| 601 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 602 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Apr 2026 |
| 603 | Oakmont Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 604 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 605 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2026 |
| 606 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 607 | Owl Creek Operating Co., Inc. | Denver, CO 80206 | Oil & Gas Operator | Apr 2026 |
| 608 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 609 | Owl Creek Production Co., LLC | Denver, CO 80265 | Oil & Gas Operator | Jan 2006 |
| 610 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2026 |
| 611 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 612 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 613 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 614 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 615 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Apr 2026 |
| 616 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 617 | Pan Petroleum Corp. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 618 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Apr 2026 |
| 619 | Panther City Energy LLC | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2026 |
| 620 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 621 | Pardue Oil | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2006 |
| 622 | Pardue Oil, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 623 | Paschal Petroleum, Inc. | Dallas, TX 75380 | Oil & Gas Operator | Apr 1994 |
| 624 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 625 | Pautsky, Jimmy | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 626 | Peba Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jun 2015 |
| 627 | Peba Oil & Gas, Inc. | Nocona, TX 76255 | Oil & Gas Operator | Apr 2026 |
| 628 | Pecos Country Operating Inc. | N Richlnd HLS, TX 76182 | Oil Operator | Apr 2026 |
| 629 | Pecos Valley Management Co. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2008 |
| 630 | Pecos Valley Operating Inc. | N Richlnd HLS, TX 76182 | Oil & Gas Operator | Apr 2026 |
| 631 | Peden, Marshell | Archer City, TX 76351 | Oil & Gas Operator | Apr 2026 |
| 632 | Pennartz Productions, LLC. | Jacksboro, TX 76458 | Oil Operator | Apr 2026 |
| 633 | Penntex Resources, L.P. | State College, PA 16803 | Oil & Gas Operator | Mar 2016 |
| 634 | Penny, Ralph E. | White Plains, NY 10601 | Oil & Gas Operator | Jul 2023 |
| 635 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 636 | Permex Petroleum Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 637 | Permian Basin Oil Corporation | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 638 | Perry Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 639 | Person Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2002 |
| 640 | Person, Claude | Bowie, TX 76230 | Oil & Gas Operator | Apr 2007 |
| 641 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2026 |
| 642 | Peterson, Don Company | Loving, TX 76460 | Oil & Gas Operator | Jul 2017 |
| 643 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 644 | Petrobal Omega 1, LLC | Little Elm, TX 75068 | Oil & Gas Operator | Apr 2026 |
| 645 | Petrocoastal, Inc. | Frisco, TX 75036 | Oil & Gas Operator | Apr 2026 |
| 646 | Phillips, Bob | Weatherford, TX 76086 | Oil & Gas Operator | Nov 2019 |
| 647 | Pine Creek Operating LLC | Colorado SPGS, CO 80903 | Oil & Gas Operator | Jul 2021 |
| 648 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 649 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 650 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2026 |
| 651 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Apr 2026 |
| 652 | Poteet Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 1994 |
| 653 | Prairie Petroleum, Inc | Plano, TX 75093 | Oil & Gas Operator | May 1999 |
| 654 | PRC Operating, Inc. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2026 |
| 655 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 656 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 657 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 658 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 659 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 660 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Apr 2026 |
| 661 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 662 | Pursley, John | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 663 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 664 | Quantum Investments | Lubbock, TX 79424 | Oil Operator | Apr 2026 |
| 665 | Quest Petroleum Company | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 666 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2026 |
| 667 | Rainwater, John | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 668 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 669 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 670 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 671 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 672 | Regal Energy Corporation | Rhome, TX 76078 | Oil & Gas Operator | Apr 2026 |
| 673 | Remington Oil | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 674 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 675 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Apr 2026 |
| 676 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2026 |
| 677 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 678 | Revier, J. B. Prod. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 1996 |
| 679 | Rhodes Disposal, Inc. | Bryson, TX 76427 | Oil Operator | Apr 2026 |
| 680 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2026 |
| 681 | Richards, Michael Dewain | Graham, TX 76450 | Oil & Gas Operator | Apr 2011 |
| 682 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 683 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2026 |
| 684 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 685 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 686 | Riggs Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 687 | Rimfire Resources, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 688 | Rio Bravo Production, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 689 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 690 | RKW Operating LLC | Weatherford, TX 76085 | Gas Operator | Apr 2026 |
| 691 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |
| 692 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 693 | Robertson, Gene Oil Co. | Burkburnett, TX 76354 | Oil & Gas Operator | Jul 1998 |
| 694 | Robinson Oil & Gas, Inc. | Chico, TX 76431 | Oil & Gas Operator | Aug 2003 |
| 695 | Robuck Petroleum, LLC | Nacogdoches, TX 75965 | Oil & Gas Operator | Apr 2026 |
| 696 | Rock Operating | Abilene, TX 79608 | Oil & Gas Operator | Apr 2026 |
| 697 | Rocking, R, Drilling & Prod Co. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2026 |
| 698 | Rockoil Energy Of Texas, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2026 |
| 699 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 700 | Rogers Oilfield Op, Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2019 |