| 201 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 202 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 203 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 204 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 205 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2025 |
| 206 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 207 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2025 |
| 208 | Huddleston Oil And Gas Company | Millsap, TX 76066 | Gas Operator | Dec 2002 |
| 209 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 210 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 211 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 212 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Apr 2025 |
| 213 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 214 | Incendium Resources LLC | Argyle, TX 76226 | Oil & Gas Operator | Apr 2025 |
| 215 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Apr 2025 |
| 216 | Itx Corporation | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 217 | Itx Pipeline Company, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 218 | J-Tec Operating, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2025 |
| 219 | J-Tec Production, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2025 |
| 220 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Apr 2025 |
| 221 | J.S.B. Oil Company | Hallettsville, TX 77964 | Oil & Gas Operator | Apr 2025 |
| 222 | Jackson Petroleum Consulting,Inc | Plano, TX 75075 | Oil & Gas Operator | Sep 2019 |
| 223 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 224 | Jeff Dooley Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 225 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | Apr 2025 |
| 226 | JJB Operating Co. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2025 |
| 227 | Johnson, William D. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2008 |
| 228 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 229 | K & S Oil & Gas Company, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2025 |
| 230 | K&C Pump Truck, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2018 |
| 231 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 232 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 233 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 234 | Kec Enterprises, Inc. | Springtown, TX 76082 | Oil & Gas Operator | Apr 2025 |
| 235 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2017 |
| 236 | Knickerbocker Land Resources | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2015 |
| 237 | Kroh Operating LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Apr 2025 |
| 238 | L.T.D. Explorations Inc. | Alice, TX 78333 | Oil & Gas Operator | Apr 2025 |
| 239 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 240 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 241 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 242 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 243 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 244 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Apr 2025 |
| 245 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 246 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 247 | Lincoln Energy Partners, LLC | South Dennis, MA 02660 | Oil Operator | Apr 2025 |
| 248 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 249 | LKM Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2024 |
| 250 | LKM Oil And Gas LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 251 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 252 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2025 |
| 253 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 254 | Lyndum, Inc. | Weatherford, TX 76088 | Oil & Gas Operator | Oct 2009 |
| 255 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 256 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Apr 2025 |
| 257 | Maddux Oil & Gas | Strawn, TX 76475 | Oil & Gas Operator | Apr 2025 |
| 258 | Madison And Wright LLC | The Colony, TX 75056 | Oil & Gas Operator | Apr 2025 |
| 259 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 260 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 261 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 262 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 263 | Martin Well Service Company | Mineral Wells, TX 76067 | Oil & Gas Operator | Jul 2006 |
| 264 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 265 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 2025 |
| 266 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 267 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 268 | McKenzie Operating Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 269 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 270 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 271 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 272 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 273 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 274 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 275 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 276 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 277 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 278 | Mills Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 279 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Apr 2025 |
| 280 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 281 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 282 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 283 | MKS Consulting Corporation | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2005 |
| 284 | MKS Natural Gas Company | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2016 |
| 285 | Molsdorf Ag LLC | McAllen, TX 78503 | Oil Operator | Sep 2013 |
| 286 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2025 |
| 287 | Moncrief, C. B. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2021 |
| 288 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 289 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Apr 2025 |
| 290 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Apr 2025 |
| 291 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 292 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2024 |
| 293 | Myers, A. J. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 294 | N. E. Operating Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 295 | Ness Operating Of Texas, Inc. | Weatherford, TX 76087 | Oil & Gas Operator | Dec 2004 |
| 296 | Newark E&P Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2017 |
| 297 | Newark Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 298 | Newton Well Service | New Braunfels, TX 78132 | Oil & Gas Operator | May 2016 |
| 299 | Nichols Oil & Gas Corporation | Shreveport, LA 71135 | Oil & Gas Operator | Aug 2003 |
| 300 | Nordan Oil & Gas Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2018 |