| 201 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 202 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 203 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 204 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Apr 2024 |
| 205 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 206 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 207 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 208 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 209 | Natural Reserves Group, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1993 |
| 210 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 211 | Nestex Energy, LLC | Newtown, PA 18940 | Oil & Gas Operator | Aug 2014 |
| 212 | New Century Operating, LLC | Spring, TX 77379 | Oil Operator | Apr 2021 |
| 213 | Nijean, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Feb 2012 |
| 214 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 215 | Noble Producing Company Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 1996 |
| 216 | Nobleson Operating, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Jun 1996 |
| 217 | Noel Operating, Inc. | Huntsville, TX 77340 | Oil & Gas Operator | Oct 2000 |
| 218 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 219 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 220 | Oasis Operating, Inc. | Lubbock, TX 79404 | Oil & Gas Operator | Nov 2020 |
| 221 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 222 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 223 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2024 |
| 224 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 225 | P&B Petroleum LLC | Miami, FL 33166 | Oil & Gas Operator | Apr 2024 |
| 226 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Apr 2024 |
| 227 | Paleo Oil Company LLC | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 2024 |
| 228 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 229 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 230 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 231 | Partners Production, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Apr 2024 |
| 232 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 233 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 234 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 235 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 236 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 237 | Pax Petroleum Corporation | La Jolla, CA 92037 | Oil & Gas Operator | Mar 2008 |
| 238 | Penntex Petroleum Corporation | Austin, TX 78731 | Oil & Gas Operator | Apr 2024 |
| 239 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 240 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 241 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 242 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 243 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Feb 2024 |
| 244 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 245 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 246 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 247 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 248 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Apr 2024 |
| 249 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 250 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 251 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 252 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 253 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 254 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 255 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 256 | Redco Oil & Gas, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2024 |
| 257 | Redwood Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 258 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2024 |
| 259 | Retamco Operating Inc | Red Lodge, MT 59068-0790 | Oil & Gas Operator | Jan 2024 |
| 260 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Feb 2024 |
| 261 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Apr 2024 |
| 262 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Apr 2024 |
| 263 | Riley Permian Operating Co, LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2024 |
| 264 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2024 |
| 265 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 266 | Rme Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2002 |
| 267 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 268 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 269 | Rockefeller Hughes (USA) LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2015 |
| 270 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 271 | Rwa Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 1999 |
| 272 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Apr 2024 |
| 273 | S & JB, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2010 |
| 274 | S & S Energy | Englewood, CO 80112 | Oil & Gas Operator | Mar 2015 |
| 275 | S&JB, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2024 |
| 276 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2024 |
| 277 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 278 | Salt Of The Earth Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2024 |
| 279 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 280 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Apr 2024 |
| 281 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 282 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Apr 2024 |
| 283 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Apr 2024 |
| 284 | Scott Petroleum, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 1995 |
| 285 | Seaco Production | Dripping SPGS, TX 78620 | Oil & Gas Operator | Feb 2016 |
| 286 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 287 | Seay Oil & Gas, LTD. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Apr 2013 |
| 288 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Apr 2024 |
| 289 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2024 |
| 290 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Apr 2024 |
| 291 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 292 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 293 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 294 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 295 | Sharon Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2010 |
| 296 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2024 |
| 297 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Apr 2024 |
| 298 | Showdown Operating, Inc. | Dallas, TX 75230 | Oil & Gas Operator | May 1996 |
| 299 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 300 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Apr 2024 |