| 201 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 202 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 203 | Lavaca River Operating Co., LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 204 | Leeper Oil Exp. & Prod. Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 205 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 206 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 207 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 208 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 209 | Lone Star Operations LLC | Lubbock, TX 79401 | Oil & Gas Operator | Mar 2025 |
| 210 | Lunar Oil Company | Midland, TX 79708 | Oil & Gas Operator | Feb 1999 |
| 211 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 212 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 213 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 214 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 215 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Mar 2025 |
| 216 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 217 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 218 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 219 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 220 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 221 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 222 | Masada Development Company | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2021 |
| 223 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 224 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 225 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 226 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 227 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 228 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 229 | McCrary & Franklin, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2012 |
| 230 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 231 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 232 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Mar 2025 |
| 233 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Mar 2025 |
| 234 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 235 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 236 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 237 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 238 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 239 | Miranda Energy Corporation | Midland, TX 79705 | Oil & Gas Operator | Jun 2016 |
| 240 | Mist Prod. & Exploration Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 241 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 242 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Mar 2025 |
| 243 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Mar 2025 |
| 244 | Molly Oil & Gas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Mar 2025 |
| 245 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 246 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 247 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 248 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 249 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 250 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 251 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 252 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 253 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 254 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 255 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 256 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 257 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Dec 2024 |
| 258 | Onaroll Operating LLC | Levelland, TX 79336 | Oil Operator | Mar 2025 |
| 259 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 260 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 261 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Mar 2025 |
| 262 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 263 | Paladin Exploration Co., Inc. | Plano, TX 75093 | Oil & Gas Operator | Feb 1995 |
| 264 | Palmer Oil Properties | Post, TX 79356 | Oil & Gas Operator | Mar 2025 |
| 265 | Par Producing Company | Snyder, TX 79550 | Oil & Gas Operator | Jun 2017 |
| 266 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 267 | Parish, John R. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 268 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 269 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 270 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 271 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 272 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 273 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 274 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 275 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 276 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 277 | Pedernales Production, LP | Houston, TX 77057 | Oil & Gas Operator | Mar 2022 |
| 278 | Pegasus Operating, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | Mar 2025 |
| 279 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2024 |
| 280 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 281 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 282 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 283 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 284 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 285 | Pierce Junction Petroleum Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 286 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Mar 2025 |
| 287 | Plains Marketing, LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 288 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 289 | PMB Energy, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2025 |
| 290 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 291 | Powell Properties, Inc. | Los Altos, CA 94024 | Oil & Gas Operator | Mar 2025 |
| 292 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 293 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 294 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 295 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 296 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 297 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Mar 2025 |
| 298 | Quatro Oil And Gas, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 299 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 300 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Mar 2025 |