| 201 | Kernview Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 202 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 203 | KMP Operating Inc. | | Oil Operator | Mar 2025 |
| 204 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Jan 2025 |
| 205 | L P Oil Company Inc. | | Oil & Gas Operator | Mar 2025 |
| 206 | La Paloma Generating Company LLC | | Oil & Gas Operator | Dec 2000 |
| 207 | Las Palmas Petroleum Corp. | | Oil Operator | Dec 2010 |
| 208 | Laymac Corporation | | Gas Operator | Dec 2020 |
| 209 | LDD Energy LLC | | Oil & Gas Operator | Feb 2025 |
| 210 | Lee Lamberson Inc. | | Oil & Gas Operator | Dec 2000 |
| 211 | Legacy Energy Inc | Carpinteria, CA 93013 | Oil & Gas Operator | Jun 2012 |
| 212 | Linn Western Operating Inc. | | Oil & Gas Operator | Jan 2018 |
| 213 | Little Creek Properties Inc. | | Oil Operator | Feb 2025 |
| 214 | Lobo Operations LLC | | Oil Operator | Mar 2025 |
| 215 | Longbow LLC | | Oil & Gas Operator | Mar 2025 |
| 216 | M. D. & G. Partnership | | Oil & Gas Operator | Dec 1996 |
| 217 | M. H. Whittier Energy LLC | | Oil & Gas Operator | Sep 1996 |
| 218 | M.T. Oil Co. | Copan, OK 74022 | Oil Operator | Feb 2025 |
| 219 | Macpherson Oil Company | | Oil & Gas Operator | Feb 2025 |
| 220 | Macpherson Operating Company L.P. | | Oil & Gas Operator | Feb 2025 |
| 221 | Maranatha Petroleum Inc. | | Oil & Gas Operator | Feb 2025 |
| 222 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 223 | Marathon Oil Company Operator | | Oil & Gas Operator | Dec 1993 |
| 224 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 225 | Matrix Oil Corporation | | Oil & Gas Operator | Mar 2025 |
| 226 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 227 | Maxoil Inc. | | Oil & Gas Operator | Dec 2004 |
| 228 | Maya Oil LLC | | Oil Operator | Feb 2025 |
| 229 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 230 | McLennan Family Properties LLP | | Oil & Gas Operator | Dec 2021 |
| 231 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 232 | Midway-Sunset Investors LLC | | Oil & Gas Operator | Mar 2025 |
| 233 | Mission Oil Company | | Oil & Gas Operator | Feb 2025 |
| 234 | Mission Resources | | Oil & Gas Operator | Dec 1991 |
| 235 | Mitchell Oil | | Oil Operator | Feb 2025 |
| 236 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 237 | Mobil Oil Exploration & Production North America Inc. | | Oil & Gas Operator | Dec 1996 |
| 238 | Monterey Resources Inc. | | Oil & Gas Operator | Dec 1997 |
| 239 | Monument Production Inc. | | Oil & Gas Operator | Dec 2011 |
| 240 | Morrison Oil Co. LLC | | Oil & Gas Operator | Feb 2025 |
| 241 | Mountain VIew Resources LLC | | Oil & Gas Operator | Mar 2025 |
| 242 | Naftex Operating Company | | Oil & Gas Operator | Mar 2025 |
| 243 | Nahama & Weagant Energy Company | | Oil & Gas Operator | Dec 1997 |
| 244 | Natural Gas Corp. Of Calif. | | Oil & Gas Operator | Dec 1987 |
| 245 | Neon Energy Corporation | | Oil Operator | Apr 2014 |
| 246 | New Chaparral Petroleum Inc. | | Oil & Gas Operator | Dec 2005 |
| 247 | Newbridge Resources, LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 248 | NMT Oil Company Inc. | | Oil & Gas Operator | Mar 2025 |
| 249 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 250 | Nordic Oil Company | | Oil & Gas Operator | Dec 1999 |
| 251 | North Of River Sanitary District | | Oil & Gas Operator | Dec 2002 |
| 252 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 253 | Northwest Petroleum Inc. | | Oil & Gas Operator | Feb 2025 |
| 254 | O'Brien-Sill | | Oil & Gas Operator | Mar 2025 |
| 255 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 256 | Occidental Of Elk Hills Inc. | | Oil & Gas Operator | Dec 2014 |
| 257 | Occidental Petroleum Corporation | | Oil & Gas Operator | Dec 2021 |
| 258 | Ogle Petroleum Inc. | | Oil & Gas Operator | Dec 1989 |
| 259 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 260 | Oro Negro Inc. | | Oil & Gas Operator | Dec 2004 |
| 261 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 262 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 263 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 264 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Mar 2025 |
| 265 | Pace Diversified Corporation | | Oil & Gas Operator | Feb 2025 |
| 266 | Pacific Energy Resources Inc. | | Oil Operator | Feb 2025 |
| 267 | Pacific Energy Resources LTD | | Oil & Gas Operator | Sep 2009 |
| 268 | Pan American Energy Corporation | | Oil & Gas Operator | Dec 1998 |
| 269 | Pancanadian Petroleum Company | | Oil & Gas Operator | Oct 1989 |
| 270 | Parlay Oil Company | | Oil Operator | Dec 2002 |
| 271 | Paul M. Woodward | | Oil Operator | Feb 2025 |
| 272 | Pennant Petroleum Corporation | | Oil Operator | Dec 2002 |
| 273 | Petro Capital Resources LLC | | Oil & Gas Operator | Feb 2025 |
| 274 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | May 2025 |
| 275 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 276 | Petro-Lud Inc. | | Oil & Gas Operator | Mar 2025 |
| 277 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 278 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 279 | Petrowest | | Oil & Gas Operator | Dec 2001 |
| 280 | Philip R. McPharlin | | Oil & Gas Operator | Dec 1995 |
| 281 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 282 | Pine Meadows Ranch Incorporated | | Oil & Gas Operator | Dec 2001 |
| 283 | Polaris Production Inc. | | Oil & Gas Operator | Feb 2021 |
| 284 | Pool California Energy Services Inc. | | Oil Operator | Dec 2009 |
| 285 | Portals Woodward Joint Venture | | Oil Operator | Dec 2000 |
| 286 | Poso Creek Energy LLC | | Oil & Gas Operator | Dec 2009 |
| 287 | Powerdrive Energy Services Company LLC | | Oil & Gas Operator | Feb 2025 |
| 288 | Premier Pumping Unit Services Inc. | | Oil & Gas Operator | Mar 2025 |
| 289 | Preuitt Production Service | | Oil Operator | Feb 2025 |
| 290 | Princeton Natural Gas LLC | | Gas Operator | Feb 2025 |
| 291 | Production Specialties Company | | Oil & Gas Operator | Dec 2003 |
| 292 | Protho Energy Service LLC | | Oil & Gas Operator | Mar 2025 |
| 293 | Pyramid Oil Co. | Litchfield PK, AZ 85340 | Oil & Gas Operator | Jan 2018 |
| 294 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 295 | R&R Resources LLC | | Oil & Gas Operator | Feb 2025 |
| 296 | R. J. Bellevue | | Oil & Gas Operator | Feb 2025 |
| 297 | R. W. Henry | | Oil & Gas Operator | Dec 1999 |
| 298 | Raak-Wilson Properties | | Oil & Gas Operator | Dec 1999 |
| 299 | Rare Petro Exploration LLC | | Oil & Gas Operator | Mar 2025 |
| 300 | Razar Resources | | Oil & Gas Operator | Dec 2000 |