| 201 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 202 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 203 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | Dec 2025 |
| 204 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2025 |
| 205 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 206 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 207 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 208 | MMGL East Texas II, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 209 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 210 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 211 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Dec 2025 |
| 212 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 213 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 214 | Murphy, K. P. Oil Operator | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 215 | Ncec, Inc. | Winnsboro, TX 75494 | Oil & Gas Operator | May 1994 |
| 216 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 217 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 218 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | Dec 2025 |
| 219 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | Dec 2025 |
| 220 | Noble & Cantrell Expl. Co., Inc. | Winnsboro, TX 75494 | Oil & Gas Operator | Aug 2006 |
| 221 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 222 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 223 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 224 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 225 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Dec 2025 |
| 226 | One Tec Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2007 |
| 227 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 228 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 229 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 230 | Pangea'S Edge Operating Company LLC | Plano, TX 75025 | Oil & Gas Operator | Dec 2025 |
| 231 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 232 | Park & Park Oil Co. | Allen, TX 75002 | Oil & Gas Operator | Dec 2025 |
| 233 | Peak Operating LLC | Oklahoma City, OK 73157 | Oil & Gas Operator | Jun 2025 |
| 234 | Pentad Development Corp. (A) | Dallas, TX 75201 | Oil & Gas Operator | Mar 1993 |
| 235 | Pergerson Energy, L.L.C. | Richmond, VA 23225 | Oil Operator | Dec 2025 |
| 236 | Person, J.S., Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 237 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 238 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 239 | Phillips, B. F. Jr., Estate Of | Dallas, TX 75201 | Oil & Gas Operator | Mar 2011 |
| 240 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 2025 |
| 241 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 242 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | Dec 2025 |
| 243 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 244 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 245 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 246 | Powell, Gene Investments, Inc. | Longview, TX 75608 | Oil & Gas Operator | Apr 2024 |
| 247 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Dec 2025 |
| 248 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 249 | Quitman Construction Co., Inc. | Quitman, TX 75783 | Oil & Gas Operator | May 2011 |
| 250 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Dec 2025 |
| 251 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 252 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 253 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 254 | Redwood Oil & Gas | McKinney, TX 75070 | Oil & Gas Operator | Apr 2013 |
| 255 | Reeder, Wendell A. | Kilgore, TX 75663 | Oil Operator | Jul 2013 |
| 256 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 257 | Rheata Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 258 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 259 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 260 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 261 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 262 | Ridley Oil Corporation | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 263 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 264 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 265 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 266 | Road Oil Sales Inc. | Tyler, TX 75711 | Oil Operator | Dec 1984 |
| 267 | Robbins Petroleum Corp. | Longview, TX 75606 | Oil & Gas Operator | Sep 1994 |
| 268 | Robinett Resources Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 1999 |
| 269 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 270 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 271 | Rover Operating Inc | Richardson, TX 75080 | Oil & Gas Operator | Apr 2000 |
| 272 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 273 | Rowan-Ungerecht, Inc. | Van, TX 75790 | Oil & Gas Operator | Sep 1993 |
| 274 | RTZ Energy, LLC | Kilgore, TX 75663 | Gas Operator | Apr 2006 |
| 275 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Dec 2025 |
| 276 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 277 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 278 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 279 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 280 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 281 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 282 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Dec 2025 |
| 283 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 284 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 285 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 286 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 287 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 288 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 289 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 290 | Secondary Oil Corp., Inc. | Austin, TX 78750 | Oil Operator | Apr 1999 |
| 291 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Dec 2025 |
| 292 | Setex Oil Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jan 2000 |
| 293 | SGP Operating LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 294 | Shelby Production Co. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2009 |
| 295 | Shelby, Michael H. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 296 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 297 | Sigmon Production Company, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2013 |
| 298 | Signal Oil Company, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 299 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 300 | Simples Oil International, LLC | Los Angeles, CA 90067 | Oil & Gas Operator | Dec 2025 |