| 17101 | Lee'S Summit Gas Co. | | Gas Operator | Dec 1933 |
| 17102 | Lee, R.A., Inc. | | Oil Operator | Nov 1972 |
| 17103 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Oct 2025 |
| 17104 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 17105 | Leedy Oil Produc | | Oil & Gas Operator | Dec 1995 |
| 17106 | Leedy Oil Producers | | Oil Operator | Nov 2009 |
| 17107 | Leejan Oil Company | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 17108 | Leeman Don J | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1998 |
| 17109 | Leeman Energy Co | | Oil & Gas Operator | Jan 1987 |
| 17110 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 17111 | Leeper Oil Exp. & Prod. Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 17112 | Lees Petroleum LLC | | Oil & Gas Operator | Jul 2000 |
| 17113 | Leeward Operators LLC | | Oil & Gas Operator | Jul 2011 |
| 17114 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 17115 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | Dec 2025 |
| 17116 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 17117 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Oct 2025 |
| 17118 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 17119 | Lefforge & Klein | Amarillo, TX 79114 | Gas Operator | Jun 1997 |
| 17120 | Left Behind Recovery, LLC | Luling, TX 78648 | Oil & Gas Operator | Dec 2025 |
| 17121 | Left-Hand Ranch, LLC | Helotes, TX 78023 | Oil Operator | Dec 2025 |
| 17122 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Oct 2025 |
| 17123 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 17124 | Legacy Acres, LLC | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 17125 | Legacy Corporation, The | Cedar Park, TX 78613 | Oil & Gas Operator | Jun 2004 |
| 17126 | Legacy Energy Inc | Carpinteria, CA 93013 | Oil & Gas Operator | Jun 2012 |
| 17127 | Legacy Energy Services | Jourdanton, TX 78026 | Oil Operator | Dec 2025 |
| 17128 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Nov 2025 |
| 17129 | Legacy Energy, LLC | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 17130 | Legacy Exploration, LLC I | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 17131 | Legacy Ogc LLC | Erie, PA 16509 | Oil & Gas Operator | Dec 2024 |
| 17132 | Legacy Oil & Gas ND, Inc. | | Oil & Gas Operator | Feb 2016 |
| 17133 | Legacy Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Dec 2025 |
| 17134 | Legacy Oil, LLC | Falls Of Rough, KY 40119 | Oil Operator | Dec 2023 |
| 17135 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | Oct 2025 |
| 17136 | Legacy Operating Company | | Oil & Gas Operator | Aug 1992 |
| 17137 | Legacy Operating Company, LLC | Dallas, TX 75205 | Oil Operator | Jun 2024 |
| 17138 | Legacy Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 2019 |
| 17139 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 17140 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 17141 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 17142 | Legado DJ, LLC | | Oil & Gas Operator | Jul 2011 |
| 17143 | Legado Gulf Coast, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2010 |
| 17144 | Legado Midcon LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 17145 | Legado Permian, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2013 |
| 17146 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 17147 | Legend Energy LLC | Cherryvale, KS 67335 | Oil Operator | Aug 2025 |
| 17148 | Legend Energy Texas, LLC | Arlington, TX 76002 | Oil & Gas Operator | Dec 2025 |
| 17149 | Legend Fund, LLC | | Oil & Gas Operator | Jan 2025 |
| 17150 | Legend Natural Gas II, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 17151 | Legend Natural Gas III, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 17152 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 17153 | Legend Natural Gas, LP | Houston, TX 77084 | Oil & Gas Operator | Aug 2004 |
| 17154 | Legend Oil & Gas LTD. | Alpharetta, GA 30022 | Oil Operator | Mar 2015 |
| 17155 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 17156 | Legendary Oil Co., Inc. | | Oil Operator | Feb 2004 |
| 17157 | Legendary Well Service, Inc. | | Oil Operator | Jan 1996 |
| 17158 | Leger Production Company, Inc. | | Oil & Gas Operator | Apr 1984 |
| 17159 | Legg, Raymond | | Oil Operator | Dec 2010 |
| 17160 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 17161 | Leggett Petroleum, L.L.C. | | Oil & Gas Operator | Dec 2020 |
| 17162 | Legleiter, Julius A. | Hays, KS 67601 | Oil Operator | Apr 1996 |
| 17163 | Legrand, Buck | Sedan, KS 67361 | Oil Operator | Jun 1994 |
| 17164 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 17165 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 17166 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 17167 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 17168 | Leighty, Roger Operator | Lawrenceville, IL 62439 | Oil & Gas Operator | Oct 1997 |
| 17169 | Leiker, Edward P. | Hays, KS 67601 | Oil Operator | Apr 1992 |
| 17170 | Leis Oil Services, LLC | Yates Center, KS 66783 | Oil Operator | Jul 2023 |
| 17171 | Leis, John E. | Yates Center, KS 66783 | Oil Operator | Sep 2025 |
| 17172 | Leis, Ryan M. | Scottsdale, AZ 85258 | Oil & Gas Operator | Dec 2009 |
| 17173 | Leis, Steven A. | Yates Center, KS 66783 | Oil Operator | Aug 2025 |
| 17174 | Leis, VIctor J. | Paola, KS 66071 | Oil & Gas Operator | Sep 2025 |
| 17175 | Leith Operations | | Oil Operator | Jul 1989 |
| 17176 | Lejan, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 17177 | Lekan James V | Ashland, OH 44805 | Oil & Gas Operator | Dec 1997 |
| 17178 | Leland Oil & Gas, LLC | | Oil & Gas Operator | Nov 2025 |
| 17179 | Leland Petroleum Production Inc | | Oil & Gas Operator | Dec 2007 |
| 17180 | Lem Operating Co., Inc. | Colorado City, TX 79512 | Oil & Gas Operator | Nov 2012 |
| 17181 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Nov 2025 |
| 17182 | Lemay Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Jun 2002 |
| 17183 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Aug 2025 |
| 17184 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Dec 2025 |
| 17185 | Lenape Resources Corp | | Oil & Gas Operator | Dec 2000 |
| 17186 | Lenape Resources LLC | | Oil & Gas Operator | Dec 2024 |
| 17187 | Lendrum Energy LLC | Cranberry, PA 16319-4009 | Oil & Gas Operator | Dec 2023 |
| 17188 | Lenert & Pettitt, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 1994 |
| 17189 | Lengacher William P | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 17190 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 17191 | Lennon Oil Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2008 |
| 17192 | Leo Michaelis Oil Operator | | Oil Operator | Oct 2002 |
| 17193 | Leo Vesenmeir, Jr. | | Oil & Gas Operator | Jul 1987 |
| 17194 | Leo Windham | | Oil Operator | Jul 1992 |
| 17195 | Leon J. Sabean | | Oil & Gas Operator | Dec 2018 |
| 17196 | Leonard 1&2 LLC | | Oil Operator | Oct 2025 |
| 17197 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 17198 | Leonard Vann | | Oil Operator | Oct 2025 |
| 17199 | Leonard, Daniel M. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2001 |
| 17200 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |