| 401 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 402 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 403 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 404 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 405 | Otex LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |
| 406 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 407 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 408 | Palo Petroleum, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Feb 2026 |
| 409 | Pan Petroleum Corp. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 410 | Paragon Oil & Gas, LLC | Aledo, TX 76008 | Oil & Gas Operator | Feb 2026 |
| 411 | Pardue Oil | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2006 |
| 412 | Pardue Oil, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 413 | Parker Energy Company | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 414 | Parker Operating Co., Inc. | Aledo, TX 76008 | Oil & Gas Operator | Sep 2000 |
| 415 | Patterson Oil Company, The | Eastland, TX 76448 | Oil & Gas Operator | Nov 2025 |
| 416 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 417 | Patton, Lloyd | Fort Worth, TX 76113 | Oil & Gas Operator | Aug 2003 |
| 418 | Payne Petroleum | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 419 | Pearson, Lee Roy III | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 420 | Pearson, Lee Roy, Jr. | Eastland, TX 76448 | Oil & Gas Operator | Nov 1997 |
| 421 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 422 | Pergerson Energy, L.L.C. | Richmond, VA 23225 | Oil Operator | Feb 2026 |
| 423 | Permian Surveys | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 424 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 425 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 426 | Pitts, Charles Company | Abilene, TX 79604 | Oil & Gas Operator | Dec 1997 |
| 427 | PK Gath & Oilfield SVCS, Inc. | Cleburne, TX 76031 | Oil & Gas Operator | Feb 2026 |
| 428 | Place Oil And Gas Co. | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 429 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 430 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 431 | Plateau Energy, LLC | Smyer, TX 79367 | Oil & Gas Operator | Dec 2023 |
| 432 | Plover Production Company | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2006 |
| 433 | Poff, H. Bryan | Fort Worth, TX 76103 | Oil & Gas Operator | Mar 2008 |
| 434 | Prairie Production | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 435 | Prime Operating | Queen City, TX 75572 | Oil & Gas Operator | Apr 2005 |
| 436 | Probe Exploration Company | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 437 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Feb 2026 |
| 438 | Prospecta Energy Group, Inc. | Brownwood, TX 76801 | Oil Operator | Feb 2026 |
| 439 | Pruitt Engineering & Petro. Co. | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2007 |
| 440 | Putnam Oil Production | Abilene, TX 79603 | Oil & Gas Operator | Jun 2002 |
| 441 | PV Oil Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 442 | Quantum Investments | Lubbock, TX 79424 | Oil Operator | Feb 2026 |
| 443 | Quinlan Engineering | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 444 | R & B Energy Co. | Ranger, TX 76470 | Oil & Gas Operator | Mar 2008 |
| 445 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 446 | R R Operation Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2004 |
| 447 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 448 | Rainbow Seven Oil & Gas, Inc. | Ranger, TX 76470 | Oil & Gas Operator | Feb 2026 |
| 449 | Red Gap Oil & Gas LLC | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 450 | Regal Operating | Cisco, TX 76437 | Oil & Gas Operator | Mar 2008 |
| 451 | Regency Petroleum Co. | Irving, TX 75016 | Oil & Gas Operator | Aug 2002 |
| 452 | Regency Petroleum Co. Of New Mex | Coppell, TX 75019 | Oil & Gas Operator | Apr 2008 |
| 453 | Reh Oil And Gas, LLC. | Pratt, KS 67124 | Oil & Gas Operator | Apr 2019 |
| 454 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Feb 2026 |
| 455 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Feb 2026 |
| 456 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 457 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 458 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 459 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2026 |
| 460 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 461 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 462 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 463 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 464 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 465 | Ringo Rig LLC | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 466 | Rister Oil&Gas International LLC | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 467 | Rister, Dewey | Avoca, TX 79503 | Oil & Gas Operator | Feb 2026 |
| 468 | RJKB Foster Operating LLC | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 469 | Robertson, T. L. Operating Co. | Cross Plains, TX 76443 | Oil & Gas Operator | May 2004 |
| 470 | Robinson Oil & Gas, Inc. | Chico, TX 76431 | Oil & Gas Operator | Aug 2003 |
| 471 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 472 | Robinson, Irvin | Abilene, TX 79608 | Oil & Gas Operator | May 1999 |
| 473 | Rock Operating | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 474 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 475 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 476 | Rollo Resources, LLC | Granbury, TX 76049 | Gas Operator | Feb 2026 |
| 477 | Ronning Gas And Oil LLC | Mesa, AZ 85203 | Oil & Gas Operator | Feb 2026 |
| 478 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 479 | RSD Minerals LLC | Wichita, KS 67206 | Oil Operator | Aug 2025 |
| 480 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 481 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | Feb 2026 |
| 482 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 483 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Feb 2026 |
| 484 | Saffel, Wanda P. | Rule, TX 79547 | Oil & Gas Operator | Jun 2003 |
| 485 | Sams Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1998 |
| 486 | Saved By Grace Plugging, LLC | Tuscola, TX 79562 | Oil & Gas Operator | Dec 2018 |
| 487 | SBS Oil Company | Austin, TX 78749 | Oil & Gas Operator | Feb 2026 |
| 488 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 489 | Schkade Production Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2020 |
| 490 | Schkade, Carl E. | Albany, TX 76430 | Oil & Gas Operator | Sep 2009 |
| 491 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 492 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2003 |
| 493 | Scott | Cisco, TX 76437 | Oil & Gas Operator | Jul 2003 |
| 494 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 495 | Selous Energy, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2015 |
| 496 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 497 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 498 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 499 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 500 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |