| 101 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 102 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 103 | Leben Theodore I | | Oil & Gas Operator | Dec 1995 |
| 104 | Lebosquet Gas Operations, LLC | Wichita, KS 67202 | Gas Operator | Dec 2025 |
| 105 | Lebosquet John R | | Gas Operator | Dec 1994 |
| 106 | Lebosquet, John W. | Wichita, KS 67202 | Gas Operator | Dec 2025 |
| 107 | Lebow, Marvin E. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1997 |
| 108 | Lebsack Oil Prod | | Oil & Gas Operator | Nov 1995 |
| 109 | Lebsack Oil Production Inc. | Stafford, KS 67578 | Oil & Gas Operator | Dec 2025 |
| 110 | Lebsack, James S. | Denver, CO 80222 | Oil Operator | Sep 1998 |
| 111 | Led Enterprises | El Dorado, KS 67042 | Oil Operator | Sep 1999 |
| 112 | Led Enterprises LLC | El Dorado, KS 67042 | Oil Operator | Dec 2009 |
| 113 | Lee Donna Oil Co | | Oil & Gas Operator | Dec 1996 |
| 114 | Lee Phillips Oil Company | | Oil Operator | Dec 2025 |
| 115 | Leedy Oil Produc | | Oil & Gas Operator | Dec 1995 |
| 116 | Leedy Oil Producers | | Oil Operator | Nov 2009 |
| 117 | Legacy Energy, LLC | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 118 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2026 |
| 119 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Apr 2026 |
| 120 | Legend Energy LLC | Cherryvale, KS 67335 | Oil Operator | Dec 2025 |
| 121 | Legend Oil & Gas LTD. | Alpharetta, GA 30022 | Oil Operator | Mar 2015 |
| 122 | Legleiter, Julius A. | Hays, KS 67601 | Oil Operator | Apr 1996 |
| 123 | Legrand, Buck | Sedan, KS 67361 | Oil Operator | Jun 1994 |
| 124 | Leiker, Edward P. | Hays, KS 67601 | Oil Operator | Apr 1992 |
| 125 | Leis Oil Services, LLC | Yates Center, KS 66783 | Oil Operator | Jul 2023 |
| 126 | Leis, John E. | Yates Center, KS 66783 | Oil Operator | Dec 2025 |
| 127 | Leis, Ryan M. | Scottsdale, AZ 85258 | Oil & Gas Operator | Dec 2009 |
| 128 | Leis, Steven A. | Yates Center, KS 66783 | Oil Operator | Dec 2025 |
| 129 | Leis, VIctor J. | Paola, KS 66071 | Oil & Gas Operator | Dec 2025 |
| 130 | Leith Operations | | Oil Operator | Jul 1989 |
| 131 | Leo Michaelis Oil Operator | | Oil Operator | Oct 2002 |
| 132 | Leonard, Daniel M. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2001 |
| 133 | Leroy Holt Oil Operations | | Oil Operator | Mar 2010 |
| 134 | Levi Oil Company | Wichita, KS 67218 | Oil & Gas Operator | Nov 1993 |
| 135 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Feb 2026 |
| 136 | Lewis Oil & Gas Of Galva, Inc. | Galva, KS 67443 | Oil Operator | Dec 2025 |
| 137 | Lewis, Beverly J | | Oil Operator | Nov 2025 |
| 138 | LH Oil, LLC | Ottawa, KS 66067 | Oil Operator | Dec 2025 |
| 139 | Liberty Enterpri | | Oil Operator | Jan 1987 |
| 140 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 141 | Liboc, Inc. | New York, NY 10110 | Oil & Gas Operator | Dec 2009 |
| 142 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 143 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2026 |
| 144 | Lincoln 77 Inc | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 145 | Line, Jerry W., SR. | Tulsa, OK 74137 | Oil Operator | Nov 1996 |
| 146 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 147 | Lio-1 Corporation | Las Vegas, NV 89116 | Oil Operator | Sep 2025 |
| 148 | Lion Oil Company | Chanute, KS 66720 | Oil Operator | Dec 1986 |
| 149 | Litan, David | Wichita, KS 67218 | Oil Operator | Jun 1990 |
| 150 | Little Chief Energy Corporation | Independence, KS 67301 | Oil Operator | Feb 2026 |
| 151 | Little Guy Oil & Gas, Inc. | Pratt, KS 67124 | Oil Operator | Aug 2013 |
| 152 | Little Joe'S Oil Company | | Oil Operator | Jul 2020 |
| 153 | Little Neil Oil | | Oil Operator | Jul 1994 |
| 154 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 155 | Lloyd Drilling C | | Oil Operator | Aug 1995 |
| 156 | Lloyd Drilling Company | Morland, KS 67650 | Oil Operator | Oct 2009 |
| 157 | Lobo Oil & Gas, LLC | Benedict, KS 66714 | Oil Operator | Jan 2019 |
| 158 | Lobo Production, Inc | Goodland, KS 67735 | Gas Operator | Dec 2025 |
| 159 | Lockard Petroleum, Inc. | Hamilton, KS 66853 | Oil Operator | Dec 2019 |
| 160 | Lockhart Oil LLC | Neosho Falls, KS 66758 | Oil Operator | Oct 2025 |
| 161 | Lockridge, John P | Denver, CO 80202 | Gas Operator | Mar 1999 |
| 162 | Loeb Herman L | | Oil & Gas Operator | Jan 1996 |
| 163 | Loewen E K | | Oil Operator | Mar 1986 |
| 164 | Loewen Operator | | Oil & Gas Operator | Mar 1995 |
| 165 | Loewen Operator, Inc. | Canton, KS 67428 | Oil & Gas Operator | Nov 2025 |
| 166 | Logsdon Richard | | Oil Operator | Mar 1988 |
| 167 | Lone Jack Oil Co. | | Oil Operator | Dec 2025 |
| 168 | Lone Star Interests, Inc. | Chanute, KS 66720 | Oil Operator | Sep 2001 |
| 169 | Lone Star Oil Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 170 | Lone Star Resources Company | Keyes, OK 73947 | Oil & Gas Operator | Mar 2015 |
| 171 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Apr 2026 |
| 172 | Lone Wolf Oil & Gas Co., LLC | Moline, KS 67353 | Oil & Gas Operator | Dec 2025 |
| 173 | Lone Wolf Oil LLC | Wellsville, KS 66092 | Oil Operator | Dec 2009 |
| 174 | Long And Ware Oil, A General Partnership | Pawhuska, OK 74056 | Oil Operator | Jan 2021 |
| 175 | Long Drilling Company, LLC | Hamilton, KS 66853 | Oil Operator | Dec 2025 |
| 176 | Long Shot Oil Co. | | Oil Operator | Aug 1997 |
| 177 | Long, Edwin A. And Glenda | Hamilton, KS 66853 | Oil Operator | Aug 2000 |
| 178 | Long, Lewis C., A General Partnership | Hamilton, KS 66853 | Oil Operator | Dec 2019 |
| 179 | Long, Marshall | Chase, KS 67524 | Oil Operator | Mar 1986 |
| 180 | Longhorn Crude, LLC | Jetmore, KS 67854 | Oil Operator | Nov 2025 |
| 181 | Longhorn Energy | | Oil & Gas Operator | Jun 1991 |
| 182 | Longhorn Oil & Gas | | Oil Operator | Sep 2025 |
| 183 | Longhorn Propert | | Oil Operator | Feb 1989 |
| 184 | Longton Explorat | | Oil & Gas Operator | Jul 1993 |
| 185 | Longton Explorations | | Oil & Gas Operator | Aug 2025 |
| 186 | Lonny Bruce Operations, L.L.C. | McPherson, KS 67460 | Oil & Gas Operator | Apr 2009 |
| 187 | Lorenz, Barton T. | Cherryvale, KS 67335 | Oil & Gas Operator | Jul 2013 |
| 188 | Lorenz, James D. | Parsons, KS 67357 | Oil & Gas Operator | May 2014 |
| 189 | Lorenzen Oil Company, Inc. | O?Fallon, MO 63368 | Oil Operator | Sep 2025 |
| 190 | Lotus Operating Company, L.L.C. | Wichita, KS 67204 | Oil & Gas Operator | Dec 2025 |
| 191 | Louis Dreyfus Natural Gas Corp. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2015 |
| 192 | Loveland Energy LLC | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 193 | Lowry Exploratio | | Oil Operator | May 1994 |
| 194 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2026 |
| 195 | Loyd, John H. | Warrensburg, MO 64903 | Oil Operator | Aug 2000 |
| 196 | LR Energy, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 197 | LRC Development Corporation | Hays, KS 67601 | Oil Operator | Mar 2009 |
| 198 | LRR Partnership | | Oil Operator | Sep 2023 |
| 199 | Lucky Crude, LLC | Erie, KS 66733 | Oil Operator | Nov 2025 |
| 200 | Lucky Iron | | Oil Operator | Dec 2025 |