| 1 | TNGX | Texas Natural Gasoline Corp. | 1/1952-10/1957; eliminated 7/1960 | | NAKINA |
| 2 | TNGX | Union Texas Natural Gas Corp. | added 7/1960; 4/1961; eliminated 7/1962 | | NAKINA |
| 3 | TNGX | Union Texas Petroleum, a Division of Allied Chemical Corp. | added 7/1962; eliminated 7/1964 | | NAKINA |
| 4 | TNGX | Texas Natural Gasoline Corp. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 5 | TNGX | Union Texas Natural Gas Corp. | added 7/60; 4/61 | | NRHS |
| 6 | TNGX | Union Texas Petroleum, a Division of Allied Chemical Corp. | eliminated 7/64 | | NRHS |
| 7 | TNGX | UNION TEXAS DIV., ALLIED CHEMICAL CORP. [TEXAS NATURAL GASOLINE CORP.] | | | PWRC |
