| 301 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 302 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 303 | Sebep LLC | Houston, TX 77224-9545 | Gas Operator | Oct 2024 |
| 304 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Oct 2024 |
| 305 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 306 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 307 | Sequent Exploration Inc | | Oil & Gas Operator | Oct 2017 |
| 308 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Oct 2024 |
| 309 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Sep 2024 |
| 310 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 311 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Sep 2024 |
| 312 | Silverridge Corp | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2015 |
| 313 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 314 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2024 |
| 315 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 316 | Smith W M | Barnstall, OK 74002 | Oil & Gas Operator | Sep 2024 |
| 317 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Oct 2024 |
| 318 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 319 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 320 | Southwest Energy LP | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 321 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 322 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Oct 2024 |
| 323 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 324 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 325 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 326 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 327 | Sunnybook Transmission Inc | Houston, TX 77002 | Oil & Gas Operator | Oct 1992 |
| 328 | Sunwest Oklahoma, Inc | Dallas, TX 75231 | Oil & Gas Operator | May 2023 |
| 329 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 330 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Oct 2024 |
| 331 | Tenaska Marketing Ventures | Omaha, NE 68154 | Oil & Gas Operator | Mar 2021 |
| 332 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Aug 2024 |
| 333 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 334 | Texaco Oils, Inc. | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 335 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 336 | Texinia Limited Partnership | Dallas, TX 75201 | Gas Operator | Jan 2017 |
| 337 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 338 | Tiger Trucks Inc | Seminole, OK 74868 | Oil & Gas Operator | Oct 2024 |
| 339 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Oct 2024 |
| 340 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2024 |
| 341 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 342 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 343 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2024 |
| 344 | Tucker Ron & Co | Norman, OK 73069-8511 | Gas Operator | Sep 2017 |
| 345 | Twenty First Century Res Inc | Lajolla, CA 92037-7044 | Oil & Gas Operator | Mar 2015 |
| 346 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 347 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 348 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 349 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 350 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Sep 2024 |
| 351 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 352 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Aug 2024 |
| 353 | Vectra CBM LLC | Littleton, CO 80128-4557 | Gas Operator | Jan 2014 |
| 354 | Vintage Gas Inc | Tulsa, OK 74119-1029 | Oil & Gas Operator | Jun 2007 |
| 355 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2024 |
| 356 | Vitruvian Exploration LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2016 |
| 357 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 358 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2024 |
| 359 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Sep 2024 |
| 360 | Wente Exploration Inc | Oklahoma City, OK 73102 | Gas Operator | Oct 2011 |
| 361 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Oct 2024 |
| 362 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 2024 |
| 363 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2024 |
| 364 | White Wolf Energy LLC | Richardson, TX 75080-5509 | Oil & Gas Operator | Oct 2022 |
| 365 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 366 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 367 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2024 |
| 368 | Williford Resources LLC | Tulsa, OK 74136-1020 | Oil & Gas Operator | Sep 2024 |
| 369 | Wohlford Properties Inc | Barling, AR 72923 | Gas Operator | Apr 2022 |
| 370 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 371 | Wright V Gerald | Cushing, OK 74023 | Oil & Gas Operator | Nov 2003 |
| 372 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Jan 2020 |
| 373 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 374 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Oct 2024 |
| 375 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 376 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 377 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |