| 101 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 102 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 103 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 104 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 105 | Kollao Properties LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 106 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 107 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 108 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 109 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 110 | Leeper Oil Exp. & Prod. Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 111 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 112 | Leverage Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2021 |
| 113 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 114 | Lively Energy & Development Corp | Boerne, TX 78015 | Oil & Gas Operator | May 2015 |
| 115 | Lively Exploration Company | Houston, TX 77063 | Oil & Gas Operator | Feb 2026 |
| 116 | Lively Resources, Inc. | Houston, TX 77056 | Gas Operator | Dec 1998 |
| 117 | Lolocav, LLC | Sonora, TX 76950 | Oil & Gas Operator | Feb 2026 |
| 118 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 119 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 120 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 121 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 122 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 123 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 124 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 125 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 126 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 127 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 128 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Feb 2026 |
| 129 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Feb 2026 |
| 130 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 131 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 132 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 133 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 134 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 135 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 136 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 137 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 138 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 139 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Feb 2026 |
| 140 | Nuevo Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2004 |
| 141 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Feb 2026 |
| 142 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 143 | Oakridge Energy, Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | Feb 2026 |
| 144 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 145 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 146 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 147 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 148 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 149 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 150 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Feb 2026 |
| 151 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 152 | Patno Oil & Gas Company | Zapata, TX 78076 | Oil & Gas Operator | Feb 2026 |
| 153 | Patoil Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Aug 2003 |
| 154 | Pegasus Energy | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 1997 |
| 155 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 156 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 157 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 158 | Pioneer Gas Pipeline, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Feb 2026 |
| 159 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 160 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 161 | Polk Petroleum, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 162 | Prestco, LLC | Ozona, TX 76943 | Oil & Gas Operator | Mar 2025 |
| 163 | Probe Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jul 2016 |
| 164 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Feb 2026 |
| 165 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 166 | Purvis, J. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 167 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |
| 168 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 169 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 170 | Red Stag Operating, LLC | Ozona, TX 76943 | Oil & Gas Operator | Feb 2026 |
| 171 | Regal Development Inc. | Eldorado, TX 76936 | Gas Operator | Jul 1996 |
| 172 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 173 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 174 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Feb 2026 |
| 175 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 176 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 177 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 178 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 179 | Robbins Petroleum Corp. | Longview, TX 75606 | Oil & Gas Operator | Sep 1994 |
| 180 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | Feb 2026 |
| 181 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Feb 2026 |
| 182 | Rocking R Investments, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 183 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 184 | Rubicon Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 185 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 186 | Sagebrush Oilandgas Company,LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2010 |
| 187 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 188 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 189 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 190 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 191 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 192 | Sayers Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2005 |
| 193 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 194 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 195 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Feb 2026 |
| 196 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 197 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 198 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 199 | Sonat Exploration Co. - Midland | Houston, TX 77251 | Oil & Gas Operator | Mar 1999 |
| 200 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |