| 201 | K M X Corporation Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2001 |
| 202 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 203 | Karis Resources, LLC | Tyler, TX 75707 | Oil & Gas Operator | Feb 2019 |
| 204 | Kat Energy Corporation | Amarillo, TX 79105 | Gas Operator | Sep 2001 |
| 205 | Kat Energy, LTD. | Amarillo, TX 79120 | Gas Operator | Jun 2020 |
| 206 | Kellerville Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 207 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Dec 2025 |
| 208 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 209 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 210 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 211 | King Oil & Resources Co | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 212 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 213 | Kismet Properties, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2025 |
| 214 | Klause & Klaus Oil Co. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2003 |
| 215 | Kodiak Drilling, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2003 |
| 216 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 217 | Kodiak Operating, L.L.C. | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 218 | L & G Operating, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2021 |
| 219 | L & J Oil Co. | Borger, TX 79007 | Oil & Gas Operator | Apr 1999 |
| 220 | L And C Leasing, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2019 |
| 221 | L And L Production Company | Skellytown, TX 79080 | Oil & Gas Operator | Sep 1996 |
| 222 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 223 | Large Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Dec 2025 |
| 224 | Lasater & Co, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Dec 2025 |
| 225 | Latigo Petroleum LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 226 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 227 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Aug 2025 |
| 228 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Dec 2025 |
| 229 | Leejan Oil Company | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 230 | Lefforge & Klein | Amarillo, TX 79114 | Gas Operator | Jun 1997 |
| 231 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 232 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 233 | Lera | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 234 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 235 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 236 | Liquid Petroleum Resources, Inc. | Amarillo, TX 79120 | Gas Operator | Dec 2025 |
| 237 | Little Oil & Gas | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 238 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Dec 2025 |
| 239 | Losure Pet. Co. | Borger, TX 79008 | Oil & Gas Operator | Apr 2014 |
| 240 | Losure, Ken | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 241 | Lucky Bird Too | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 242 | Lundy, Richard C. | Pampa, TX 79066 | Oil & Gas Operator | Aug 1997 |
| 243 | Luxor Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 244 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 245 | M E G G , Inc. | Borger, TX 79008 | Oil & Gas Operator | Sep 2003 |
| 246 | M5oexit, LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 247 | Mac 5 Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2021 |
| 248 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 249 | Makoil, Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jul 2007 |
| 250 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 251 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 252 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 253 | McClelland Creek Properties,Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 254 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Aug 2025 |
| 255 | McDonald, R. A. Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Oct 2002 |
| 256 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 257 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 258 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 259 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 260 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 261 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 262 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Aug 2025 |
| 263 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 264 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 265 | Mistex Operating, Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Dec 2025 |
| 266 | Mitchell Ehrlich Oil & Gas, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 267 | MMGL TXPH, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 268 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 269 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 270 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 271 | Morred, Inc. | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 272 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 273 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 274 | Natural Gas Pipeline Co Of Amer. | Houston, TX 77002 | Gas Operator | Jul 2008 |
| 275 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 276 | New-Tex Operating II, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 277 | New-Tex Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 278 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 279 | Nisrol, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 280 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 281 | Nodding Donkey Production | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 282 | North Country Energy LLC | Amarillo, TX 79159 | Oil & Gas Operator | Dec 2025 |
| 283 | North Star Petroleum Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1993 |
| 284 | North Texas Llano Operating Corp | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 285 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 286 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Dec 2025 |
| 287 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 288 | Oates, John Co., Inc. | Stinnett, TX 79083 | Oil & Gas Operator | Dec 2025 |
| 289 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 290 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 291 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 292 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 293 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 294 | Onyx Producing Company, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2008 |
| 295 | Orion Oil & Gas Properties | Amarillo, TX 79109 | Gas Operator | Oct 2000 |
| 296 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 297 | Otc Petroleum Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 298 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 299 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 300 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |