| 1 | UCPX | Union Carbide Chemicals Co., Division of Union Carbide Corp. | added 7/1961; eliminated 10/1963 | | NAKINA |
| 2 | UCPX | Union Carbide Corp., Chemicals Division | added 10/1963; 7/1965-10/1966; eliminated 10/1967 | | NAKINA |
| 3 | UCPX | Union Carbide Corp., Chemicals and Plastics | added 10/1967; eliminated 1/1968 | | NAKINA |
| 4 | UCPX | Union Carbide Corp., Chemicals and Plastics Operations Division | added 1/1968; eliminated 4/1969 | | NAKINA |
| 5 | UCPX | Essem Corp. | added 4/1969; 4/1970-1/1980; eliminated 7/1985 | | NAKINA |
| 6 | UCPX | Union Carbide Corp., Chemicals Division | 7/65-10/66; eliminated 10/67 | | NRHS |
| 7 | UCPX | Union Carbide Corp., Chemicals and Plastics | added 10/67; eliminated 1/68 | | NRHS |
| 8 | UCPX | Union Carbide Corp., Chemicals and Plastics Operations Division | added 1/68; eliminated 4/69 | | NRHS |
| 9 | UCPX | Essem Corp. | added 4/69; 4/70-1/80 | | NRHS |
| 10 | UCPX | ESSEM CORP. - UNION CARBIDE CORP., LESSEE | | | PWRC |
| 11 | UCPX | Essem Corporation | | | RSRV |