| 1 | PNSX | Chem-Nuclear Systems, LLC | 7/2000 (not listed) | | NAKINA |
| 2 | PNSX | VECTRA Technologies, Inc. | added 4/1995; eliminated 4/1998 | | NAKINA |
| 3 | PNSX | Pacific Nuclear Systems, Inc. | added 1/1988; 1/1994; eliminated 4/1995 | | NAKINA |
| 4 | PNSX | Pacific Nuclear Systems, Inc. | added 1/88; 1/94; eliminated 4/95 | | NRHS |
| 5 | PNSX | VECTRA Technologies, Inc. | added 4/95; eliminated 4/98 | | NRHS |
| 6 | PNSX | Chem-Nuclear Systems, LLC | Jul-00 | | NRHS |
| 7 | PNSX | *VECTRA TECHNOLOGIES [PACIFIC NUCLEAR SYSTEMS, INC.] | | | PWRC |
| 8 | PNSX | *CHEM-NUCLEAR SYSTEMS L.L.C. | | | PWRC |
| 9 | PNSX | Chem-Nuclear Systems | | | RSRV |
