| 301 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 302 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 303 | Headington Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 1992 |
| 304 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 305 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 306 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 307 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Mar 2025 |
| 308 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 309 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 310 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 311 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Apr 2025 |
| 312 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | May 2025 |
| 313 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 314 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 315 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 316 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Apr 2025 |
| 317 | Homer Oil Co LLC | Holdenville, OK 74848-3232 | Oil Operator | May 2025 |
| 318 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 319 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 320 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 321 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Apr 2025 |
| 322 | Husky Petroleum | Seminole, OK 74818-1181 | Oil Operator | Feb 2012 |
| 323 | Icon Energy Company | Oklahoma City, OK 73156-1613 | Oil & Gas Operator | Apr 2025 |
| 324 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 325 | Indian Nation Energy Company | Wewoka, OK 74884-3456 | Oil & Gas Operator | Apr 2020 |
| 326 | Ingram Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 327 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 328 | Isaacs Fairy J | Konawa, OK 74849-0134 | Oil Operator | Sep 2020 |
| 329 | J & J Production Company LLC | Okemah, OK 74859 | Oil & Gas Operator | May 2025 |
| 330 | J & J Tank Truck Services LLC | Peyton, CO 80831 | Oil Operator | Oct 2024 |
| 331 | J Black Productions LLC | Seminole, OK 74868 | Oil Operator | May 2025 |
| 332 | J J B Oil & Gas Inc | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 1996 |
| 333 | J O MC Oil & Gas Inc | Maud, OK 74854 | Oil & Gas Operator | Apr 1999 |
| 334 | J&R Operating | Holliday, TX 76366 | Oil & Gas Operator | Feb 2024 |
| 335 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 336 | Jackson Oilfield Service Inc | Purcell, OK 73080-4357 | Oil & Gas Operator | Jan 2021 |
| 337 | Jagger Oil LLC | Konawa, OK 74849 | Oil & Gas Operator | Apr 2025 |
| 338 | James Petroleum Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2014 |
| 339 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 340 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | May 2025 |
| 341 | Jaquess W D "Bud" | Ada, OK 74820 | Oil & Gas Operator | Jan 2018 |
| 342 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 343 | JCTJ Energy LLC | Asher, OK 74826 | Oil & Gas Operator | May 2025 |
| 344 | Jeau Mar Limited Inc | Tulsa, OK 74114 | Oil & Gas Operator | Jul 1996 |
| 345 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 346 | Jenkins Charles L | Edmond, OK 73083-3610 | Oil Operator | Jul 1996 |
| 347 | Jenkins Energy Company | Comanche, OK 73529 | Oil Operator | Oct 2024 |
| 348 | Jerico Resources LLC | Seminole, OK 74868-6538 | Oil & Gas Operator | Apr 2020 |
| 349 | Jerry Scott Drilling Company Inc | Ada, OK 74821 | Oil & Gas Operator | Apr 2025 |
| 350 | Jesse Operating LLC | Konawa, OK 74849-4917 | Oil Operator | Apr 2025 |
| 351 | Jetson Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Sep 2024 |
| 352 | Jewell Consulting Inc | Bixby, OK 74008 | Oil & Gas Operator | Dec 2022 |
| 353 | Joe B Clifton Exploration Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | Apr 2022 |
| 354 | Johnson Bates Drilling Co Inc | Konawa, OK 74849 | Oil & Gas Operator | Aug 2002 |
| 355 | Johnson Doyle T | Oklahoma City, OK 73118-1007 | Oil & Gas Operator | Jan 2013 |
| 356 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 357 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 358 | Jordan Oil & Gas Company | Healdsburg, CA 95448-1919 | Oil & Gas Operator | Mar 1995 |
| 359 | Josie Oil & Gas Inc | Seminole, OK 74818-0134 | Oil & Gas Operator | Mar 2015 |
| 360 | Jvo Petroleum Inc | Shawnee, OK 74801 | Oil & Gas Operator | Jul 1995 |
| 361 | K Oil Company | Houston, TX 77005 | Oil & Gas Operator | Jul 2025 |
| 362 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | May 2025 |
| 363 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 364 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 365 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 366 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 367 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 368 | Katy Drilling Corporation | Tulsa, OK 74146-3717 | Oil & Gas Operator | Apr 2020 |
| 369 | Kay Production Company Inc | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 370 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Apr 2025 |
| 371 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | May 2025 |
| 372 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 373 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 374 | Kelley James C Estate | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 375 | Kelly Cook Oil LLC | Shawnee, OK 74804-3148 | Oil & Gas Operator | Apr 2025 |
| 376 | Kendol Exploration Inc | Oklahoma City, OK 73105-2513 | Oil & Gas Operator | Mar 2025 |
| 377 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 378 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 379 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 380 | Kimco Oil And Gas | Wewoka, OK 74884-0613 | Oil & Gas Operator | Jul 2016 |
| 381 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 382 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | May 2025 |
| 383 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 384 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 385 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 386 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 387 | Lahoma Production Inc | Jenks, OK 74037 | Oil & Gas Operator | Apr 2025 |
| 388 | Laird Anita Louise | Asher, OK 74826-3215 | Oil Operator | Jun 2018 |
| 389 | Laird Bill Oil Company | St Louis, OK 74866 | Oil & Gas Operator | Apr 2025 |
| 390 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | May 2025 |
| 391 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 392 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 393 | Landers Oil & Gas Inc | Tulsa, OK 74132-2171 | Oil & Gas Operator | Apr 2025 |
| 394 | Landmark Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 395 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 396 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 397 | Larkin Oil Co | Sasakwa, OK 74867 | Oil & Gas Operator | Aug 2015 |
| 398 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 399 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 400 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Apr 2025 |