| 201 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 202 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 203 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 204 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 205 | Ibex Resources I, L.P. | Midland, TX 79701 | Oil & Gas Operator | Jul 1999 |
| 206 | Ibex Resources Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 207 | Independence Resources MGMT, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2021 |
| 208 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 209 | Irion Corporation, The | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2021 |
| 210 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 211 | Ivory Energy, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 212 | J & J Services Company | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 213 | Jaco Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Apr 1998 |
| 214 | JB Production Company | Denton, TX 76202 | Oil & Gas Operator | Jul 2004 |
| 215 | Jim-Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2003 |
| 216 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 217 | Johnson, Charles | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 218 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Dec 2025 |
| 219 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 220 | Kodiak Productions LTD | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2014 |
| 221 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 222 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 223 | Lainco, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Dec 2025 |
| 224 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 225 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Dec 2025 |
| 226 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 227 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 228 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 229 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Dec 2025 |
| 230 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 231 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 232 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 233 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 234 | Lipan Flats Production, L.L.C. | San Angelo, TX 76905 | Oil Operator | Dec 2025 |
| 235 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Sep 2025 |
| 236 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 237 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 238 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 239 | Los Hijos De Sanchez J LLC | Beeville, TX 78102 | Oil Operator | Dec 2025 |
| 240 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Dec 2025 |
| 241 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 242 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Dec 2025 |
| 243 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2025 |
| 244 | Madera, R. F. | Palm Desert, CA 92210 | Oil & Gas Operator | Sep 2000 |
| 245 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 246 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 247 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 248 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 249 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 250 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 251 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Dec 2025 |
| 252 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 253 | MCD, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 254 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 255 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |
| 256 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Dec 2025 |
| 257 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 258 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 259 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 260 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 261 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 262 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 263 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 264 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 265 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 266 | Millennium Resources, LLC. | Big Lake, TX 76932 | Oil & Gas Operator | Sep 2012 |
| 267 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 268 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 269 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 270 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 271 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 272 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 273 | Moore, John D. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 274 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 275 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 276 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 277 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 278 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Aug 2025 |
| 279 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 280 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 281 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 282 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 283 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Dec 2025 |
| 284 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 285 | North American Drilling Corp | Plano, TX 75093 | Oil & Gas Operator | Dec 2025 |
| 286 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 287 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 288 | Offset Oil & Gas | Big Spring, TX 79720 | Oil & Gas Operator | Aug 2003 |
| 289 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 290 | Oil & Gas Properties | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 291 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Dec 2025 |
| 292 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 293 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 294 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 295 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2025 |
| 296 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 297 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 298 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 299 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | Dec 2025 |
| 300 | Pace Production Co. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |