| 1 | PYFE | PENNYS FOR LESS EXPRESS | | | SCAC4 |
| 2 | PYFI | PYROFAX INTERNATIONAL | | | SCAC3 |
| 3 | PYFS | PRIORITY FREIGHT SYSTEMS INC | | | SCAC4 |
| 4 | PYFX | Petrolane Gas Service Limited Partnership | added 7/1987; eliminated 7/1990 | | NAKINA |
| 5 | PYFX | Petrolane Gas Service, Inc. | added 1/1985; eliminated 7/1987 | | NAKINA |
| 6 | PYFX | Pyrofax Gas Corp. | added 7/1963; 7/1965-1/1980; eliminated 1/1985 | | NAKINA |
| 7 | PYFX | Pyrofax Gas Corp. | 7/65-1/80; eliminated 1/85 | | NRHS |
| 8 | PYFX | Petrolane Gas Service, Inc. | added 1/85; eliminated 7/87 | | NRHS |
| 9 | PYFX | Petrolane Gas Service Limited Partnership | added 7/87; eliminated 7/90 | | NRHS |
| 10 | PYFX | PETROLANE GAS SERVICE INC. | | | PWRC |
| 11 | PYFX | PYROFAX GAS CORP | | | SCAC3 |
