| 1 | LWAX | Laidlaw Environmental Services, Inc. | 1/1994-7/2005 (not listed) | | NAKINA |
| 2 | LWAX | Laidlaw Environmental Services, Inc. | 1/94-7/2000 | | NRHS |
| 3 | LWAX | *LAIDLAW ENVIRONMENTAL SERVICES, INC. | | | PWRC |
| 4 | LWAX | +CAROLINA STALITE COMPANY, LP | | | PWRC |
| 5 | LWAX | Laidlaw Environmental Services | | | RSRV |
| 6 | LWAX | CAROLINA STALITE COMPANY LP | | | SCAC4 |