| 1 | Adams G C Oil & | | Oil & Gas Operator | Nov 1996 |
| 2 | American Star Energy Services, LLC | Tulsa, OK 74152 | Gas Operator | Sep 2025 |
| 3 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Nov 2025 |
| 4 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 5 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 6 | Argonaut Energy | | Oil & Gas Operator | Aug 1991 |
| 7 | Arrow Oil & Gas, Inc. | Norman, OK 73070 | Oil Operator | Mar 2010 |
| 8 | Axem Resources I | | Oil Operator | Aug 1995 |
| 9 | Banks, R. C. | Midland, TX 79702 | Oil & Gas Operator | Apr 2016 |
| 10 | Bartling Oil Com | | Gas Operator | Dec 1992 |
| 11 | Bartling Oil Company | Austin, TX 78733 | Gas Operator | Jun 2017 |
| 12 | Benson Mineral G | | Oil & Gas Operator | Dec 1995 |
| 13 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 14 | Big Sky Gas Co. | Tribune, KS 67879 | Gas Operator | Dec 2001 |
| 15 | Bow Creek Oil Company, General Partnership | Hays, KS 67601 | Oil & Gas Operator | Feb 2017 |
| 16 | Brite Liquids, LLC | Cheyenne Wells, CO 80810 | Oil & Gas Operator | Dec 2011 |
| 17 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 18 | Brooks Range Corporation | Denver, CO 80209 | Gas Operator | Dec 2022 |
| 19 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Dec 2025 |
| 20 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 21 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 22 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 23 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 24 | Cycle Oil & Gas LTD | | Gas Operator | Sep 2025 |
| 25 | Damson Oil Corpo | | Oil & Gas Operator | May 1994 |
| 26 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 27 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 28 | Dorchester Explo | | Oil & Gas Operator | Dec 1984 |
| 29 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 30 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 31 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 32 | Gamma Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2017 |
| 33 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Sep 2025 |
| 34 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Sep 2025 |
| 35 | Horseshoe Operating Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 36 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Sep 2025 |
| 37 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 38 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Feb 2026 |
| 39 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 40 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 41 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 42 | Midwestern Exploration Company | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 43 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 44 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 45 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 46 | Par Petroleum In | | Oil & Gas Operator | Jun 1993 |
| 47 | Parker & Parsley | | Oil & Gas Operator | Dec 1996 |
| 48 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 49 | Plateau Operating Corporation | Nashville, TN 37205 | Gas Operator | Sep 2025 |
| 50 | Prairie Gas Operating, LLC | Tulsa, OK 74101 | Gas Operator | Dec 2019 |
| 51 | Red Oak Energy, Inc. | Wichita, KS 67207 | Oil & Gas Operator | Sep 2025 |
| 52 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Feb 2026 |
| 53 | Seewald, Hughes | Amarillo, TX 79105 | Gas Operator | Jan 1997 |
| 54 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 55 | Sharp Engineerin | | Oil Operator | Aug 1995 |
| 56 | Smith Cattle Inc | | Gas Operator | Dec 1994 |
| 57 | Smith Ranch Company | Sharon Springs, KS 67758 | Gas Operator | May 2002 |
| 58 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 59 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 60 | W. R. Williams, Inc. | Amarillo, TX 79105 | Gas Operator | Dec 2019 |
| 61 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Nov 2025 |
| 62 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 63 | Whitehall Energy Corp. | Houston, TX 77095 | Gas Operator | Apr 2010 |
| 64 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |