| 1 | 3G Production, LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 2 | A P X Corporatio | | Oil & Gas Operator | Nov 1992 |
| 3 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Sep 2025 |
| 4 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 5 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Oct 2025 |
| 6 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 7 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Nov 2025 |
| 8 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 9 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 10 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 11 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 12 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Dec 2025 |
| 13 | Banks Oil - Lee | | Oil & Gas Operator | Jun 1995 |
| 14 | Banks Oil Co | | Oil & Gas Operator | Sep 2025 |
| 15 | Bargo Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 16 | Beaver Oil Company, A General Partnership | Beaver, OK 73792 | Gas Operator | Aug 2022 |
| 17 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 18 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Oct 2025 |
| 19 | Becker, Clyde M. | Ponca City, OK 74601 | Oil & Gas Operator | Oct 2009 |
| 20 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 21 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 22 | Bentley & Laing | Wichita Falls, TX 76302 | Oil & Gas Operator | Feb 2002 |
| 23 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 24 | Berexco Inc. | Wichita, KS 67208 | Oil & Gas Operator | Oct 2009 |
| 25 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 26 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 27 | Black Oak Exploration, LLC | Denver, CO 80210 | Oil & Gas Operator | Sep 2025 |
| 28 | Blackhawk Exploration, Inc. | Wichita, KS 67214 | Oil & Gas Operator | May 2020 |
| 29 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 30 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 31 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 32 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 33 | Buttonwood Petro | | Oil & Gas Operator | Aug 1994 |
| 34 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 35 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 36 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 37 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 38 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 39 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 40 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 41 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Sep 2025 |
| 42 | Clayton Corp Petro & NTRL Gas Prodn | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2009 |
| 43 | Clifford Resourc | | Oil & Gas Operator | Mar 1989 |
| 44 | Clinton Producti | | Oil Operator | Dec 1989 |
| 45 | Cobra Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 46 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 47 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 48 | Cross Bar Petroleum, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Jun 2016 |
| 49 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 50 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 51 | Darrah Oil Company, LLC | Wichita, KS 67201 | Oil & Gas Operator | Dec 2025 |
| 52 | Daystar Petroleum Inc | Eureka, KS 67045 | Oil & Gas Operator | Sep 2025 |
| 53 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 54 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 55 | Diamond Chemicals Company | Amarillo, TX 79101 | Gas Operator | Jul 2001 |
| 56 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 57 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 58 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 59 | Eagle Creek Corporation | Andover, KS 67002 | Oil & Gas Operator | Sep 2025 |
| 60 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Dec 2025 |
| 61 | Eason Drilling & Services Co. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2005 |
| 62 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 63 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 64 | Empire Energy E & P, LLC | Mayville, NY 14757 | Oil & Gas Operator | Mar 2019 |
| 65 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Nov 2025 |
| 66 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 67 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 68 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 69 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 70 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 71 | Evans Energy, LLC | Mount Hope, KS 67108 | Oil & Gas Operator | Sep 2025 |
| 72 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 73 | Extreme Energy Co | | Oil & Gas Operator | Sep 2025 |
| 74 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 75 | Farmer John O Inc | Russell, KS 67665 | Oil & Gas Operator | Sep 2025 |
| 76 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Nov 2025 |
| 77 | Ferguson Orval L | | Oil & Gas Operator | Oct 1983 |
| 78 | First National O | | Oil & Gas Operator | Aug 1990 |
| 79 | Five Star Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Nov 2025 |
| 80 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 81 | Fox, Warren F. Family Trust | Plains, KS 67869 | Oil Operator | Jun 2016 |
| 82 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 83 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 84 | Getty Oil Compan | | Oil & Gas Operator | Jun 1992 |
| 85 | Giant Exploratio | | Oil & Gas Operator | Aug 1992 |
| 86 | Giant Exploration & Prod Co | Farmington, NM 87499 | Oil & Gas Operator | Dec 2009 |
| 87 | Graham-Michaelis | | Oil & Gas Operator | Nov 1996 |
| 88 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 89 | Great Plains Pet | | Oil & Gas Operator | Mar 1995 |
| 90 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Sep 2025 |
| 91 | Greer, Joseph V. | Yates Center, KS 66783 | Oil & Gas Operator | Oct 2005 |
| 92 | Gruenerwald WM & | | Oil & Gas Operator | Apr 1994 |
| 93 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 94 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 95 | H-30, Inc. | Wichita, KS 67202 | Gas Operator | Oct 2006 |
| 96 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 97 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 98 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 99 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 100 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |