| 1 | Abercrombie A L | | Oil & Gas Operator | Nov 1995 |
| 2 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Mar 2025 |
| 3 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Apr 2025 |
| 4 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 5 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 6 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 7 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 8 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 9 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | May 2025 |
| 10 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 11 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 12 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 13 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 14 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Jul 2025 |
| 15 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 16 | Bear Petroleum LLC | Haysville, KS 67060 | Oil & Gas Operator | Mar 2025 |
| 17 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 18 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 19 | Bitter Spar LLC | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 20 | Black Oak Exploration, LLC | Denver, CO 80210 | Oil & Gas Operator | Mar 2025 |
| 21 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 22 | Bramble Oil Company | Wichita, KS 67206 | Oil & Gas Operator | Mar 2007 |
| 23 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 24 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 25 | Chesapeake Energy Ma | | Gas Operator | Jun 2016 |
| 26 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 27 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 28 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 29 | City Of Hugoton, Kansas | Hugoton, KS 67951 | Gas Operator | Mar 2025 |
| 30 | Claassen Oil And Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Mar 2025 |
| 31 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 32 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 33 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 34 | Cross Timbers Op | | Oil & Gas Operator | Nov 1996 |
| 35 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 36 | Crown Consulting, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Mar 2025 |
| 37 | Cullison, Jimmie I. | Moscow, KS 67952 | Oil Operator | Apr 2002 |
| 38 | Damson Oil Corpo | | Oil & Gas Operator | May 1994 |
| 39 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Apr 2025 |
| 40 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 41 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 42 | Dorchester Hugot | | Gas Operator | Sep 1993 |
| 43 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 44 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 45 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 46 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 47 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 48 | Enterra Resources, LLC | Edmond, OK 73083 | Oil & Gas Operator | Mar 2025 |
| 49 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 50 | Extreme Energy Co | | Oil & Gas Operator | Mar 2025 |
| 51 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 52 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 53 | Flynn Energy Cor | | Oil & Gas Operator | Mar 1992 |
| 54 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 55 | Foxfire Explorat | | Oil Operator | Dec 1986 |
| 56 | Gear Petroleum Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2009 |
| 57 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 58 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 59 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 60 | Herman L. Loeb, LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Mar 2025 |
| 61 | Hope Company, LLC | Longmont, CO 80502 | Gas Operator | Feb 2012 |
| 62 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 63 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 64 | Kansas Natural Gas Operating, LC | Hays, KS 67601 | Gas Operator | Mar 2025 |
| 65 | KBW Oil & Gas Co | Kiowa, KS 67070 | Oil & Gas Operator | Jul 2024 |
| 66 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 67 | Kuhn Walter Dril | | Gas Operator | Dec 1985 |
| 68 | Ladd Petroleum C | | Oil & Gas Operator | Sep 1989 |
| 69 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 70 | Leasing & Develo | | Oil & Gas Operator | Feb 1993 |
| 71 | Lebosquet Gas Operations, LLC | Wichita, KS 67202 | Gas Operator | Mar 2025 |
| 72 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 73 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jul 2025 |
| 74 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 75 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 76 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2025 |
| 77 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Mar 2025 |
| 78 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 79 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Jun 2025 |
| 80 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 81 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 82 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 83 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 84 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Mar 2025 |
| 85 | Midwestern Exploration Co. | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 86 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 87 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 88 | Mohawk Petroleum | | Oil & Gas Operator | Jan 1995 |
| 89 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 90 | N H Wheless Oil Company | Shreveport, LA 71101 | Gas Operator | Sep 2002 |
| 91 | N.L.S., Inc. | Kimberling City, MO 65686 | Oil & Gas Operator | Aug 2016 |
| 92 | Northern Natural Gas Prod | | Gas Operator | Oct 1989 |
| 93 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 94 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 95 | Oneok Bushton Proces | | Gas Operator | Mar 2007 |
| 96 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 97 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 98 | Palmer Oil, Inc. | Garden City, KS 67846 | Oil & Gas Operator | Mar 2025 |
| 99 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 100 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2025 |