| 201 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 202 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 203 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 204 | Huntford Resources Corp | Englewood, CO 80112 | Oil & Gas Operator | Nov 2001 |
| 205 | I. J. Wilhite | | Oil Operator | Apr 2000 |
| 206 | I. J. Wilhite & Star Drilling, Inc. | | Oil Operator | Sep 1973 |
| 207 | Imperial Oil Of North Dakota, Inc. | | Oil & Gas Operator | Jul 2023 |
| 208 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 209 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 210 | Investors Oil, Inc. | | Oil Operator | Mar 1985 |
| 211 | Iron Oil Operating, LLC | | Oil & Gas Operator | Mar 2025 |
| 212 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 213 | J.P. Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 214 | James E. Schulte | | Oil Operator | Apr 2008 |
| 215 | Jayhawk Energy, Inc. | Spokane, WA 99202 | Oil & Gas Operator | May 2016 |
| 216 | Jed Oil USA Inc | | Oil & Gas Operator | Dec 2008 |
| 217 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 218 | Jettison, Inc. | | Oil & Gas Operator | Oct 2025 |
| 219 | John B. Hawley, Jr. Trust #1 | | Oil Operator | Apr 1979 |
| 220 | John L. Cox | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 221 | Jordan Exploration Company, L.L.C. | | Oil & Gas Operator | Mar 2024 |
| 222 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 223 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 224 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 225 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 226 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 227 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 228 | Koda Resources Operating, LLC | | Oil & Gas Operator | Sep 2025 |
| 229 | Kodiak Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 230 | Kraken Development III, LLC | | Oil & Gas Operator | Nov 2021 |
| 231 | Kraken Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 232 | KRB Enterprise, Inc. | | Oil Operator | Oct 2025 |
| 233 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 234 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 235 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 236 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 237 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 238 | Legacy Oil & Gas ND, Inc. | | Oil & Gas Operator | Feb 2016 |
| 239 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 240 | Leland Oil & Gas, LLC | | Oil & Gas Operator | Oct 2025 |
| 241 | Liberty Resources LLC | | Oil & Gas Operator | May 2014 |
| 242 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 243 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 244 | Lime Rock Resources V-A, L.P. | | Oil & Gas Operator | Oct 2025 |
| 245 | Lloyd H. Smith | | Oil & Gas Operator | Mar 1972 |
| 246 | Long Petroleum, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2020 |
| 247 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 248 | Lubar Oil Co. | | Oil Operator | Nov 1983 |
| 249 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 250 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 251 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 252 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 253 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 254 | Mann Oil Company, LLC | | Oil Operator | Jun 2023 |
| 255 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 256 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 257 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 258 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 259 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Oct 2025 |
| 260 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 261 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 262 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 263 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 264 | Medora Minerals, LLC | | Oil & Gas Operator | Oct 2025 |
| 265 | Mercury Resources LLC | | Oil & Gas Operator | Sep 2025 |
| 266 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 267 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 268 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 269 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 270 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 271 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 272 | Missouri Breaks, LLC | | Oil & Gas Operator | Jun 2011 |
| 273 | Missouri River Resources ND, LLC | | Oil & Gas Operator | Oct 2025 |
| 274 | Missouri River Royalty Corporation | Bismarck, ND 58504 | Oil & Gas Operator | Oct 2025 |
| 275 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 276 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 277 | Moore & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1993 |
| 278 | Morgan E&P, LLC | | Oil & Gas Operator | Oct 2025 |
| 279 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 280 | Mountain Divide, LLC | | Oil & Gas Operator | Mar 2017 |
| 281 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2025 |
| 282 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 283 | Nadel And Gussman Rockies, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2012 |
| 284 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 285 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Dec 2025 |
| 286 | Neptune Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 287 | Nerdlihc Company, Inc. | Long Beach, CA 90815 | Oil & Gas Operator | Nov 2006 |
| 288 | New Horizon Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2006 |
| 289 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 290 | New Millennium Resources, Inc. | | Oil & Gas Operator | Oct 2025 |
| 291 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 292 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 293 | Nine Point Energy, LLC | | Oil & Gas Operator | Oct 2021 |
| 294 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 295 | North American Resources Company | Billings, MT 59101 | Oil & Gas Operator | Dec 2019 |
| 296 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 297 | North Plains Energy, LLC | | Oil & Gas Operator | Jan 2016 |
| 298 | North Range Resources, LLC | | Oil & Gas Operator | Nov 2023 |
| 299 | Northern Pump Company | Denver, CO 80202-3130 | Oil & Gas Operator | Feb 2006 |
| 300 | Northwest Exploration Co | Salt Lake City, UT 84108-0900 | Oil & Gas Operator | Sep 1991 |