| 1 | S O A L LLC | Farmington, NM 87499-2165 | Oil & Gas Operator | Jun 2023 |
| 2 | S O Utah | Irvine, CA 92715 | Oil & Gas Operator | Sep 1994 |
| 3 | S W Energy Corporation | Salt Lake City, UT 84102 | Oil & Gas Operator | May 2020 |
| 4 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 7 | San Juan Minerals Explor | Mexican Hat, UT 84531 | Oil & Gas Operator | Apr 2006 |
| 8 | Sanchez-Obrien Oil & Gas | | Oil & Gas Operator | Aug 1986 |
| 9 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 10 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 11 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 12 | Saturn Resources Corp | Springboro, OH 45066 | Oil & Gas Operator | Dec 1998 |
| 13 | Savoy Energy, LLC | Ephraim, UT 84627 | Gas Operator | Dec 2025 |
| 14 | Schuster Homes Inc | Rangely, CO 81648 | Oil & Gas Operator | Apr 2013 |
| 15 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 16 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Dec 2025 |
| 17 | Sego Resources Corp | Denver, CO 80293-0621 | Oil & Gas Operator | Dec 1999 |
| 18 | Sep Cisco Dome II, LLC | Orem, UT 84097 | Oil & Gas Operator | Nov 2025 |
| 19 | Sep Cisco Dome LLC | Orem, UT 84097 | Oil & Gas Operator | Mar 2015 |
| 20 | Sep Nosr LLC | Orem, UT 84097 | Oil & Gas Operator | Nov 2025 |
| 21 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 22 | Sharples Oil Co | | Oil & Gas Operator | May 1965 |
| 23 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 24 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 25 | Shiny One Operating Company, LLC | Vernal, UT 84078 | Oil & Gas Operator | Dec 2025 |
| 26 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Feb 2026 |
| 27 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 28 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 29 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 30 | Skyline Operating Company, LLC | Alpine, UT 84004 | Oil & Gas Operator | Dec 2025 |
| 31 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 32 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 33 | Smoot, Richard P | Salt Lake City, UT 84102 | Oil & Gas Operator | Oct 2010 |
| 34 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 35 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 36 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 37 | Sohio-Stand Oil Prod Co | Houston, TX 77210-9928 | Oil & Gas Operator | Jan 1989 |
| 38 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 39 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 40 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 41 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 42 | Standard Oil Co Of Calif | | Oil & Gas Operator | Dec 1983 |
| 43 | Star Oil Operating Company LLC | Laramie, WY 82073 | Oil & Gas Operator | Jan 2026 |
| 44 | Sterling Energy Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1995 |
| 45 | Stevenson, Albert | | Oil & Gas Operator | Jun 1979 |
| 46 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 47 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 48 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 49 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 50 | Subsurface Resources Inc | Logan, UT 84321 | Oil & Gas Operator | Aug 1990 |
| 51 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Nov 2025 |
| 52 | Sun Explor & Production Co | Oklahoma City, OK 73126 | Gas Operator | Oct 1984 |
| 53 | Sun Oil Company | Dallas, TX 75373 | Oil & Gas Operator | Dec 2021 |
| 54 | Sunfield Energy Company | Houston, TX 77084-5113 | Oil & Gas Operator | Jul 1999 |
| 55 | Sunray DX Oil Co | | Gas Operator | Dec 1983 |
| 56 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 57 | Supreme X Oil Company | | Oil & Gas Operator | Dec 1983 |
| 58 | Supron Energy Corp | | Oil & Gas Operator | Oct 1995 |
| 59 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 60 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 61 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 62 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Nov 2025 |