| 1 | COPX | Canexus Chemicals Canada Limited Partnership | added 1/2010 | | NAKINA |
| 2 | COPX | Nexen Chemical Canada Limited Partnership | added 4/2002; 7/2005; eliminated 1/2010 | | NAKINA |
| 3 | COPX | Canadianoxy Industrial Chemicals Ltd. Partnership | 1/1994 (not listed); added 1/1997; 7/2000; eliminated 4/2002 | | NAKINA |
| 4 | COPX | Consolidated Products, Division of National Dairy Products Corp. | added 1/1958; eliminated 7/1958 | | NAKINA |
| 5 | COPX | Choate Oil Corp. | 8/1920 | | NAKINA |
| 6 | COPX | Consolidated Products Co. | 1/1950-10/1957; eliminated 1/1958 | | NAKINA |
| 7 | COPX | Consolidated Products Co. | 1/52-10/57; eliminated 1/58 | | NRHS |
| 8 | COPX | Consolidated Products, Division of National Dairy Products Corp. | added 1/58; eliminated 7/58 | | NRHS |
| 9 | COPX | Canadianoxy Industrial Chemicals Ltd. Partnership | 1/94; added 1/97; 7/2000 | | NRHS |
| 10 | COPX | *CANADIANOXY INDUSTRIAL CHEMICALS LIMITED PARTNERSHIP | | | PWRC |
| 11 | COPX | *CHOATE OIL CORP. | | | PWRC |
| 12 | COPX | *CONSOLIDATED PRODUCTS CO., DIV. NATIONAL DAIRY PRODUCTS CORP. | | | PWRC |
| 13 | COPX | +NEXEN CHEMICAL CANADA LTD. PARTNERSHIP [CANADIANOXY INDUSTRIAL CHEMICALS LTD. PARTNERSHIP} | | | PWRC |
| 14 | COPX | *CITY OF PORTLAND | | | PWRC |
| 15 | COPX | CanadianOxy Industrial Chemicals | | | RSRV |
| 16 | COPX | CANEXUS CHEMICALS CANADA LIMITED PA | | | SCAC4 |