| 101 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 102 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 103 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | May 2025 |
| 104 | Klo Oil & Gas, L.L.C. | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2023 |
| 105 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 106 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 107 | Lance Oil & Gas Productions | Bloomburg, TX 75556 | Oil & Gas Operator | May 2025 |
| 108 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 109 | Lodi Drilling & Service Co. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | May 2025 |
| 110 | Long Operating, L.L.C. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2006 |
| 111 | Long Petroleum, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2020 |
| 112 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 113 | Louisiana Energy Consultant Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 114 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 115 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 116 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | May 2025 |
| 117 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 118 | Magnolia Production Co | Atlanta, TX 75551 | Oil & Gas Operator | May 2025 |
| 119 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 120 | Marion County Prod. Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 121 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 122 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 123 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | May 2025 |
| 124 | McCormick Production Co, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2025 |
| 125 | McDonald Resources, LLC | Jefferson, TX 75657 | Oil & Gas Operator | May 2025 |
| 126 | McKnight, C. L. | McLeod, TX 75565 | Oil & Gas Operator | May 2025 |
| 127 | McKnight, C. L. Oil Co. LLP | McLeod, TX 75565 | Oil & Gas Operator | May 2025 |
| 128 | McKnight, J. C. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2019 |
| 129 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 130 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 131 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 132 | Moransco Energy Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 133 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 134 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 135 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 136 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 137 | NKC Energy, LLC | Bruceville, TX 76630 | Oil Operator | May 2025 |
| 138 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 139 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 140 | O&G Investments Inc. | Runge, TX 78151 | Oil & Gas Operator | Feb 2003 |
| 141 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | May 2025 |
| 142 | Oakridge Energy, Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2025 |
| 143 | Oil Patch Operators Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 144 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 145 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 146 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 147 | Pegasi Energy Resources Corp | Tyler, TX 75710 | Oil & Gas Operator | Jul 2007 |
| 148 | Pegasi Operating Inc. | Jefferson, TX 75657 | Oil & Gas Operator | May 2025 |
| 149 | Pegasus P And A LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 150 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 151 | Performance Operating Partners, LLC | Shreveport, LA 71164 | Oil & Gas Operator | May 2025 |
| 152 | Person, J.S., Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 153 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 154 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 155 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | May 2025 |
| 156 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 157 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 158 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 159 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 160 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 161 | Prime Natural Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 2007 |
| 162 | Prime Operating | Queen City, TX 75572 | Oil & Gas Operator | Apr 2005 |
| 163 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 164 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | May 2025 |
| 165 | Pullco Services LLC | Jefferson, TX 75657 | Oil Operator | May 2025 |
| 166 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 167 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |
| 168 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 169 | Red River Oil & Gas LLC | Cherry Hills, CO 80110 | Oil & Gas Operator | Feb 2025 |
| 170 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 171 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | May 2025 |
| 172 | Robertson-Bryce Management, LLC | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 173 | Rockwall Marketing Corporation | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2007 |
| 174 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | May 2025 |
| 175 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 176 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 177 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 178 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 179 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 180 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 181 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 182 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 183 | Sandpoint Texas LLC | Houston, TX 77270 | Oil Operator | May 2025 |
| 184 | Savannah Oil Co. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2007 |
| 185 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 186 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 187 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 188 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 189 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 190 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 191 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 192 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 193 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 194 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 195 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 196 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 197 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 198 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 199 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 200 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |