| 1 | CEPX | Trinity Industries Leasing Co. | added 10/2000; 7/2005 | | NAKINA |
| 2 | CEPX | Cajun Electric Power Cooperative, Inc. | added 1/1979; 1/1980-1/1994; eliminated 4/1995; 7/2000 (not listed) | | NAKINA |
| 3 | CEPX | Certain-teed Products Corp. | 8/1920-1/1941 | | NAKINA |
| 4 | CEPX | Certain-teed Products Corp. | Apr-38 | | NRHS |
| 5 | CEPX | Cajun Electric Power Cooperative, Inc. | added 1/79; 1/80-1/94; eliminated 4/95; 7/2000 | | NRHS |
| 6 | CEPX | Trinity Industries Leasing Co. | added 10/2000 | | NRHS |
| 7 | CEPX | *CERTAIN-TEED PRODUCTS CORP. | | | PWRC |
| 8 | CEPX | *CAJUN ELECTRIC POWER COOPERATIVE, INC. | | | PWRC |
| 9 | CEPX | *CENTRAL PLATEAU | | | PWRC |
| 10 | CEPX | +TRINITY INDUSTRIES LEASING CO. | | | PWRC |
| 11 | CEPX | Cajun Electric Power Cooperative (Trinity Industries Leasing) | | | RSRV |
| 12 | CEPX | TRINITY INDUSTRIES LEASING COMPANY | | | SCAC4 |