| 201 | Robbins Petroleum Corp. | Longview, TX 75606 | Oil & Gas Operator | Sep 1994 |
| 202 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 203 | Rockcliff Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 204 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 205 | Routh Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2011 |
| 206 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 207 | Royalty Operating, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Nov 2007 |
| 208 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 209 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 210 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 211 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 212 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 213 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 214 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 215 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 216 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 217 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 218 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 219 | Sanhall Corporation | Huntsville, TX 77340 | Oil & Gas Operator | Oct 1993 |
| 220 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 221 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 222 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 223 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 224 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 225 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 226 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Apr 2025 |
| 227 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Apr 2025 |
| 228 | Spence, Ralph Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2023 |
| 229 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 230 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Apr 2025 |
| 231 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 232 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 233 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Apr 2025 |
| 234 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Apr 2025 |
| 235 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |
| 236 | Sugar Enterprises, LLC | Tyler, TX 75713 | Oil & Gas Operator | Apr 2025 |
| 237 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Apr 2025 |
| 238 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 239 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 240 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 241 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2025 |
| 242 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 243 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 244 | Texas, Les & Co. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 245 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 246 | Thor Operating Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 1995 |
| 247 | Three Forks Operating Co, LLC | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2025 |
| 248 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Apr 2025 |
| 249 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 250 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 251 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 252 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 253 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 254 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 255 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 256 | Vista Resources LLC | Teague, TX 75860 | Oil & Gas Operator | Apr 2025 |
| 257 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 258 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 259 | Warrior Resources Inc. | Mexia, TX 76667 | Oil & Gas Operator | Apr 2025 |
| 260 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 261 | White Rock Exploration, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2021 |
| 262 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 263 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 264 | Wmo Oil, LLC | Kilgore, TX 75663 | Oil Operator | Apr 2025 |
| 265 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 266 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 267 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 268 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 269 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 270 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2025 |