| 201 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 202 | Prospective Investment & Trding Co LTD | | Oil & Gas Operator | Sep 2012 |
| 203 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Dec 2025 |
| 204 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 205 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 206 | Rabalais Oil And Gas, Inc. | | Oil & Gas Operator | Sep 2023 |
| 207 | Range Louisiana Operating, LLC | | Oil & Gas Operator | Aug 2020 |
| 208 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 209 | Red River Gas Company | | Oil & Gas Operator | May 2000 |
| 210 | Red River Oil & Gas Inc. | | Oil & Gas Operator | May 2012 |
| 211 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 212 | Regency Gas Gathrng & Proc LLC | | Oil Operator | Sep 2007 |
| 213 | Regency Intrastate Gas LLC | | Oil Operator | Feb 2009 |
| 214 | Reliant Energy Field SVS Inc. | | Oil Operator | Sep 2002 |
| 215 | Richard B. Nelson,Etal | | Oil & Gas Operator | May 1979 |
| 216 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 217 | Robert G Cox & Assoc La Inc. | | Oil & Gas Operator | Jun 1994 |
| 218 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 219 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 220 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 221 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 222 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 223 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 224 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 225 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 226 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 227 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 228 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 229 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 230 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 231 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Feb 2026 |
| 232 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 233 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 234 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 235 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 236 | Tellus Operating Group, LLC | | Oil & Gas Operator | Nov 2025 |
| 237 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 238 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 239 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 240 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 241 | Texona Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 242 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 243 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 244 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 245 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Feb 2026 |
| 246 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 247 | Trafalgar House Oil & Gas Inc | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 248 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 249 | Txo Prod Corp.-Arkla Expl. Co. | | Oil & Gas Operator | Dec 1990 |
| 250 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 251 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 252 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 253 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 254 | Union Texas Petroleum Corp | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 255 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2026 |
| 256 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 257 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 |
| 258 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 259 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 260 | Vista Corporation | | Oil & Gas Operator | Jan 2011 |
| 261 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Feb 2026 |
| 262 | Watchtower Petroleum, LLC | | Oil & Gas Operator | Jun 2025 |
| 263 | Wessely Energy Company | Dallas, TX 75206 | Oil & Gas Operator | May 2001 |
| 264 | Wessely Energy Corporation | | Oil & Gas Operator | Feb 1989 |
| 265 | Wheless Drilling Company | | Oil & Gas Operator | Dec 1989 |
| 266 | Wheless Drilling Company Et Al | | Oil & Gas Operator | Dec 1989 |
| 267 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 268 | Wildhorse Resources Management Co, LLC | | Oil & Gas Operator | Feb 2018 |
| 269 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 270 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 271 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 272 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 273 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 274 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 275 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 276 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 277 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 278 | Zadeck Energy Group, Inc. | | Oil & Gas Operator | Dec 2011 |