| 1 | A P X Corporatio | | Oil & Gas Operator | Nov 1992 |
| 2 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Jun 2025 |
| 3 | Aladdin Petroleu | | Oil & Gas Operator | Nov 1995 |
| 4 | Altavista Energy, Inc. | Wellsville, KS 66092 | Oil Operator | Jun 2025 |
| 5 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Aug 2025 |
| 6 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 7 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 9 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 10 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 11 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 12 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 13 | Apex Operating Company, Inc. | Denver, CO 80202 | Gas Operator | Mar 2003 |
| 14 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 15 | Argent Energy, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 16 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2025 |
| 17 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Dec 2025 |
| 18 | Banks Oil - Lee | | Oil & Gas Operator | Jun 1995 |
| 19 | Barnes Hugoton C | | Gas Operator | Oct 1993 |
| 20 | Bear Petroleum LLC | Haysville, KS 67060 | Oil & Gas Operator | Jun 2025 |
| 21 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Oct 2025 |
| 22 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 23 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 24 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 25 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 26 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2025 |
| 27 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 28 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 29 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Sep 2025 |
| 30 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 31 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 32 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 33 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 34 | Chautauqua Oil And Gas LLC | Tulsa, OK 74145 | Oil & Gas Operator | Jun 2025 |
| 35 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 36 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 37 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 38 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Aug 2025 |
| 39 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 40 | Coastal Oil & Ga | | Oil & Gas Operator | Oct 1996 |
| 41 | Coastal Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 42 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 43 | Coats Energy, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2025 |
| 44 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Sep 2025 |
| 45 | Colorado Oil & G | | Oil & Gas Operator | Oct 1987 |
| 46 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jun 2025 |
| 47 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 48 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2025 |
| 49 | Cox Edwin L & Be | | Oil & Gas Operator | Nov 1989 |
| 50 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 51 | Davis, Robert W. | Richfield, KS 67953 | Gas Operator | Dec 2010 |
| 52 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 53 | DCP Midstream, LP | Denver, CO 80237 | Oil Operator | Nov 2006 |
| 54 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 55 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 56 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2024 |
| 57 | Eagle Exploratio | | Oil & Gas Operator | Oct 1991 |
| 58 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Jun 2025 |
| 59 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 60 | Elevate Energy LTD | Aurora, CO 80016 | Oil & Gas Operator | Jun 2025 |
| 61 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 62 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Dec 2025 |
| 63 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 64 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 65 | Enterra Resources, LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 66 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 67 | Extreme Energy Co | | Oil & Gas Operator | Jun 2025 |
| 68 | Exxon Corporatio | | Oil & Gas Operator | Dec 1995 |
| 69 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 70 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 71 | Ferguson Orval L | | Oil & Gas Operator | Oct 1983 |
| 72 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 73 | Fna Oil Company, LLC | Richfield, KS 67953 | Gas Operator | Jun 2025 |
| 74 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Sep 2025 |
| 75 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 76 | Graham-Michaelis | | Oil & Gas Operator | Nov 1996 |
| 77 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 78 | Hamilton Brother | | Gas Operator | May 1993 |
| 79 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 80 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 81 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 82 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Jun 2025 |
| 83 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Jun 2025 |
| 84 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 85 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2025 |
| 86 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 87 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 88 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 89 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 90 | Kansas Natural Gas Operating, LC | Hays, KS 67601 | Gas Operator | Jun 2025 |
| 91 | Kansas Natural Gas, Inc. | Hays, KS 67601 | Gas Operator | Jun 2025 |
| 92 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 93 | Kuhn Walter Dril | | Gas Operator | Dec 1985 |
| 94 | L B Industries Inc | Englewood, CO 80112 | Oil & Gas Operator | Jun 2003 |
| 95 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 96 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 97 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 98 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2025 |
| 99 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 100 | Lone Star Resources Company | Keyes, OK 73947 | Oil & Gas Operator | Mar 2015 |