| 1 | HMFX | Vulcan Materials Co. | added 4/2008? | | NAKINA |
| 2 | HMFX | Florida Rock Industries, Inc. | added 4/1977; 1/1980; eliminated 5/1983; 1/1994-7/2005 (not listed) | | NAKINA |
| 3 | HMFX | Century Industries | added 10/1971; 1/1975; eliminated 4/1977 | | NAKINA |
| 4 | HMFX | Century Industries | added 10/71; 1/75 | | NRHS |
| 5 | HMFX | Florida Rock Industries, Inc. | 1/80; eliminated 5/83; 1/94-7/2000 | | NRHS |
| 6 | HMFX | *FLORIDA ROCK INDUSTRIES, INC. [CENTURY INDUSTRIES] | | | PWRC |
| 7 | HMFX | +VULCAN MATERIALS CO., CONSTRUCTION MATERIALS GROUP | | | PWRC |
| 8 | HMFX | Florida Rock Industries (Vulcan Materials) | | | RSRV |
| 9 | HMFX | VULCAN MATERIALS COMPANY CONSTRUCTI | | | SCAC4 |
| 10 | HMFX | Century Industries | | USA | TRAFFIC |
