| 501 | ABUNDANCE AVZ | Eddy County, NM | Oil & Gas Property | Oct 2018 |
| 502 | AC MCLAUGHLIN | Rio Blanco County, CO | Oil & Gas Property | Jan 2019 |
| 503 | AC RANCH | Sheridan County, WY | Gas Property | Jun 2015 |
| 504 | AC RANCH | Sheridan County, WY | Gas Property | Jun 2015 |
| 505 | AC-8 BROWN ALTMAN | Winkler County, TX | Oil & Gas Property | Nov 2018 |
| 506 | AC360 | Tarrant County, TX | Gas Property | Nov 2018 |
| 507 | ACAA | Allegheny County, PA | Gas Property | Dec 2018 |
| 508 | ACACIA COUNTRY CLUB | Cuyahoga County, OH | Oil & Gas Property | Dec 2017 |
| 509 | ACACIA CS FED | Campbell County, WY | Gas Property | Aug 2018 |
| 510 | ACADIA | Gonzales County, TX | Oil & Gas Property | Nov 2018 |
| 511 | ACADIA 31-25H | McKenzie County, ND | Oil & Gas Property | Jan 2019 |
| 512 | ACADIA B | Acadia Parish, LA | Oil Property | Jul 2018 |
| 513 | ACCETTOLO, PATRICIA & LOUIS | Marshall County, WV | Oil & Gas Property | Dec 2017 |
| 514 | ACCURSO-PORTER | Burleson County, TX | Oil & Gas Property | Oct 2018 |
| 515 | ACE 1-14 | Ness County, KS | Oil Property | Nov 2018 |
| 516 | ACE 118 | Ochiltree County, TX | Oil & Gas Property | Nov 2018 |
| 517 | ACE L06H | Reeves County, TX | Gas Property | Nov 2018 |
| 518 | ACE UNIT | Denton County, TX | Gas Property | Nov 2018 |
| 519 | ACE UNIT | Moffat County, CO | Oil & Gas Property | Dec 2018 |
| 520 | ACE UNT WELL NO 10 | Moffat County, CO | Oil & Gas Property | Dec 2018 |
| 521 | ACEE PURE MILK CO | Logan County, AR | Gas Property | Nov 2018 |
| 522 | ACELA | Zapata County, TX | Gas Property | Nov 2018 |
| 523 | ACERNI | Armstrong County, PA | Oil & Gas Property | Dec 2018 |
| 524 | ACERNI | Armstrong County, PA | Gas Property | Dec 2018 |
| 525 | ACEVEDO | Starr County, TX | Gas Property | Mar 2018 |
| 526 | ACEVEDO-HAERING | Webb County, TX | Gas Property | Nov 2018 |
| 527 | ACHATZ | Barton County, KS | Oil Property | Nov 2018 |
| 528 | ACHEN FREY DM | Eddy County, NM | Oil & Gas Property | Dec 2016 |
| 529 | ACHENBACH | Barber County, KS | Oil & Gas Property | Nov 2018 |
| 530 | ACHENBACH | Barber County, KS | Oil & Gas Property | Nov 2018 |
| 531 | ACHENBACH | Barber County, KS | Oil & Gas Property | Nov 2018 |
| 532 | ACHERON | Shelby County, TX | Oil & Gas Property | Oct 2018 |
| 533 | ACHESON | Graham County, KS | Oil Property | Nov 2018 |
| 534 | ACHILLES 1-22H | Lincoln County, OK | Gas Property | Jan 2019 |
| 535 | ACHTERBERG ANTON | Guadalupe County, TX | Oil & Gas Property | Oct 2018 |
| 536 | ACHZIGER | Weld County, CO | Oil & Gas Property | Nov 2018 |
| 537 | ACIN ALLEN&PRYOR | Boone County, WV | Gas Property | Sep 2017 |
| 538 | ACIN LL | Kanawha County, WV | Oil & Gas Property | Dec 2017 |
| 539 | ACIN LLC | Letcher County, KY | Oil & Gas Property | Dec 2015 |
| 540 | ACIN LLC ALLEN&PRYOR | Boone County, WV | Oil & Gas Property | Sep 2017 |
| 541 | ACIN, LLC 16 | Letcher County, KY | Gas Property | Dec 2015 |
| 542 | ACKER | Pittsburg County, OK | Gas Property | Dec 2018 |
| 543 | ACKER | Fayette County, TX | Oil & Gas Property | Nov 2018 |
| 544 | ACKER | McMullen County, TX | Oil & Gas Property | Oct 2018 |
| 545 | ACKER | Rusk County, TX | Gas Property | Nov 2018 |
| 546 | ACKER | Manistee County, MI | Oil & Gas Property | May 2018 |
| 547 | ACKER | Campbell County, WY | Gas Property | Apr 2016 |
| 548 | ACKER | Hocking County, OH | Oil Property | Dec 2017 |
| 549 | ACKER | Wayne County, OH | Oil & Gas Property | Dec 2017 |
| 550 | ACKER #12 | Tuscaloosa County, AL | Gas Property | Dec 2018 |
| 551 | ACKER C | Susquehanna County, PA | Gas Property | Dec 2018 |
| 552 | ACKER UNIT NO | McMullen County, TX | Gas Property | Nov 2018 |
| 553 | ACKERLY | Martin County, TX | Oil & Gas Property | Nov 2018 |
| 554 | ACKERLY DAVENPORT 11 | Dawson County, TX | Oil & Gas Property | Nov 2018 |
| 555 | ACKERLY DAVENPORT 16A | Martin County, TX | Oil & Gas Property | Nov 2018 |
| 556 | ACKERLY LANGHAM 24 | Martin County, TX | Oil & Gas Property | Nov 2018 |
| 557 | ACKERLY/DEAN/FIELDUNIT | Dawson County, TX | Oil & Gas Property | Nov 2018 |
| 558 | ACKERMAN | Allegany County, NY | Oil & Gas Property | Dec 2017 |
| 559 | ACKERMAN | Stafford County, KS | Gas Property | Nov 2018 |
| 560 | ACKERMAN | Monroe County, OH | Oil & Gas Property | Dec 2017 |
| 561 | ACKERMAN | Gray County, TX | Gas Property | Nov 2018 |
| 562 | ACKERMAN | Grant County, KS | Gas Property | Nov 2018 |
| 563 | ACKERMAN | Weston County, WY | Oil & Gas Property | Jan 2019 |
| 564 | ACKERS | Stephens County, TX | Oil & Gas Property | Nov 2018 |
| 565 | ACKERS | Shackelford County, TX | Oil & Gas Property | Oct 2018 |
| 566 | ACKERS 80 | Callahan County, TX | Oil & Gas Property | Nov 2018 |
| 567 | ACKERS MORRIS SAND UNIT | Shackelford County, TX | Oil & Gas Property | Nov 2018 |
| 568 | ACKERS RANCH 26 TANNEHILL SD. U | Shackelford County, TX | Oil & Gas Property | Oct 2018 |
| 569 | ACKERS-STATE (CADDO) UNIT | Stephens County, TX | Oil & Gas Property | May 2000 |
| 570 | ACKLEY | Cattaraugus County, NY | Gas Property | Dec 2017 |
| 571 | ACKLINS 6092 12-18H | Burke County, ND | Oil & Gas Property | Jan 2019 |
| 572 | ACLA | Bradford County, PA | Gas Property | Dec 2018 |
| 573 | ACLCO HAY G.U. 2 1H | Angelina County, TX | Gas Property | Nov 2018 |
| 574 | ACLCO HAY GU 1H | Angelina County, TX | Gas Property | Nov 2018 |
| 575 | ACLCO UNIT | Nacogdoches County, TX | Gas Property | Nov 2018 |
| 576 | ACLETO CREEK WATERFLOOD UNIT | Wilson County, TX | Oil & Gas Property | Nov 2018 |
| 577 | ACME | Los Angeles County, CA | Oil & Gas Property | Dec 2017 |
| 578 | ACME | Kern County, CA | Oil Property | Feb 2018 |
| 579 | ACME | Chaves County, NM | Gas Property | Oct 2018 |
| 580 | ACME 10 FEDERAL | Eddy County, NM | Oil & Gas Property | Sep 2018 |
| 581 | ACME 15 FEDERAL COM | Eddy County, NM | Oil & Gas Property | Sep 2018 |
| 582 | ACME BRICK | Nacogdoches County, TX | Gas Property | Nov 2018 |
| 583 | ACME BRICK | Denton County, TX | Gas Property | Nov 2018 |
| 584 | ACME BRICK | Sebastian County, AR | Gas Property | Dec 2018 |
| 585 | ACME LOT 420 | McKean County, PA | Oil Property | Dec 1995 |
| 586 | ACME UNIT | Denton County, TX | Gas Property | Nov 2018 |
| 587 | ACOLA | Wise County, TX | Gas Property | Nov 2018 |
| 588 | ACOLA 'B'-ACOLA 'A' (SA) 1H | Wise County, TX | Gas Property | Nov 2018 |
| 589 | ACOLA A -NEIL (SA) 1 | Wise County, TX | Gas Property | Nov 2018 |
| 590 | ACOLA C - ACOLA | Wise County, TX | Gas Property | Nov 2018 |
| 591 | ACOLA-ACOLA A (SA) 1H | Wise County, TX | Gas Property | Nov 2018 |
| 592 | ACOM | Chambers County, TX | Oil & Gas Property | Nov 2018 |
| 593 | ACORD | Weld County, CO | Oil & Gas Property | Dec 2018 |
| 594 | ACORN | Ventura County, CA | Oil & Gas Property | Aug 2006 |
| 595 | ACORN | Fresno County, CA | Oil Property | Jul 1991 |
| 596 | ACORN FAMILY | Johnson County, TX | Gas Property | Nov 2018 |
| 597 | ACORN UNIT | Dundy County, NE | Oil Property | Dec 2017 |
| 598 | ACOSTA | Borden County, TX | Oil & Gas Property | Nov 2018 |
| 599 | ACRE | Blaine County, OK | Gas Property | Aug 1998 |
| 600 | ACRE LAND CO | Cabell County, WV | Oil & Gas Property | Dec 2017 |