| 101 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 102 | Kansas Petroleum | | Oil & Gas Operator | Dec 1993 |
| 103 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 104 | Kiowa Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 2025 |
| 105 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 106 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 107 | Ladd Petroleum C | | Oil & Gas Operator | Sep 1989 |
| 108 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 109 | Lasso Energy LLC | Chase, KS 67524 | Oil & Gas Operator | Sep 2025 |
| 110 | Lear Petroleum E | | Oil & Gas Operator | Jan 1986 |
| 111 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 112 | Louis Dreyfus Natural Gas Corp. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2015 |
| 113 | Mach Petroleum, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | Nov 2014 |
| 114 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 115 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 116 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 117 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 118 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 119 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 120 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 121 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 122 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Dec 2025 |
| 123 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 124 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 125 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 126 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 127 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 128 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 129 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Sep 2025 |
| 130 | Mitchell Energy | | Oil & Gas Operator | Dec 1996 |
| 131 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Dec 2025 |
| 132 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Nov 2025 |
| 133 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 134 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 135 | Mustang Fuel Cor | | Oil & Gas Operator | Dec 1990 |
| 136 | National Coopera | | Oil & Gas Operator | Mar 1992 |
| 137 | National Crude O | | Oil & Gas Operator | Jun 1991 |
| 138 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 139 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Sep 2025 |
| 140 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Feb 2026 |
| 141 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 142 | Oil Property Man | | Oil & Gas Operator | Jun 1995 |
| 143 | Oleum Incorporat | | Gas Operator | Dec 1990 |
| 144 | Oneok Exploratio | | Oil & Gas Operator | Mar 1995 |
| 145 | Oryx Energy Comp | | Oil & Gas Operator | Apr 1991 |
| 146 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 147 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 148 | Palomino Petroleum | Newton, KS 67114 | Oil Operator | Oct 2003 |
| 149 | Parwest Land Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2025 |
| 150 | Paulsen Petroleu | | Oil Operator | Feb 1994 |
| 151 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 152 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Sep 2025 |
| 153 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 154 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 155 | Prospective Inv. & Trading Co., LTD., The | Tulsa, OK 74170 | Oil Operator | Dec 2019 |
| 156 | Prospective Invs | | Oil & Gas Operator | Jun 1994 |
| 157 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 158 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Nov 2025 |
| 159 | Quintana Petrole | | Oil & Gas Operator | Dec 1995 |
| 160 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 161 | R & B Oil & Gas Inc | Attica, KS 67009 | Oil & Gas Operator | Sep 2025 |
| 162 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 163 | Ramco Drilling S | | Oil & Gas Operator | Dec 1992 |
| 164 | Ramco Energy Corporation | FT. Lauderdale, FL 33312 | Oil & Gas Operator | Dec 2008 |
| 165 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Sep 2025 |
| 166 | Red Hills Resources, Inc. | Englewood, KS 67840 | Oil & Gas Operator | Sep 2025 |
| 167 | Reef Exploration Corporation | Richardson, TX 75080 | Oil Operator | Sep 2019 |
| 168 | Reh Oil And Gas, LLC. | Pratt, KS 67124 | Oil & Gas Operator | Apr 2019 |
| 169 | Rine Drilling Co | | Oil & Gas Operator | Mar 1994 |
| 170 | Rine Drillingand Exploration, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2009 |
| 171 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 172 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Dec 2025 |
| 173 | Robinson Energy & Exploration, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Aug 2008 |
| 174 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 175 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 176 | Saaw Operating LLC | Protection, KS 67127 | Oil & Gas Operator | Sep 2025 |
| 177 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 178 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 179 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Feb 2026 |
| 180 | Schulein Company LLC | Denver, CO 80246 | Oil & Gas Operator | Aug 2025 |
| 181 | Schulein Robert | | Oil & Gas Operator | Dec 1995 |
| 182 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 183 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Sep 2025 |
| 184 | Sho-Bar Energy I | | Oil & Gas Operator | Jan 1991 |
| 185 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Oct 2025 |
| 186 | SMG Resources LLC | | Oil & Gas Operator | Sep 2025 |
| 187 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 188 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 189 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 190 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Sep 2025 |
| 191 | Sunwest Explorat | | Oil & Gas Operator | Nov 1985 |
| 192 | Swift Energy Com | | Oil & Gas Operator | Sep 1995 |
| 193 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 194 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 195 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 196 | Thoroughbred Associates LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 197 | Todd C H Incorpo | | Oil & Gas Operator | Feb 1994 |
| 198 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Nov 2025 |
| 199 | Trigg Exploratio | | Gas Operator | Feb 1992 |
| 200 | Tucker Prod Corp | | Oil & Gas Operator | Dec 1985 |