| 1 | WRPX | Warr-Penn Refining Co. | 7/1930-7/1932 | | NAKINA |
| 2 | WRPX | Public Service Co. of Indiana, Inc. | added 10/1978; 1/1980; eliminated 1/1991 | | NAKINA |
| 3 | WRPX | PSI Energy, Inc. | added 1/1991; 1/1994; eliminated 10/1998; 7/2000 (not listed); added 10/2000; eliminated 1/2001; 7/2005 (not listed) | | NAKINA |
| 4 | WRPX | Public Service Co. of Indiana, Inc. | added 10/78; 1/80; eliminated 1/91 | | NRHS |
| 5 | WRPX | PSI Energy, Inc. | added 1/91; 1/94; eliminated 10/98; 7/2000; added 10/2000; eliminated 1/2001 | | NRHS |
| 6 | WRPX | *WARR-PENN REFINING CO. | | | PWRC |
| 7 | WRPX | *(PSIX) PSI ENERGY, INC. (PUBLIC SERVICE CO. OF INDIANA) | | | PWRC |
| 8 | WRPX | Warr-Penn Refining (Public Service of Indiana) | | | RSRV |