| 27301 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 27302 | Semper Fidelis Oil & Gas, LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2013 |
| 27303 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Nov 2025 |
| 27304 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 27305 | Sendero Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 27306 | Seneca Energy Corporation | Dover, OH 44622 | Oil & Gas Operator | Dec 2020 |
| 27307 | Seneca Exploration, LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 27308 | Seneca Mineral Co Inc | Erie, PA 16509-4250 | Gas Operator | Dec 2002 |
| 27309 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 27310 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Dec 2025 |
| 27311 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 27312 | Seneca Stone Corporation | Seneca Falls, NY 13148 | Gas Operator | Dec 2024 |
| 27313 | Seneca Western Minerals Corp. | | Oil & Gas Operator | Dec 2009 |
| 27314 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 27315 | Seneca-Upshur Petroleum, LLC | Denver, CO 80203 | Gas Operator | Dec 2015 |
| 27316 | Senico Production Company | Irving, TX 75016-5229 | Oil & Gas Operator | Mar 2002 |
| 27317 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 27318 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 27319 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 27320 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Feb 2026 |
| 27321 | Senske, Richard S. | Ashville, NY 14710 | Gas Operator | Dec 2024 |
| 27322 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 27323 | Sentinel Peak Resources California LLC | | Oil & Gas Operator | Dec 2025 |
| 27324 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 27325 | Sentry Exploration, Inc. | Houston, TX 77006 | Oil & Gas Operator | Feb 2026 |
| 27326 | Sep Cisco Dome II, LLC | Orem, UT 84097 | Oil & Gas Operator | Nov 2025 |
| 27327 | Sep Cisco Dome LLC | Orem, UT 84097 | Oil & Gas Operator | Mar 2015 |
| 27328 | Sep Nosr LLC | Orem, UT 84097 | Oil & Gas Operator | Nov 2025 |
| 27329 | Sep, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1994 |
| 27330 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2025 |
| 27331 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 27332 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 27333 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 27334 | Sequoia Exploration Inc. | | Oil & Gas Operator | Nov 2025 |
| 27335 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 27336 | Sequoia Management, LLC | Houston, TX 77060 | Oil & Gas Operator | Nov 2009 |
| 27337 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 27338 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 27339 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | Feb 2026 |
| 27340 | Serco Operating LLC | Katy, TX 77450 | Oil Operator | Feb 2026 |
| 27341 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 27342 | Serendipity Operating LLC | Sparks, NV 89436-9328 | Oil & Gas Operator | Nov 2025 |
| 27343 | Serendipity Production Company LC | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2020 |
| 27344 | Sergeant Gas Co Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2024 |
| 27345 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 27346 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 27347 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 27348 | Serio Operating Co. | | Oil & Gas Operator | Mar 2007 |
| 27349 | Serio-Punches Oil Co | | Oil Operator | Jan 2008 |
| 27350 | Serna Inc. | Austin, TX 78733 | Oil Operator | Feb 2026 |
| 27351 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 27352 | Servco Productio | | Oil Operator | Dec 1992 |
| 27353 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Feb 2026 |
| 27354 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 27355 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 27356 | Service Production Company, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | May 1999 |
| 27357 | Ses Oil | | Oil Operator | Jun 2004 |
| 27358 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 27359 | Sescil, Douglas W. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 27360 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 27361 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 27362 | Setex Oil Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jan 2000 |
| 27363 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 27364 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 27365 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 27366 | Sev Texas Operating, LLC | Long Beach, CA 90755 | Oil & Gas Operator | Feb 2026 |
| 27367 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 27368 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |
| 27369 | Seven Falls Company | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 27370 | Seven Horses LLC | Alva, OK 73717-5004 | Oil & Gas Operator | Dec 2025 |
| 27371 | Seven J Oil Inc | Jenning, OK 74038-9729 | Oil & Gas Operator | Nov 2025 |
| 27372 | Seven Lakes Operating LLC | Austin, TX 78746 | Oil Operator | Feb 2026 |
| 27373 | Seven Sisters Oil & Gas LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2022 |
| 27374 | Seven To One Oil & Gas LLC | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2024 |
| 27375 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 27376 | Sevenbar Resources, LLC | Hallettsville, TX 77964 | Oil & Gas Operator | Feb 2026 |
| 27377 | Seventh Corporation The | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2006 |
| 27378 | Seventy Oil Co. | Freer, TX 78357 | Oil & Gas Operator | Mar 2002 |
| 27379 | Sevenx, LLC | Iowa Park, TX 76367 | Oil Operator | Feb 2026 |
| 27380 | Severtson, James C. | Allegany, NY 14706 | Oil & Gas Operator | Dec 2024 |
| 27381 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 27382 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 27383 | Sexton Oil Company | Camden, AR 71701 | Oil Operator | Jan 2025 |
| 27384 | Seydell, E. Morris | Wichita Falls, TX 76307 | Oil Operator | Feb 1993 |
| 27385 | Seymour Oil Co Inc | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 27386 | Seymour, James & Lorraine | Cut Bank, MT 59427 | Oil Operator | Jul 2022 |
| 27387 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 27388 | SFJV Enterprises, Inc. | Berclair, TX 78107 | Gas Operator | Aug 1998 |
| 27389 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 27390 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | Dec 2025 |
| 27391 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 27392 | SGB Oil LLC | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 27393 | SGP Operating LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 27394 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Sep 2025 |
| 27395 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 27396 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 27397 | Shack, Bill | Albany, TX 76430 | Oil & Gas Operator | Apr 2006 |
| 27398 | Shackelford Oil Co | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 27399 | Shackelford,Frank Oil Properties | Midland, TX 79701 | Oil & Gas Operator | Aug 1997 |
| 27400 | Shadawn Corporation | Wichita Falls, TX 76310 | Oil & Gas Operator | Mar 2005 |