| 1 | T & A Resources LLC | Salyersville, KY 41465 | Oil Operator | Dec 2023 |
| 2 | T & B Drilling, Inc | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 3 | T & B Oil Company Inc | Ardmore, OK 73401-3709 | Oil & Gas Operator | Apr 2015 |
| 4 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 5 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 6 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 7 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 8 | T & D Oil Co. | Victoria, KS 67671 | Oil Operator | Apr 1996 |
| 9 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 10 | T & D Oil LLC (Osage Only) | | Oil & Gas Operator | Apr 2025 |
| 11 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2024 |
| 12 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 13 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 14 | T & G Energy LLC | Dallas, TX 75230 | Oil Operator | Nov 2010 |
| 15 | T & G Holding LLC | Pauls Valley, OK 73075-8663 | Oil & Gas Operator | Mar 2015 |
| 16 | T & G Oil Operations LLC | | Oil Operator | Jun 2025 |
| 17 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 18 | T & I Petroleum Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2005 |
| 19 | T & J Oil Production, L.L.C. | Lone Grove, OK 73443 | Oil & Gas Operator | Jun 2025 |
| 20 | T & J Operating | Ada, OK 74821-1547 | Oil Operator | Feb 2012 |
| 21 | T & K Oil, Inc | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 22 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 23 | T & L Production | | Oil Operator | May 1987 |
| 24 | T & L Production Company | | Oil Operator | Feb 1984 |
| 25 | T & M Gauging | | Oil Operator | Oct 2006 |
| 26 | T & M Oil & Royalty | Ada, OK 74820 | Oil Operator | Feb 2012 |
| 27 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | Oct 2025 |
| 28 | T & O Gas Co | | Oil Operator | May 2001 |
| 29 | T & P Exploration | Addison, TX 75006 | Oil & Gas Operator | Aug 1993 |
| 30 | T & P Oil & Gas, L.L.C. | Overland Park, KS 66212 | Oil Operator | Dec 2009 |
| 31 | T & R Investments, Inc. | Borger, TX 79008 | Oil & Gas Operator | Nov 1995 |
| 32 | T & R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 33 | T & R Oil Company, A General Partnership | Moline, KS 67353 | Oil Operator | Dec 2019 |
| 34 | T & S Oil & Gas, LLC | Graham, TX 76450 | Gas Operator | Oct 2025 |
| 35 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2024 |
| 36 | T & T Contracting Dba Hulman Contracting, LLC | Rockfield, KY 42274 | Oil & Gas Operator | Dec 2023 |
| 37 | T & T Oil Co. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2002 |
| 38 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 39 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | Jun 2025 |
| 40 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 41 | T And DS Lube Doctors LLC | Carlsbad, NM 88220 | Gas Operator | Aug 2025 |
| 42 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | Jul 2025 |
| 43 | T And S Exploration LLC | | Oil Operator | Jun 2025 |
| 44 | T B C Inc | Coweta, OK 74429 | Oil & Gas Operator | Apr 2020 |
| 45 | T B Drilling Co | Moxahala, OH 43761 | Oil & Gas Operator | Dec 1998 |
| 46 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Jul 2025 |
| 47 | T Bar M Energy Resources LLC | Mounds, OK 74047 | Oil & Gas Operator | Jun 2025 |
| 48 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 49 | T C Production | | Oil Operator | May 1994 |
| 50 | T D Cox Oil Corporation | | Oil & Gas Operator | Jun 2025 |
| 51 | T D Energy Company Inc | Broken Arrow, OK 74011-3953 | Oil & Gas Operator | Feb 2015 |
| 52 | T Dozer D Oil Co. | Goree, TX 76363 | Oil & Gas Operator | Oct 2025 |
| 53 | T E F Inc | Madill, OK 73446-6656 | Oil & Gas Operator | Jul 2023 |
| 54 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Jun 2025 |
| 55 | T G & S Oil | Marietta, OK 73448 | Oil & Gas Operator | Apr 2025 |
| 56 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 57 | T I Energy Services Inc | | Oil & Gas Operator | Dec 2003 |
| 58 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 59 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 60 | T J Water Works, A Texas LLC | Ballinger, TX 76821 | Oil & Gas Operator | Oct 2025 |
| 61 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 62 | T L C Oil Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 63 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 64 | T P Operating LLC | | Oil & Gas Operator | Nov 1999 |
| 65 | T P Production Co | Denver, CO 80202 | Oil & Gas Operator | Nov 1996 |
| 66 | T S B T Oil & Gas Properties | Moore, OK 73160-8126 | Oil & Gas Operator | Jan 2018 |
| 67 | T T & T Inc | Shawnee, OK 74802-3694 | Oil & Gas Operator | Jan 1994 |
| 68 | T W Clemons Operating Co., LLC | Minden, LA 71055 | Oil & Gas Operator | Oct 2025 |
| 69 | T W Law LLC | Muskogee, OK 74403-6736 | Oil Operator | Jun 2025 |
| 70 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 71 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 72 | T&T Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 73 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 74 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 75 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 76 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 77 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 78 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Oct 2025 |
| 79 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 80 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 81 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 82 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 83 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 84 | T-Rex Oil Inc | Broomfield, CO 80021 | Oil Operator | Feb 2011 |
| 85 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Oct 2025 |
| 86 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 87 | T. A. Atkinson Opr. | | Gas Operator | Dec 1997 |
| 88 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Oct 2025 |
| 89 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Oct 2025 |
| 90 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 91 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 92 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Jul 2025 |
| 93 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 94 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 95 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 96 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 97 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 98 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 99 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 100 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |