| 301 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 302 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 303 | Hub-Hill Inc | San Antonio, TX 78230 | Oil Operator | Nov 1998 |
| 304 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 305 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 306 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 307 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 308 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 309 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 310 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Mar 2025 |
| 311 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 312 | J C Petroleum Inc | Chickasha, OK 73023-1433 | Oil & Gas Operator | Dec 2013 |
| 313 | Jac-Mac Energy Corporation | Oklahoma City, OK 73170 | Oil & Gas Operator | Mar 2025 |
| 314 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Mar 2025 |
| 315 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 316 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Mar 2025 |
| 317 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 318 | JKB Resources LLC | Stigler, OK 74462 | Oil & Gas Operator | Feb 2025 |
| 319 | Jma Energy Company, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 320 | JNC Resources Company | Tulsa, OK 74119 | Gas Operator | May 1999 |
| 321 | Jo-Allyn Oil Co Inc | Laverne, OK 73848 | Oil & Gas Operator | Mar 2025 |
| 322 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 323 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 324 | JWD Oil & Gas LLC | Oklahoma City, OK 73116-9039 | Oil Operator | Mar 2025 |
| 325 | K Phil Fleetwood Oil Properties LLC | Marlow, OK 73055 | Oil & Gas Operator | Mar 2025 |
| 326 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 327 | Kamco Hot Oil Service Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2025 |
| 328 | Kardaleff Steven T | Lawton, OK 73507-8471 | Oil Operator | Mar 2015 |
| 329 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Feb 2025 |
| 330 | Kechi Energy LLC | Chickasha, OK 73018 | Oil & Gas Operator | Mar 2025 |
| 331 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 332 | Kelmar Oil Company | Chickasha, OK 73018 | Oil & Gas Operator | Mar 2025 |
| 333 | Kepasa Corp | Oklahoma City, OK 73106 | Oil & Gas Operator | Mar 2025 |
| 334 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 335 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 336 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 337 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 338 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 339 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Mar 2025 |
| 340 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 341 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Mar 2025 |
| 342 | Kirby Exploration Co | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 343 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 344 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 345 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 346 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | Mar 2025 |
| 347 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 348 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Mar 2025 |
| 349 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 350 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | May 2025 |
| 351 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2025 |
| 352 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Mar 2025 |
| 353 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 354 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 355 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Mar 2025 |
| 356 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 357 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 358 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 359 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 360 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 361 | Linam Harry Dba Sooner State Production | Marlow, OK 73055-0583 | Oil & Gas Operator | Apr 2015 |
| 362 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 363 | Little Bear Resources LLC | Stillwater, OK 74074-1388 | Oil & Gas Operator | Feb 2013 |
| 364 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2025 |
| 365 | Locators Oil And Gas Inc | Guthrie, OK 73044 | Oil & Gas Operator | Oct 2022 |
| 366 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | May 2025 |
| 367 | Longacre Oil & Gas | Enid, OK 73702 | Oil & Gas Operator | Mar 2013 |
| 368 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Feb 2025 |
| 369 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 370 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 371 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Mar 2025 |
| 372 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 373 | LX4, LLC | | Oil Operator | Mar 2025 |
| 374 | Lynx Oklahoma Operating LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 375 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 376 | Lyon Energy, Inc. | Plano, TX 75075 | Oil & Gas Operator | Feb 2000 |
| 377 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Feb 2025 |
| 378 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Mar 2025 |
| 379 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Mar 2025 |
| 380 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 381 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Feb 2025 |
| 382 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 383 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 384 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 385 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 386 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Jan 2025 |
| 387 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 388 | Martin Production Corporation | Graham, TX 76450 | Oil Operator | Mar 2025 |
| 389 | Mason Oil Inc | Blanchard, OK 73010-2903 | Oil & Gas Operator | Feb 2009 |
| 390 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 391 | Maxwell Resources Corporation | Oklahoma City, OK 73116-7746 | Oil & Gas Operator | Apr 2009 |
| 392 | McCorgary Martin E | Arkansas City, KS 67005-5452 | Oil & Gas Operator | Feb 2025 |
| 393 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |
| 394 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 395 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 396 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 397 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 398 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 399 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 400 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |