| 201 | FM Production | Kilgore, TX 75662 | Oil Operator | Dec 2025 |
| 202 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 203 | Fort Worth Natural Gas, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Dec 2025 |
| 204 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Dec 2025 |
| 205 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 206 | Four Diamond Operating, LLC | Kilgore, TX 75662 | Oil Operator | Dec 2025 |
| 207 | Four-S Oil Co., LTD. | Kilgore, TX 75663 | Oil Operator | Apr 2007 |
| 208 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 209 | Frisco Oil Corporation | Tyler, TX 75701 | Oil & Gas Operator | Mar 2000 |
| 210 | Gel Petroleum, Inc. | Bay City, TX 77414 | Oil & Gas Operator | Dec 2025 |
| 211 | Gemini Energy Company | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 212 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 213 | Geo-Vest Of Texas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2008 |
| 214 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 215 | GGP Exploration, LTD. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 216 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 217 | Glade Operating Co. | Longview, TX 75604 | Oil & Gas Operator | Dec 2025 |
| 218 | Glade Production | Gladewater, TX 75647 | Oil & Gas Operator | Nov 2008 |
| 219 | Gladewater Production Co., Inc. | Gladewater, TX 75647 | Oil & Gas Operator | Nov 1998 |
| 220 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 221 | GM Petroleum | Gulf Breeze, FL 32561 | Oil & Gas Operator | Mar 2014 |
| 222 | Goforth Production Company | Rockdale, TX 76567 | Oil Operator | Feb 2014 |
| 223 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 224 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Dec 2025 |
| 225 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 226 | Granite Oil Company | Austin, TX 78716 | Oil & Gas Operator | Nov 2000 |
| 227 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | Dec 2025 |
| 228 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Dec 2025 |
| 229 | Gregg Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 230 | Griffith Resources | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2013 |
| 231 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 232 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 233 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | Dec 2025 |
| 234 | Gulftex Operating Inc | Plano, TX 75093 | Oil & Gas Operator | Dec 2025 |
| 235 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 236 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | Dec 2025 |
| 237 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | Dec 2025 |
| 238 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 239 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Dec 2025 |
| 240 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 241 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 242 | Heritage Energy Corporation | Waco, TX 76710 | Oil & Gas Operator | Sep 2004 |
| 243 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 244 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 245 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 246 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 247 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 248 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 249 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 250 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 251 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 252 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 253 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 254 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 255 | Idaho Oil Co., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2008 |
| 256 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 257 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 258 | Indigo Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2019 |
| 259 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 260 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 261 | Ironhorse Operations, LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 262 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 263 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2025 |
| 264 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |
| 265 | Jet Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2002 |
| 266 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Dec 2025 |
| 267 | JJRS Investments Inc. | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Dec 2025 |
| 268 | John P. Bogdanich Operating, LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 269 | Johnston & Owen | Tyler, TX 75710 | Oil & Gas Operator | Oct 1997 |
| 270 | Jordan Properties | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 271 | Josey Oil Company | Houston, TX 77019 | Oil & Gas Operator | Jul 2006 |
| 272 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2025 |
| 273 | K Me Company, LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 274 | K-M Oil Company, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 275 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 276 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 277 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 278 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 279 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 280 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 281 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 282 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 283 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 284 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2025 |
| 285 | Keyway Oil & Gas Operating LLC | Kilgore, TX 75663 | Oil Operator | Oct 2020 |
| 286 | Killingsworth, Lee Operator | Longview, TX 75601 | Oil & Gas Operator | Jan 1999 |
| 287 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 288 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 289 | Krog Partners, LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 290 | L & G Oil Company | Longview, TX 75606 | Oil & Gas Operator | Aug 2000 |
| 291 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 292 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 293 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 294 | Lebow, Marvin E. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1997 |
| 295 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 296 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Dec 2025 |
| 297 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 298 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 299 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 300 | Log Operating, LLC | Eagle Pass, TX 78853 | Oil & Gas Operator | Dec 2025 |