| 1 | IOCX | Rail Enterprises, Inc. | added 10/1997; eliminated 4/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 2 | IOCX | Illinois Oil Co. | 8/1920-1/1945 | | NAKINA |
| 3 | IOCX | Illinois Oil Co. | Apr-38 | | NRHS |
| 4 | IOCX | Rail Enterprises, Inc. | added 10/97; eliminated 4/98; 7/2000 | | NRHS |
| 5 | IOCX | *ILLINOIS OIL CO.. | | | PWRC |
| 6 | IOCX | +RAIL ENTERPRISES INCORPORATED | | | PWRC |
| 7 | IOCX | Illinois Oil Co. (Rail Enterprises) | | | RSRV |
| 8 | IOCX | RAIL ENTERPRISES INC (ACTING AGENT | | | SCAC4 |
