| 101 | Extreme Energy Co | | Oil & Gas Operator | Mar 2025 |
| 102 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 103 | Farris Well Service | | Oil & Gas Operator | Dec 2021 |
| 104 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 105 | Ferguson Orval L | | Oil & Gas Operator | Oct 1983 |
| 106 | First National O | | Oil & Gas Operator | Aug 1990 |
| 107 | First National Oil, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Apr 2025 |
| 108 | Flynn Energy Cor | | Oil & Gas Operator | Mar 1992 |
| 109 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 110 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 111 | Fritzler Resources Inc | Fort Morgan, CO 80701 | Oil & Gas Operator | Apr 2025 |
| 112 | Gamma Resources Inc. | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2017 |
| 113 | Glenn Supply Com | | Oil Operator | Apr 1989 |
| 114 | Global Natural R | | Oil & Gas Operator | Oct 1990 |
| 115 | Glori Holdings, Inc. | Houston, TX 77042 | Oil Operator | Mar 2004 |
| 116 | Great Plains Pet | | Oil & Gas Operator | Mar 1995 |
| 117 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2025 |
| 118 | Gruenerwald WM & | | Oil & Gas Operator | Apr 1994 |
| 119 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 120 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Mar 2025 |
| 121 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 122 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 123 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 124 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 125 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 126 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 127 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2025 |
| 128 | Herman L. Loeb, LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Mar 2025 |
| 129 | Herman Lang Oil And Gas Co. | | Oil & Gas Operator | Dec 1992 |
| 130 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Mar 2025 |
| 131 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Feb 2025 |
| 132 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Mar 2025 |
| 133 | High Point Produ | | Gas Operator | May 1996 |
| 134 | HJ, Inc. | Garden City, KS 67846 | Oil & Gas Operator | Mar 2025 |
| 135 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 136 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jul 2025 |
| 137 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 138 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |
| 139 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 140 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 141 | Hummon Corp. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 142 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 143 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 144 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jul 2025 |
| 145 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |
| 146 | Investors Drilli | | Gas Operator | Jan 1993 |
| 147 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 148 | JCS Operating LLC | Guymon, OK 73942 | Oil & Gas Operator | Apr 2025 |
| 149 | Jma Energy Company, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 150 | Jma Resources In | | Oil & Gas Operator | Sep 1995 |
| 151 | Jma Resources, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2025 |
| 152 | Kaiser-Francis O | | Oil & Gas Operator | Oct 1995 |
| 153 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 154 | Kennedy & Mitche | | Oil & Gas Operator | May 1990 |
| 155 | Kimbark Oil & Ga | | Oil & Gas Operator | Aug 1992 |
| 156 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 157 | Klima Well Service, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2025 |
| 158 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 159 | Lang Herman Oil | | Oil & Gas Operator | Dec 1996 |
| 160 | Lang, Herman - Marital Trust | Garden City, KS 67846 | Oil & Gas Operator | Mar 2025 |
| 161 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 162 | Leben Corp. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2011 |
| 163 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 164 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 165 | Lebosquet Gas Operations, LLC | Wichita, KS 67202 | Gas Operator | Mar 2025 |
| 166 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 167 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 168 | Lowry Exploratio | | Oil Operator | May 1994 |
| 169 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 170 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 171 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 172 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 173 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2025 |
| 174 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 175 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Jun 2025 |
| 176 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 177 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 178 | Merrico Resource | | Oil Operator | Dec 1996 |
| 179 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 180 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jul 2025 |
| 181 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 182 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Mar 2025 |
| 183 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 184 | Midwestern Exploration Co. | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 185 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 186 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 187 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 188 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 189 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |
| 190 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 191 | MW Oil, Inc | | Oil & Gas Operator | Mar 2025 |
| 192 | Nadel And Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 193 | Nadel And Gussman, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 194 | Nash Oil & Gas, Inc. | Newton, KS 67114 | Oil & Gas Operator | Mar 2025 |
| 195 | Newfield Exploration Mid-Continent Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2011 |
| 196 | Nichols Fluid Service, Inc. | Liberal, KS 67901 | Oil Operator | Jun 2019 |
| 197 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 198 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 199 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 200 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |