| 201 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 202 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Apr 2025 |
| 203 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 204 | Milburn R Kenneth | Ardmore, OK 73402-1118 | Oil & Gas Operator | Sep 2014 |
| 205 | Mitchell James D | Bartlesville, OK 74006-7610 | Oil Operator | Nov 2025 |
| 206 | Moms Oil & Gas LLC | Nowata, OK 74048 | Oil & Gas Operator | Mar 2023 |
| 207 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 208 | N L S Inc | Kimberling City, MO 65686 | Oil & Gas Operator | Aug 2016 |
| 209 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Feb 2026 |
| 210 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Nov 2025 |
| 211 | New Lift Inc | Nowata, OK 74048-0245 | Oil & Gas Operator | Mar 2015 |
| 212 | Nject Disposal LLC | Houston, TX 77027 | Oil Operator | Mar 2017 |
| 213 | Nowata Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1997 |
| 214 | Nowata Petroleum Operating Co | Nowata, OK 74048-9617 | Oil Operator | Aug 2014 |
| 215 | Oil Lift Inc | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 216 | Oklahoma Natural Resources Inc | Woodward, OK 73801 | Oil & Gas Operator | Sep 1996 |
| 217 | Onyx Properties Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2006 |
| 218 | Oswego Arbuckle Enterprise Inc | S Coffeyville, OK 74072-9702 | Oil & Gas Operator | Mar 2015 |
| 219 | Overflow Energy Stack LLC | Booker, TX 79005 | Oil Operator | Sep 2022 |
| 220 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Dec 2025 |
| 221 | Ozark Oil Corporation | Springfield, MO 65804 | Oil & Gas Operator | Oct 1992 |
| 222 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | Dec 2025 |
| 223 | Painter & McPhail | Bartlesville, OK 74006 | Oil Operator | Sep 1996 |
| 224 | Pan Petroleum MLP | Kansas City, MO 64114 | Oil & Gas Operator | Aug 1997 |
| 225 | Pan Texas Petroleum Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2003 |
| 226 | Panoak Oil & Gas Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Aug 2018 |
| 227 | Parker Joe | Talala, OK 74080-3556 | Oil & Gas Operator | Dec 2012 |
| 228 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |
| 229 | Patrick Exploration Company | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 230 | Patriot Petroleum Company | Bethany, OK 73008 | Oil & Gas Operator | Mar 2015 |
| 231 | Pemco LLC | Skiatook, OK 74070 | Oil Operator | Nov 2025 |
| 232 | Performance Petroleum Company LLC | Barnsdall, OK 74002 | Oil & Gas Operator | Nov 2025 |
| 233 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 234 | Petrolanic Inc | Tulsa, OK 74105 | Oil Operator | Oct 1991 |
| 235 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Feb 2026 |
| 236 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 237 | Petrolia Drilling Corporation | | Oil & Gas Operator | Jul 2003 |
| 238 | Phoenix LTD | Charlotte, NC 28231-1547 | Oil Operator | Sep 2001 |
| 239 | Pierce Oil Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2017 |
| 240 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 241 | Portfolio Oil Corporation | Oklahoma City, OK 73119 | Oil & Gas Operator | May 2013 |
| 242 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2025 |
| 243 | Price Operating Company Inc | Nowata, OK 74048 | Oil & Gas Operator | Mar 2020 |
| 244 | Pricor-TRC Corporation | Mounds, OK 74047 | Oil & Gas Operator | May 2013 |
| 245 | Proven Reserves Production Co | Richardson, TX 75080 | Oil & Gas Operator | Nov 1998 |
| 246 | Putnam Phyllis L | Bartlesville, OK 74006-7326 | Oil & Gas Operator | May 2021 |
| 247 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 248 | R C Oil Company Inc | Nowata, OK 74048-3402 | Oil Operator | Nov 2021 |
| 249 | Ranger Petroleum Inc | | Oil & Gas Operator | Mar 2014 |
| 250 | Reber Matthew A Mrs | Grove, OK 74344-3605 | Oil & Gas Operator | Jul 2004 |
| 251 | Redbird Oil Company | Bartlesville, OK 74005-2566 | Oil & Gas Operator | Mar 2015 |
| 252 | Redbud Oil & Gas | Nowata, OK 74048-0026 | Oil & Gas Operator | Dec 2000 |
| 253 | Redhen Oil Company | Oklahoma City, OK 73135 | Oil & Gas Operator | Sep 2024 |
| 254 | Rice Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2020 |
| 255 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 256 | Riley Deborah R | Nowata, OK 74048 | Oil Operator | Oct 2025 |
| 257 | Rio VIsta Operating LLC | Eufaula, OK 74432-0789 | Gas Operator | Nov 2025 |
| 258 | River Rock Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 259 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 260 | Robertson Jay Estate | Tulsa, OK 74127-3029 | Oil & Gas Operator | Jul 2013 |
| 261 | Robertson Johnie J | Okmulgee, OK 74447-8765 | Oil & Gas Operator | Nov 2025 |
| 262 | Rockford CBM LLC | Tulsa, OK 74103-4335 | Oil & Gas Operator | Jan 2013 |
| 263 | Rocky Roads Operating LLC | Tulsa, OK 74103-4048 | Oil & Gas Operator | Dec 2025 |
| 264 | Rocky Top Energy LLC | Bartlesville, OK 74003 | Oil & Gas Operator | Sep 2025 |
| 265 | S & C Resources Inc | Cleveland, OK 74020 | Oil Operator | May 2025 |
| 266 | S & H Tank Service Of Okla | Lindsay, OK 73052 | Oil & Gas Operator | Mar 2017 |
| 267 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Feb 2026 |
| 268 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 269 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 270 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 271 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 272 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 273 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Dec 2025 |
| 274 | Shelton Oil Company LLC | Collinsville, OK 74021-5619 | Oil Operator | Nov 2025 |
| 275 | Short Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Nov 2025 |
| 276 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 277 | Smith Connie M & Sheryle | Chelsea, OK 74016-1959 | Oil Operator | Feb 2017 |
| 278 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 279 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Nov 2025 |
| 280 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 281 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Nov 2025 |
| 282 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Nov 2025 |
| 283 | Spurgeon William Allan | Nowata, OK 74048-9713 | Oil Operator | Feb 2010 |
| 284 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 285 | Sterling Properties Inc | Lawton, OK 73501-9601 | Oil Operator | Oct 2025 |
| 286 | Stites Energy LLC | Brighton, CO 80601-6532 | Oil & Gas Operator | Oct 2019 |
| 287 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 288 | Stumpff Paul | Bartlesville, OK 74006-3426 | Oil & Gas Operator | Mar 2015 |
| 289 | Subterranean Energy, LLC | Tyler, TX 75705 | Oil & Gas Operator | Feb 2026 |
| 290 | Superior Companies Inc | Bartlesville, OK 74003-2621 | Oil & Gas Operator | May 2013 |
| 291 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | Nov 2025 |
| 292 | T Bar M Energy Resources LLC | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2025 |
| 293 | Taylor Oil Company | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 294 | Tec Resources LLC | Tulsa, OK 74128 | Oil & Gas Operator | May 2013 |
| 295 | Topco Inc | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2005 |
| 296 | Trackstar Energies LLC | Colorado Springs, CO 80919-3233 | Oil Operator | Mar 2023 |
| 297 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 298 | Two Pines | Drumright, OK 74030-5502 | Oil & Gas Operator | Feb 2012 |
| 299 | Vector Exploration Inc | Oklahoma City, OK 73142-4430 | Oil & Gas Operator | Dec 2018 |
| 300 | Vincent Production Company | | Oil & Gas Operator | Dec 2006 |