| 1 | S. Lavon Evans Jr Inc, Et Al | | Oil & Gas Operator | Jan 2010 |
| 2 | S. Lavon Evans, Jr. Operating Co., Inc. | | Oil & Gas Operator | Aug 2014 |
| 3 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 4 | Samedan Energy Development Cor | | Oil & Gas Operator | Feb 1987 |
| 5 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 6 | Santa Fe Energy Op Partners LP | | Oil & Gas Operator | Oct 1989 |
| 7 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 8 | Savannah Joint Ventures | | Oil & Gas Operator | Nov 2000 |
| 9 | Savannah Oil And Gas, L. L. C. | | Oil & Gas Operator | Oct 1998 |
| 10 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 11 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 12 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 13 | Secan Oil Co., Inc. | | Oil & Gas Operator | May 1987 |
| 14 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 15 | Serio Operating Company | | Oil & Gas Operator | Mar 2007 |
| 16 | Serio-Punches Oil Co | | Oil Operator | Jan 2008 |
| 17 | Shell Oil Co. -Nola | | Oil & Gas Operator | Jun 2000 |
| 18 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 19 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 20 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Jun 2025 |
| 21 | Shield Resources Inc | | Oil & Gas Operator | Nov 1987 |
| 22 | Sidney E. Pinkston, Jr, Trustee | | Oil & Gas Operator | Apr 1980 |
| 23 | Signal, LLC | | Oil & Gas Operator | Mar 2025 |
| 24 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 25 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2025 |
| 26 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 27 | Skye MS, LLC | | Oil & Gas Operator | Mar 2025 |
| 28 | Slik-Dril P & A Inc | | Oil & Gas Operator | Sep 1989 |
| 29 | Slik-Dril, Inc | | Oil & Gas Operator | Nov 1998 |
| 30 | Smith Operating & Management Co. | Shreveport, LA 71161 | Oil & Gas Operator | Feb 2005 |
| 31 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 32 | Smith, Clyde H. Oper. Co., Inc. | | Oil & Gas Operator | Jun 1994 |
| 33 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 34 | Sooner Corporation | | Oil & Gas Operator | Oct 1990 |
| 35 | Southeastern Producing Co | | Oil Operator | Jul 1988 |
| 36 | Southern Energy Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 37 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 38 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 39 | Southwest Mississippi Oil & Gas, LLC. | | Oil Operator | Mar 2025 |
| 40 | Spooner Petroleum Company | | Oil & Gas Operator | Feb 2025 |
| 41 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 42 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 43 | Standard Operating Inc | | Oil Operator | Jun 1986 |
| 44 | Starr Operating Company | Austin, TX 78759 | Oil & Gas Operator | Jun 2025 |
| 45 | State Line Exploration, LLC | | Oil & Gas Operator | Feb 2025 |
| 46 | Stinson, Jan | | Oil Operator | May 1984 |
| 47 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 48 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Jun 2025 |
| 49 | Streetman Inc | | Oil Operator | Oct 1987 |
| 50 | Strong Rock Operating Company, LLC | | Oil & Gas Operator | Mar 2025 |
| 51 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Jun 2025 |
| 52 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 53 | Sun Oil Company | Arlington, TX 76006 | Oil & Gas Operator | Dec 2021 |
| 54 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Jun 2025 |
| 55 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 56 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 57 | Swampfox Oilfield Services, LLC | | Oil & Gas Operator | Dec 2024 |
| 58 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |