| 1 | ASCX | Armco Steel Co., L.P. | added 7/1991; 1/1994; eliminated 10/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 2 | ASCX | The Algoma Steel Corp., Ltd. | eliminated 10/1987 | | NAKINA |
| 3 | ASCX | The Algoma Steel Co., Ltd. | added 1/1985 | | NAKINA |
| 4 | ASCX | (The) Almalgamated Sugar Co. | 8/1920-10/1957; eliminated 1/1959 | | NAKINA |
| 5 | ASCX | Almalgamated Sugar Co. | 4/38-10/57; eliminated 1/59 | | NRHS |
| 6 | ASCX | The Algoma Steel Co., Ltd. | added 1/85 | | NRHS |
| 7 | ASCX | The Algoma Steel Corp., Ltd. | eliminated 10/87 | | NRHS |
| 8 | ASCX | Armco Steel Co., L.P. | added 7/91; 1/94; eliminated 10/94; 7/2000 | | NRHS |
| 9 | ASCX | *AMALGAMATED SUGAR CO. | | | PWRC |
| 10 | ASCX | *ALGOMA STEEL CORP. LTD. | | | PWRC |
| 11 | ASCX | +ARMCO STEEL COMPANY, LP | | | PWRC |
| 12 | ASCX | Algoma Steel Corporation (Armco Steel) | | | RSRV |
| 13 | ASCX | ARMCO STEEL COMPANY, L.P. | | | SCAC4 |
