| 201 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 202 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 203 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Sep 2024 |
| 204 | McCord Exploration Co. | | Oil & Gas Operator | Dec 1990 |
| 205 | McCord-Dale Exploration | | Oil & Gas Operator | May 1986 |
| 206 | McCord-Goodrich Oil Company | | Oil & Gas Operator | Oct 1991 |
| 207 | McCormick Operating Company | | Oil & Gas Operator | Mar 1984 |
| 208 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 209 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 210 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 211 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 212 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 213 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 214 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 215 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 216 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 217 | Minatome Corporation | | Oil & Gas Operator | Sep 1987 |
| 218 | Mobil E&P North America Inc. | | Oil & Gas Operator | Dec 1993 |
| 219 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 220 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 221 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 222 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 223 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 224 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 225 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 226 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 227 | Needham Resources, Inc. | | Oil & Gas Operator | Jan 1998 |
| 228 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 229 | Neuhoff Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 230 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Nov 2024 |
| 231 | Nexen Petroleum U.S.A. Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 232 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 233 | North Central Oil Corp. | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 234 | Northcoast Oil Company | | Oil & Gas Operator | Mar 2009 |
| 235 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 236 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 237 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 238 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 239 | Onshore Exp Cor-La Nat Res Inc | | Oil & Gas Operator | Oct 1978 |
| 240 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 241 | Orx Resources, Inc. | | Oil & Gas Operator | Dec 2009 |
| 242 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Nov 2024 |
| 243 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 244 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Jun 2024 |
| 245 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 246 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 247 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 248 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 249 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Nov 2024 |
| 250 | Pan-Ok Production Company | | Oil & Gas Operator | Jul 2024 |
| 251 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 252 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 253 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 254 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 255 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 256 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Jun 2024 |
| 257 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 258 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jul 2024 |
| 259 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 260 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 261 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 262 | Philip Services/Louisiana Inc. | | Oil Operator | Dec 2000 |
| 263 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 264 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 265 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 266 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 267 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jul 2024 |
| 268 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 269 | Plumb Operating Company, Inc. | | Oil & Gas Operator | Dec 1989 |
| 270 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 271 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 272 | Proton Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 273 | PSC Industrial Outsourcing, LP | | Oil Operator | Jul 2024 |
| 274 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 275 | PXP Louisiana L.L.C. | | Oil & Gas Operator | Nov 2010 |
| 276 | Queen Sand Operating Co. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 277 | Quinoco Petroleum Inc | | Oil & Gas Operator | Dec 1990 |
| 278 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 279 | R360 Environmental Solutions Of La, LLC | | Oil Operator | Jul 2024 |
| 280 | Reef Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2007 |
| 281 | Reserve Oil Inc. | | Oil & Gas Operator | Jan 1980 |
| 282 | Resource Acquisitions Corp. | | Oil & Gas Operator | Dec 2002 |
| 283 | River Bend Operating, Inc. | | Oil & Gas Operator | Jul 1999 |
| 284 | Rockbridge Oil & Gas | Houston, TX 77027 | Oil & Gas Operator | Mar 1990 |
| 285 | Rooster Petroleum, LLC | | Oil & Gas Operator | Feb 2011 |
| 286 | Rosewood Resources (Poc), Inc. | | Oil & Gas Operator | Dec 1984 |
| 287 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 288 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 289 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 290 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 291 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 292 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 293 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 294 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 295 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 296 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 297 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 298 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2024 |
| 299 | Soldier Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 300 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |