| 301 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Feb 2026 |
| 302 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 303 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 304 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 305 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 306 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Feb 2026 |
| 307 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 308 | Silverridge Corp | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2015 |
| 309 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 310 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2026 |
| 311 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jun 2026 |
| 312 | Smith Shirley C | Claremore, OK 74017-0060 | Oil & Gas Operator | Mar 2015 |
| 313 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 314 | Sockey Mike | Poteau, OK 74953 | Gas Operator | Feb 2026 |
| 315 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 316 | Southern Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2026 |
| 317 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 318 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 319 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 320 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 321 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 322 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 323 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2026 |
| 324 | Stover Company | Tulsa, OK 74152-0786 | Oil & Gas Operator | Jan 2013 |
| 325 | Striker Management Co LLC | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2026 |
| 326 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 327 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2026 |
| 328 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Mar 2026 |
| 329 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Jun 2026 |
| 330 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Feb 2026 |
| 331 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 332 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 333 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 334 | Texinia Limited Partnership | Dallas, TX 75201 | Gas Operator | Jan 2017 |
| 335 | Texinia Oil & Gas Inc | Dallas, TX 75214 | Oil & Gas Operator | Mar 2026 |
| 336 | Texocan Minerals Inc | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2000 |
| 337 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2026 |
| 338 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 339 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 340 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 341 | Triumph Resources Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2004 |
| 342 | Tucker Ron & Co | Norman, OK 73069-8511 | Gas Operator | Sep 2017 |
| 343 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 344 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 345 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 346 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 347 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 348 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Feb 2026 |
| 349 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jun 2026 |
| 350 | Universal Drilling Company | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 |
| 351 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Feb 2026 |
| 352 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 353 | W F D Oil Corp. | Edmond, OK 73012 | Oil & Gas Operator | Feb 2026 |
| 354 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 355 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 356 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Mar 2026 |
| 357 | Westphal Oil & Gas Inc | Fort Smith, AR 72901-2199 | Oil & Gas Operator | Feb 2015 |
| 358 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 359 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2026 |
| 360 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 361 | Whitmar Natural Resources Co | Tulsa, OK 74136-9998 | Oil & Gas Operator | Jun 2004 |
| 362 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 363 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2026 |
| 364 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 365 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2026 |
| 366 | Wohlford Properties Inc | Barling, AR 72923 | Gas Operator | Apr 2022 |
| 367 | Wolf Howard Lee | Burneyville, OK 73430-9617 | Oil & Gas Operator | Jun 2000 |
| 368 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 369 | Wood Oil Company | Tulsa, OK 74103 | Gas Operator | Oct 1997 |
| 370 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 371 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 372 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Feb 2026 |
| 373 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 374 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 375 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 376 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 377 | Zeiders Bros. Oil & Gas Company, L.L.C. | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 378 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 379 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Feb 2026 |