| 601 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 602 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 603 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Feb 2024 |
| 604 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 605 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 606 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 607 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2024 |
| 608 | Platinum Properties Inc. | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 609 | Playa Minerals & Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2003 |
| 610 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 611 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 612 | Powder River Resources, LLC | Archer City, TX 76351 | Oil & Gas Operator | Apr 2024 |
| 613 | Pro. Energy I Resource, LLC | Haslet, TX 76052 | Oil Operator | Apr 2024 |
| 614 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 615 | Quatro Oil And Gas, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 616 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 617 | Quinlan Engineering | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 618 | R & R Operating | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2004 |
| 619 | R. J. Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Nov 2023 |
| 620 | R.J. Riley Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 621 | R2Q Operating LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2024 |
| 622 | Rainwater, John | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 623 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 624 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 625 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 626 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 627 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 628 | Raymond'S Operating, Inc. | Kamay, TX 76369 | Oil & Gas Operator | Apr 2024 |
| 629 | Red River Operating & DRLG. Co. | Allen, TX 75002 | Oil & Gas Operator | Apr 2024 |
| 630 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Apr 2024 |
| 631 | Regal Operating | Cisco, TX 76437 | Oil & Gas Operator | Mar 2008 |
| 632 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 633 | Rehoboth Oil & Gas LLC | Baytown, TX 77521 | Oil Operator | Oct 2011 |
| 634 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 635 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Apr 2024 |
| 636 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2024 |
| 637 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 638 | Revier Resources Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2005 |
| 639 | Reynolds, J. C. & W. F. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 640 | Richland Energy, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 641 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 642 | Riggs Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 643 | Rio O & P LLC | Pasadena, TX 77504 | Oil Operator | Apr 2024 |
| 644 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |
| 645 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 646 | Rock Creek Oil Co. | Iowa Park, TX 76367 | Oil Operator | Mar 2008 |
| 647 | Rock Energy Resources, LLC | Dallas, TX 75251 | Oil Operator | Apr 2024 |
| 648 | Rocking, R, Drilling & Prod Co. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2024 |
| 649 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 650 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2024 |
| 651 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 652 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 653 | Rover Operating Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 654 | Royal Oil LTD. Co. | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 655 | Royal Petroleum Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2024 |
| 656 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 657 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Apr 2024 |
| 658 | Rucker, Gary | Archer City, TX 76351 | Oil & Gas Operator | Dec 2003 |
| 659 | Ruthson Energy, Inc. | Judson, TX 75660 | Oil Operator | Apr 2024 |
| 660 | Rutledge, Rome | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1997 |
| 661 | Rutledge-Newsom | Wichita Falls, TX 76308 | Oil Operator | Apr 2024 |
| 662 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2024 |
| 663 | Ryan, Joseph G. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 664 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 665 | S & H Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 1999 |
| 666 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 667 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | Apr 2024 |
| 668 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 669 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 670 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 671 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 672 | Scan Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 673 | Schaefer, Gary L. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2017 |
| 674 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 675 | Schenk Oil Co. | Scotland, TX 76379 | Oil Operator | Apr 2024 |
| 676 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 677 | Schlittler, Willard | Bryson, TX 76427 | Oil & Gas Operator | Apr 2024 |
| 678 | Schreiber, Lloyd | Scotland, TX 76379 | Oil & Gas Operator | Dec 2000 |
| 679 | Scott, Stephen | Olney, TX 76374 | Oil Operator | Oct 2011 |
| 680 | Scribner, Jeff | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2004 |
| 681 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 682 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 683 | Seisma Drilling Corporation | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 684 | Seismotech Energy, Incorporated | Plano, TX 75075 | Oil & Gas Operator | Aug 2003 |
| 685 | Sep, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1994 |
| 686 | Service Clearing Corp. | Dallas, TX 75229 | Oil & Gas Operator | Apr 2024 |
| 687 | Shanks, Bob | Haskell, OK 74436 | Oil Operator | Sep 2002 |
| 688 | Shappell Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Sep 2012 |
| 689 | Shappell Oil Company, L.L.C. | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 690 | Shawver & Shawver | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 691 | Shearer Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2002 |
| 692 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 693 | Shelley, Richard W | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2015 |
| 694 | Sherley, O. C. | Megargel, TX 76370 | Oil & Gas Operator | Aug 2003 |
| 695 | SHL Operating | Lubbock, TX 79416 | Oil & Gas Operator | Apr 2024 |
| 696 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 697 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 698 | Simmons, Stanley J. | Olney, TX 76374 | Oil & Gas Operator | Aug 1994 |
| 699 | Sissom Oil | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 700 | Sissom Oil Field Services, LLC | Wichita Falls, TX 76308 | Oil Operator | Apr 2024 |