| 1 | DVLX | Sulcom Inc. | added 7/2004; 7/2005 | | NAKINA |
| 2 | DVLX | Freeport-McMoRan Sulphur LLC | added 1/1999; 7/2000; eliminated 7/2004 | | NAKINA |
| 3 | DVLX | Freeport-McMoRan Sulphur Inc. | added 4/1998; eliminated 1/1999 | | NAKINA |
| 4 | DVLX | Freeport Sulphur Co., a Division of Freeport-McMoRan Resource Partners, Ltd. | eliminated 4/1998 | | NAKINA |
| 5 | DVLX | Freeport Sulphur Co. | added 7/1996 | | NAKINA |
| 6 | DVLX | Pennzoil Co. | added 4/1992; 1/1994; eliminated 4/1996 | | NAKINA |
| 7 | DVLX | Pennzoil Sulphur Co. | added 4/1985; eliminated 4/1992 | | NAKINA |
| 8 | DVLX | Duval Corp. | added 7/1978; 1/1980; eliminated 4/1985 | | NAKINA |
| 9 | DVLX | Duval Sales Corp. | 1/1975 | | NAKINA |
| 10 | DVLX | Duval Sales Corp. | Jan-75 | | NRHS |
| 11 | DVLX | Duval Corp. | added 7/78; 1/80; eliminated 4/85 | | NRHS |
| 12 | DVLX | Pennzoil Sulphur Co. | added 4/85; eliminated 4/92 | | NRHS |
| 13 | DVLX | Pennzoil Co. | added 4/92; 1/94; eliminated 4/96 | | NRHS |
| 14 | DVLX | Freeport Sulphur Co. | added 7/96 | | NRHS |
| 15 | DVLX | Freeport Sulphur Co., a Division of Freeport-McMoRan Resource Partners, Ltd. | eliminated 4/98 | | NRHS |
| 16 | DVLX | Freeport-McMoRan Sulphur Inc. | added 4/98; eliminated 1/99 | | NRHS |
| 17 | DVLX | Freeport-McMoRan Sulphur LLC | added 1/99; 7/2000 | | NRHS |
| 18 | DVLX | SULCOM, INC. [FREEPORT-MCRORAN SULPHUR COMPANY; PENNZOIL COMPANY; PENNZOIL SULPHUR CO.] | | | PWRC |
| 19 | DVLX | Duval Corporation (Freeport-McRo-Ran Sulphur) | | | RSRV |
| 20 | DVLX | SULCOM INC | | | SCAC4 |