| 401 | ORGAIN | Liberty County, TX | Oil & Gas Property | Jan 2026 |
| 402 | ORGAIN B. D | Hardin County, TX | Oil & Gas Property | Sep 2025 |
| 403 | ORGAIN HEIRS | Bastrop County, TX | Oil & Gas Property | Dec 2025 |
| 404 | ORGANIC | Midland County, TX | Oil & Gas Property | Jan 2026 |
| 405 | ORIENT 1-12 | Howard County, TX | Oil & Gas Property | Jan 2026 |
| 406 | ORIN FORTENBERRY GAS UNIT | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 407 | ORINGDERFF | Ochiltree County, TX | Oil & Gas Property | Jan 2026 |
| 408 | ORINGDERFF EATON | Ochiltree County, TX | Oil & Gas Property | Jan 2026 |
| 409 | ORION | Atascosa County, TX | Oil & Gas Property | Jan 2026 |
| 410 | ORION | Loving County, TX | Oil & Gas Property | Jan 2026 |
| 411 | ORION UNIT | Shelby County, TX | Gas Property | Jan 2026 |
| 412 | ORIVE A | Starr County, TX | Oil & Gas Property | Jan 2026 |
| 413 | ORLA | Reeves County, TX | Oil & Gas Property | Mar 2021 |
| 414 | ORME CHARLSIE | Palo Pinto County, TX | Oil & Gas Property | Jan 2026 |
| 415 | ORMS | Gregg County, TX | Oil & Gas Property | Jan 2026 |
| 416 | ORMSBY | Johnson County, TX | Oil & Gas Property | Jan 2026 |
| 417 | ORO NEGRO UNIT | Dewitt County, TX | Oil & Gas Property | Jan 2026 |
| 418 | ORPHEUM | Reeves County, TX | Oil & Gas Property | Jan 2026 |
| 419 | ORR A | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 420 | ORR B | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 421 | ORR C | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 422 | ORR D | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 423 | ORR J. B | Upshur County, TX | Oil & Gas Property | Dec 2021 |
| 424 | ORR RANCH UNIT | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 425 | ORR ROBERT | Milam County, TX | Oil & Gas Property | Jan 2026 |
| 426 | ORR UNIT | Marion County, TX | Oil & Gas Property | Jan 2026 |
| 427 | ORR UNIT | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 428 | ORR UNIT | Ellis County, TX | Gas Property | Jan 2026 |
| 429 | ORR WILLIAM | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 430 | ORR WM | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 431 | ORR WM. -A- UNIT 2C | Wise County, TX | Gas Property | Jan 2026 |
| 432 | ORR-BURKS GU | Rusk County, TX | Oil & Gas Property | Jan 2026 |
| 433 | ORR-TIPPS | Rusk County, TX | Oil & Gas Property | Jan 2026 |
| 434 | ORSBORN | King County, TX | Oil & Gas Property | Feb 2025 |
| 435 | ORSON | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 436 | ORSON | Andrews County, TX | Oil & Gas Property | Jan 2026 |
| 437 | ORSON-BILLY 139 | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 438 | ORTEGA | Reagan County, TX | Oil & Gas Property | Jan 2026 |
| 439 | ORTHA JONES 41 | Ochiltree County, TX | Oil & Gas Property | Jan 2026 |
| 440 | ORTHRUS UNIT | Borden County, TX | Oil & Gas Property | Jan 2026 |
| 441 | ORTIZ RANCH | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 442 | ORTMANN | Wilson County, TX | Oil & Gas Property | Jan 2026 |
| 443 | ORTON | Clay County, TX | Oil & Gas Property | Jan 2026 |
| 444 | ORTON A | Archer County, TX | Oil & Gas Property | Jan 2026 |
| 445 | ORTON UNIT | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 446 | ORTS H.P | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 447 | ORVIS 37 | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 448 | ORYX | Atascosa County, TX | Oil & Gas Property | Jan 2026 |
| 449 | ORYX 13 | Reeves County, TX | Oil & Gas Property | Jan 2026 |
| 450 | ORYX 53-2-12 | Loving County, TX | Oil & Gas Property | Jan 2026 |
| 451 | ORYX FEE | Hardin County, TX | Oil Property | Jan 2026 |
| 452 | ORYX HUNTER | Lavaca County, TX | Oil & Gas Property | Jan 2026 |
| 453 | ORYX ROAN STATE | Reeves County, TX | Oil & Gas Property | Jan 2026 |
| 454 | ORYX-AKIN | Gregg County, TX | Oil & Gas Property | Jan 2026 |
| 455 | ORYX-SUN FEE | Chambers County, TX | Oil & Gas Property | Aug 2024 |
| 456 | OSAGE UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 457 | OSBORN | Freestone County, TX | Oil & Gas Property | Jan 2026 |
| 458 | OSBORNE | Ochiltree County, TX | Oil & Gas Property | Aug 2024 |
| 459 | OSBORNE | Roberts County, TX | Oil & Gas Property | Jan 2026 |
| 460 | OSBORNE | Panola County, TX | Oil & Gas Property | Nov 2025 |
| 461 | OSBORNE | Eastland County, TX | Oil & Gas Property | Oct 2025 |
| 462 | OSBORNE | Tyler County, TX | Oil & Gas Property | Jan 2026 |
| 463 | OSBORNE | Madison County, TX | Oil & Gas Property | Jan 2026 |
| 464 | OSBORNE | Sherman County, TX | Oil & Gas Property | Jan 2026 |
| 465 | OSBORNE | Carson County, TX | Gas Property | Jan 2026 |
| 466 | OSBORNE | Gray County, TX | Gas Property | Dec 2024 |
| 467 | OSBORNE | Gray County, TX | Oil & Gas Property | Jan 2026 |
| 468 | OSBORNE HEIRS | Harrison County, TX | Oil & Gas Property | Oct 2025 |
| 469 | OSBURN | Johnson County, TX | Oil & Gas Property | Jan 2026 |
| 470 | OSBURN | Concho County, TX | Oil Property | Jul 2021 |
| 471 | OSBURN WENDELL | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 472 | OSCAR | Scurry County, TX | Oil & Gas Property | Jan 2026 |
| 473 | OSCEOLA MCELROY HEIRS (AW) | Harrison County, TX | Oil & Gas Property | Jan 2026 |
| 474 | OSCEOLA-ELDRIDGE BIVINS (AW) 1H | Harrison County, TX | Oil & Gas Property | Jan 2026 |
| 475 | OSIKA | Jack County, TX | Oil & Gas Property | Jun 2013 |
| 476 | OSINA | Fayette County, TX | Oil & Gas Property | Jan 2026 |
| 477 | OSIRIS 7-1-62 | Mitchell County, TX | Oil & Gas Property | Jan 2026 |
| 478 | OSLER | Tarrant County, TX | Gas Property | Jan 2026 |
| 479 | OSO 1H | Winkler County, TX | Oil & Gas Property | Jan 2026 |
| 480 | OSPREY | Jim Hogg County, TX | Oil & Gas Property | Nov 2023 |
| 481 | OSPREY | Tarrant County, TX | Gas Property | Jan 2026 |
| 482 | OSPREY STATE UNIT | Loving County, TX | Oil & Gas Property | Jan 2026 |
| 483 | OSPREY STATE WEST UNIT | Pecos County, TX | Oil & Gas Property | Jan 2026 |
| 484 | OSPREY UNIT | Atascosa County, TX | Oil & Gas Property | Jan 2026 |
| 485 | OSR-HALLIDAY | Madison County, TX | Oil & Gas Property | Dec 2025 |
| 486 | OSR/KIRBY | Reagan County, TX | Oil & Gas Property | Aug 2025 |
| 487 | OSTEEN W. N | Caldwell County, TX | Oil & Gas Property | Dec 2025 |
| 488 | OSTRANDER | Irion County, TX | Oil & Gas Property | Jan 2026 |
| 489 | OSTRICH UNIT | Atascosa County, TX | Oil & Gas Property | Jan 2026 |
| 490 | OTB BLAGRAVE 1 | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 491 | OTB JOHNSON F | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 492 | OTB OBRIEN 43 | Martin County, TX | Oil & Gas Property | Jan 2026 |
| 493 | OTEN WILL | Rusk County, TX | Oil & Gas Property | Jan 2026 |
| 494 | OTHER JEFFREY LEBOWSKI | Wilson County, TX | Oil & Gas Property | Jan 2026 |
| 495 | OTHOLD-MARTINSEN (SA) UNIT | Lavaca County, TX | Oil & Gas Property | Jan 2026 |
| 496 | OTIS | Ector County, TX | Oil & Gas Property | Apr 2012 |
| 497 | OTIS | Palo Pinto County, TX | Oil & Gas Property | Jan 2026 |
| 498 | OTIS | Howard County, TX | Oil & Gas Property | Jan 2026 |
| 499 | OTIS PHILLIPS | Moore County, TX | Oil & Gas Property | Jan 2026 |
| 500 | OTRA BACA | Johnson County, TX | Gas Property | Aug 2024 |