| 501 | ABRAMS | San Juan County, NM | Oil & Gas Property | Sep 2018 |
| 502 | ABRAMS | Howard County, TX | Oil & Gas Property | Oct 2018 |
| 503 | ABRAMS | Howard County, TX | Oil & Gas Property | Oct 2018 |
| 504 | ABRAMS -A | Callahan County, TX | Oil & Gas Property | Sep 2018 |
| 505 | ABRAMS GAS COM | San Juan County, NM | Oil & Gas Property | Sep 2018 |
| 506 | ABRAMS GAS COM | San Juan County, NM | Oil & Gas Property | Mar 2017 |
| 507 | ABRAMS W. H | Brazoria County, TX | Oil & Gas Property | Oct 2018 |
| 508 | ABRAXAS | Martin County, TX | Oil & Gas Property | Oct 2018 |
| 509 | ABS 1 | Ness County, KS | Oil Property | Sep 2018 |
| 510 | ABSHIER | Liberty County, TX | Gas Property | Oct 2018 |
| 511 | ABSHIER 1 | Liberty County, TX | Gas Property | Oct 2018 |
| 512 | ABSHIER A. W. ETAL | Liberty County, TX | Oil & Gas Property | Oct 2018 |
| 513 | ABSHIER, MABEL | Ward County, TX | Oil & Gas Property | Sep 2018 |
| 514 | ABSHIRE | Pike County, KY | Gas Property | Dec 2013 |
| 515 | ABSHIRE WILLIAM | Johnson County, TX | Gas Property | Oct 2018 |
| 516 | ABSHIRE-SELECTED LANDS UNIT | Brazos County, TX | Gas Property | Oct 2018 |
| 517 | ABSTON | Tuscaloosa County, AL | Gas Property | Sep 2018 |
| 518 | ABSTON | Foard County, TX | Gas Property | Oct 2018 |
| 519 | ABSTON | Tuscaloosa County, AL | Gas Property | Sep 2018 |
| 520 | ABSTON UNIT #1 | Choctaw County, AL | Oil & Gas Property | Jul 2008 |
| 521 | ABUNDANCE AVZ | Eddy County, NM | Oil & Gas Property | Oct 2018 |
| 522 | AC MCLAUGHLIN | Rio Blanco County, CO | Oil & Gas Property | Oct 2018 |
| 523 | AC RANCH | Sheridan County, WY | Gas Property | Jun 2015 |
| 524 | AC RANCH | Sheridan County, WY | Gas Property | Jun 2015 |
| 525 | AC-8 BROWN ALTMAN | Winkler County, TX | Oil & Gas Property | Oct 2018 |
| 526 | AC360 | Tarrant County, TX | Gas Property | Oct 2018 |
| 527 | ACAA | Allegheny County, PA | Gas Property | Oct 2018 |
| 528 | ACACIA COUNTRY CLUB | Cuyahoga County, OH | Oil & Gas Property | Dec 2017 |
| 529 | ACACIA CS FED | Campbell County, WY | Gas Property | Aug 2018 |
| 530 | ACADIA | Gonzales County, TX | Oil & Gas Property | Oct 2018 |
| 531 | ACADIA 31-25H | McKenzie County, ND | Oil & Gas Property | Nov 2018 |
| 532 | ACADIA B | Acadia Parish, LA | Oil Property | Jul 2018 |
| 533 | ACCAWINNA 13-22-15-3-2W-MW | Duchesne County, UT | Oil & Gas Property | Oct 2018 |
| 534 | ACCETTOLO, PATRICIA & LOUIS | Marshall County, WV | Oil & Gas Property | Dec 2017 |
| 535 | ACCIPITER | Scurry County, TX | Oil & Gas Property | Aug 2017 |
| 536 | ACE 1-14 | Ness County, KS | Oil Property | Sep 2018 |
| 537 | ACE 118 | Ochiltree County, TX | Oil & Gas Property | Oct 2018 |
| 538 | ACE E CDZ HR 8H | Harrison County, OH | Oil & Gas Property | Sep 2018 |
| 539 | ACE L06H | Reeves County, TX | Gas Property | Sep 2018 |
| 540 | ACE UNIT | Denton County, TX | Gas Property | Oct 2018 |
| 541 | ACE UNIT | Moffat County, CO | Oil & Gas Property | Oct 2018 |
| 542 | ACE W CDZ HR | Harrison County, OH | Oil & Gas Property | Sep 2018 |
| 543 | ACEE PURE MILK CO | Logan County, AR | Gas Property | Oct 2018 |
| 544 | ACELA | Zapata County, TX | Gas Property | Oct 2018 |
| 545 | ACERNI | Armstrong County, PA | Oil & Gas Property | Dec 2017 |
| 546 | ACERNI | Armstrong County, PA | Gas Property | Dec 2017 |
| 547 | ACEVEDO | Starr County, TX | Gas Property | Mar 2018 |
| 548 | ACEVEDO-HAERING | Webb County, TX | Gas Property | Oct 2018 |
| 549 | ACHATZ | Barton County, KS | Oil Property | Sep 2018 |
| 550 | ACHEN FREY DM | Eddy County, NM | Oil & Gas Property | Dec 2016 |
| 551 | ACHENBACH | Barber County, KS | Oil & Gas Property | Sep 2018 |
| 552 | ACHENBACH | Barber County, KS | Oil & Gas Property | Sep 2018 |
| 553 | ACHENBACH | Barber County, KS | Oil & Gas Property | Sep 2018 |
| 554 | ACHERON | Shelby County, TX | Oil & Gas Property | Oct 2018 |
| 555 | ACHESON | Graham County, KS | Oil Property | Sep 2018 |
| 556 | ACHILLES 1-22H | Lincoln County, OK | Gas Property | Nov 2018 |
| 557 | ACHTERBERG ANTON | Guadalupe County, TX | Oil & Gas Property | Sep 2018 |
| 558 | ACHZIGER | Weld County, CO | Oil & Gas Property | Oct 2018 |
| 559 | ACIN ALLEN&PRYOR | Boone County, WV | Gas Property | Sep 2017 |
| 560 | ACIN LL | Kanawha County, WV | Oil & Gas Property | Dec 2017 |
| 561 | ACIN LLC | Letcher County, KY | Oil & Gas Property | Dec 2015 |
| 562 | ACIN LLC ALLEN&PRYOR | Boone County, WV | Oil & Gas Property | Sep 2017 |
| 563 | ACIN, LLC 16 | Letcher County, KY | Gas Property | Dec 2015 |
| 564 | ACKER | Pittsburg County, OK | Gas Property | Nov 2018 |
| 565 | ACKER | Fayette County, TX | Oil & Gas Property | Oct 2018 |
| 566 | ACKER | McMullen County, TX | Oil & Gas Property | Oct 2018 |
| 567 | ACKER | Rusk County, TX | Gas Property | Oct 2018 |
| 568 | ACKER | Manistee County, MI | Oil & Gas Property | May 2018 |
| 569 | ACKER | Campbell County, WY | Gas Property | Apr 2016 |
| 570 | ACKER | Hocking County, OH | Oil Property | Dec 2017 |
| 571 | ACKER | Wayne County, OH | Oil & Gas Property | Dec 2017 |
| 572 | ACKER #12 | Tuscaloosa County, AL | Gas Property | Sep 2018 |
| 573 | ACKER C | Susquehanna County, PA | Gas Property | Oct 2018 |
| 574 | ACKER UNIT NO | McMullen County, TX | Gas Property | Oct 2018 |
| 575 | ACKERLY | Martin County, TX | Oil & Gas Property | Oct 2018 |
| 576 | ACKERLY DAVENPORT 11 | Dawson County, TX | Oil & Gas Property | Oct 2018 |
| 577 | ACKERLY DAVENPORT 16A | Martin County, TX | Oil & Gas Property | Oct 2018 |
| 578 | ACKERLY LANGHAM 24 | Martin County, TX | Oil & Gas Property | Oct 2018 |
| 579 | ACKERLY/DEAN/FIELDUNIT | Dawson County, TX | Oil & Gas Property | Oct 2018 |
| 580 | ACKERMAN | Allegany County, NY | Oil & Gas Property | Dec 2017 |
| 581 | ACKERMAN | Stafford County, KS | Gas Property | Sep 2018 |
| 582 | ACKERMAN | Monroe County, OH | Oil & Gas Property | Dec 2017 |
| 583 | ACKERMAN | Gray County, TX | Gas Property | Oct 2018 |
| 584 | ACKERMAN | Grant County, KS | Gas Property | Sep 2018 |
| 585 | ACKERMAN | Weston County, WY | Oil & Gas Property | Nov 2018 |
| 586 | ACKERS | Stephens County, TX | Oil & Gas Property | Oct 2018 |
| 587 | ACKERS | Shackelford County, TX | Oil & Gas Property | Oct 2018 |
| 588 | ACKERS 80 | Callahan County, TX | Oil & Gas Property | Oct 2018 |
| 589 | ACKERS MORRIS SAND UNIT | Shackelford County, TX | Oil & Gas Property | Oct 2018 |
| 590 | ACKERS RANCH 26 TANNEHILL SD. U | Shackelford County, TX | Oil & Gas Property | Oct 2018 |
| 591 | ACKERS-STATE (CADDO) UNIT | Stephens County, TX | Oil & Gas Property | May 2000 |
| 592 | ACKLEY | Cattaraugus County, NY | Gas Property | Dec 2017 |
| 593 | ACKLINS 6092 12-18H | Burke County, ND | Oil & Gas Property | Nov 2018 |
| 594 | ACLA | Bradford County, PA | Gas Property | Oct 2018 |
| 595 | ACLCO HAY G.U. 2 1H | Angelina County, TX | Gas Property | Oct 2018 |
| 596 | ACLCO UNIT | Nacogdoches County, TX | Gas Property | Oct 2018 |
| 597 | ACLETO CREEK WATERFLOOD UNIT | Wilson County, TX | Oil & Gas Property | Oct 2018 |
| 598 | ACME | Los Angeles County, CA | Oil & Gas Property | Dec 2017 |
| 599 | ACME | Kern County, CA | Oil Property | Feb 2018 |
| 600 | ACME | Chaves County, NM | Gas Property | Oct 2018 |