| 1 | S & D LLC | | Oil & Gas Operator | Aug 2022 |
| 2 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Jun 2018 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Samson Oil Company | | Oil & Gas Operator | Feb 2001 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 6 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Jun 2025 |
| 7 | Sand Hills Society | | Gas Operator | Oct 2009 |
| 8 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Aug 2025 |
| 9 | Sandridge Energy Inc (Federal Wells Only) | | Oil & Gas Operator | Jun 2013 |
| 10 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 11 | Sawtooth Energy Partners LLC | | Oil & Gas Operator | Nov 2005 |
| 12 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Oct 2025 |
| 13 | Schneider Energy Services Inc | | Oil & Gas Operator | Jul 2025 |
| 14 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 15 | Schuh And Associates | | Gas Operator | Feb 2000 |
| 16 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 17 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Jul 2025 |
| 18 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 19 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | Aug 2025 |
| 20 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Aug 2025 |
| 21 | Shepler & Thomas, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 22 | Silver Mountain Energy LLC | | Oil & Gas Operator | May 2025 |
| 23 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Jul 2025 |
| 24 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 25 | Singletree Resources Inc | | Oil & Gas Operator | Aug 2014 |
| 26 | Skaer Properties LTD Partnership | | Oil & Gas Operator | Jun 2013 |
| 27 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 28 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 29 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 30 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 31 | Smith Energy Limited Partnership 1988 | | Oil & Gas Operator | May 2012 |
| 32 | Smith Energy LLC | | Oil & Gas Operator | Jul 2025 |
| 33 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 34 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 35 | Sonat Raton, L.L.C. | | Gas Operator | Sep 2005 |
| 36 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 37 | Soper Production | | Oil & Gas Operator | Dec 2011 |
| 38 | Sourcegas Energy Services Co | Golden, CO 80401 | Gas Operator | Jun 2015 |
| 39 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 40 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Aug 2025 |
| 41 | Sovereign Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 42 | Sovereign Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 43 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 44 | St Croix Operating Inc | | Oil Operator | Jul 2025 |
| 45 | St James Energy Operating Inc | | Oil & Gas Operator | Aug 2013 |
| 46 | Standley* Robert K Dba Otis Energy | | Oil Operator | Jan 2023 |
| 47 | Starlight Resources LLC | | Oil & Gas Operator | Jun 2006 |
| 48 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 49 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 50 | Stephens Energy Company LLC | | Oil & Gas Operator | Jun 2012 |
| 51 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 52 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 53 | Stoneham Production LLC | | Oil & Gas Operator | Jul 2025 |
| 54 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Jul 2025 |
| 55 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 56 | Summit Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 57 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Aug 2025 |
| 58 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2025 |
| 59 | Sundance Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2014 |
| 60 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 61 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 62 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 63 | Swift Beef Company | | Oil & Gas Operator | May 2006 |
| 64 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Jul 2025 |
| 65 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Jul 2024 |
| 66 | Synergy Resources Corporation | | Oil & Gas Operator | Oct 2022 |