| 201 | Lyons & Lyons Inc | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2025 |
| 202 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 203 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 204 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 205 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 206 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 207 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 208 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 209 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 210 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 211 | Mikco Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2001 |
| 212 | MJM Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 213 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Mar 2025 |
| 214 | Morris Dennis J | Cameron, OK 74932-2186 | Gas Operator | Feb 2025 |
| 215 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 216 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 217 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 218 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 219 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 220 | Nadel And Gussman, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | May 2025 |
| 221 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 222 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 223 | Natural Gas Compression Corp | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2025 |
| 224 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2024 |
| 225 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Feb 2025 |
| 226 | Njre Operating Company | Tulsa, OK 74119 | Gas Operator | Dec 2016 |
| 227 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 228 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2025 |
| 229 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 230 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | May 2025 |
| 231 | Oklahoma Rig & Salvage, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 232 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 233 | Orloski John C | Bartlesville, OK 74006 | Oil & Gas Operator | Feb 2025 |
| 234 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 235 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Mar 2025 |
| 236 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Feb 2025 |
| 237 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 238 | Oxley Petroleum Co | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 239 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 240 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 241 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 242 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 243 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 244 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Jan 2025 |
| 245 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 246 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 247 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Mar 2025 |
| 248 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 249 | Priam Operating Company | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2022 |
| 250 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 251 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 252 | Providence Exploration & Production Inc | Fort Smith, AR 72913-5171 | Gas Operator | Dec 2012 |
| 253 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 254 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2025 |
| 255 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 256 | Quality Production Co Of Stigler Inc | Stigler, OK 74462-0635 | Gas Operator | Feb 2013 |
| 257 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 258 | Quinton Rental & Repair Serv Inc | Quinton, OK 74561-0432 | Oil & Gas Operator | Mar 2015 |
| 259 | R A Miller Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2020 |
| 260 | R E C Tulsa Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2014 |
| 261 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 262 | Red Rocks Oil & Gas Operating LLC | Oklahoma City, OK 73103-4821 | Oil & Gas Operator | Mar 2025 |
| 263 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 264 | Redhen Oil Company | Oklahoma City, OK 73135 | Oil & Gas Operator | Sep 2024 |
| 265 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 266 | Redwine Resources Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2015 |
| 267 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 268 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 269 | Riverfront Exploration LLC | Fort Smith, AR 72901 | Gas Operator | Feb 2025 |
| 270 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 271 | Rockin S Field Service LLC | Stigler, OK 74462 | Gas Operator | Feb 2025 |
| 272 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jan 2025 |
| 273 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 274 | Sagely, Floyd E Properties, LTD | Fort Smith, AR 72917-0308 | Gas Operator | Jan 2015 |
| 275 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 276 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 277 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 278 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | May 2025 |
| 279 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | May 2025 |
| 280 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 281 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 282 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 283 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 284 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | May 2025 |
| 285 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 286 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 287 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 288 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Feb 2025 |
| 289 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 290 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 291 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 292 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Feb 2025 |
| 293 | Shields Operating, Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 294 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2025 |
| 295 | Silverridge Corp | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2015 |
| 296 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 297 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 298 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 299 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Mar 2025 |
| 300 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |