| 601 | Smith Energy 1986a Partnership | Alvin, TX 77511 | Oil & Gas Operator | Feb 2010 |
| 602 | Smith Energy Operating Company | Lubbock, TX 79423 | Oil & Gas Operator | Mar 2026 |
| 603 | Smith Family LTD Partnership | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2004 |
| 604 | Smith Oil Co. | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 605 | Smith Operating & Management Co. | Shreveport, LA 71161 | Oil & Gas Operator | Feb 2005 |
| 606 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 607 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 608 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 609 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 610 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2026 |
| 611 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jun 2026 |
| 612 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Jun 2026 |
| 613 | Smith Vacuum Service | Snyder, TX 79550 | Oil & Gas Operator | Jun 2026 |
| 614 | Smith, David | Wichita Falls, TX 76310 | Oil Operator | Jun 2026 |
| 615 | Smith, E. J. | Fort Worth, TX 76137 | Oil & Gas Operator | Jun 2026 |
| 616 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 617 | Smith, Joe H. | Argyle, TX 76226 | Oil & Gas Operator | Nov 1998 |
| 618 | Smith, John A. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 619 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Jun 2026 |
| 620 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Jun 2026 |
| 621 | Smith, O. Dale & Smith, A. C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2000 |
| 622 | Smith, R. E. Interests, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 1998 |
| 623 | Smith, Ted H. | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 1998 |
| 624 | Smith, W. Don | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2001 |
| 625 | Smith, W.T. | Panhandle, TX 79068 | Oil & Gas Operator | Nov 2005 |
| 626 | SMR Natural Gas Ventures Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 1999 |
| 627 | Smulcer, Jimmy A. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2002 |
| 628 | Smyth Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2003 |
| 629 | Smyth Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 630 | SN Ef Maverick, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2023 |
| 631 | SN Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 632 | Snappy Services, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jun 2026 |
| 633 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 634 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 635 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | Jun 2026 |
| 636 | Snow Operating Co., Inc. | Haltom City, TX 76117 | Oil & Gas Operator | Feb 2024 |
| 637 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 638 | Snuggs Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Jan 2024 |
| 639 | SNW Operating Company | Borger, TX 79008 | Oil & Gas Operator | Jun 2026 |
| 640 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Jun 2026 |
| 641 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 642 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Feb 2026 |
| 643 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Jun 2026 |
| 644 | Socorro Exploration, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jun 2026 |
| 645 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Apr 2026 |
| 646 | Sogc, LLC | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Jun 2026 |
| 647 | Sogo III LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2017 |
| 648 | Soil Energy, Inc. | Imperial, TX 79743 | Oil & Gas Operator | Jun 2026 |
| 649 | Sojitz Energy Venture, Inc. | Houston, TX 77042 | Oil & Gas Operator | Feb 2018 |
| 650 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jun 2026 |
| 651 | Sol Oil Co., L.C. | Crane, TX 79731 | Oil Operator | Jun 2026 |
| 652 | Sola Operating, LLC | Trout, LA 71371 | Oil Operator | Jun 2026 |
| 653 | Solano Gas Processing, Inc. | Austin, TX 78759 | Oil & Gas Operator | Aug 1998 |
| 654 | Solar Exploration TX LLC | Tulsa, OK 74133 | Oil Operator | Dec 2018 |
| 655 | Solatex Resources, LTD | Houston, TX 77257 | Oil & Gas Operator | Jun 2026 |
| 656 | Soldier Creek Energy, LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 657 | Solis Partners, L.L.C. | Midland, TX 79704 | Oil & Gas Operator | Mar 2026 |
| 658 | Sollohub Petro LLC | Von Ormy, TX 78073 | Oil Operator | Jun 2026 |
| 659 | Solo Oil & Gas Company LLC | Laredo, TX 78045 | Oil Operator | Jun 2026 |
| 660 | Solutions Projects And Consulting, LLC | Houston, TX 77070 | Oil Operator | Jun 2026 |
| 661 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 662 | Somerset Operating, LLC | Aledo, TX 76008 | Gas Operator | Jun 2026 |
| 663 | Somex Energy Company | San Antonio, TX 78230 | Oil & Gas Operator | Mar 2002 |
| 664 | Somont Oil Co., Inc. | Spring, TX 77379 | Oil & Gas Operator | Mar 2026 |
| 665 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 666 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 667 | Sonat Exploration Co. - Midland | Houston, TX 77251 | Oil & Gas Operator | Mar 1999 |
| 668 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 669 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 670 | Sonat Exploration Gom Inc. | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 671 | Sonerra Resources Corporation | Nacogdoches, TX 75963 | Oil & Gas Operator | Jun 2026 |
| 672 | Sonoble Operating, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2003 |
| 673 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Jun 2026 |
| 674 | Sonoran Energy Inc. | Addison, TX 75001 | Oil & Gas Operator | Jun 2026 |
| 675 | Sonterra Oil & Gas, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Jun 2026 |
| 676 | Sonterra Operating, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 677 | Soto Inc. | Ozona, TX 76943 | Oil & Gas Operator | Aug 2020 |
| 678 | Sotol Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2025 |
| 679 | Sounion Petroleum Incorporated | Baltimore, MD 21218 | Oil & Gas Operator | Aug 1994 |
| 680 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Jun 2026 |
| 681 | South Bay Resources, L.L.C. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2026 |
| 682 | South Central Texas Oil & Gas Co | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 683 | South Florida Investment Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 1997 |
| 684 | South Forty Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 1993 |
| 685 | South Houston Production Company | Muenster, TX 76252 | Oil & Gas Operator | Jun 2026 |
| 686 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 687 | South Loop Operating, L.C. | San Antonio, TX 78279 | Oil & Gas Operator | Apr 2009 |
| 688 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 689 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Jun 2026 |
| 690 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 691 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 692 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 693 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2026 |
| 694 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 695 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 696 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Jun 2026 |
| 697 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 698 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 699 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 700 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |