| 1 | RGCX | Rio Grande Chemical Ltd. | added 7/2004; 7/2005 | | NAKINA |
| 2 | RGCX | Rio Grande Chemical Sales Co. | added 4/1979; 1/1980-7/2000; eliminated 7/2004 | | NAKINA |
| 3 | RGCX | Riverside Gas Co. | added 1/1965; 7/1965; eliminated 10/1966; 10/1966 (not listed) | | NAKINA |
| 4 | RGCX | The Roth Gasoline Corp. | 8/1920-7/1923 | | NAKINA |
| 5 | RGCX | Riverside Gas Co. | added 1/65; 7/65; eliminated 10/66 | | NRHS |
| 6 | RGCX | Rio Grande Chemical Sales Co. | added 4/79; 1/80-7/2000 | | NRHS |
| 7 | RGCX | *RIVERSIDE GAS CO. | | | PWRC |
| 8 | RGCX | +RIO GRANDE CHEMICAL LTD. | | | PWRC |
| 9 | RGCX | Rio Grande Chemical Sales | | | RSRV |
| 10 | RGCX | RIVERSIDE GAS CO, THE | | | SCAC3 |
| 11 | RGCX | RIO GRANDE CHEMICAL SALES CO | | | SCAC4 |