| 101 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 102 | Lasso Energy LLC | Chase, KS 67524 | Oil & Gas Operator | Sep 2025 |
| 103 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 104 | Lear Petroleum E | | Oil & Gas Operator | Jan 1986 |
| 105 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 106 | Lotus Operating Company, L.L.C. | Wichita, KS 67204 | Oil & Gas Operator | Sep 2025 |
| 107 | Louis Dreyfus Natural Gas Corp. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2015 |
| 108 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 109 | Lyons & Lyons Inc | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 110 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 111 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Nov 2025 |
| 112 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 113 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Nov 2025 |
| 114 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 115 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 116 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 117 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 118 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Dec 2025 |
| 119 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 120 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Sep 2025 |
| 121 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Sep 2025 |
| 122 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 123 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Nov 2025 |
| 124 | Morrison-Dixon O | | Oil Operator | Oct 1993 |
| 125 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 126 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Nov 2025 |
| 127 | Murray Oil And Gas LLC | Greensburg, KS 67054 | Oil & Gas Operator | Sep 2025 |
| 128 | National Oil Com | | Oil & Gas Operator | Oct 1992 |
| 129 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 130 | Nec Operating - Kansas, LLC | Southlake, TX 76092 | Oil & Gas Operator | Sep 2025 |
| 131 | Norstar Petroleu | | Oil & Gas Operator | Dec 1996 |
| 132 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Sep 2025 |
| 133 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 134 | Oakwood Resources Inc | Dallas, TX 75374 | Oil & Gas Operator | May 1998 |
| 135 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 136 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 137 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 138 | Palmer Engineering, Inc. | Luray, KS 67649 | Gas Operator | Mar 2000 |
| 139 | Patrick R J Oper | | Oil & Gas Operator | Jan 1995 |
| 140 | Patton Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 141 | Pelican Hill Oil & Gas, Inc. | Carlsbad, CA 92010 | Oil & Gas Operator | May 2013 |
| 142 | Petro Dynamics C | | Oil & Gas Operator | Sep 1988 |
| 143 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 144 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 145 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 146 | Petx Petroleum C | | Oil Operator | Nov 1993 |
| 147 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Sep 2025 |
| 148 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 149 | Pioneer Oil Company, Inc. | Vincennes, IN 47501 | Oil & Gas Operator | Sep 2025 |
| 150 | Pollok Energy LLC | Tulsa, OK 74159 | Oil & Gas Operator | Nov 2025 |
| 151 | Post Rock Gas, Inc. | Luray, KS 67699 | Oil & Gas Operator | Jun 2003 |
| 152 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 153 | Prisum Ventures | | Oil & Gas Operator | Oct 1995 |
| 154 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Nov 2025 |
| 155 | Questar Exploration And Production Company Division Of Questar Urc Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2023 |
| 156 | Quintana Minerals Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2003 |
| 157 | R J Patrick Operating, LLC | Liberal, KS 67905 | Gas Operator | Aug 2006 |
| 158 | R.J. Patrick Operating Co. | | Oil & Gas Operator | Jun 2006 |
| 159 | Raker Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 160 | Ramco Drilling S | | Oil & Gas Operator | Dec 1992 |
| 161 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 162 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Sep 2025 |
| 163 | RDH Enterprises Inc | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 164 | Red Cedar Oil, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jul 2025 |
| 165 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Nov 2025 |
| 166 | Roberts & Murphy | | Oil & Gas Operator | Sep 1995 |
| 167 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 168 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 169 | S & C Construction, Inc. | Whitefish, MT 59937 | Oil & Gas Operator | Dec 2025 |
| 170 | Saaw Operating LLC | Protection, KS 67127 | Oil & Gas Operator | Sep 2025 |
| 171 | Sagebrush Operating LLC | Denver, CO 80203 | Oil & Gas Operator | Aug 2025 |
| 172 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 173 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 174 | Samuel Gary Jr. & Assoc., Inc. | | Oil & Gas Operator | Mar 2023 |
| 175 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 176 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Oct 2025 |
| 177 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2025 |
| 178 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Oct 2025 |
| 179 | Sidwell Oil & Ga | | Oil & Gas Operator | May 1993 |
| 180 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 181 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 182 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 183 | Smith Oil Operations | | Oil & Gas Operator | Sep 2025 |
| 184 | Smith Richard F | | Oil Operator | Jun 1995 |
| 185 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Sep 2025 |
| 186 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 187 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 188 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 189 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Oct 2025 |
| 190 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 191 | Thoroughbred Associates LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 192 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 2025 |
| 193 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 194 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 195 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 196 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 197 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 198 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 199 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 200 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |