | 11 | $110,976 | — |
| Frontier K2, LLC TX | Administrative & Waste Services | 0 | — | F |
| Frontier Logistical Services, LLc. TN | Transportation & Warehousing | 0 | — | D |
| FRONTIER LOGISTICS INC NY | Transportation & Warehousing | 0 | — | C |
| Frontier Management AR | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management AZ | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management CA | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management ID | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management IN | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management MA | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management OR | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management TX | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management WA | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management Corp. IA | Accommodation & Food Services | 0 | — | F |
| Frontier Management LLC IL | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management LLC MT | Healthcare & Social Assistance | 0 | — | A |
| Frontier Management LLC UT | Healthcare & Social Assistance | 0 | — | F |
| Frontier Management, LLC WI | Healthcare & Social Assistance | 0 | — | F |
| Frontier Managemet LLC AZ | Healthcare & Social Assistance | 0 | — | A |
| Frontier Mechanical Inc. CO | Construction | 0 | — | F |
| Frontier Natural Gas Company NC | Utilities | 0 | — | F |
| Frontier Paving Inc. CO | Construction | 0 | — | F |
| Frontier Performance Lubricants Inc. CA | Wholesale Trade | 0 | — | A |
| Frontier Personnel, LLC CA | Construction | 0 | — | F |
| Frontier Power Company OH | Utilities | 0 | — | A |
| Frontier Roofing & Construction LLC OR | Manufacturing | 0 | — | A |
| Frontier Schools, Inc. MO | Educational Services | 4 | $63,970 | — |
