| 101 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Dec 2025 |
| 102 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 103 | HJ, Inc. | Garden City, KS 67846 | Oil & Gas Operator | Dec 2025 |
| 104 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 105 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2026 |
| 106 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 107 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 108 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2026 |
| 109 | Imperial Oil & G | | Gas Operator | Jan 1990 |
| 110 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 111 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2026 |
| 112 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 113 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 114 | JCS Operating LLC | Guymon, OK 73942 | Oil & Gas Operator | Jan 2026 |
| 115 | Jeffery Energy Corporation | Meade, KS 67864 | Gas Operator | Dec 2019 |
| 116 | Jo-Allyn Oil Co Inc | Laverne, OK 73848 | Oil & Gas Operator | Jan 2026 |
| 117 | Kaiser-Francis O | | Oil & Gas Operator | Oct 1995 |
| 118 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 119 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2026 |
| 120 | Kennedy & Mitche | | Oil & Gas Operator | May 1990 |
| 121 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | Jan 2026 |
| 122 | Kirkman W L Inco | | Oil & Gas Operator | Dec 1994 |
| 123 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 124 | L. D. Drilling, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 125 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 126 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 127 | Lang, Kenneth R. | Garden City, KS 67846 | Oil & Gas Operator | Dec 2025 |
| 128 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 129 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 130 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 131 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 132 | M & D Oil Co, A General Partnership | Beaver, OK 73932 | Gas Operator | Oct 2022 |
| 133 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Dec 2025 |
| 134 | Mach Petroleum, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | Nov 2014 |
| 135 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 136 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2026 |
| 137 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 138 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 139 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 140 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 141 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Dec 2025 |
| 142 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 143 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 144 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 145 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 146 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 147 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Dec 2025 |
| 148 | Midway Drilling | | Oil & Gas Operator | Dec 1996 |
| 149 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 150 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 151 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2013 |
| 152 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 153 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |
| 154 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 155 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2026 |
| 156 | Nash Oil & Gas, Inc. | Newton, KS 67114 | Oil & Gas Operator | Dec 2025 |
| 157 | Natural Gas Anadarko Company | Perryton, TX 79070 | Oil & Gas Operator | Apr 2026 |
| 158 | Nielson Enterpri | | Oil & Gas Operator | Sep 1987 |
| 159 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 160 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Apr 2026 |
| 161 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 162 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 163 | Oneok Exploratio | | Oil & Gas Operator | Mar 1995 |
| 164 | Oneok Gas Processing LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 165 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 166 | Oolite Energy Corp | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2022 |
| 167 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 168 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 169 | Par Petroleum In | | Oil & Gas Operator | Jun 1993 |
| 170 | Par Petroleum, Inc. | Liberal, KS 67901 | Gas Operator | Dec 2009 |
| 171 | Parwest Land Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2026 |
| 172 | Patrick R J Oper | | Oil & Gas Operator | Jan 1995 |
| 173 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 174 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 175 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 176 | Petrosantander (USA) Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2025 |
| 177 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 178 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 179 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2025 |
| 180 | Plum Creek Energy, LLC | Ellinwood, KS 67526 | Oil & Gas Operator | Dec 2025 |
| 181 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 182 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 183 | Presidio Petroleum LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2026 |
| 184 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 185 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 186 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Jan 2026 |
| 187 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2026 |
| 188 | Quinque Operatin | | Oil & Gas Operator | Jul 1994 |
| 189 | Quinque Operating Company | Liberal, KS 67905 | Oil & Gas Operator | Dec 2025 |
| 190 | Quintana Minerals Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2003 |
| 191 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2026 |
| 192 | R.C.Taylor Companies, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 193 | R.J. Patrick Operating Co. | | Oil & Gas Operator | Jun 2006 |
| 194 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 195 | Rains & Williamson Oil Co Inc | Wichita, KS 67277 | Oil & Gas Operator | Dec 2025 |
| 196 | Rama Operating C | | Oil & Gas Operator | Dec 1996 |
| 197 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Feb 2026 |
| 198 | Raw Energy Corporation Of Kansas | Weatherford, TX 76086 | Gas Operator | Dec 2019 |
| 199 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2026 |
| 200 | Red Hills Resources, Inc. | Englewood, KS 67840 | Oil & Gas Operator | Dec 2025 |