| 701 | Reserve Petroleum California Inc. | | Oil & Gas Operator | Dec 2025 |
| 702 | Resource Engineering | | Gas Operator | Nov 2024 |
| 703 | Richard P. Kelter | | Oil & Gas Operator | Dec 1996 |
| 704 | Richard Young & Associates | | Oil & Gas Operator | Dec 2004 |
| 705 | Rincon Island Limited Partnership | | Oil & Gas Operator | Nov 2022 |
| 706 | Rincon Oil Co. | | Oil & Gas Operator | Dec 1990 |
| 707 | Rio Bravo Poso | | Oil & Gas Operator | Dec 2009 |
| 708 | RMR Energy Resources | | Oil Operator | Dec 2025 |
| 709 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 710 | Road Oil Sales Inc. | Tyler, TX 75711 | Oil Operator | Dec 1984 |
| 711 | Robert A. Cohan | | Oil & Gas Operator | Jan 2018 |
| 712 | Robert D. VIgue | | Oil Operator | Dec 2000 |
| 713 | Robert E. & Ruby C. Beasley Trustees | | Oil & Gas Operator | Dec 1990 |
| 714 | Robert Sumpf | | Gas Operator | Dec 1990 |
| 715 | Robert W. Berry Inc. | | Gas Operator | Dec 1988 |
| 716 | Robert W. Lee Investments | | Oil & Gas Operator | Dec 1998 |
| 717 | Rohrig Petroleum Co. | | Oil & Gas Operator | Dec 1998 |
| 718 | Romara Energy Inc. | | Oil & Gas Operator | Dec 2017 |
| 719 | Rose Katherine Stone | | Oil & Gas Operator | Dec 2025 |
| 720 | Rosemain 031 LLC | | Oil & Gas Operator | Dec 2025 |
| 721 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2026 |
| 722 | Rothschild Oil Co. | | Oil Operator | Dec 1982 |
| 723 | Rountree/Wright Enterprises LLC | | Oil Operator | Dec 2025 |
| 724 | Roya Resources LLC | | Oil & Gas Operator | Mar 2022 |
| 725 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Dec 2025 |
| 726 | S & C Oil Co. Inc. | | Oil & Gas Operator | Dec 2025 |
| 727 | S & D Energy Associates Inc. | | Gas Operator | Dec 1986 |
| 728 | S & S Oil Company LLC | | Oil Operator | Dec 2025 |
| 729 | S. A. Camp Companies | | Oil & Gas Operator | Dec 1998 |
| 730 | S. H. Montgomery | | Oil & Gas Operator | Dec 1996 |
| 731 | S. M. Reynolds Opr. | | Gas Operator | Dec 1990 |
| 732 | Saba Petroleum Inc. | | Oil & Gas Operator | Mar 2006 |
| 733 | Sacramento Energy Inc. | | Oil & Gas Operator | Dec 2025 |
| 734 | Sacramento Oil & Gas Co. | | Gas Operator | Dec 2003 |
| 735 | Sage-California | | Oil Operator | Dec 1988 |
| 736 | Sampson Operators | | Oil & Gas Operator | Dec 2025 |
| 737 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 738 | San Carlos Oil & Gas Corp. | | Gas Operator | Dec 2003 |
| 739 | San Joaquin Facilities Management Inc. | | Oil & Gas Operator | Dec 2025 |
| 740 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 741 | Santa Fe Energy Operating Partners L P | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 742 | Santa Fe Minerals | | Gas Operator | Dec 1993 |
| 743 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 744 | Santa Maria Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 745 | Say Energy Inc. | | Oil & Gas Operator | Dec 2004 |
| 746 | Seaward Resources Inc. | | Gas Operator | Dec 1984 |
| 747 | Second Wind Production Company Inc. | | Oil Operator | Dec 2013 |
| 748 | Security Pacific National Bank | | Oil Operator | Dec 1990 |
| 749 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Feb 2026 |
| 750 | Seneca Western Minerals Corp. | | Oil & Gas Operator | Dec 2009 |
| 751 | Sentinel Peak Resources California LLC | | Oil & Gas Operator | Dec 2025 |
| 752 | Sequoia Exploration Inc. | | Oil & Gas Operator | Dec 2025 |
| 753 | Shadow Wolf Energy LLC | | Oil Operator | Dec 2025 |
| 754 | Shell Calif. Prod. Inc. | | Oil Operator | Dec 1980 |
| 755 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 756 | Shelly Energy Inc | Berwyn, PA 19312 | Oil & Gas Operator | Feb 2026 |
| 757 | Sherman Havens | | Oil & Gas Operator | Dec 2025 |
| 758 | Shirley M. Lechler | | Oil & Gas Operator | Dec 2001 |
| 759 | Shoshone Oil Corp. | | Oil & Gas Operator | Dec 2005 |
| 760 | Sierra Reserve Company | | Oil Operator | Dec 1985 |
| 761 | Sierra Resources, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 762 | Signal Hill Petroleum Inc. | | Oil & Gas Operator | Dec 2025 |
| 763 | Silver Exploration Company | | Oil & Gas Operator | Dec 2025 |
| 764 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 765 | SM&O LLC | | Oil & Gas Operator | Dec 2025 |
| 766 | Soc Resources Inc. | | Oil & Gas Operator | Dec 2024 |
| 767 | Sojitz Energy Venture, Inc. | Houston, TX 77042 | Oil & Gas Operator | Feb 2018 |
| 768 | Solimar Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 769 | Source Energy Corp. | | Gas Operator | Aug 2022 |
| 770 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 771 | South Fork Ranch | | Oil & Gas Operator | Feb 2013 |
| 772 | Southern California Gas Company | | Oil & Gas Operator | Dec 2025 |
| 773 | Southridge Homes | | Oil & Gas Operator | Dec 1999 |
| 774 | St. James Oil Corporation | | Oil & Gas Operator | Dec 2009 |
| 775 | Standing Bear Petroleum Inc. | | Oil & Gas Operator | Dec 2005 |
| 776 | State Lands Commission | | Oil & Gas Operator | Dec 2025 |
| 777 | Stephen W. Bradford | | Oil Operator | Dec 1996 |
| 778 | Steve Smith | | Gas Operator | Dec 1987 |
| 779 | Steven A. Sayce | | Oil Operator | Jan 2021 |
| 780 | Stinnett Oil Company | | Oil Operator | Dec 1997 |
| 781 | Stockdale Energy Co. | | Gas Operator | Dec 1992 |
| 782 | Stockdale Oil & Gas Inc. | | Oil & Gas Operator | Dec 2001 |
| 783 | Stone Cabin Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 784 | Storm Industries | | Oil & Gas Operator | Dec 1988 |
| 785 | Stowe Killingsworth | | Oil & Gas Operator | Apr 2023 |
| 786 | Strata-X Inc. | | Oil & Gas Operator | Dec 2025 |
| 787 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 788 | Summit Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 789 | Summit Exploration (California) LLC | | Oil & Gas Operator | Feb 2018 |
| 790 | Sumpf-Williams | | Gas Operator | Dec 1980 |
| 791 | Sun Mountain Oil & Gas | | Oil & Gas Operator | Dec 2020 |
| 792 | Sunray Petroleum Inc. | | Oil & Gas Operator | Dec 2025 |
| 793 | Sunset Exploration Inc. | | Oil & Gas Operator | Dec 2025 |
| 794 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 795 | Superior Well Service Inc. | | Oil & Gas Operator | Sep 2007 |
| 796 | Sycamore Development Partners LLC | | Oil & Gas Operator | Dec 2025 |
| 797 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Dec 2025 |
| 798 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |
| 799 | T. A. Atkinson Opr. | | Gas Operator | Dec 1997 |
| 800 | T. E. Adams Petroleum Corp. | | Oil & Gas Operator | Dec 2025 |