| 201 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 202 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 203 | Enlo Energy Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 204 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 205 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 206 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 207 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 208 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 209 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Mar 2025 |
| 210 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Mar 2025 |
| 211 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2025 |
| 212 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Mar 2025 |
| 213 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Mar 2025 |
| 214 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Mar 2025 |
| 215 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Mar 2025 |
| 216 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 217 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 218 | F B Operating, Inc. | Montague, TX 76251 | Oil & Gas Operator | Aug 2003 |
| 219 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 220 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 221 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Mar 2025 |
| 222 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 223 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 224 | Fitts, B.K. Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 225 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 226 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 227 | Foxborough Energy Company, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 228 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 229 | Fuse Energy, LLC | Alvord, TX 76225 | Oil & Gas Operator | Jan 2019 |
| 230 | Gardner Production, LLC | Decatur, TX 76234 | Oil & Gas Operator | Jul 2023 |
| 231 | GBG Operating Corp. | Wichita Falls, TX 76302 | Oil & Gas Operator | Sep 1998 |
| 232 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 233 | General Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 234 | Georgetown Operating Company | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2019 |
| 235 | Giant Energy Corp. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2019 |
| 236 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 237 | Gilmore, Leo Oil, Inc. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 238 | Glen D. Gonzenbach, LLC | Henrietta, TX 76365 | Oil & Gas Operator | Dec 2016 |
| 239 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 240 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 241 | Gonzenbach Oil & Gas, LLC | Henrietta, TX 76365 | Oil & Gas Operator | May 2020 |
| 242 | Gonzenbach, Glen D | Henrietta, TX 76365 | Oil & Gas Operator | Aug 2007 |
| 243 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 244 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 245 | Grace, Jack Production Co, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Mar 2025 |
| 246 | Grace, Jack, Prod. Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 1997 |
| 247 | Grace, Pete | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 1996 |
| 248 | Graham Energy LTD | Houston, TX 77024 | Oil & Gas Operator | Mar 1994 |
| 249 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 250 | Grayrock Corp., The | Dallas, TX 75243 | Oil & Gas Operator | Dec 1999 |
| 251 | Great American Resources Inc. | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 252 | Great West Energy & Expl., Inc. | Addison, TX 75001 | Oil & Gas Operator | Mar 2008 |
| 253 | Great West Operating Co., Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 254 | Greco Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 255 | GRS Oil & Gas Company | Irving, TX 75017 | Oil & Gas Operator | Aug 1994 |
| 256 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 257 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 258 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 259 | Hamman, Blake | Graham, TX 76450 | Oil & Gas Operator | Jul 2020 |
| 260 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 261 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 262 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 263 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 264 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 265 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 266 | Hawkbend LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 267 | Haynes & Shirley Production Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Mar 2025 |
| 268 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 269 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 270 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 271 | Heydrick Petroleum Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 272 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 273 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 274 | Hodges, James Aaron | Fort Worth, TX 76179 | Oil & Gas Operator | Mar 2025 |
| 275 | Hodges, Thomas | Alvord, TX 76225 | Oil & Gas Operator | Oct 2002 |
| 276 | Hodges, Tommie Ann | Alvord, TX 76225 | Oil & Gas Operator | Jun 2018 |
| 277 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2025 |
| 278 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Mar 2025 |
| 279 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 280 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Mar 2025 |
| 281 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 282 | I.T. Corporation | Arlington, TX 76016 | Oil & Gas Operator | Mar 2025 |
| 283 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 284 | Incendium Resources LLC | Argyle, TX 76226 | Oil & Gas Operator | Mar 2025 |
| 285 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2025 |
| 286 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 287 | Ipr Energy Partners, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2014 |
| 288 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 289 | J & A Operating | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 290 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 291 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | Mar 2025 |
| 292 | Jackson Petroleum Consulting,Inc | Plano, TX 75075 | Oil & Gas Operator | Sep 2019 |
| 293 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 294 | Jaco, Troy Inc. | Sherman, TX 75091 | Oil & Gas Operator | Mar 2025 |
| 295 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 296 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 297 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 298 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2024 |
| 299 | Jones Energy, LTD. | Austin, TX 78746 | Oil & Gas Operator | Sep 2013 |
| 300 | JRJ Oil & Gas LLC | Grapevine, TX 76099 | Oil & Gas Operator | Mar 2025 |