| 201 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 202 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 203 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 204 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 205 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 206 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 207 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 208 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 209 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 210 | L E Carpenter Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1985 |
| 211 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Apr 2026 |
| 212 | La. Fete Oil & Gas, Inc. | | Oil & Gas Operator | May 1995 |
| 213 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 214 | La. Onshore Properties Inc. | | Oil & Gas Operator | Dec 2000 |
| 215 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 216 | Lakeside Resources | | Oil & Gas Operator | Mar 1989 |
| 217 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 218 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 219 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 220 | Lavino Oil And Gas Company | | Oil & Gas Operator | Aug 1989 |
| 221 | Leeward Operators LLC | | Oil & Gas Operator | Jul 2011 |
| 222 | Leger Production Company, Inc. | | Oil & Gas Operator | Apr 1984 |
| 223 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Apr 2026 |
| 224 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 225 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 226 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 227 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Apr 2026 |
| 228 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 229 | Longhorn Oil & Gas Company | | Oil & Gas Operator | Sep 1982 |
| 230 | Louisiana Gas System, Inc. | | Oil Operator | Apr 2004 |
| 231 | Luca Operation, LLC | | Oil & Gas Operator | Feb 2016 |
| 232 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 233 | M & M Investments | | Oil & Gas Operator | May 1990 |
| 234 | M. P. S. Prod. Co. | Houston, TX 77225 | Oil & Gas Operator | Dec 1996 |
| 235 | Mammoth Service Group, LLC | | Oil & Gas Operator | Dec 2025 |
| 236 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Apr 2026 |
| 237 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 238 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 239 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 240 | Mark Producing Inc | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 241 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 242 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 243 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 244 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 245 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 246 | Mbo, LLC | | Oil Operator | Jan 2025 |
| 247 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 248 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Apr 2026 |
| 249 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 250 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |
| 251 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 252 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 253 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 254 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 255 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 256 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 257 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 258 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 259 | Miller Oil Field Services, Inc | | Oil Operator | Feb 1990 |
| 260 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 261 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 262 | Moore Oil & Gas-Marion Corp. | | Oil & Gas Operator | Nov 1986 |
| 263 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 264 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 265 | MVM Resources Louisiana L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 266 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 267 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 268 | National Exploration Company | | Oil & Gas Operator | Mar 1982 |
| 269 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 270 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Aug 2025 |
| 271 | Newhaven Operating Inc | | Oil & Gas Operator | Dec 1998 |
| 272 | Nicco Operating Co. | | Oil & Gas Operator | May 1990 |
| 273 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 274 | Nucorp Energy, Inc. | | Oil & Gas Operator | Jan 1985 |
| 275 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 276 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 277 | Oleum Inc | | Oil & Gas Operator | Mar 1996 |
| 278 | Oleum Operating Company, L.C. | Longview, TX 75606 | Oil & Gas Operator | Dec 2021 |
| 279 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2026 |
| 280 | Onyxx Energy LLC | | Oil & Gas Operator | Mar 2017 |
| 281 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 282 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 283 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 284 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2026 |
| 285 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 286 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 287 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 288 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 289 | Perdura Energy L.L.C. | | Oil & Gas Operator | Apr 2018 |
| 290 | Petrocana,Inc. | | Oil & Gas Operator | Aug 1993 |
| 291 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 292 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Apr 2026 |
| 293 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Apr 2026 |
| 294 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 295 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 296 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 297 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 298 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 299 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 300 | Pilot Resources, Inc. | | Oil & Gas Operator | May 2013 |