| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & R Operating | Merkel, TX 79536 | Oil & Gas Operator | Mar 2008 |
| 3 | Saber Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2008 |
| 4 | Sams Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1998 |
| 5 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 6 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 7 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 8 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 9 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 10 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 11 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 12 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 13 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 14 | SD Royale Energy, Inc. | San Diego, CA 92159 | Oil & Gas Operator | Oct 2025 |
| 15 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 16 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 17 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | Oct 2025 |
| 18 | Seven Falls Company | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 19 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 20 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Oct 2025 |
| 21 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 22 | Sharpe Energy Company | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 23 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 24 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 25 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Oct 2025 |
| 26 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Oct 2025 |
| 27 | Shinnery Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 28 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 29 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 30 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 31 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Oct 2025 |
| 32 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 33 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 34 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 35 | Sounion Petroleum Incorporated | Baltimore, MD 21218 | Oil & Gas Operator | Aug 1994 |
| 36 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 37 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Oct 2025 |
| 38 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 39 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 40 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 41 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 42 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 43 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Oct 2025 |
| 44 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 45 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 46 | Spheric Petroleum Inc. | Baltimore, MD 21208 | Oil & Gas Operator | Nov 2006 |
| 47 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 48 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 49 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 50 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 51 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 52 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 53 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 54 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Oct 2025 |
| 55 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 56 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 57 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Oct 2025 |
| 58 | Sundance Consulting Corp. | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 59 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 60 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 61 | Sutton Oil Co. | Austin, TX 78728 | Oil & Gas Operator | Oct 2025 |
| 62 | Swaringin, Howard Operating | Maryneal, TX 79535 | Oil & Gas Operator | May 2003 |
| 63 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 64 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |