| 601 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 602 | NWG Operating LLC | Canyon, TX 79015 | Oil & Gas Operator | Apr 2024 |
| 603 | O'Neal Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1999 |
| 604 | Oakmont Oil And Gas | Graham, TX 76450 | Oil Operator | Apr 2024 |
| 605 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 606 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2024 |
| 607 | Oklahoma Ea II, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2004 |
| 608 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2024 |
| 609 | Older Than Dirt LLC | Palo Pinto, TX 76484 | Oil & Gas Operator | Apr 2024 |
| 610 | Ole Chaparral On Possum Kingdom | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1997 |
| 611 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 612 | Olney Properties, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2003 |
| 613 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2024 |
| 614 | Osceola Oil & Gas Corporation | Somerset, TX 78069 | Oil & Gas Operator | Aug 1994 |
| 615 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2024 |
| 616 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 617 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 618 | Pacific Exploration Oper Co, LLC | Houston, TX 77057 | Oil Operator | Apr 2024 |
| 619 | Paleo Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 620 | Palmer Operating LLC | Megargel, TX 76370 | Oil Operator | Apr 2024 |
| 621 | Palmer Tank Trucks, Inc. | Olney, TX 76374 | Oil & Gas Operator | Mar 2008 |
| 622 | Palmer, John LLC | Megargel, TX 76370 | Oil & Gas Operator | Apr 2024 |
| 623 | Palmer, Mike Oil | Megargel, TX 76370 | Oil & Gas Operator | Mar 2021 |
| 624 | Palmer, Scott Oil | Olney, TX 76374 | Oil Operator | Feb 2023 |
| 625 | Palo Pinto Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1998 |
| 626 | Panther City Energy LLC | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 627 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 628 | Paschal Petroleum, Inc. | Dallas, TX 75380 | Oil & Gas Operator | Apr 1994 |
| 629 | Peba Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jun 2015 |
| 630 | Peden, Marshell | Archer City, TX 76351 | Oil & Gas Operator | Apr 2024 |
| 631 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 632 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 633 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 634 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2024 |
| 635 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 636 | Permex Petroleum Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 637 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 638 | Perry Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 639 | Peterson & Roberts | Loving, TX 76460 | Oil & Gas Operator | Mar 1998 |
| 640 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2024 |
| 641 | Peterson, Don Company | Loving, TX 76460 | Oil & Gas Operator | Jul 2017 |
| 642 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 643 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 644 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 645 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 646 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 647 | Phoenix Petrocorp, Inc. | McKinney, TX 75070 | Oil & Gas Operator | Feb 2024 |
| 648 | Pinewood Exploration Inc. | Arlington, TX 76096 | Oil & Gas Operator | Oct 2011 |
| 649 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 650 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 651 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 652 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Apr 2024 |
| 653 | Porter, E. J. | Mingus, TX 76463 | Gas Operator | Jan 2011 |
| 654 | Powder River Resources, LLC | Archer City, TX 76351 | Oil & Gas Operator | Apr 2024 |
| 655 | Prickett, Jimmy | Wichita Falls, TX 76308 | Oil Operator | Feb 2002 |
| 656 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 657 | Pro. Energy I Resource, LLC | Haslet, TX 76052 | Oil Operator | Apr 2024 |
| 658 | Progas Operating, Inc | Red Rock, TX 78662 | Oil & Gas Operator | Apr 2024 |
| 659 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 660 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 661 | Pursley, John | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 662 | PV Oil Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 663 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 664 | Quatro Oil And Gas, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 665 | Quest Petroleum Company | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 666 | Quest-Tex Energy Op II, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 667 | R.J. Riley Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 668 | Rainwater, John | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 669 | Ram Oil And Gas, Inc. | Walsh, CO 81090 | Oil Operator | Apr 2024 |
| 670 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 671 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 672 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 673 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 674 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 675 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 676 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 677 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 678 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Apr 2024 |
| 679 | Reese Wellsite Supervision, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 680 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 681 | Rehoboth Oil & Gas LLC | Baytown, TX 77521 | Oil Operator | Oct 2011 |
| 682 | Remington Oil | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 683 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Apr 2024 |
| 684 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2024 |
| 685 | Retamco Operating Inc | Red Lodge, MT 59068-0790 | Oil & Gas Operator | Jan 2024 |
| 686 | Reynolds, E. P., Jr. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 687 | Rhodes Disposal, Inc. | Bryson, TX 76427 | Oil Operator | Apr 2024 |
| 688 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 689 | Richards, Michael Dewain | Graham, TX 76450 | Oil & Gas Operator | Apr 2011 |
| 690 | Richards, Tot Oil Co. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 691 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 692 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 693 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 694 | Riggs Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 695 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 696 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Jan 2024 |
| 697 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Apr 2024 |
| 698 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |
| 699 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2024 |
| 700 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |