| 201 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 202 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 203 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 204 | Petronova, LLC | | Gas Operator | Jul 2014 |
| 205 | Petrus Oil Company, L.P. | | Oil & Gas Operator | Dec 1989 |
| 206 | PGP Operating, LLC | Vance, AL 35490 | Gas Operator | Oct 2025 |
| 207 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 208 | Phoenix Resources-Alabama, LLC | | Gas Operator | Nov 2004 |
| 209 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 210 | Pollard Operating, LLC | | Oil Operator | May 2001 |
| 211 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 212 | Professional Petroleum Services, Inc. | | Gas Operator | Nov 1997 |
| 213 | Prospective Investment & Trading Co., LTD. | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 214 | Pruet & Hughes | | Oil & Gas Operator | Jul 1977 |
| 215 | Pruet & Hughes Operating Co. | | Oil & Gas Operator | May 1981 |
| 216 | Pruet - Hughes Company | | Oil & Gas Operator | Jan 1978 |
| 217 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Nov 2025 |
| 218 | Pruet Production Co. & Moon & Hines | | Oil & Gas Operator | Jun 2013 |
| 219 | Pruet Production Co.-Midroc Oper. Co. & Watkins, H. Vaughan,Jr. | | Oil & Gas Operator | Sep 1994 |
| 220 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 221 | Ram Petroleum, LLC | Tylertown, MS 39667 | Oil & Gas Operator | Nov 2025 |
| 222 | Reliance Trust | | Oil Operator | Dec 1960 |
| 223 | Richland Resources, Inc. | | Oil & Gas Operator | Aug 1990 |
| 224 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 225 | Rockbridge Oil And Gas, Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1997 |
| 226 | Roundtree & Associates, Inc. | | Oil & Gas Operator | Jun 2024 |
| 227 | S. Lavon Evans Jr., Operating Co., Inc. | | Oil & Gas Operator | Aug 2014 |
| 228 | Saga Petroleum Limited Liability Company Of Colorado | | Gas Operator | Dec 2014 |
| 229 | Saga Resource Management LLC | | Gas Operator | Oct 2025 |
| 230 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 231 | Sanford Resources Corp. | | Oil & Gas Operator | Jul 1998 |
| 232 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 233 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 234 | Signal, LLC | | Oil & Gas Operator | Oct 2025 |
| 235 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 236 | Skelton, D.W. | | Oil Operator | Dec 1952 |
| 237 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 238 | Smackco, LTD. | | Oil & Gas Operator | Oct 2002 |
| 239 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 240 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 241 | South Carlton Operating Company, LLC | | Oil Operator | Sep 2025 |
| 242 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 243 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 244 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 245 | Spooner Petroleum Company | | Oil & Gas Operator | Oct 2025 |
| 246 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 247 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Dec 2025 |
| 248 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 249 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 250 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 251 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 252 | T. K. Stanley, Inc. | | Oil & Gas Operator | Jul 1982 |
| 253 | Taurus Exploration, Inc. | | Oil & Gas Operator | Oct 2025 |
| 254 | TC3 Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Jul 1996 |
| 255 | Teco Coalbed Methane, Inc. | | Gas Operator | Sep 1993 |
| 256 | Tecton Energy Operating LLC | | Oil Operator | Apr 2009 |
| 257 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 258 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 259 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 260 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 261 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 262 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 263 | Tidelands Resources, Inc. | | Gas Operator | Oct 1990 |
| 264 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 265 | Tre'J Exploration, Inc. | | Gas Operator | Dec 1991 |
| 266 | Triangle Operating Co., Inc. | | Gas Operator | Jan 2000 |
| 267 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 268 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 269 | U.S. Steel Mining Co., Inc. | | Gas Operator | Jan 2000 |
| 270 | U.S. Steel Mining Co., LLC | | Gas Operator | Oct 2002 |
| 271 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 272 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 273 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 274 | Unit Manager, Citronelle Unit | | Oil & Gas Operator | Sep 2001 |
| 275 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Dec 2025 |
| 276 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 277 | Venture Oil & Gas, Inc. | Laurel, MS 39440 | Oil & Gas Operator | Nov 2025 |
| 278 | Venus Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 279 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 280 | W&T Offshore, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 281 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 282 | Walter Black Warrior Basin LLC | | Gas Operator | Dec 2014 |
| 283 | Warrior Met Coal Gas, LLC | Brookwood, AL 35444 | Gas Operator | Oct 2025 |
| 284 | West Barrytown Services, LLC | Gilbertown, AL 36908 | Oil & Gas Operator | Mar 2020 |
| 285 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 286 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 287 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 288 | Williams, Clayton W., Jr. | | Oil & Gas Operator | Jun 1989 |
| 289 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 290 | Yarberry, E. E. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2015 |
| 291 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |