| 1 | SBPX | Koppers Co. | 7/1937-1/1941 | | NAKINA |
| 2 | SBPX | Spiffman, LLC | 7/2005 | | NAKINA |
| 3 | SBPX | Koppers Coal Co. (The Koppers Co.) | 7/1932-7/1935 | | NAKINA |
| 4 | SBPX | Seaboard By-Product Coke Co. (The Koppers Co.) | 7/1930 | | NAKINA |
| 5 | SBPX | Koppers Co. | Apr-38 | | NRHS |
| 6 | SBPX | *KOPPERS CO. [SEABOARD BY-PRODUCT COKE CO.] | | | PWRC |
| 7 | SBPX | +SPIFFMAN, LLC | | | PWRC |
| 8 | SBPX | Spiffman | | | RSRV |
| 9 | SBPX | SPIFFMAN LLC | | | SCAC4 |