| 501 | OTT C.E. ET AL | Galveston County, TX | Oil & Gas Property | Feb 2015 |
| 502 | OTTER 139-138 UNIT | Reeves County, TX | Oil & Gas Property | Dec 2025 |
| 503 | OTTERHOUND HCX | Burleson County, TX | Oil & Gas Property | Jan 2026 |
| 504 | OTTO | Cooke County, TX | Oil & Gas Property | Jan 2026 |
| 505 | OTTO | Grayson County, TX | Oil & Gas Property | Jan 2026 |
| 506 | OTTO | Gonzales County, TX | Oil & Gas Property | Dec 2025 |
| 507 | OTTO | Cooke County, TX | Oil & Gas Property | Jan 2026 |
| 508 | OTTO 1H | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 509 | OTTO GAS UNIT NO. 1 | Kleberg County, TX | Oil & Gas Property | Dec 2023 |
| 510 | OTTO MAX | Atascosa County, TX | Oil & Gas Property | Oct 2015 |
| 511 | OTTO UNIT | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 512 | OTTO UNIT 1H | McMullen County, TX | Gas Property | Jan 2026 |
| 513 | OTTO-WHIPPLE | McMullen County, TX | Oil & Gas Property | Jan 2026 |
| 514 | OUIDA WILSON 45 | Roberts County, TX | Oil & Gas Property | Jan 2026 |
| 515 | OURAY STATE | Reeves County, TX | Oil & Gas Property | Jan 2026 |
| 516 | OUT OF YOUR ELEMENT | Wilson County, TX | Oil & Gas Property | Jan 2026 |
| 517 | OUTLAW 55-1-30 UNIT 1H | Loving County, TX | Oil & Gas Property | Jan 2026 |
| 518 | OUTTERSIDE A. J | Galveston County, TX | Oil & Gas Property | Jan 2026 |
| 519 | OV UNIT | Dawson County, TX | Oil & Gas Property | Jan 2026 |
| 520 | OVERALL | Coleman County, TX | Oil & Gas Property | Jan 2026 |
| 521 | OVERBEY | Wichita County, TX | Oil & Gas Property | Dec 2025 |
| 522 | OVERBY | Wichita County, TX | Oil & Gas Property | Jan 2026 |
| 523 | OVERBY C. J | Karnes County, TX | Oil & Gas Property | Apr 2015 |
| 524 | OVERBY GAS UNIT 2E | Bee County, TX | Oil & Gas Property | Jan 2026 |
| 525 | OVERCASH | Throckmorton County, TX | Oil & Gas Property | Dec 2025 |
| 526 | OVERLORD 21-56 | Midland County, TX | Oil & Gas Property | Jan 2026 |
| 527 | OVERSHOWN GAS UNIT | Houston County, TX | Oil & Gas Property | Jan 2026 |
| 528 | OVERSTREET | Cooke County, TX | Oil Property | Jan 2026 |
| 529 | OVERSTREET | Polk County, TX | Oil & Gas Property | Apr 2025 |
| 530 | OVERTON | Smith County, TX | Oil & Gas Property | Jan 2026 |
| 531 | OVERTON | Dawson County, TX | Oil & Gas Property | Jan 2026 |
| 532 | OVERTON | Glasscock County, TX | Oil & Gas Property | Jan 2026 |
| 533 | OVERTON BEN | Brown County, TX | Oil & Gas Property | Dec 2025 |
| 534 | OVERTON G | Rusk County, TX | Oil & Gas Property | Jan 2026 |
| 535 | OVERTON NE (PETTIT -A-) UNIT | Rusk County, TX | Oil & Gas Property | Jan 2026 |
| 536 | OVMLC | Dawson County, TX | Oil & Gas Property | Jan 2026 |
| 537 | OWEN | Moore County, TX | Oil & Gas Property | Jan 2026 |
| 538 | OWEN | Johnson County, TX | Oil & Gas Property | Jan 2026 |
| 539 | OWEN | Burleson County, TX | Oil & Gas Property | Jan 2026 |
| 540 | OWEN | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 541 | OWEN | Jack County, TX | Oil & Gas Property | Apr 2025 |
| 542 | OWEN | Ector County, TX | Oil & Gas Property | Jan 2026 |
| 543 | OWEN | Jack County, TX | Oil & Gas Property | Jan 2026 |
| 544 | OWEN | Young County, TX | Oil & Gas Property | Jan 2026 |
| 545 | OWEN | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 546 | OWEN F | Burleson County, TX | Oil & Gas Property | May 2022 |
| 547 | OWEN GMB | Harrison County, TX | Gas Property | Jan 2026 |
| 548 | OWEN J | Ellis County, TX | Oil & Gas Property | Dec 2025 |
| 549 | OWEN J.D. GAS UNIT | Bowie County, TX | Oil & Gas Property | Feb 2018 |
| 550 | OWEN RHB 1H | Harrison County, TX | Gas Property | Jan 2026 |
| 551 | OWEN-BERRY | Cooke County, TX | Oil Property | Jan 2026 |
| 552 | OWEN-BRISCOE | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 553 | OWEN-BRISCOE STATE-WCSL GU B 2H | Webb County, TX | Gas Property | Jan 2026 |
| 554 | OWEN-CHALK | Howard County, TX | Oil & Gas Property | Jan 2026 |
| 555 | OWEN-STATE 1 | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 556 | OWENS | Jack County, TX | Oil & Gas Property | Sep 2021 |
| 557 | OWENS | Colorado County, TX | Oil & Gas Property | Oct 2025 |
| 558 | OWENS | Cass County, TX | Oil & Gas Property | Jan 2026 |
| 559 | OWENS | Johnson County, TX | Oil & Gas Property | Jan 2026 |
| 560 | OWENS | Lee County, TX | Oil & Gas Property | Jan 2026 |
| 561 | OWENS | Crockett County, TX | Oil & Gas Property | Jan 2026 |
| 562 | OWENS | Upton County, TX | Oil & Gas Property | Jan 2026 |
| 563 | OWENS | Panola County, TX | Oil & Gas Property | Jan 2026 |
| 564 | OWENS | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 565 | OWENS | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 566 | OWENS | Ochiltree County, TX | Oil & Gas Property | Jan 2026 |
| 567 | OWENS | Upton County, TX | Oil & Gas Property | Jan 2026 |
| 568 | OWENS | Panola County, TX | Oil & Gas Property | Jan 2026 |
| 569 | OWENS | Reagan County, TX | Oil & Gas Property | Jan 2026 |
| 570 | OWENS | Wilbarger County, TX | Oil & Gas Property | Jan 2026 |
| 571 | OWENS | Shackelford County, TX | Oil & Gas Property | Dec 2025 |
| 572 | OWENS & SNOOT | Crane County, TX | Oil Property | Jan 2020 |
| 573 | OWENS 1-75 LOV | Loving County, TX | Oil & Gas Property | Jan 2026 |
| 574 | OWENS C | Freestone County, TX | Oil & Gas Property | Jan 2026 |
| 575 | OWENS E. ARLEIGH | Webb County, TX | Oil & Gas Property | Jan 2026 |
| 576 | OWENS FELMONT | Upton County, TX | Oil & Gas Property | Jul 2022 |
| 577 | OWENS GAS UNIT | Freestone County, TX | Oil & Gas Property | Jan 2026 |
| 578 | OWENS M. J | Wichita County, TX | Oil & Gas Property | Jan 2026 |
| 579 | OWENS MACK | Jones County, TX | Oil & Gas Property | Feb 2016 |
| 580 | OWENS NELLIE | Panola County, TX | Oil & Gas Property | Jan 2026 |
| 581 | OWENS T.B. GAS UNIT | Harrison County, TX | Oil & Gas Property | Jan 2026 |
| 582 | OWENS UNIT | Denton County, TX | Oil & Gas Property | Jan 2026 |
| 583 | OWENS UNIT A | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 584 | OWENS-CRAVENS | Upton County, TX | Oil & Gas Property | Jan 2026 |
| 585 | OWENS-TAYLOR 31 | Upton County, TX | Oil & Gas Property | Jan 2026 |
| 586 | OWL A | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 587 | OWL B | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 588 | OWL C | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 589 | OWL D | Gonzales County, TX | Oil & Gas Property | Jan 2026 |
| 590 | OWL DRAW | Culberson County, TX | Oil & Gas Property | Feb 2026 |
| 591 | OWNBEY | Hutchinson County, TX | Oil & Gas Property | Jan 2026 |
| 592 | OWNBY | Yoakum County, TX | Oil & Gas Property | Jul 1994 |
| 593 | OWNBY SAN ANDRE | Yoakum County, TX | Oil & Gas Property | Jan 2026 |
| 594 | OWNBY/CLEARFORK, UPPER/ | Yoakum County, TX | Oil & Gas Property | Dec 2025 |
| 595 | OXER UNIT | Parker County, TX | Oil & Gas Property | Jan 2026 |
| 596 | OXFORD UNIT | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 597 | OXFORD WITTE-CREEL MIXON SA | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 598 | OXFORD-WITTE UNIT | Karnes County, TX | Oil & Gas Property | Jan 2026 |
| 599 | OXLEY ET AL UNIT | Chambers County, TX | Oil & Gas Property | Jan 2026 |
| 600 | OXSHEER | Panola County, TX | Oil & Gas Property | Dec 2025 |