| 601 | Peterson, Don Company | Loving, TX 76460 | Oil & Gas Operator | Jul 2017 |
| 602 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 603 | Petro Drilling & Producing Co. | Archer City, TX 76351 | Oil & Gas Operator | Apr 1997 |
| 604 | Pfed Operating | Keller, TX 76248 | Oil Operator | Apr 2026 |
| 605 | Phillips & Pierson | Olney, TX 76374 | Oil & Gas Operator | Nov 1995 |
| 606 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 607 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 608 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 609 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 610 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2026 |
| 611 | Platinum Properties Inc. | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 612 | Playa Minerals & Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2003 |
| 613 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 614 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 615 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Apr 2026 |
| 616 | Portana Properties LLC | McKinney, TX 75072 | Oil Operator | Apr 2026 |
| 617 | Powder River Resources, LLC | Archer City, TX 76351 | Oil & Gas Operator | Apr 2026 |
| 618 | Pro. Energy I Resource, LLC | Haslet, TX 76052 | Oil Operator | Apr 2026 |
| 619 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 620 | Quatro Oil And Gas, Inc. | Joshua, TX 76058 | Oil & Gas Operator | Apr 2026 |
| 621 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 622 | Quinlan Engineering | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 623 | R & R Operating | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2004 |
| 624 | R. J. Oil Co. | Olney, TX 76374 | Oil & Gas Operator | May 2025 |
| 625 | R.J. Riley Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 626 | R2Q Operating LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 627 | Rainwater, John | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 628 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 629 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 630 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 631 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 632 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 633 | Raymond'S Operating, Inc. | Kamay, TX 76369 | Oil & Gas Operator | Apr 2026 |
| 634 | Red River Operating & DRLG. Co. | Wylie, TX 75098 | Oil & Gas Operator | Apr 2026 |
| 635 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Apr 2026 |
| 636 | Regal Operating | Cisco, TX 76437 | Oil & Gas Operator | Mar 2008 |
| 637 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 638 | Rehoboth Oil & Gas LLC | Baytown, TX 77521 | Oil Operator | Oct 2011 |
| 639 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 640 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Apr 2026 |
| 641 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2026 |
| 642 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 643 | Revier Resources Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2005 |
| 644 | Reynolds, J. C. & W. F. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 645 | Richland Energy, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2026 |
| 646 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 647 | Riggs Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 648 | Rio Bravo Production, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 649 | Rio O & P LLC | Pasadena, TX 77504 | Oil Operator | Apr 2026 |
| 650 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |
| 651 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 652 | Rock Creek Oil Co. | Iowa Park, TX 76367 | Oil Operator | Mar 2008 |
| 653 | Rocking, R, Drilling & Prod Co. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2026 |
| 654 | Rocky Point Oil, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 655 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 656 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 657 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 658 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 659 | Rover Operating Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 660 | Royal Oil LTD. Co. | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 661 | Royal Petroleum Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 662 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 663 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Apr 2026 |
| 664 | Rucker, Gary | Archer City, TX 76351 | Oil & Gas Operator | Dec 2003 |
| 665 | Ruthson Energy, Inc. | Judson, TX 75660 | Oil Operator | Apr 2026 |
| 666 | Rutledge, Rome | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1997 |
| 667 | Rutledge-Newsom | Graham, TX 76450 | Oil Operator | Jun 2025 |
| 668 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2026 |
| 669 | Ryan, Joseph G. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 670 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 671 | S & H Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 1999 |
| 672 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 673 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | Apr 2026 |
| 674 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 675 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 676 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 677 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 678 | Scan Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 679 | Schaefer, Gary L. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2017 |
| 680 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 681 | Schenk Oil Co. | Scotland, TX 76379 | Oil Operator | Apr 2026 |
| 682 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 683 | Schlittler, Willard | Bryson, TX 76427 | Oil & Gas Operator | Apr 2026 |
| 684 | Schreiber, Lloyd | Scotland, TX 76379 | Oil & Gas Operator | Dec 2000 |
| 685 | Scott, Stephen | Olney, TX 76374 | Oil Operator | Oct 2011 |
| 686 | Scribner, Jeff | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2004 |
| 687 | Seel-Mac Oil & Gas LLC | Richardson, TX 75080 | Oil Operator | Jul 2011 |
| 688 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 689 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 690 | Seisma Drilling Corporation | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 691 | Seismotech Energy, Incorporated | Plano, TX 75075 | Oil & Gas Operator | Aug 2003 |
| 692 | Seneca Exploration, LLC | Wichita Falls, TX 76308 | Oil Operator | Apr 2026 |
| 693 | Sep, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1994 |
| 694 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Apr 2026 |
| 695 | Shanks, Bob | Haskell, OK 74436 | Oil Operator | Sep 2002 |
| 696 | Shappell Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Sep 2012 |
| 697 | Shappell Oil Company, L.L.C. | Harrisonburg, LA 71340 | Oil & Gas Operator | Apr 2026 |
| 698 | Shawver & Shawver | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 699 | Shearer Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2002 |
| 700 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |