| 1 | CHEX | Equistar Chemicals, LP | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 2 | CHEX | Quantum Chemical Corporation, USI Division | added 7/1988; 1/1994; eliminated 4/1998 | | NAKINA |
| 3 | CHEX | USI Chemicals Co., Division of National Distillers & Chemical Corp. | added 7/1987; eliminated 7/1988 | | NAKINA |
| 4 | CHEX | U.S. Industrial Chemicals Co., Division of National Distillers and Chemical Corp. | eliminated 7/1987 | | NAKINA |
| 5 | CHEX | USI Chemicals Co., Inc. | added 4/1987 | | NAKINA |
| 6 | CHEX | Enron Chemical Co. | added 10/1986; eliminated 4/1987 | | NAKINA |
| 7 | CHEX | NORCHEM, Inc. | added 1/1986; eliminated 10/1986 | | NAKINA |
| 8 | CHEX | NORCHEM | added 7/1985; eliminated 1/1986 | | NAKINA |
| 9 | CHEX | Northern Petrochemical Co. | added 4/1985; eliminated 7/1985 | | NAKINA |
| 10 | CHEX | Chemplex Co. | added 10/1967; 4/1970-1/1980; eliminated 4/1985 | | NAKINA |
| 11 | CHEX | Chemplex Co. | added 10/67; 4/70-1/80; eliminated 4/85 | | NRHS |
| 12 | CHEX | Northern Petrochemical Co. | added 4/85 | | NRHS |
| 13 | CHEX | NORCHEM | eliminated 1/86 | | NRHS |
| 14 | CHEX | NORCHEM, Inc. | added 1/86; eliminated 10/86 | | NRHS |
| 15 | CHEX | Enron Chemical Co. | added 10/86; eliminated 4/87 | | NRHS |
| 16 | CHEX | USI Chemicals Co., Inc. | added 4/87 | | NRHS |
| 17 | CHEX | U.S. Industrial Chemicals Co., Division of National Distillers and Chemical Corp. | eliminated 7/87 | | NRHS |
| 18 | CHEX | USI Chemicals Co., Division of National Distillers & Chemical Corp. | added 7/87; eliminated 7/88 | | NRHS |
| 19 | CHEX | Quantum Chemical Corporation, USI Division | added 7/88; 1/94; eliminated 4/98 | | NRHS |
| 20 | CHEX | Equistar Chemicals, LP | added 4/98; 7/2000 | | NRHS |
| 21 | CHEX | EQUISTAR CHEMICALS [(USIX) QUANTUM CHEMICAL CORPORATION, USI DIVISION; CHEMPLEX CO.; ENRON; NORCHEM; AND OTHER PREDECESSOR COMPANIES] | | | PWRC |
| 22 | CHEX | Chemplex (Equistar Chemicals) | | | RSRV |
| 23 | CHEX | EQUISTAR CHEMICALS LP | | | SCAC4 |