| 1 | HRDX | Silver Star Enterprises, Inc. | added 1/1994; 7/2000; eliminated 7/2004; 7/2005 (not listed) | | NAKINA |
| 2 | HRDX | M-P Petroleum Ltd. | added 10/1975; eliminated 10/1978 | | NAKINA |
| 3 | HRDX | Hagaman Refining Co. | 8/1920 | | NAKINA |
| 4 | HRDX | Hydrocarbons Inc. | added 10/1974; 1/1975; eliminated 10/1975 | | NAKINA |
| 5 | HRDX | Hydrocarbons Inc. | added 10/74; 1/75 | | NRHS |
| 6 | HRDX | M-P Petroleum Ltd. | eliminated 10/78 | | NRHS |
| 7 | HRDX | Silver Star Enterprises, Inc. | added 1/94; 7/2000 | | NRHS |
| 8 | HRDX | *HAGAMAN REFINING CO. | | | PWRC |
| 9 | HRDX | *M-P PETROLEUM LTD. [HYDROCARBONS, INC.] | | | PWRC |
| 10 | HRDX | +SILVER STAR ENTERPRISES, INC. | | | PWRC |
| 11 | HRDX | Hagaman Refining (Silver Star Enterprises) | | | RSRV |
