| 201 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 202 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 203 | Lear Petroleum Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2015 |
| 204 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 205 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 206 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Dec 2024 |
| 207 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 208 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 209 | Longberry Energy Inc | Keota, OK 74941 | Gas Operator | Jan 2025 |
| 210 | Longview Production Company | Dallas, TX 75243-3795 | Oil & Gas Operator | Dec 2024 |
| 211 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Dec 2024 |
| 212 | Louis Dreyfus Gas Marketing | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2018 |
| 213 | LR Energy, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Nov 2024 |
| 214 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 215 | LXS Inc | Stigler, OK 74462-0506 | Gas Operator | Nov 2013 |
| 216 | Lyons & Lyons Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2024 |
| 217 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 218 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 219 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 220 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jan 2025 |
| 221 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 222 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 223 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 224 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 225 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 226 | Mikco Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2001 |
| 227 | MJM Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Jan 2025 |
| 228 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Jan 2025 |
| 229 | Morris Dennis J | Cameron, OK 74932-2186 | Gas Operator | Dec 2024 |
| 230 | Mountain Front Pipeline Co Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 231 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 232 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 233 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 234 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 235 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 236 | Nadel And Gussman, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 237 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 238 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 239 | Natural Gas Compression Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2024 |
| 240 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2024 |
| 241 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Dec 2024 |
| 242 | Njre Operating Company | Tulsa, OK 74119 | Gas Operator | Dec 2016 |
| 243 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 244 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Mar 2025 |
| 245 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 246 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2025 |
| 247 | Oklahoma Rig & Salvage, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 248 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 249 | Orloski John C | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2024 |
| 250 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 251 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2025 |
| 252 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Jan 2025 |
| 253 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 254 | Oxley Petroleum Co | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 255 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 256 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 257 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 258 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 259 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 260 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Dec 2024 |
| 261 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 262 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 263 | Pettigrew Kenny | Spiro, OK 74959 | Gas Operator | Dec 2024 |
| 264 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Jan 2025 |
| 265 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 266 | Priam Operating Company | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2022 |
| 267 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 268 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 269 | Production Gathering Co | Dallas, TX 75243 | Oil & Gas Operator | Apr 2009 |
| 270 | Providence Exploration & Production Inc | Fort Smith, AR 72913-5171 | Gas Operator | Dec 2012 |
| 271 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 272 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 273 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 274 | Quality Production Co Of Stigler Inc | Stigler, OK 74462-0635 | Gas Operator | Feb 2013 |
| 275 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 276 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 277 | Quinton Rental & Repair Serv Inc | Quinton, OK 74561-0432 | Oil & Gas Operator | Mar 2015 |
| 278 | R A Miller Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2020 |
| 279 | R E C Tulsa Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2014 |
| 280 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 281 | Red Rocks Oil & Gas Operating LLC | Oklahoma City, OK 73103-4821 | Oil & Gas Operator | Jan 2025 |
| 282 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | Mar 2025 |
| 283 | Redhen Oil Company | Oklahoma City, OK 73135 | Oil & Gas Operator | Sep 2024 |
| 284 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 285 | Redwine Resources Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2015 |
| 286 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 287 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 288 | Riverfront Exploration LLC | Fort Smith, AR 72901 | Gas Operator | Dec 2024 |
| 289 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 290 | Rockin S Field Service LLC | Stigler, OK 74462 | Gas Operator | Dec 2024 |
| 291 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Nov 2024 |
| 292 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 293 | Sagely, Floyd E Properties, LTD | Fort Smith, AR 72917-0308 | Gas Operator | Jan 2015 |
| 294 | Salt Plain Pipeline Corp | Edmond, OK 73013 | Oil & Gas Operator | Jun 2010 |
| 295 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 296 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 297 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 298 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2025 |
| 299 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 300 | Sanguine Gathering Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2018 |