| 201 | J Petroleum, Inc. | San Antonio, TX 78247 | Oil & Gas Operator | Aug 2003 |
| 202 | J&J Oil | La Vernia, TX 78121 | Oil & Gas Operator | May 2025 |
| 203 | J-Energy | La Vernia, TX 78121 | Oil & Gas Operator | May 2017 |
| 204 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | May 2025 |
| 205 | J.A.G. Oil & Gas | La Vernia, TX 78121 | Oil & Gas Operator | May 2025 |
| 206 | J.W. Service Company | Smithville, TX 78957 | Oil & Gas Operator | May 2025 |
| 207 | Jarutowicz Oil Company | Floresville, TX 78114 | Oil & Gas Operator | May 2025 |
| 208 | JB Oil & Gas Well Service | Dilley, TX 78017 | Oil & Gas Operator | May 2025 |
| 209 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 210 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 211 | Jennings Exploration Company | Beeville, TX 78102 | Oil & Gas Operator | Feb 2024 |
| 212 | JGC Oil Co. | Austin, TX 78732 | Oil & Gas Operator | May 2025 |
| 213 | Jimco Energy Inc. | Stockdale, TX 78160 | Oil & Gas Operator | May 2025 |
| 214 | Johanson Oil | La Vernia, TX 78121 | Oil Operator | Dec 2023 |
| 215 | Johnson Royalties, Inc. | Austin, TX 78729 | Oil & Gas Operator | Jul 2002 |
| 216 | JSD Oil, LTD. | Seguin, TX 78155 | Oil Operator | Nov 2013 |
| 217 | K And R Oil Company | Stanton, TX 79782 | Oil & Gas Operator | Aug 2003 |
| 218 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 219 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 220 | Karenco Energy, Incorporated | Seguin, TX 78155 | Oil & Gas Operator | Oct 1997 |
| 221 | Karis Resources, LLC | Tyler, TX 75707 | Oil & Gas Operator | Feb 2019 |
| 222 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 223 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 224 | Keahey Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2002 |
| 225 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 226 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 227 | Kingwood Oil Co; Inc | Luling, TX 78648 | Oil & Gas Operator | Nov 2015 |
| 228 | Koch, P. S. | Seguin, TX 78155 | Oil & Gas Operator | May 2018 |
| 229 | La Vernia Oil | La Vernia, TX 78121 | Oil Operator | May 2025 |
| 230 | La Vernia Oil Co. | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 231 | Lambeck Petroleum, LLC | Stockdale, TX 78160 | Oil Operator | May 2025 |
| 232 | Laron Oil Corporation | Seguin, TX 78155 | Oil & Gas Operator | Jul 1997 |
| 233 | Latimer, D. Gail Enterprises,Inc | Snyder, TX 79550 | Oil & Gas Operator | Jul 2004 |
| 234 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 235 | Liberty Head Petroleum, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Sep 2017 |
| 236 | Lindholm Oil, Inc. | Mathis, TX 78368 | Gas Operator | Sep 2002 |
| 237 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 238 | Loma VIsta Farms | Floresville, TX 78114 | Oil & Gas Operator | Jun 2019 |
| 239 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 240 | Longshot Energy LLC | League City, TX 77573 | Oil Operator | May 2025 |
| 241 | Lorenz & Bosanko | San Antonio, TX 78247 | Oil & Gas Operator | May 2025 |
| 242 | Lorenz, J. P., Jr. | La Vernia, TX 78121 | Oil & Gas Operator | Mar 2008 |
| 243 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 244 | LT Oil LLC | San Marcos, TX 78666 | Oil Operator | May 2025 |
| 245 | Lucas Energy, Inc. | Houston, TX 77067 | Oil & Gas Operator | Feb 2017 |
| 246 | Lucros International Corporation | Van Buren, AR 72956 | Oil & Gas Operator | May 2025 |
| 247 | Luling O&G LLC | Cibolo, TX 78108 | Oil & Gas Operator | May 2025 |
| 248 | Luling Well Service | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 249 | Lynch, W. W. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2006 |
| 250 | Lynch, W. Waldo | Uvalde, TX 78801 | Oil & Gas Operator | Jan 1996 |
| 251 | Lynch, Wilbur Waldo, Estate Of | New Braunfels, TX 78130 | Oil & Gas Operator | Oct 2017 |
| 252 | Lynd, J. L., Inc. | Austin, TX 78716 | Oil & Gas Operator | Sep 2009 |
| 253 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 254 | M & C Operating, LLC | Poteet, TX 78065 | Oil Operator | May 2025 |
| 255 | M IV Ops., Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1998 |
| 256 | M. J. G., Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2010 |
| 257 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 258 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | May 2025 |
| 259 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 260 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 261 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 262 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 263 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 264 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 265 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 266 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 267 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 268 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 269 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 270 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 271 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 272 | Meb, LLC | Austin, TX 78737 | Oil Operator | May 2025 |
| 273 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | May 2025 |
| 274 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 275 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 276 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 277 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 278 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 279 | Midway Drilling Co. | Richmond, TX 77469 | Oil & Gas Operator | May 2025 |
| 280 | Miller, W. C. Operating Company | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 281 | Mina Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2012 |
| 282 | Miranda Energy Corporation | Midland, TX 79705 | Oil & Gas Operator | Jun 2016 |
| 283 | More Texas Oil | Von Ormy, TX 78073 | Oil & Gas Operator | May 2025 |
| 284 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 285 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 286 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 287 | Mortimer Production Company | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 288 | Moy, Gary | Falls City, TX 78113 | Oil & Gas Operator | Nov 1998 |
| 289 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 290 | Nautilus Exploration, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 2021 |
| 291 | Nelms Bros. Oil Properties Inc. | Austin, TX 78711 | Oil & Gas Operator | Jun 1996 |
| 292 | New Beginning | Seguin, TX 78156 | Oil Operator | Jun 2016 |
| 293 | New London Oil Inc. | Houston, TX 77253 | Oil & Gas Operator | Aug 2002 |
| 294 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 295 | Niedorf, Patrick Stephen | San Antonio, TX 78239 | Oil Operator | Jul 2001 |
| 296 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | May 2025 |
| 297 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 298 | Nolen Oil & Gas | Beeville, TX 78102 | Oil & Gas Operator | May 2025 |
| 299 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 300 | North Operating Company | Canton, TX 75103 | Oil & Gas Operator | May 2025 |