| 1 | MANX | Semgroup LP | added 4/2005; 7/2005 | | NAKINA |
| 2 | MANX | Williams Energy Ventures, Inc. | added 10/1999; 7/2000; eliminated 4/2005 | | NAKINA |
| 3 | MANX | EnergyNorth Natural Gas, Inc. | 1/1994 | | NAKINA |
| 4 | MANX | Gas Supply, Inc. | eliminated 10/1999 | | NAKINA |
| 5 | MANX | EnergyNorth Natural Gas, Inc. | added 4/1989; eliminated 1/1996 | | NAKINA |
| 6 | MANX | Manchester Gas Co. | added 4/1974; 1/1975-1/1980; eliminated 4/1989 | | NAKINA |
| 7 | MANX | Manhattan Oil Co. | 8/1920 | | NAKINA |
| 8 | MANX | Bannock Leasing, Inc. | added 1/1966; eliminated 10/1966 | | NAKINA |
| 9 | MANX | Bannock Leasing, Inc. | added 1/66; eliminated 10/66 | | NRHS |
| 10 | MANX | Manchester Gas Co. | added 4/74; 1/75-1/80; eliminated 4/89 | | NRHS |
| 11 | MANX | EnergyNorth Natural Gas, Inc. | added 4/89; eliminated 1/96 | | NRHS |
| 12 | MANX | Gas Supply, Inc. | eliminated 10/99 | | NRHS |
| 13 | MANX | EnergyNorth Natural Gas, Inc. | Jan-94 | | NRHS |
| 14 | MANX | Williams Energy Ventures, Inc. | added 10/99; 7/2000 | | NRHS |
| 15 | MANX | *MANHATTAN OIL CO. | | | PWRC |
| 16 | MANX | *BANNOCK LEASING, INC. | | | PWRC |
| 17 | MANX | +SEMGROUP LP [WILLIAMS ENERGY VENTURES; ENERGY NORTH NATURAL GAS, INC.; GAS SUPPLY INCORPORATED; MANCHESTER GAS CO.] | | | PWRC |
| 18 | MANX | Manchester Gas | | | RSRV |
| 19 | MANX | SEMGROUP LP | | | SCAC4 |