| 1 | ECDX | Ethyl Corp. | added 4/2006 | | NAKINA |
| 2 | ECDX | Ethyl Petroleum Additives, Inc. | added 1/1985; 1/1994-7/2005; eliminated 1/2006 | | NAKINA |
| 3 | ECDX | Edwin Cooper, Inc. | added 4/1979; 1/1980; eliminated 1/1985 | | NAKINA |
| 4 | ECDX | Edwin Cooper, Inc. | added 4/79; 1/80; eliminated 1/85 | | NRHS |
| 5 | ECDX | Ethyl Petroleum Additives, Inc. | added 1/85; 1/94-7/2000 | | NRHS |
| 6 | ECDX | *EDWIN COOPER, INC. | | | PWRC |
| 7 | ECDX | +ETHYL CORP. [ETHYL PETROLEUM ADDITIVES, INC.] | | | PWRC |
| 8 | ECDX | Edwin Cooper | | | RSRV |
| 9 | ECDX | ETHYL PETROLEUM ADDITIVES, INC. | | | SCAC4 |
