| 1 | S & D LLC | | Oil & Gas Operator | Aug 2022 |
| 2 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Sep 2015 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 5 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Oct 2025 |
| 6 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Oct 2025 |
| 7 | Santa Fe Natural Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2021 |
| 8 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Dec 2025 |
| 9 | Schneider Energy Services Inc | | Oil & Gas Operator | Jul 2025 |
| 10 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 11 | Schutz* Richard E | | Oil Operator | Sep 2025 |
| 12 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 13 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Sep 2025 |
| 14 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 15 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 16 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Sep 2025 |
| 17 | Silver Mountain Energy LLC | | Gas Operator | Sep 2025 |
| 18 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Sep 2025 |
| 19 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 20 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 21 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 22 | Smith Energy LLC | | Oil & Gas Operator | Oct 2025 |
| 23 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 24 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 25 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 26 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 27 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 28 | St Croix Operating Inc | | Oil & Gas Operator | Sep 2025 |
| 29 | Standley* Robert K Dba Otis Energy | | Oil Operator | Jan 2023 |
| 30 | Starlight Resources LLC | | Oil & Gas Operator | Apr 2006 |
| 31 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 32 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 33 | Stoneham Production LLC | | Oil & Gas Operator | Sep 2025 |
| 34 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Aug 2025 |
| 35 | Summit Oil & Gas, LLC | | Oil & Gas Operator | Sep 2025 |
| 36 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Sep 2025 |
| 37 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 38 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 39 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 40 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Sep 2025 |