| 501 | SAKO UNIT A LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 502 | SALINAS UNIT I | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 503 | SCHLETZE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 504 | SCHLETZE | La Salle County, TX | Oil & Gas Property | Apr 2015 |
| 505 | SCHOOLFIELD | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 506 | SCHORP | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 507 | SCHORP-WHITE RANCH LTD | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 508 | SCHUBERT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 509 | SCHUBERT CRAFT UNIT | La Salle County, TX | Oil & Gas Property | Nov 2025 |
| 510 | SCHUBERT UNIT 1H | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 511 | SCHUBERT-GOLLA-MARTIN PSA | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 512 | SCHULZE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 513 | SCHULZE TALBUTT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 514 | SCHULZE-SCOTT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 515 | SCHWOPE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 516 | SCHWOPE NORTH LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 517 | SCHWOPE SOUTH LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 518 | SCOTT-WILKINSON | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 519 | SEAL LEHMAN | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 520 | SEAL-SOTO ALLOCATION | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 521 | SHAW-KLATTENHOFF | La Salle County, TX | Oil & Gas Property | May 2022 |
| 522 | SHENKIR | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 523 | SHINER | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 524 | SHINING STAR RANCH | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 525 | SHOFNER UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 526 | SHORT | La Salle County, TX | Oil & Gas Property | Apr 2025 |
| 527 | SILVERBRITE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 528 | SJM UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 529 | SKIPJACK | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 530 | SLYTHERIN | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 531 | SMART UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 532 | SMITH A UNIT A | La Salle County, TX | Oil & Gas Property | Dec 2016 |
| 533 | SMITH B UNIT B | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 534 | SMITH JOEY | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 535 | SNJ STEAMBOAT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 536 | SNOW UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 537 | SNOWBIRD | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 538 | SNOWDEN | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 539 | SO. TEX. SYNDICATE LEASE | La Salle County, TX | Oil & Gas Property | Nov 2019 |
| 540 | SO. TEXAS SYNDICATE #39 | La Salle County, TX | Oil & Gas Property | Apr 2025 |
| 541 | SOCKEYE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 542 | SOCKEYE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 543 | SOIXANTE QUINZE | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 544 | SOLITUDE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 545 | SOUTH TEXAS S | La Salle County, TX | Oil & Gas Property | Sep 2013 |
| 546 | SPRINGER | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 547 | SPRINGER - SSS O UNIT 1H | La Salle County, TX | Gas Property | Jan 2026 |
| 548 | ST. LOUIS UNION TRUST CO | La Salle County, TX | Oil & Gas Property | Aug 2009 |
| 549 | STAR FIRE RANCH | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 550 | STEELHEAD | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 551 | STEPHENSON | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 552 | STOCKTON | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 553 | STOREY | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 554 | STOREY | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 555 | STOREY-PEEBLES UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 556 | STS 1 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 557 | STS 1 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 558 | STS 2 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 559 | STS 2 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 560 | STS 3 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 561 | STS 4 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 562 | STS 5 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 563 | STS 6 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 564 | STS 7 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 565 | STS A | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 566 | STS A - NMC UNIT 1 17H | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 567 | STS A 2 | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 568 | STS A STATE UNIT 20H | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 569 | STS B | La Salle County, TX | Oil & Gas Property | Aug 2019 |
| 570 | STS B | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 571 | STS F-BPX B (SA) F | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 572 | SUMBERA | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 573 | SUZANNE UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 574 | T KIRK UNIT B LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 575 | TAHOE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 576 | TALBUTT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 577 | TALBUTT NORTH RME | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 578 | TALBUTT WEST RME | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 579 | TALISMAN ENERGY USA INC. 1 | La Salle County, TX | Oil & Gas Property | Feb 2012 |
| 580 | TEAK | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 581 | TELLURIDE | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 582 | THIEL MARTIN | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 583 | THORNTON | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 584 | THURMAN | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 585 | THURMAN NORTH LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 586 | TILLY | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 587 | TOM HANKS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 588 | TOWNSEND | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 589 | TREVINO UNIT I LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 590 | TRIBAR D. W. 56 C | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 591 | TRIBAR-SCHOOLFIELD | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 592 | TRIGO UNIT A LAS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 593 | TRIPLE BAR | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 594 | TT RANCH UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 595 | TURMAN | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 596 | VAIL | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 597 | VAN CLEVE UNIT | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 598 | VENADO | La Salle County, TX | Oil & Gas Property | Dec 2025 |
| 599 | VENADO BROS | La Salle County, TX | Oil & Gas Property | Jan 2026 |
| 600 | VESPER DIM | La Salle County, TX | Oil & Gas Property | Jan 2026 |