| 201 | Legacy Reserves Operating LP | Denver, CO 80202 | Oil & Gas Operator | May 2024 |
| 202 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 203 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Feb 2024 |
| 204 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 205 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 206 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 207 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 208 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 209 | LP Robinson Holdings, L.L.C. | Abilene, TX 79608 | Oil Operator | May 2024 |
| 210 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | May 2024 |
| 211 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 212 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2024 |
| 213 | M & M General Contractors, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | May 2024 |
| 214 | M2 Squared Operating, LLC | Ranger, TX 76470 | Oil Operator | May 2024 |
| 215 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 216 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 217 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 218 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 219 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | May 2024 |
| 220 | Martex Oil & Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | May 2024 |
| 221 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2024 |
| 222 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | May 2024 |
| 223 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 224 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 225 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 226 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 227 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 228 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | May 2024 |
| 229 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 230 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 231 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 232 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 233 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 234 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 235 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 236 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 237 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 238 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 239 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2023 |
| 240 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 241 | Mitchell Resources, Inc. | Addison, TX 75001 | Oil & Gas Operator | Aug 2003 |
| 242 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 243 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2024 |
| 244 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 245 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | May 2024 |
| 246 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 247 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2024 |
| 248 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 249 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2024 |
| 250 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 251 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jan 2024 |
| 252 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 253 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 254 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 255 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | May 2024 |
| 256 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 257 | Neff, Mickey Oil Company | Colorado City, TX 79512 | Oil & Gas Operator | Jul 2023 |
| 258 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | May 2024 |
| 259 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 260 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2024 |
| 261 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 262 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | May 2024 |
| 263 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 264 | NRPC Operating, LLC | Dallas, TX 75206 | Oil Operator | Feb 2012 |
| 265 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 266 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | May 2024 |
| 267 | Oilex Int'L Investments, Inc. | Luling, TX 78648 | Oil & Gas Operator | May 2024 |
| 268 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 269 | Omni Operating Company(A) | Dallas, TX 75370 | Oil & Gas Operator | May 2024 |
| 270 | Onaroll Operating LLC | Levelland, TX 79336 | Oil Operator | May 2024 |
| 271 | One Nickel Operating LLC | Westbrook, TX 79565 | Oil Operator | May 2024 |
| 272 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 273 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 274 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 275 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 276 | Parapetroleum | Kerrville, TX 78028 | Oil & Gas Operator | Feb 1997 |
| 277 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 278 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 279 | Partee Drilling Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2024 |
| 280 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 281 | Patriot Services, Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Mar 2008 |
| 282 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 283 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 284 | Penergy | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 285 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | May 2024 |
| 286 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | May 2024 |
| 287 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 288 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 289 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | May 2024 |
| 290 | Phoenix Crude Oil Company | Westbrook, TX 79565 | Oil Operator | Oct 2004 |
| 291 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2024 |
| 292 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 293 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 294 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 295 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 296 | Presco | Snyder, TX 79549 | Oil & Gas Operator | Jan 2024 |
| 297 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 298 | Production Marketing Assoc Inc | Plano, TX 75075 | Oil & Gas Operator | May 2024 |
| 299 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 300 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |