| AF | Air Freight Companies | 2026 | 2025 | 2024 |
| AL | Airline Companies (PAX)
| 2026 | 2025 | 2024 |
| BL | Barge Line Companies | 2026 | 2025 | 2024 |
| EC | Electric Cooperatives | 2026 | 2025 | 2024 |
| EL | Electric Companies
| 2026 | 2025 | 2024 |
| EL-SOL | Solar Companies
| 2026 | 2025 | 2024 |
| GA | Gas Companies
| 2026 | 2025 | 2024 |
| MB | Motor Bus Companies (USDOT/FMCSA)
| 2026 | 2025 | 2024 |
| MC | Motor Carrier Companies (USDOT/FMCSA)
| 2026 | 2025 | 2024 |
| PC | Private Car Companies (Railcars)
| 2026 | 2025 | 2024 |
| PL | Pipeline Companies
| 2026 | 2025 | 2024 |
| PT | Power Transmission Companies
| 2026 | 2025 | 2024 |
| RR | Railroad Companies
| 2026 | 2025 | 2024 |
| TC | Telephone Cooperatives
| 2026 | 2025 | 2024 |
| TL | Telephone Long Distance Companies
| 2026 | 2025 | 2024 |
| TP | Telephone Companies (Local Exchange)
| 2026 | 2025 | 2024 |
| WC | Wireless Carrier Companies (PCS/Cellular)
| 2026 | 2025 | 2024 |
| WS | Water And Sewerage Companies
| 2026 | 2025 | 2024 |
| WM | Wireless Management Companies (Towers)
| 2026 | 2025 | 2024 |