| 201 | L & W Operators | Pampa, TX 79066 | Oil & Gas Operator | Jan 2018 |
| 202 | L And C Leasing, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2019 |
| 203 | Laclede Operating Co. | Pampa, TX 79065 | Gas Operator | Aug 1999 |
| 204 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 205 | Large Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Jul 2025 |
| 206 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 207 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 208 | Lera | Borger, TX 79007 | Oil & Gas Operator | Jul 2025 |
| 209 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 210 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 211 | Lionheart Energy Corporation | Durango, CO 81301 | Oil & Gas Operator | Jul 2025 |
| 212 | Little Oil & Gas | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 213 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 214 | LLR Operating | Pampa, TX 79065 | Oil Operator | Jul 2025 |
| 215 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 216 | Losure, Ken | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 217 | Luxor Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 218 | Lyric Energy, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 1996 |
| 219 | M E G G , Inc. | Borger, TX 79008 | Oil & Gas Operator | Sep 2003 |
| 220 | M.D. Skroopka Operating, LLC | Oakland, CA 94611 | Oil & Gas Operator | Jul 2025 |
| 221 | M5oexit, LLC | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 222 | Mac 5 Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2021 |
| 223 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 224 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 225 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 226 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 227 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 228 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 229 | McClelland Creek Properties,Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 230 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 231 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 232 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 233 | McKay Operating LLC | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2023 |
| 234 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 235 | Megg, L.P. | Borger, TX 79007 | Oil & Gas Operator | Jul 2025 |
| 236 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 237 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 238 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 239 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 240 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 241 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 242 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 243 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 244 | Minco Oil And Gas Co. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2024 |
| 245 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 246 | MK Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Jun 2014 |
| 247 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 248 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 249 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 250 | Mon Corp. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 251 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 252 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 253 | Morgas | Shamrock, TX 79079 | Gas Operator | Nov 1994 |
| 254 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 255 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 256 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 257 | Natural Gas Pipeline Co Of Amer. | Houston, TX 77002 | Gas Operator | Jul 2008 |
| 258 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Jul 2025 |
| 259 | Newfield Expl. Mid-Con. Inc | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2015 |
| 260 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 261 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 262 | Nora Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 263 | North Country Energy LLC | Amarillo, TX 79159 | Oil & Gas Operator | Jul 2025 |
| 264 | O'Brien Energy Resources Corp | Portsmouth, NH 03801 | Oil & Gas Operator | Jul 2025 |
| 265 | O'Neal Cattle Co. | Pampa, TX 79066 | Gas Operator | Jul 2025 |
| 266 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Jul 2025 |
| 267 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 268 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Jul 2025 |
| 269 | Occam Petroleum E&P, LLC | Meeker, OK 74855 | Oil Operator | Jul 2025 |
| 270 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 271 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 272 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 273 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 274 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 275 | Onyx Producing Company, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2008 |
| 276 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 277 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 278 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 279 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 280 | Pampa Water Disposal, Inc. | Booker, TX 79005 | Oil & Gas Operator | Jul 2025 |
| 281 | Panhandle Producing Company | San Antonio, TX 78205 | Oil & Gas Operator | Oct 1993 |
| 282 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2025 |
| 283 | Pantex Oil & Gas LLC | Ranger, TX 76470 | Oil & Gas Operator | Jul 2018 |
| 284 | Parallel Energy LP | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2015 |
| 285 | Paramount Producing, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1996 |
| 286 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 287 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 288 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | May 2025 |
| 289 | Petco Energy Corporation | Hinsdale, IL 60521 | Oil & Gas Operator | Jul 2025 |
| 290 | Petco Petroleum Corp | Hinsdale, IL 60521 | Oil & Gas Operator | Apr 2025 |
| 291 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Jul 2025 |
| 292 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 293 | Petroleum International, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2000 |
| 294 | Petrolia Group, L.L.C. | Katy, TX 77449 | Oil & Gas Operator | Jul 2025 |
| 295 | PG-M International Operating,LLC | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 296 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 297 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 298 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 299 | PNG Gathering, LLC | Wellington, TX 79095 | Oil & Gas Operator | Dec 2024 |
| 300 | PNG Production, LLC | Wellington, TX 79095 | Oil & Gas Operator | Jul 2025 |