| 28001 | Swan PC, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2026 |
| 28002 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 28003 | Swan Richard N | Claremore, OK 74018-0503 | Oil Operator | Aug 2013 |
| 28004 | Swander, Everett | Cunningham, KS 67035 | Oil Operator | May 1998 |
| 28005 | Swanhart Angelo & Deborah | Indiana, PA 15701-6301 | Gas Operator | Dec 2025 |
| 28006 | Swanner Properties | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2026 |
| 28007 | Swanson & Vestal | Electra, TX 76360 | Oil & Gas Operator | Oct 1997 |
| 28008 | Swanson Douglas L & Sharon | Bartlesville, OK 74003-9319 | Oil Operator | Apr 2026 |
| 28009 | Swanson G T | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 28010 | Swanson Oil & Gas LLC | Williston, ND 58802 | Oil & Gas Operator | May 2026 |
| 28011 | Swanson Operating, Inc. | Holliday, TX 76366 | Oil Operator | Jul 2026 |
| 28012 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 28013 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 28014 | Swaringin, Howard Operating | Maryneal, TX 79535 | Oil & Gas Operator | May 2003 |
| 28015 | Swartout, John D & Sandra | Sherman, NY 14781 | Gas Operator | Dec 2025 |
| 28016 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2026 |
| 28017 | Swartz, Guy A. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 1993 |
| 28018 | SWD Acidizing, Inc. | | Oil Operator | Feb 2014 |
| 28019 | SWD, Inc. | | Oil Operator | Jan 2025 |
| 28020 | Swearingen Robert E Dba Sabo Production | Seminole, OK 74868 | Oil & Gas Operator | Apr 2026 |
| 28021 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Jul 2026 |
| 28022 | Sweet Texas T Energy LLC | Clyde, TX 79510 | Oil Operator | Jul 2026 |
| 28023 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2026 |
| 28024 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Apr 2026 |
| 28025 | Sweetwater Production, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jul 2026 |
| 28026 | Swenco-Western I | | Oil Operator | Sep 1987 |
| 28027 | Swenco-Western Inc | Houston, TX 77060 | Oil & Gas Operator | Jan 1997 |
| 28028 | Swenson Backhoe Service, Inc. | Electra, TX 76360 | Oil Operator | Jul 2026 |
| 28029 | Swenson, Clifford E. | Henrietta, TX 76365 | Oil & Gas Operator | Jul 2026 |
| 28030 | Swenton Michael J | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2026 |
| 28031 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 28032 | Swepi LP And Miller Brothers | | Oil & Gas Operator | Oct 1992 |
| 28033 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 28034 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 28035 | Swiess & Thomas | San Antonio, TX 78247 | Oil Operator | Jul 2026 |
| 28036 | Swift A W & Company Inc | Sand Springs, OK 74063-5124 | Oil Operator | Jun 2003 |
| 28037 | Swift Energy Com | | Oil & Gas Operator | Sep 1995 |
| 28038 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 28039 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 28040 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 28041 | Swingle Drilling Inc | Crooksville, OH 43731 | Oil & Gas Operator | Dec 2025 |
| 28042 | Swinkwood Oil Co | | Oil Operator | Apr 2015 |
| 28043 | Switchgrass E&P Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 28044 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | Jul 2026 |
| 28045 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 28046 | SWN Production (Ohio), LLC | Spring, TX 77389 | Oil & Gas Operator | Mar 2024 |
| 28047 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Dec 2025 |
| 28048 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 28049 | Swo & Ism, LLC | | Oil & Gas Operator | Dec 2021 |
| 28050 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Jul 2026 |
| 28051 | Swordfish Energy Operating, LLC | Houston, TX 77060 | Oil & Gas Operator | Jul 2026 |
| 28052 | SWS | Humble, TX 77338 | Oil Operator | Jul 2026 |
| 28053 | SWS Operating LLC | Lawton, OK 73501-3236 | Oil Operator | Sep 2024 |
| 28054 | SWV Energy Operating LLC | Spring, TX 77379 | Gas Operator | Dec 2018 |
| 28055 | SX54, LLC | Sheridan, WY 82801 | Oil Operator | Nov 2017 |
| 28056 | Sycamore Development Partners LLC | | Oil & Gas Operator | May 2026 |
| 28057 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Jul 2026 |
| 28058 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 28059 | Sydson Energy, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jul 2026 |
| 28060 | Syj Oil & Gas | San Antonio, TX 78209 | Oil Operator | Sep 2000 |
| 28061 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2026 |
| 28062 | Sylvan Energy, LLC | Pittsburgh, PA 15211 | Oil & Gas Operator | Jul 2026 |
| 28063 | Sylvan Oil Operating Company | Tulsa, OK 74103-3516 | Oil & Gas Operator | Apr 2016 |
| 28064 | Sylvite Corp | Tulsa, OK 741363908 | Oil & Gas Operator | Dec 2000 |
| 28065 | Symank, Steve | Olney, TX 76374 | Oil & Gas Operator | Jul 2026 |
| 28066 | Symba American Oil, Inc | Houston, TX 77056 | Oil Operator | Jul 2026 |
| 28067 | Synd Enterprises Inc | Lakewood, NY 14750-9613 | Oil & Gas Operator | Dec 2006 |
| 28068 | Syndex Resources, Inc. | Wellesley, MA 02181-000 | Oil & Gas Operator | Dec 2021 |
| 28069 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2026 |
| 28070 | Synergy Development Corp | | Oil Operator | Apr 2011 |
| 28071 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 28072 | Synergy Oil & Gas LLC | | Oil & Gas Operator | Feb 2026 |
| 28073 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 28074 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 28075 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 28076 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 28077 | Synergy Operating LLC | Farmington, NM 87499 | Oil & Gas Operator | Nov 2025 |
| 28078 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 28079 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |
| 28080 | Syntax Energy Corporation | Denton, TX 76210 | Oil Operator | Jul 2026 |
| 28081 | Synthetic Energy Corporation | Houston, TX 77006 | Oil Operator | Jul 2026 |
| 28082 | Szumigala, Edward R. & Ruth A. | Dunkirk, NY 14048 | Gas Operator | Dec 2025 |
| 28083 | T & A Resources LLC | Salyersville, KY 41465 | Oil Operator | Dec 2023 |
| 28084 | T & B Drilling, Inc | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 28085 | T & B Oil Company Inc | Ardmore, OK 73401-3709 | Oil & Gas Operator | Apr 2015 |
| 28086 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 28087 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 28088 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 28089 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2026 |
| 28090 | T & D Oil Co. | Victoria, KS 67671 | Oil Operator | Apr 1996 |
| 28091 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 28092 | T & D Oil LLC (Osage Only) | | Oil & Gas Operator | Apr 2026 |
| 28093 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 28094 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 28095 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 28096 | T & G Energy LLC | Dallas, TX 75230 | Oil Operator | Nov 2010 |
| 28097 | T & G Holding LLC | Pauls Valley, OK 73075-8663 | Oil & Gas Operator | Mar 2015 |
| 28098 | T & G Oil Operations LLC | | Oil Operator | Mar 2026 |
| 28099 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 28100 | T & I Petroleum Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2005 |