| 27901 | T & J Operating | Ada, OK 74821-1547 | Oil Operator | Feb 2012 |
| 27902 | T & K Oil Inc | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 27903 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 27904 | T & L Production | | Oil Operator | May 1987 |
| 27905 | T & L Production Company | | Oil Operator | Feb 1984 |
| 27906 | T & M Gauging | | Oil Operator | Oct 2006 |
| 27907 | T & M Oil & Royalty | Ada, OK 74820 | Oil & Gas Operator | Mar 2026 |
| 27908 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | Jun 2026 |
| 27909 | T & O Gas Co | | Oil Operator | May 2001 |
| 27910 | T & P Exploration | Addison, TX 75006 | Oil & Gas Operator | Aug 1993 |
| 27911 | T & P Oil & Gas, L.L.C. | Overland Park, KS 66212 | Oil Operator | Dec 2009 |
| 27912 | T & R Investments, Inc. | Borger, TX 79008 | Oil & Gas Operator | Nov 1995 |
| 27913 | T & R Oil Company, A General Partnership | Moline, KS 67353 | Oil Operator | Dec 2019 |
| 27914 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2025 |
| 27915 | T & T Contracting Dba Hulman Contracting, LLC | Rockfield, KY 42274 | Oil & Gas Operator | Dec 2024 |
| 27916 | T & T Oil Co. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2002 |
| 27917 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 27918 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | Mar 2026 |
| 27919 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 27920 | T And DS Lube Doctors LLC | Carlsbad, NM 88220 | Gas Operator | Mar 2026 |
| 27921 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | Feb 2026 |
| 27922 | T And S Exploration LLC | | Oil Operator | Feb 2026 |
| 27923 | T B C Inc | Coweta, OK 74429 | Oil & Gas Operator | Apr 2020 |
| 27924 | T B Drilling Co | Moxahala, OH 43761 | Oil & Gas Operator | Dec 1998 |
| 27925 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Feb 2026 |
| 27926 | T Bar M Energy Resources LLC | Sapulpa, OK 74066 | Oil & Gas Operator | Feb 2026 |
| 27927 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 27928 | T C Production | | Oil Operator | May 1994 |
| 27929 | T D Cox Oil Corporation | | Oil & Gas Operator | Feb 2026 |
| 27930 | T D Energy Company Inc | Broken Arrow, OK 74011-3953 | Oil & Gas Operator | Feb 2015 |
| 27931 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Jun 2026 |
| 27932 | T E F Inc | Madill, OK 73446-6656 | Oil & Gas Operator | Jul 2023 |
| 27933 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Feb 2026 |
| 27934 | T G & S Oil | Marietta, OK 73448 | Oil & Gas Operator | Feb 2026 |
| 27935 | T G T Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Feb 2026 |
| 27936 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 27937 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 27938 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 27939 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 27940 | T K Resources LLC | Gillette, WY 82716 | Oil & Gas Operator | Mar 2026 |
| 27941 | T L C Oil Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 27942 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 27943 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 27944 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 27945 | T T & T Inc | Shawnee, OK 74802-3694 | Oil & Gas Operator | Jan 1994 |
| 27946 | T W Clemons Operating Co., LLC | Minden, LA 71055 | Oil & Gas Operator | Jun 2026 |
| 27947 | T W Law LLC | Muskogee, OK 74403-6736 | Oil Operator | Jan 2026 |
| 27948 | T Willoughby, LLC | Ada, OK 74820 | Oil Operator | Feb 2026 |
| 27949 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 27950 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 27951 | T&T Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 27952 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 27953 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 27954 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 27955 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 27956 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 27957 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Jun 2026 |
| 27958 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 27959 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 27960 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 27961 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 27962 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 27963 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 27964 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 27965 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Jun 2026 |
| 27966 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 27967 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jun 2026 |
| 27968 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Jun 2026 |
| 27969 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 27970 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 27971 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Dec 2025 |
| 27972 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 27973 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 27974 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 27975 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 27976 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 27977 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 27978 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 27979 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 27980 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 27981 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 27982 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Mar 2026 |
| 27983 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 27984 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 27985 | T. W. Drilling Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2002 |
| 27986 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 27987 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 27988 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 27989 | T.C. Harris Pumping LLC | Hennessey, OK 73742 | Gas Operator | Feb 2026 |
| 27990 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 27991 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 27992 | T.D. Operating Company, Inc. | New Braunfels, TX 78130 | Oil & Gas Operator | Nov 1999 |
| 27993 | T.F. Well Service, L.L.C. | Oklahoma City, OK 73162 | Oil Operator | Jun 2026 |
| 27994 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 27995 | T.J. Oil | | Oil Operator | Feb 2026 |
| 27996 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | Jun 2026 |
| 27997 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 27998 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 27999 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 28000 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Mar 2026 |