| 27501 | Source Energy Midcon LLC | Highlands Ranch, CO 80129 | Oil Operator | Jul 2015 |
| 27502 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 27503 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Dec 2025 |
| 27504 | Sourcegas Energy Services Co | Golden, CO 80401 | Gas Operator | Jun 2015 |
| 27505 | Sours Thomas J | Sharon Center, OH 44274 | Oil & Gas Operator | Dec 2022 |
| 27506 | South Bay Oil Corporation | Wichita, KS 67202 | Oil Operator | Dec 2019 |
| 27507 | South Bay Resources, L.L.C. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 27508 | South Burbank Petroleum Corporation | Midland, TX 79707-9027 | Oil Operator | Feb 2010 |
| 27509 | South Carlton Operating Company, LLC | Natchez, MS 39121 | Oil Operator | Sep 2025 |
| 27510 | South Central Oil And Gas | | Oil & Gas Operator | Feb 2014 |
| 27511 | South Central Petroleum, Inc. | | Oil & Gas Operator | Dec 1988 |
| 27512 | South Central Texas Oil & Gas Co | Houston, TX 77060 | Oil & Gas Operator | Dec 2025 |
| 27513 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 27514 | South Coast Oil, Inc. | | Oil & Gas Operator | Jul 1989 |
| 27515 | South Florida Investment Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 1997 |
| 27516 | South Fork Energy, LLC - (Ca) | | Oil Operator | Dec 2021 |
| 27517 | South Fork Ranch | | Oil & Gas Operator | Feb 2013 |
| 27518 | South Forty Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 1993 |
| 27519 | South Forty Inc (The) | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 27520 | South Heart Company | | Oil Operator | Aug 2010 |
| 27521 | South Houston Production Company | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 27522 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 27523 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 27524 | South Loop Operating, L.C. | San Antonio, TX 78279 | Oil & Gas Operator | Apr 2009 |
| 27525 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 27526 | South Of Briles | | Oil Operator | Aug 1989 |
| 27527 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 27528 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Sep 2025 |
| 27529 | South Ranch Corporation | Midland, TX 79707 | Oil Operator | Sep 2019 |
| 27530 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 27531 | South Ranch Oil Company Inc | St. Louis, MO 63124 | Oil Operator | Sep 1996 |
| 27532 | South River Operating, LLC | | Oil & Gas Operator | Dec 2016 |
| 27533 | South Romeo Gas Storage Company LLC | | Gas Operator | Feb 1994 |
| 27534 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Dec 2025 |
| 27535 | South Sands Exploration LLC | Henryetta, OK 74437-4208 | Oil & Gas Operator | Aug 2025 |
| 27536 | South Shore Energy LLC | Geneva, OH 44041 | Oil & Gas Operator | Dec 2024 |
| 27537 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 27538 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 27539 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 27540 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 27541 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 27542 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 27543 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 27544 | Southampton Mineral Corp. | | Oil & Gas Operator | Aug 2005 |
| 27545 | Southbound Gas Company | Dallas, TX 75201 | Gas Operator | Oct 2025 |
| 27546 | Southbrook Energies Inc | Tulsa, OK 74153 | Oil Operator | Feb 2004 |
| 27547 | Southco Oil And Gas Inc. | | Oil & Gas Operator | Nov 2000 |
| 27548 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 27549 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 27550 | Southcreek Petroleum Co LLC | Blanchard, OK 73010-4911 | Oil & Gas Operator | Jul 2025 |
| 27551 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 27552 | Southeastern Gas Company | | Oil & Gas Operator | Dec 2019 |
| 27553 | Southeastern Oil & Gas Corp | | Oil Operator | Dec 2023 |
| 27554 | Southeastern Petroleum Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 27555 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 27556 | Southeastern Producing Co | | Oil Operator | Jul 1988 |
| 27557 | Southeastern Public Service Co | | Oil & Gas Operator | Sep 1982 |
| 27558 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 27559 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Aug 2025 |
| 27560 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Aug 2025 |
| 27561 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Aug 2025 |
| 27562 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 27563 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Dec 2025 |
| 27564 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 27565 | Southern California Gas Company | | Oil & Gas Operator | Sep 2025 |
| 27566 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 27567 | Southern Energy Operating Co Inc | | Oil Operator | Oct 2025 |
| 27568 | Southern Energy Operating, LLC | | Oil & Gas Operator | Sep 2025 |
| 27569 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 27570 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 27571 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 27572 | Southern Hills Gas Co. | | Oil Operator | May 2025 |
| 27573 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 27574 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 27575 | Southern Management Inc | Camargo, OK 73835 | Oil Operator | Jun 1992 |
| 27576 | Southern Management Services | | Oil Operator | May 2017 |
| 27577 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 27578 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 27579 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 27580 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 27581 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 27582 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Dec 2025 |
| 27583 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | Aug 2025 |
| 27584 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 27585 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 27586 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 27587 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 27588 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 27589 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Aug 2025 |
| 27590 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 27591 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 27592 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Sep 2025 |
| 27593 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 27594 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 27595 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | May 2025 |
| 27596 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 27597 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 27598 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 27599 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 27600 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |