| 1 | PANX | Dorchester Gas Producing Co. | added 4/1962; 7/1965-4/1970; eliminated 4/1971 | | NAKINA |
| 2 | PANX | Dorchester Corp. | added 10/1954; 10/1957-4/1961; eliminated 4/1962 | | NAKINA |
| 3 | PANX | Panoma Corp. | 1/1950-7/1954; eliminated 10/1954 | | NAKINA |
| 4 | PANX | Panoma Corp. | Jan-52 | | NRHS |
| 5 | PANX | Dorchester Corp. | 10/57-4/61; eliminated 4/62 | | NRHS |
| 6 | PANX | Dorchester Gas Producing Co. | added 4/62; 7/65-4/70; eliminated 4/71 | | NRHS |
| 7 | PANX | DORCHESTER GAS PRODUCING CO. [PANOMA CORP.] | | | PWRC |
