| 27901 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 27902 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 27903 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 27904 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 27905 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 27906 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 27907 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | May 2026 |
| 27908 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | May 2026 |
| 27909 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | May 2026 |
| 27910 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | May 2026 |
| 27911 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 27912 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 27913 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Dec 2025 |
| 27914 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 27915 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 27916 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 27917 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 27918 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 27919 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 27920 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 27921 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 27922 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 27923 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 27924 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Mar 2026 |
| 27925 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 27926 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 27927 | T. W. Drilling Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2002 |
| 27928 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 27929 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 27930 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 27931 | T.C. Harris Pumping LLC | Hennessey, OK 73742 | Gas Operator | Feb 2026 |
| 27932 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 27933 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 27934 | T.D. Operating Company, Inc. | New Braunfels, TX 78130 | Oil & Gas Operator | Nov 1999 |
| 27935 | T.F. Well Service, L.L.C. | Oklahoma City, OK 73162 | Oil Operator | May 2026 |
| 27936 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 27937 | T.J. Oil | | Oil Operator | Dec 2025 |
| 27938 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | May 2026 |
| 27939 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 27940 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 27941 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 27942 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Mar 2026 |
| 27943 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 27944 | Tab Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2026 |
| 27945 | Tabbs Bay Production Company | Houston, TX 77019 | Oil Operator | May 2026 |
| 27946 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 27947 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |
| 27948 | Taber Oil Co | | Oil Operator | Sep 2018 |
| 27949 | Taber, Alan R. | La Vernia, TX 78121 | Oil Operator | May 2026 |
| 27950 | Taber, Grover E. Jr. | Cocoa, FL 32926 | Gas Operator | Dec 2024 |
| 27951 | Tabor Creek Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2026 |
| 27952 | Tabor, Danny | Scottsville, KY 42164 | Oil Operator | Dec 2023 |
| 27953 | Tabula Rasa Energy, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2020 |
| 27954 | Tacitus, LLC | Farmington, NM 87401 | Oil & Gas Operator | Apr 2026 |
| 27955 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 27956 | Tackett & Sons DRLG Contractors, Inc | Salyersville, , K 41465 | Oil & Gas Operator | Dec 2024 |
| 27957 | Tacoma Operating LLC | Midland, TX 79707 | Oil & Gas Operator | May 2026 |
| 27958 | Tacor Resources Inc | Midland, TX 79705 | Oil & Gas Operator | May 2026 |
| 27959 | Tactical Oil & Gas, LLC | Odessa, TX 79768 | Oil & Gas Operator | May 2026 |
| 27960 | Tactical Operating Company, LLC | Houston, TX 77042 | Oil & Gas Operator | May 2026 |
| 27961 | Tadlock Properites | | Oil & Gas Operator | Jan 1994 |
| 27962 | Taft Investment Co., Inc. | Taft, TX 78390 | Oil Operator | May 2026 |
| 27963 | Taft Oil And Gas LLC | Bonham, TX 75418 | Oil & Gas Operator | Dec 2018 |
| 27964 | Tag Enterprises Inc | Shelocta, PA 15774-0310 | Gas Operator | Dec 2016 |
| 27965 | Tag Oil | La Vernia, TX 78121 | Oil Operator | May 2026 |
| 27966 | Tag Oil Co LLC | Ringling, OK 73456 | Oil & Gas Operator | Mar 2026 |
| 27967 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | May 2026 |
| 27968 | Tag Petroleum Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jan 2021 |
| 27969 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2026 |
| 27970 | Taggart Oil Co., Inc. | | Oil Operator | Oct 1992 |
| 27971 | Tahiti PTRS Enrgy Solutions Corp | Long Beach, CA 90807 | Oil Operator | May 2026 |
| 27972 | Tahoe Corporation | | Gas Operator | Feb 2023 |
| 27973 | Tahoe Energy, Inc. | Midland, TX 79703 | Oil & Gas Operator | Jul 1996 |
| 27974 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 27975 | Tai Inc Dba Trendwell Antrim Inc | | Gas Operator | Feb 2026 |
| 27976 | Tailwater, Inc. | Oklahoma City, OK 73154 | Oil Operator | Aug 2024 |
| 27977 | Takacs, Ray W. | North Huntington, PA 15642 | Gas Operator | Dec 2024 |
| 27978 | Tal-Con, Inc. | Houston, TX 77279 | Oil & Gas Operator | May 2026 |
| 27979 | Tala Energy LLC | College Sta, TX 77842 | Oil & Gas Operator | May 2026 |
| 27980 | Talaria Oil & Gas LLC | Denver, CO 80203 | Oil Operator | May 2026 |
| 27981 | Talbert, Eugene Operating Co,Inc | Tyler, TX 75702 | Oil & Gas Operator | Dec 1997 |
| 27982 | Talbott Oil & Gas Co | Tuppers Plains, OH 45783 | Oil & Gas Operator | Dec 2000 |
| 27983 | Talbott, Stan C. | Midland, TX 79701 | Oil & Gas Operator | Feb 2005 |
| 27984 | Talbott, WM G | Albany, KY 42602 | Oil Operator | Dec 2022 |
| 27985 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 27986 | Taleeho Energy Co. | Normangee, TX 77871 | Oil & Gas Operator | Jun 2003 |
| 27987 | Talis Energy Inc. | Austin, TX 78731 | Oil & Gas Operator | May 2026 |
| 27988 | Talisman Energy USA Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | May 2016 |
| 27989 | Talisman Resources, Inc. | Argyle, TX 76226 | Oil & Gas Operator | Mar 1995 |
| 27990 | Tall City Operations III LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2023 |
| 27991 | Tall City Operations LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2016 |
| 27992 | Tall Dune Resources, LLC | Boerne, TX 78006 | Oil & Gas Operator | May 2026 |
| 27993 | Tallent, Edwin Miller | Albany, KY 42602 | Oil Operator | Dec 2023 |
| 27994 | Talley Resources | | Oil Operator | Jun 1994 |
| 27995 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 27996 | Talley, Don R. | Holliday, TX 76366 | Oil & Gas Operator | Jun 2002 |
| 27997 | Talley, W.T. | Olney, TX 76374 | Oil & Gas Operator | May 2005 |
| 27998 | Tallgrass Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | May 2026 |
| 27999 | Tallgrass Explor | | Oil Operator | Sep 1987 |
| 28000 | Tallgrass Petroleum Corporation | | Oil & Gas Operator | Feb 2012 |