| 1 | COBX | Cobre Mining Co. | added 1/1997; eliminated 7/1999; 7/2000 (not listed) | | NAKINA |
| 2 | COBX | Cobre Mining Co., Inc. | eliminated 1/1997 | | NAKINA |
| 3 | COBX | Union Tank Car Co. | added 10/1953; 7/1954-10/1957; eliminated 4/1959 | | NAKINA |
| 4 | COBX | Transit Co., Ltd. | 1/1952; eliminated 10/1953 | | NAKINA |
| 5 | COBX | Imperial Oil, Ltd. | 7/1935-1/1950 | | NAKINA |
| 6 | COBX | Imperial Oil, Ltd. | Apr-38 | | NRHS |
| 7 | COBX | Transit Co., Ltd. | 1/52; eliminated 10/53 | | NRHS |
| 8 | COBX | Union Tank Car Co. | added 10/53; 10/57 | | NRHS |
| 9 | COBX | Cobre Mining Co., Inc. | eliminated 1/97 | | NRHS |
| 10 | COBX | Cobre Mining Co. | added 1/97; eliminated 7/99; 7/2000 | | NRHS |
| 11 | COBX | *IMPERIAL OIL, LTD. | | | PWRC |
| 12 | COBX | *UNION TANK CAR CO. [TRANSIT CO. LTD.] | | | PWRC |
| 13 | COBX | *COBRE MINING COMPANY LIMITED | | | PWRC |
| 14 | COBX | Cobre Mining | | | RSRV |
| 15 | COBX | COBRA TRADING LLC | | | SCAC4 |
