| 201 | Martin Gas Sales, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | May 1993 |
| 202 | Martin Matrix Inc. | San Angelo, TX 76905 | Oil & Gas Operator | Mar 2025 |
| 203 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Dec 2024 |
| 204 | Martin Oil & Gas Inc. | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 205 | Martin Oil Co. | Aspermont, TX 79502 | Oil & Gas Operator | Jul 2023 |
| 206 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Nov 2024 |
| 207 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 208 | Martin Well Service | Graham, TX 76450 | Oil & Gas Operator | Jun 2015 |
| 209 | Martin Well Service Company | Mineral Wells, TX 76067 | Oil & Gas Operator | Jul 2006 |
| 210 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2025 |
| 211 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 212 | Martin, Pat Jr. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2019 |
| 213 | Martin, Tim | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2003 |
| 214 | Martin, William C. | Houston, TX 77071 | Oil & Gas Operator | Mar 2025 |
| 215 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 216 | Martino, Joseph C. | Pasadena, TX 77504 | Oil & Gas Operator | Mar 2025 |
| 217 | Martis Valley Energy, LLC | Wichita Falls, TX 76310 | Oil Operator | Mar 2025 |
| 218 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 219 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 220 | Marymac Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2001 |
| 221 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 222 | Masa Energy LLC | Houston, TX 77094 | Oil & Gas Operator | Mar 2025 |
| 223 | Masada Development Company | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2021 |
| 224 | Masada Oil & Gas | Quanah, TX 79252 | Oil & Gas Operator | Mar 2025 |
| 225 | Masada Oil & Gas Company LTD. | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 226 | Mascot Oil Company | Schulenburg, TX 78956 | Oil & Gas Operator | Mar 2025 |
| 227 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 228 | Mass Energy, Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 229 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 230 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 231 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2025 |
| 232 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 233 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 234 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 235 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 236 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 237 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 238 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 239 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 240 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Mar 2025 |
| 241 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 242 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 243 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 244 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Jan 2025 |
| 245 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 246 | Maverick Brothers Operating,Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 247 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 248 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 249 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 250 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 251 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Mar 2025 |
| 252 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Mar 2025 |
| 253 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 254 | Maverick Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 255 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 256 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 257 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 258 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 259 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Dec 2024 |
| 260 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 261 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 262 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 263 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 264 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 265 | Maxwell Resources Corporation | Oklahoma City, OK 73116-7746 | Oil & Gas Operator | Apr 2009 |
| 266 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 267 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 268 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 269 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 270 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Mar 2025 |
| 271 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 272 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Mar 2025 |
| 273 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2025 |
| 274 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 275 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 276 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 277 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 278 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Mar 2025 |
| 279 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 280 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 281 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 282 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Mar 2025 |
| 283 | Mazel Oil & Gas Co. | Austin, TX 78768 | Gas Operator | Jan 1994 |
| 284 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Mar 2025 |
| 285 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 286 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 287 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 288 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 289 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Mar 2025 |
| 290 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Mar 2025 |
| 291 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 292 | MC1 Consulting, Inc. | San Antonio, TX 78209 | Oil Operator | Mar 2025 |
| 293 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 294 | McAlester Fuel Co | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 295 | McAnear Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Dec 2002 |
| 296 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 297 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 298 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Mar 2025 |
| 299 | McBee, Jim Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2012 |
| 300 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |