| 1 | Adelaide Energy, Inc. | | Oil Operator | May 2022 |
| 2 | Altavista Energy, Inc. | Wellsville, KS 66092 | Oil Operator | Jan 2026 |
| 3 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |
| 4 | Bauer Oil Investment LLC | Cleveland, MO 64734 | Oil Operator | Jan 2026 |
| 5 | Brant Energy LLC | Rantoul, KS 66079 | Oil Operator | Apr 2022 |
| 6 | Camio Oil Co. | | Oil Operator | Dec 2004 |
| 7 | Carmel Energy, Inc. | | Oil Operator | Dec 2009 |
| 8 | Carter-Waters Corp. | | Oil Operator | Dec 1988 |
| 9 | Chemical Bioteck Solutions LLC | | Oil Operator | Sep 2021 |
| 10 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 11 | Coastal Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 12 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jan 2026 |
| 13 | Continental Exploration, Inc. | | Oil Operator | Dec 2001 |
| 14 | D. E. Exploration, Inc. | Wellsville, KS 66092 | Oil & Gas Operator | Jan 2026 |
| 15 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 16 | Delphi International, Inc. | Tulsa, OK 74104 | Oil Operator | Feb 2026 |
| 17 | Dotson, Floyd | | Oil Operator | Dec 1980 |
| 18 | Emery Energy, Inc. | | Oil Operator | Dec 1984 |
| 19 | Fell, Clarence | | Gas Operator | Dec 1972 |
| 20 | Fell-Brecklein-Town Oil Co. | | Oil Operator | Dec 1975 |
| 21 | General Energy, Inc. | | Oil Operator | Dec 1983 |
| 22 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 23 | Hardee Oil Co. | | Oil Operator | Dec 1994 |
| 24 | Interstate Gas Co. | | Gas Operator | Dec 1941 |
| 25 | James K. Anderson, Inc. | | Oil Operator | Dec 1999 |
| 26 | Jennings Drilling Co. | | Oil & Gas Operator | Dec 1997 |
| 27 | Jones-Blair Energy, Inc. | | Oil Operator | Dec 1987 |
| 28 | JTC Oil Inc. | Louisburg, KS 66053 | Oil Operator | Jan 2026 |
| 29 | Kan-Tex Drilling Corp. | | Oil Operator | Dec 1981 |
| 30 | Kansas Resource Exploration And Development | | Oil Operator | Apr 2022 |
| 31 | Ke-La-Da Enterprises, Inc. | | Oil Operator | Dec 1984 |
| 32 | Kent Resources Corp. | | Oil Operator | Dec 1983 |
| 33 | LT Oil Company | Midland, TX 79705 | Oil & Gas Operator | May 2026 |
| 34 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2026 |
| 35 | Mo-Ky | | Oil Operator | Dec 1982 |
| 36 | Mri Ventures, Inc. | | Oil Operator | Dec 1993 |
| 37 | Oil And Gas Management, Inc. | Kansas City, MO 64106 | Oil Operator | Apr 2011 |
| 38 | Osborn Energy, LLC | Bucyrus, KS 66013 | Oil & Gas Operator | Jul 2017 |
| 39 | Palo Chop Development LLC | | Oil Operator | Aug 2018 |
| 40 | Paluca Petroleum Inc | Holdenville, OK 74848 | Oil & Gas Operator | Feb 2026 |
| 41 | Pam-Ark Oil Producers | | Oil Operator | Dec 1985 |
| 42 | Pense Brothers Drilling | | Oil Operator | Dec 1998 |
| 43 | Prairie Resources Corp. | | Oil Operator | Dec 1989 |
| 44 | Pringle Operating Co. | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2015 |
| 45 | Reynolds Exploration Co. | | Oil Operator | Dec 1986 |
| 46 | Rhoden Investment Co. | | Oil Operator | Dec 1987 |
| 47 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Jan 2026 |
| 48 | S & B Operating, LLC | Iowa Park, TX 76367 | Oil Operator | May 2026 |
| 49 | SCZ Resources, LLC | Houston, TX 77055 | Oil Operator | Jan 2026 |
| 50 | Short, Dan | | Oil Operator | Dec 1963 |
| 51 | Spire Missouri Inc. | | Oil Operator | May 2022 |
| 52 | Spire Oil Services LLC | | Oil & Gas Operator | Nov 2020 |
| 53 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 54 | T-5 Leasing, LLC | | Oil Operator | Dec 2013 |
| 55 | Town Oil Co. | Paola, KS 66071 | Oil & Gas Operator | Jan 2026 |
| 56 | W.P. Moore, Inc. | | Oil Operator | Dec 1983 |
| 57 | Western Engineering, Inc. | | Oil Operator | Dec 1998 |