| 1 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 2 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 3 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 4 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 5 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 6 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 7 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2023 |
| 8 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Oct 2004 |
| 9 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 10 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 11 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 12 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2024 |
| 13 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 14 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 15 | Texas Crude Oil Co. Et Al | | Oil & Gas Operator | May 1992 |
| 16 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 17 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 18 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 19 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 20 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 21 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 22 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 23 | The Exploration Co. Of La, Inc | | Oil & Gas Operator | Nov 1987 |
| 24 | The George R Brown Partnership | | Oil & Gas Operator | Jun 1992 |
| 25 | The Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 26 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 27 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 28 | The Southern Louisiana Expl. Company LLC | | Oil & Gas Operator | Dec 2023 |
| 29 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 30 | The Superior Oil Co & Pel-Tex | | Oil & Gas Operator | Apr 1986 |
| 31 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Feb 2024 |
| 32 | Toce Energy, L.L.C. | | Oil & Gas Operator | Dec 2017 |
| 33 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 34 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Apr 2024 |
| 35 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 36 | Torrid Energy Company | | Oil & Gas Operator | Jun 1988 |
| 37 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 38 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 39 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 40 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 41 | Trigon Exploration, Inc. | | Oil & Gas Operator | Jan 1999 |
| 42 | Triumph Energy Inc-P B Berry | | Oil & Gas Operator | Jun 1986 |
| 43 | Triumph Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 44 | Trunkline Gas Company | | Oil Operator | Mar 2008 |
| 45 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 46 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |