| 201 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 202 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 203 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 204 | Robbins Energy, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1994 |
| 205 | Robinett Resources Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 1999 |
| 206 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 207 | Rooster Production, LLC | Oil City, LA 71061 | Oil Operator | Jan 2025 |
| 208 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 209 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 210 | Rusk Energy Management, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 211 | S M K Energy Corporation | Corpus Chrsti, TX 78475 | Oil & Gas Operator | May 2025 |
| 212 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | May 2025 |
| 213 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 214 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 215 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 216 | Savannah Oil Co. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2007 |
| 217 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 218 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 219 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 220 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 221 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 222 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 223 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 224 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 225 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 226 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 227 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 228 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 229 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 230 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 231 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 232 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 233 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 234 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 235 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 236 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 237 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | May 2025 |
| 238 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 239 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | May 2025 |
| 240 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 241 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 242 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 243 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 244 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | May 2025 |
| 245 | Thunderbird (Texas) Resources LP | Edmond, OK 73025 | Oil & Gas Operator | Apr 2019 |
| 246 | Tipco Operating Co. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 247 | Tompkins, Kevin D. | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 248 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 249 | Triple L Operating Company LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 250 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 251 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 252 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | May 2025 |
| 253 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2025 |
| 254 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 255 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 256 | Whatley, O.B. Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | May 2025 |
| 257 | Whelan Brothers, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2015 |
| 258 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 259 | Wilson Energy Resources LLC | Graham, TX 76450 | Oil Operator | May 2025 |
| 260 | Winchester Production Co., LTD. | Shreveport, LA 71129 | Oil & Gas Operator | Sep 2008 |
| 261 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 262 | WSF, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2013 |
| 263 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 264 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 265 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |