| 1 | KOPX | National Equipment Leasing Corp. | added 4/1962; 7/1965-1/1975; eliminated 4/1975; 1/1980 | | NAKINA |
| 2 | KOPX | Koppers Co., Inc. | 1/1941-1/1952 | | NAKINA |
| 3 | KOPX | Koppers Co. | 7/1937-4/1938 | | NAKINA |
| 4 | KOPX | The Koppers Co. | 7/1923-7/1935 | | NAKINA |
| 5 | KOPX | National Equipment Leasing Corp. | added 4/62; 7/65-1/75; eliminated 4/75; 1/80 | | NRHS |
| 6 | KOPX | Koppers Co., Inc. | 4/38-1/52 | | NRHS |
| 7 | KOPX | *KOPPERS CO. | | | PWRC |
| 8 | KOPX | *NATIONAL EQUIPMENT LEASING CORP. | | | PWRC |
