| 201 | Kenworthy Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 202 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 203 | Kidd Oil & Gas, LC | Dallas, TX 75219 | Oil & Gas Operator | Apr 1999 |
| 204 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 205 | Kinder Morgan Production Co LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2007 |
| 206 | King Oil & Resources Co | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 207 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2025 |
| 208 | Kohler Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 209 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 210 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 211 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Jul 2025 |
| 212 | Landrick O & G Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 213 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 214 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 215 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 216 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 217 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 218 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 219 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 220 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 221 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 222 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 223 | LP Robinson Holdings, L.L.C. | Abilene, TX 79608 | Oil Operator | Jul 2025 |
| 224 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 225 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 226 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 227 | M & M General Contractors, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Jul 2025 |
| 228 | M2 Squared Operating, LLC | Rockwall, TX 75032 | Oil Operator | Jul 2025 |
| 229 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 230 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 231 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 232 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 233 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Jul 2025 |
| 234 | Martex Oil & Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Jul 2025 |
| 235 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 236 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 237 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 238 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 239 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 240 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 241 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 242 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 243 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Jul 2025 |
| 244 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 245 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 246 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 247 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 248 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 249 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 250 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 251 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 252 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 253 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 254 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 255 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 256 | Mitchell Resources, Inc. | Addison, TX 75001 | Oil & Gas Operator | Aug 2003 |
| 257 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 258 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 259 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 260 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | Jul 2025 |
| 261 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 262 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Jul 2025 |
| 263 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 264 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 265 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 266 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 267 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Mar 2025 |
| 268 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 269 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 270 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 271 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 272 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 273 | Neff, Mickey Oil Company | Colorado City, TX 79512 | Oil & Gas Operator | Jul 2023 |
| 274 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 275 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 276 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 277 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 278 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Jul 2025 |
| 279 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 280 | NRPC Operating, LLC | Dallas, TX 75206 | Oil Operator | Feb 2012 |
| 281 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 282 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Jul 2025 |
| 283 | Oilex Int'L Investments, Inc. | Luling, TX 78648 | Oil & Gas Operator | Jul 2025 |
| 284 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 285 | Omni Operating Company(A) | Dallas, TX 75370 | Oil & Gas Operator | Jul 2025 |
| 286 | Onaroll Operating LLC | Levelland, TX 79336 | Oil Operator | Jul 2025 |
| 287 | One Nickel Operating LLC | Westbrook, TX 79565 | Oil Operator | Jul 2025 |
| 288 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 289 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 290 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 291 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 292 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 293 | Pace Production Co. | San Angelo, TX 76902 | Oil & Gas Operator | Jul 2025 |
| 294 | Parapetroleum | Kerrville, TX 78028 | Oil & Gas Operator | Feb 1997 |
| 295 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 296 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 297 | Partee Drilling Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 298 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 299 | Patriot Services, Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Mar 2008 |
| 300 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |