| 101 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Feb 2025 |
| 102 | Lawrence Hot Oil Service | Loco, OK 73442 | Oil & Gas Operator | Mar 2025 |
| 103 | Lawrence James LLC | Guthrie, OK 73044-9622 | Oil & Gas Operator | Feb 2025 |
| 104 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 105 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 106 | Lawrence, C. F. & Assoc. Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Jun 2025 |
| 107 | Lawson George E | Sand Springs, OK 74063 | Oil & Gas Operator | May 2013 |
| 108 | Layco Oil | Okmulgee, OK 74447-2065 | Oil & Gas Operator | Apr 2020 |
| 109 | Layton Oil Co. | | Oil Operator | Feb 1994 |
| 110 | Lazy H Investment | Chandler, OK 74834 | Oil & Gas Operator | Nov 1993 |
| 111 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 112 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Mar 2025 |
| 113 | Ldo LLC | Skiatook, OK 74070 | Oil Operator | Mar 2025 |
| 114 | Le Bas Operating Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2000 |
| 115 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 116 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 117 | Leake Keith D | Winfield, KS 67156-8871 | Oil Operator | Apr 2004 |
| 118 | Leaman Oil Company | Roland, OK 74954 | Oil & Gas Operator | Apr 2014 |
| 119 | Lear Petroleum Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2015 |
| 120 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 121 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 122 | Leatherneck Energy Group Inc | Addison, TX 75001-6025 | Oil & Gas Operator | Apr 2020 |
| 123 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 124 | Ledford Jan Oil & Gas | Duncan, OK 73533-3210 | Oil Operator | Dec 2024 |
| 125 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 126 | Lee Energy LLC | Edmond, OK 73034-7668 | Oil Operator | Jan 2005 |
| 127 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 128 | Lee Of Tulsa Oil & Gas Inc | Tulsa, OK 74114-5634 | Oil & Gas Operator | Dec 2021 |
| 129 | Lee Ron | Emory, TX 75440 | Oil Operator | Feb 2025 |
| 130 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Feb 2025 |
| 131 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 132 | Leeman Don J | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1998 |
| 133 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 134 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Feb 2025 |
| 135 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Feb 2025 |
| 136 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 137 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Mar 2025 |
| 138 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | Feb 2025 |
| 139 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2023 |
| 140 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 141 | Legado Midcon, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 142 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 143 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 144 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2025 |
| 145 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Jan 2025 |
| 146 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 147 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jun 2025 |
| 148 | Leonard Vann | | Oil Operator | Feb 2025 |
| 149 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 150 | Lester Joan | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2025 |
| 151 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 152 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 153 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 154 | Lewis A Hembree Production Co | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 155 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Feb 2025 |
| 156 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 157 | Lewis James D Oil Company | Healdton, OK 73438 | Oil Operator | Jan 2025 |
| 158 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 159 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2023 |
| 160 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2025 |
| 161 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Feb 2025 |
| 162 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Jun 2025 |
| 163 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 164 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 165 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 166 | Lightner Harry A | | Oil & Gas Operator | May 2013 |
| 167 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 168 | Lil Dab Petroleum Inc | Ringling, OK 73456 | Oil Operator | Feb 2025 |
| 169 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 170 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 171 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 172 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 173 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 174 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 175 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 176 | Limestone Productions | Bartlesville, OK 74006-8229 | Oil & Gas Operator | Sep 2013 |
| 177 | Linam Harry Dba Sooner State Production | Marlow, OK 73055-0583 | Oil & Gas Operator | Apr 2015 |
| 178 | Linam Richard Dwayne | Marlow, OK 73055-8658 | Oil Operator | Nov 2024 |
| 179 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 180 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 181 | Lincoln Tank Truck Service Inc | Stroud, OK 74079-0662 | Oil & Gas Operator | May 2013 |
| 182 | Lincoln Ventures LLC | Inola, OK 74036-5035 | Oil & Gas Operator | Feb 2025 |
| 183 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 184 | Link Oil Company (The) | Tulsa, OK 74103-4113 | Oil & Gas Operator | Jan 2014 |
| 185 | Linn Mid-Continent Operating Inc | Houston, TX 77002-3018 | Oil & Gas Operator | Jun 2016 |
| 186 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 187 | Liston V Dean | Nowata, OK 74048-5200 | Oil & Gas Operator | Nov 2016 |
| 188 | Litsey Exploration LLC | | Oil & Gas Operator | Feb 2025 |
| 189 | Little Bear Oil & Gas Co LTD | Boca Rotan, FL 33431 | Oil & Gas Operator | Jan 1997 |
| 190 | Little Bear Resources LLC | Stillwater, OK 74074-1388 | Oil & Gas Operator | Feb 2013 |
| 191 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 192 | Little Chief Energy Corporation | Independence, KS 67301 | Oil Operator | Feb 2025 |
| 193 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 194 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Feb 2025 |
| 195 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2025 |
| 196 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Feb 2025 |
| 197 | Littrell Chemical Inc | Cleo Springs, OK 73729 | Oil & Gas Operator | Jan 2005 |
| 198 | Litzenberger Exploration | Waynoka, OK 73860 | Oil & Gas Operator | Jul 1996 |
| 199 | Litzenberger Exploration Inc | Waynoka, OK 73860 | Oil & Gas Operator | Mar 2025 |
| 200 | Lo-Jel Energy LLC | Oklahoma City, OK 73162-7418 | Oil & Gas Operator | Nov 2019 |