| 1 | HPIX | Basell U.S.A., Inc. | added 1/2001; 7/2005 | | NAKINA |
| 2 | HPIX | Montell U.S.A., Inc. | added 4/1996; 7/2000; eliminated 1/2001 | | NAKINA |
| 3 | HPIX | Himont U.S.A., Inc. | added 1/1984; 1/1994; eliminated 4/1996 | | NAKINA |
| 4 | HPIX | Himont U.S.A., Inc. | 1/94; eliminated 4/96 | | NRHS |
| 5 | HPIX | Montell U.S.A., Inc. | added 4/96; 7/2000; eliminated 1/2001 | | NRHS |
| 6 | HPIX | Basell U.S.A., Inc. | added 1/2001 | | NRHS |
| 7 | HPIX | BESELL USA, INC. [MONTELL USA INC.; HIMONT USA, INC.} | | | PWRC |
| 8 | HPIX | HIMONT USA (Besell USA) | | | RSRV |
| 9 | HPIX | BASELL USA INC | | | SCAC4 |
