| 201 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Apr 2024 |
| 202 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 203 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 204 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 205 | M A S Operators | Kilgore, TX 75663 | Oil & Gas Operator | Jul 1999 |
| 206 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Apr 2024 |
| 207 | M. Grace, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |
| 208 | M5 Standing Energy, LLC | Decatur, TX 76234 | Oil & Gas Operator | Apr 2024 |
| 209 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 210 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 211 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 212 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 213 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 214 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 215 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 216 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 217 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Apr 2024 |
| 218 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 219 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 220 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 221 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Oct 2022 |
| 222 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 223 | Miller Production Co. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 224 | Miller, Mike / Miller Prod. Co. | Corsicana, TX 75110 | Oil & Gas Operator | Apr 2024 |
| 225 | MLB Operating Services, LLC | Tenn Colony, TX 75861 | Oil & Gas Operator | Apr 2024 |
| 226 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 227 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 228 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 229 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Apr 2024 |
| 230 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2024 |
| 231 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |
| 232 | Neches Oil & Gas Company, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 233 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 234 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 235 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 236 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 237 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 238 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Apr 2024 |
| 239 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Apr 2024 |
| 240 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 241 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 242 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Apr 2024 |
| 243 | Omni Oil & Gas, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2017 |
| 244 | One Tec Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2011 |
| 245 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 246 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 247 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 248 | Palisades Operating Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 249 | Palmer Petroleum Inc. | Shreveport, LA 71106 | Oil & Gas Operator | Apr 2024 |
| 250 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 251 | Park & Park Oil Co. | Allen, TX 75002 | Oil & Gas Operator | Apr 2024 |
| 252 | Parten Operating Inc. | Houston, TX 77069 | Oil & Gas Operator | Apr 2024 |
| 253 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 254 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 255 | PDH Enterprises | Pittsburg, TX 75686 | Oil & Gas Operator | Apr 2019 |
| 256 | Peles, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 257 | Permian Natural Resources | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 258 | Perryman Exp. And Prod., LLC | Athens, TX 75751 | Oil & Gas Operator | Apr 2024 |
| 259 | Perryman Operating Company | Athens, TX 75751 | Oil & Gas Operator | Apr 2024 |
| 260 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 261 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2024 |
| 262 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 263 | Petromac, Inc. | Onalaska, TX 77360 | Oil & Gas Operator | Apr 2024 |
| 264 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Apr 2024 |
| 265 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 266 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 267 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 268 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Feb 2024 |
| 269 | Pintail Production Co., Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2024 |
| 270 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 271 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Apr 2024 |
| 272 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 273 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Apr 2024 |
| 274 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 275 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 276 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 277 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |
| 278 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2024 |
| 279 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Apr 2024 |
| 280 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 281 | Ranger Investments, Inc. | Longview, TX 75605 | Oil & Gas Operator | Nov 2006 |
| 282 | Rawlins Operating Company, LLC | Elkhart, TX 75839 | Oil & Gas Operator | Apr 2024 |
| 283 | Rebel Production Company | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 284 | Recon Oil Co. | Emory, TX 75440 | Oil & Gas Operator | Apr 2024 |
| 285 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 286 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2024 |
| 287 | Rheata Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 288 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 289 | Ridley Oil Corporation | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 290 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 291 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 292 | Rock Bottom Oil, GP, L.L.C. | Austin, TX 78747 | Oil & Gas Operator | Apr 2024 |
| 293 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 294 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 295 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | Apr 2024 |
| 296 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 297 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 298 | Ross-Rippy | Tyler, TX 75702 | Oil & Gas Operator | Oct 2002 |
| 299 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 300 | Rowan-Ungerecht, Inc. | Van, TX 75790 | Oil & Gas Operator | Sep 1993 |