| 1 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 2 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 3 | T & D Oil Co. | Victoria, KS 67671 | Oil Operator | Apr 1996 |
| 4 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 5 | T & G Oil Operations LLC | | Oil Operator | Sep 2025 |
| 6 | T & L Production | | Oil Operator | May 1987 |
| 7 | T & P Oil & Gas, L.L.C. | Overland Park, KS 66212 | Oil Operator | Dec 2009 |
| 8 | T & R Oil Company, A General Partnership | Moline, KS 67353 | Oil Operator | Dec 2019 |
| 9 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | Nov 2025 |
| 10 | T C Production | | Oil Operator | May 1994 |
| 11 | T G T Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Sep 2025 |
| 12 | T J D Oil Compan | | Oil Operator | Feb 1989 |
| 13 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 14 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 15 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 16 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 17 | T. T. Production, Inc. | Haviland, KS 67059 | Oil & Gas Operator | Feb 2008 |
| 18 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 19 | T.C.G. Oil Co., A General Partnership | Laharpe, KS 66755 | Oil Operator | Aug 2009 |
| 20 | T.J. Oil | | Oil Operator | Sep 2025 |
| 21 | Taft Oil And Gas LLC | Bonham, TX 75418 | Oil & Gas Operator | Dec 2018 |
| 22 | Tailwater, Inc. | Oklahoma City, OK 73154 | Oil Operator | Aug 2024 |
| 23 | Talley Resources | | Oil Operator | Jun 1994 |
| 24 | Tallgrass Explor | | Oil Operator | Sep 1987 |
| 25 | Talon Group LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 26 | Tamoil | | Oil Operator | May 2017 |
| 27 | Tanner, M.B. | Moline, KS 67353 | Oil Operator | Apr 1986 |
| 28 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 29 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Dec 2025 |
| 30 | Targa Pipeline Mid-Continent Westok LLC | Sulphur, LA 70665 | Gas Operator | Sep 2025 |
| 31 | Tasl Petroleum | Borger, TX 79007 | Oil & Gas Operator | Feb 1991 |
| 32 | Tate Exploration | Lakin, KS 67860 | Oil & Gas Operator | Sep 1994 |
| 33 | Taurus Oil Compa | | Oil Operator | Oct 1994 |
| 34 | Tauy Oil, Inc | Baldwin City, KS 66006 | Oil Operator | Aug 2025 |
| 35 | Taylor Explorati | | Oil & Gas Operator | Jun 1985 |
| 36 | Taylor Florence | | Oil Operator | Mar 1995 |
| 37 | Taylor Oil Company | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 38 | Taylor-Brown Ope | | Oil Operator | Sep 1988 |
| 39 | Taylor-Cranor Oi | | Oil Operator | Dec 1987 |
| 40 | Tdi, Inc. | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 41 | Tdot Oil, Inc. | Sedan, KS 67361 | Oil Operator | Sep 2025 |
| 42 | TDR Construction, Inc. | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 43 | Te-Pe Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 44 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Nov 2025 |
| 45 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 46 | Tec Drilling Com | | Oil Operator | Feb 1982 |
| 47 | Tec Resources LLC | Tulsa, OK 74128 | Oil & Gas Operator | May 2013 |
| 48 | Tech American Re | | Oil Operator | Sep 1985 |
| 49 | Teg Midcontinent, Inc. | Aurora, CO 80014 | Oil Operator | Jul 2013 |
| 50 | Tehi Illinois, LLC | Olney, IL 62450 | Oil & Gas Operator | Feb 2019 |
| 51 | Teichgraeber Oil | | Oil Operator | Nov 1995 |
| 52 | Teichgraeber Oil Co. | | Oil Operator | Dec 1994 |
| 53 | Teichgraeber Oil, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Dec 2024 |
| 54 | Tekenergy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 55 | Teko Oil & Gas I | | Oil Operator | Aug 1992 |
| 56 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 57 | Tema Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2009 |
| 58 | Temple & Roark | | Oil & Gas Operator | Sep 1981 |
| 59 | Tenex Oil Corpor | | Oil Operator | May 1991 |
| 60 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Sep 2025 |
| 61 | Tenison Oil Comp | | Oil Operator | Jan 1993 |
| 62 | Tenk, Lawrence O. | Ottawa, KS 66067 | Oil & Gas Operator | Oct 1998 |
| 63 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 64 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 65 | Terra Max Energy | | Oil Operator | Mar 1986 |
| 66 | Terra Resc Incor | | Oil Operator | Mar 1986 |
| 67 | Terrol Energy In | | Oil Operator | Feb 1993 |
| 68 | Terrol Energy Incorporated | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 69 | Tesoro Petroleum | | Oil Operator | Mar 1982 |
| 70 | Tet Energy | | Oil Operator | Aug 2025 |
| 71 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 72 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 73 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 74 | Texaco USA - Mor | | Oil Operator | Aug 1988 |
| 75 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 76 | Texas Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 77 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 78 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 79 | Texas/Arkansas P | | Oil & Gas Operator | Sep 1990 |
| 80 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |
| 81 | Texkan Resources, LLC | Odessa, TX 79765 | Oil & Gas Operator | Jun 2025 |
| 82 | Texokan Energy C | | Oil Operator | Nov 1986 |
| 83 | Texokan Resources, Inc. | Dallas, TX 75206 | Oil Operator | Apr 2012 |
| 84 | TGT Petroleum Co | | Oil & Gas Operator | Apr 1995 |
| 85 | Tharp Oil, A General Partnership | Chanute, KS 66720 | Oil Operator | Mar 2014 |
| 86 | The Bill Bowman Oil Company | | Oil Operator | Sep 2025 |
| 87 | The Pyramid Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2009 |
| 88 | The Raven Company LLC | Granbury, TX 76049 | Oil Operator | Mar 2010 |
| 89 | The Sylvester Oil Co, LLC | League City, TX 77573 | Oil Operator | Aug 2025 |
| 90 | The Trees Oil Company | Wichita, KS 67208 | Oil & Gas Operator | Nov 2014 |
| 91 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Nov 2025 |
| 92 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Sep 2025 |
| 93 | Thomas M. Brown LLC | Plainville, KS 67663 | Oil Operator | Sep 2025 |
| 94 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 95 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Sep 2025 |
| 96 | Thomas, Vernon C. | Gardner, KS 66030 | Oil Operator | Jun 2015 |
| 97 | Thomason Oil Com | | Oil Operator | Oct 1984 |
| 98 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 99 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 100 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Nov 2025 |