| 27201 | Seaward Resources Inc. | | Gas Operator | Dec 1984 |
| 27202 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 27203 | Seay Dennis Regan | | Oil Operator | Jan 2001 |
| 27204 | Seay Exploration, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 27205 | Seay Oil & Gas, LTD. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Apr 2013 |
| 27206 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Nov 2025 |
| 27207 | Secan Oil Co Inc | | Oil & Gas Operator | May 1987 |
| 27208 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 27209 | Seco Petroleum Corp | Houston, TX 77290 | Oil & Gas Operator | Jan 1997 |
| 27210 | Seco Production Company | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |
| 27211 | Second Oil LTD | McCdlue, OH 43534 | Oil & Gas Operator | Dec 2024 |
| 27212 | Second Wind Production Company Inc. | | Oil Operator | Dec 2013 |
| 27213 | Secondary Gas Recovery Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1993 |
| 27214 | Secondary Oil Corp., Inc. | Austin, TX 78750 | Oil Operator | Apr 1999 |
| 27215 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 27216 | Secure Exploration And Production, LLC | | Oil Operator | Aug 2025 |
| 27217 | Security Pacific National Bank | | Oil Operator | Dec 1990 |
| 27218 | Sed Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 27219 | Sedalia Energy, LLC | | Oil & Gas Operator | Mar 2018 |
| 27220 | Sedco Resources Inc | Kerrville, TX 78029 | Oil & Gas Operator | Feb 2026 |
| 27221 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 27222 | Sedona Oil & Gas Corporation | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 27223 | See Oil | | Oil Operator | Sep 2025 |
| 27224 | Seeco | | Gas Operator | Mar 2016 |
| 27225 | Seeco, Inc. | | Gas Operator | Mar 2015 |
| 27226 | Seed Group/Aa Drilling | | Oil Operator | Oct 2009 |
| 27227 | Seedy Draw LLC | Greenwood VIllage, CO 80111 | Oil Operator | Oct 2025 |
| 27228 | Seek Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 27229 | Seeker Oil Company II, Inc. | San Antonio, TX 78209 | Oil Operator | Jan 2016 |
| 27230 | Seeker Oil Company, Incorporated | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 27231 | Seeker, LLC | Newkirk, OK 74647 | Oil & Gas Operator | Nov 2019 |
| 27232 | Seel-Mac Oil & Gas LLC | Richardson, TX 75080 | Oil Operator | Jul 2011 |
| 27233 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Dec 2025 |
| 27234 | Seelig Oil Corpo | | Oil Operator | Apr 1985 |
| 27235 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 27236 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 27237 | Seer Operating LLC | Sheridan, WY 82801 | Oil & Gas Operator | Oct 2016 |
| 27238 | Seewald, Hughes | Amarillo, TX 79105 | Gas Operator | Jan 1997 |
| 27239 | Segars Energy | | Gas Operator | Mar 2001 |
| 27240 | Segars Operating | | Gas Operator | Apr 2014 |
| 27241 | Segler, Charles | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 27242 | Sego Resources Corp | Denver, CO 80293-0621 | Oil & Gas Operator | Dec 1999 |
| 27243 | Segrest-Ward Joint Venture | Longview, TX 75606 | Oil & Gas Operator | Jun 2001 |
| 27244 | Seguin Pump | Seguin, TX 78155 | Oil & Gas Operator | Sep 2017 |
| 27245 | Seguro Oil & Gas Inc | | Oil Operator | Jul 1992 |
| 27246 | Seguro Oil And Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2024 |
| 27247 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Feb 2026 |
| 27248 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Feb 2026 |
| 27249 | Seibel Modern MFG. & Welding Corp. | Lancaster, NY 14086 | Gas Operator | Dec 2024 |
| 27250 | Seibert Darrel L/Chestnut | Cuyahoga Falls, OH 44224 | Oil & Gas Operator | Dec 1994 |
| 27251 | Seibert Oil & Gas | Hudson, OH 44236-4430 | Oil & Gas Operator | Dec 1999 |
| 27252 | Seibert Oil, LLC | Macksville, KS 67557 | Oil & Gas Operator | Jul 2025 |
| 27253 | Seidler Oil & Gas Operating, LLC | Alvarado, TX 76009 | Oil & Gas Operator | Feb 2026 |
| 27254 | Seifert Companies LTD | Bremen, OH 43107 | Oil & Gas Operator | Dec 2023 |
| 27255 | Seifert, Timothy M. | Caledonia, NY 14423 | Gas Operator | Dec 2024 |
| 27256 | Seiguf Oil Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 27257 | Seiran E & P Company, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Feb 2026 |
| 27258 | Seisgen Exploration, Inc | Houston, TX 77024 | Gas Operator | Aug 2005 |
| 27259 | Seisma Drilling Corporation | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 27260 | Seismic Investment Group, Inc. | Houston, TX 77055 | Oil & Gas Operator | Jun 2008 |
| 27261 | Seismic Leasing Service | Denver, CO 80216 | Oil & Gas Operator | Aug 2000 |
| 27262 | Seismotech Energy, Incorporated | Plano, TX 75075 | Oil & Gas Operator | Aug 2003 |
| 27263 | Seistech Development, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2007 |
| 27264 | Seitz Farms, Inc. | Phelps, NY 14532 | Gas Operator | Dec 2024 |
| 27265 | Seitz, Comegys & Seitz | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1994 |
| 27266 | Seitz, J. R. & Adam | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 27267 | Seitz, J. R. & Adam, LTD. | Wichita Falls, TX 76307 | Oil Operator | Feb 2026 |
| 27268 | Sek Energy, LLC | Benedict, KS 66714 | Oil & Gas Operator | Sep 2025 |
| 27269 | Sek Oil Incorpor | | Oil Operator | Jun 1985 |
| 27270 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 27271 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | Dec 2025 |
| 27272 | Select Energy Investments Inc | Solon, OH 44139 | Oil & Gas Operator | Dec 2019 |
| 27273 | Select Exploration Group LLC | Eufaula, OK 74432 | Oil & Gas Operator | May 2024 |
| 27274 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 27275 | Select Water Solutions, LLC | Gainesville, TX 76240 | Oil Operator | Nov 2025 |
| 27276 | Self Brothers | Montague, TX 76251 | Oil & Gas Operator | Feb 2026 |
| 27277 | Self, Charles D. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2016 |
| 27278 | Self, Charles Lynn | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 27279 | Sell Drilling LLC | | Oil Operator | Feb 2011 |
| 27280 | Sell Well Servicing Company Osage Only | | Oil & Gas Operator | Nov 2019 |
| 27281 | Sell, David E | | Oil Operator | Nov 2025 |
| 27282 | Sellers Donald J | Depew, OK 74028-2442 | Oil Operator | Jan 2013 |
| 27283 | Sellers Jack B Estate Of | Cleveland, OK 74020 | Oil & Gas Operator | Nov 2025 |
| 27284 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Feb 2026 |
| 27285 | Sellers Mark A | Drumright, OK 74030 | Oil & Gas Operator | Mar 2020 |
| 27286 | Sellers O N | Henryetta, OK 74437 | Oil & Gas Operator | May 1997 |
| 27287 | Sellers&Fulton Oil LLC | Artesia, NM 88210 | Oil & Gas Operator | Jun 2021 |
| 27288 | Sellers' Lease Service | Flatonia, TX 78941 | Oil & Gas Operator | Jul 1994 |
| 27289 | Sellmeyer Eugene | Collinsville, OK 74021 | Oil & Gas Operator | Mar 2015 |
| 27290 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 27291 | Selous Energy, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2015 |
| 27292 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 27293 | Semac Ind Inc | Spartansburg, PA 16434-1627 | Gas Operator | Dec 2015 |
| 27294 | Semgas Gathering LLC | Tulsa, OK 74136 | Gas Operator | Jul 2009 |
| 27295 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 27296 | Seminole Oil & Gas Co Inc | Seminole, OK 74868 | Gas Operator | May 2004 |
| 27297 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 27298 | Seminole Production Co. | Silsbee, TX 77656 | Oil & Gas Operator | Oct 2002 |
| 27299 | Seminole Senora Sand Unit #1, LLC | Rogers, AR 72758 | Gas Operator | Sep 2010 |
| 27300 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Nov 2025 |