| 28001 | T & A Resources LLC | Salyersville, KY 41465 | Oil Operator | Dec 2023 |
| 28002 | T & B Drilling, Inc | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 28003 | T & B Oil Company Inc | Ardmore, OK 73401-3709 | Oil & Gas Operator | Apr 2015 |
| 28004 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 28005 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 28006 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 28007 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 28008 | T & D Oil Co. | Victoria, KS 67671 | Oil Operator | Apr 1996 |
| 28009 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 28010 | T & D Oil LLC (Osage Only) | | Oil & Gas Operator | May 2026 |
| 28011 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 28012 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 28013 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 28014 | T & G Energy LLC | Dallas, TX 75230 | Oil Operator | Nov 2010 |
| 28015 | T & G Holding LLC | Pauls Valley, OK 73075-8663 | Oil & Gas Operator | Mar 2015 |
| 28016 | T & G Oil Operations LLC | | Oil Operator | Apr 2026 |
| 28017 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 28018 | T & I Petroleum Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2005 |
| 28019 | T & J Oil Production, L.L.C. | Lone Grove, OK 73443 | Oil & Gas Operator | May 2026 |
| 28020 | T & J Operating | Ada, OK 74821-1547 | Oil Operator | Feb 2012 |
| 28021 | T & K Oil Inc | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 28022 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 28023 | T & L Production | | Oil Operator | May 1987 |
| 28024 | T & L Production Company | | Oil Operator | Feb 1984 |
| 28025 | T & M Gauging | | Oil Operator | Oct 2006 |
| 28026 | T & M Oil & Royalty | Ada, OK 74820 | Oil & Gas Operator | Jun 2026 |
| 28027 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | Sep 2026 |
| 28028 | T & O Gas Co | | Oil Operator | May 2001 |
| 28029 | T & P Exploration | Addison, TX 75006 | Oil & Gas Operator | Aug 1993 |
| 28030 | T & P Oil & Gas, L.L.C. | Overland Park, KS 66212 | Oil Operator | Dec 2009 |
| 28031 | T & R Investments, Inc. | Borger, TX 79008 | Oil & Gas Operator | Nov 1995 |
| 28032 | T & R Oil Company, A General Partnership | Moline, KS 67353 | Oil Operator | Dec 2019 |
| 28033 | T & S Oil & Gas, LLC | Graham, TX 76450 | Gas Operator | Sep 2026 |
| 28034 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2025 |
| 28035 | T & T Contracting Dba Hulman Contracting, LLC | Rockfield, KY 42274 | Oil & Gas Operator | Dec 2024 |
| 28036 | T & T Oil Co. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2002 |
| 28037 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 28038 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | May 2026 |
| 28039 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 28040 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | May 2026 |
| 28041 | T B C Inc | Coweta, OK 74429 | Oil & Gas Operator | Apr 2020 |
| 28042 | T B Drilling Co | Moxahala, OH 43761 | Oil & Gas Operator | Dec 1998 |
| 28043 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Jun 2026 |
| 28044 | T Bar M Energy Resources LLC | Sapulpa, OK 74066 | Oil & Gas Operator | May 2026 |
| 28045 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 28046 | T C Production | | Oil Operator | May 1994 |
| 28047 | T D Cox Oil Corporation | | Oil & Gas Operator | May 2026 |
| 28048 | T D Energy Company Inc | Broken Arrow, OK 74011-3953 | Oil & Gas Operator | Feb 2015 |
| 28049 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Sep 2026 |
| 28050 | T E F Inc | Madill, OK 73446-6656 | Oil & Gas Operator | Jun 2026 |
| 28051 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | May 2026 |
| 28052 | T G & S Oil | Marietta, OK 73448 | Oil & Gas Operator | May 2026 |
| 28053 | T G T Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Apr 2026 |
| 28054 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 28055 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 28056 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 28057 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 28058 | T K Resources LLC | Gillette, WY 82716 | Oil & Gas Operator | Jul 2026 |
| 28059 | T L C Oil Inc | Seminole, OK 74868 | Oil & Gas Operator | Apr 2026 |
| 28060 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28061 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 28062 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 28063 | T T & T Inc | Shawnee, OK 74802-3694 | Oil & Gas Operator | Jan 1994 |
| 28064 | T W Clemons Operating Co., LLC | Minden, LA 71055 | Oil & Gas Operator | Sep 2026 |
| 28065 | T W Law LLC | Muskogee, OK 74403-6736 | Oil Operator | Mar 2026 |
| 28066 | T Willoughby, LLC | Ada, OK 74820 | Oil Operator | May 2026 |
| 28067 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 28068 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Sep 2026 |
| 28069 | T&T Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 28070 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 28071 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 28072 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 28073 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 28074 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 28075 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Sep 2026 |
| 28076 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 28077 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 28078 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 28079 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 28080 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 28081 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 28082 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 28083 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Sep 2026 |
| 28084 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Sep 2026 |
| 28085 | T. A. Atkinson Opr. | | Gas Operator | Dec 1997 |
| 28086 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Sep 2026 |
| 28087 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Sep 2026 |
| 28088 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 28089 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 28090 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Dec 2025 |
| 28091 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 28092 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 28093 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 28094 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 28095 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 28096 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 28097 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 28098 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 28099 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 28100 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |