| 1 | CFIX | The Colorado Fuel & Iron Corp. | 7/1937-7/1965; eliminated 10/1966 | | NAKINA |
| 2 | CFIX | CF&I Steel Corp. | added 10/1966; 10/1966-1/1975; eliminated 1/1979 | | NAKINA |
| 3 | CFIX | The Colorado Fuel & Iron Co. | 7/1923-7/1935 | | NAKINA |
| 4 | CFIX | The Colorado Fuel & Iron Corp. | 4/38-7/65; eliminated 10/66 | | NRHS |
| 5 | CFIX | CF&I Steel Corp. | added 10/66; 10/66-1/75; eliminated 1/79 | | NRHS |
| 6 | CFIX | CF&I STEEL CORP. [COLORADO FUEL & IRON CO.] | | | PWRC |
| 7 | CFIX | COLORADO FUEL & IRON CORP THE | | | SCAC3 |
