| 1 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Nov 2024 |
| 2 | Sagebrush Resources, LLC | | Oil & Gas Operator | Jan 2011 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 6 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2024 |
| 7 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 8 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Nov 2024 |
| 9 | Sedalia Energy, LLC | | Oil & Gas Operator | Mar 2018 |
| 10 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 11 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Aug 2024 |
| 12 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 13 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Nov 2024 |
| 14 | Siana Oil & Gas., L.L.C | | Oil & Gas Operator | Dec 2021 |
| 15 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 16 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 17 | Silver Thread Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2015 |
| 18 | Simray GP, LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2015 |
| 19 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Nov 2024 |
| 20 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 21 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 22 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2024 |
| 23 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Nov 2024 |
| 24 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Nov 2024 |
| 25 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 26 | South Heart Company | | Oil Operator | Aug 2010 |
| 27 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 28 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 29 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 30 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 31 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Sep 2024 |
| 32 | Sparrow Oil & Gas LLC | | Oil & Gas Operator | Oct 2024 |
| 33 | Specialized Technological Threading, Inc., | | Oil & Gas Operator | Oct 2019 |
| 34 | Spotted Hawk Development, LLC | | Oil & Gas Operator | Sep 2024 |
| 35 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 36 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 37 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 38 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 39 | Stearns Oil Company LLC | Willison, ND 58801 | Oil & Gas Operator | Sep 2024 |
| 40 | Stekoll Oil & Gas, LTD. | | Oil Operator | Jun 1963 |
| 41 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2024 |
| 42 | Stephens Energy Company LLC | | Oil & Gas Operator | Jun 2012 |
| 43 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Sep 2024 |
| 44 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 45 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 46 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 47 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 48 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |