| 101 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 102 | Kanon Oil LLC | Cameron, TX 76520 | Oil Operator | Jun 2024 |
| 103 | Kasan Corp. | Pharr, TX 78577 | Oil & Gas Operator | Sep 1995 |
| 104 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 105 | Kingman Operating Company, Inc. | Austin, TX 78729 | Oil Operator | Jun 2013 |
| 106 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 107 | Liquid Petroleum Resources, Inc. | Amarillo, TX 79120 | Gas Operator | May 2025 |
| 108 | Live Oak Op & Production, L.L.C. | Austin, TX 78759 | Oil & Gas Operator | Nov 2011 |
| 109 | Lone Star Operations LLC | Lubbock, TX 79401 | Oil & Gas Operator | May 2025 |
| 110 | LRR Pecos Valley, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 111 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 112 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | May 2025 |
| 113 | Mascot Oil Company | Schulenburg, TX 78956 | Oil & Gas Operator | May 2025 |
| 114 | McCrary Oil Company, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Sep 2019 |
| 115 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 116 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 117 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | May 2025 |
| 118 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 119 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 120 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 121 | Mojo Exploration & Production, L | Rockdale, TX 76567 | Oil Operator | May 2025 |
| 122 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 123 | Navalo | Rockdale, TX 76567 | Oil Operator | May 2025 |
| 124 | Navarro Exploration Co., Inc. | Kingwood, TX 77345 | Oil & Gas Operator | May 2025 |
| 125 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 126 | North Texas Energy,Inc. | Dallas, TX 75252 | Oil Operator | May 2025 |
| 127 | Northland Petroleum, Inc. | Houston, TX 77043 | Oil Operator | Dec 2018 |
| 128 | Northland Petroleum, LLC | Houston, TX 77043 | Oil Operator | May 2025 |
| 129 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 130 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 131 | Omni E & P, Inc. | San Antonio, TX 78229 | Oil Operator | Apr 2010 |
| 132 | Omni Oil & Gas, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2017 |
| 133 | One World Operating, LLC | Tampa, FL 33602 | Oil & Gas Operator | May 2025 |
| 134 | Orson Leasing & Supply | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2006 |
| 135 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 136 | Oxford Oil Co. | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2004 |
| 137 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 138 | Pairadice Oil & Gas Company LLC | Caldwell, TX 77836 | Oil Operator | May 2025 |
| 139 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 140 | Pemberton, W. C. Oil Co., Inc. | Cameron, TX 76520 | Oil & Gas Operator | May 2025 |
| 141 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 142 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | May 2025 |
| 143 | Petro Delta | Rockdale, TX 76567 | Oil Operator | May 2025 |
| 144 | Petrolia Energy Corporation | Pearland, TX 77581 | Oil Operator | Jan 2024 |
| 145 | Pgi Operating, LLC | Sweetwater, TX 79556 | Oil Operator | May 2025 |
| 146 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 147 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 148 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 149 | Price Operating, LLC | Sugar Land, TX 77496 | Oil Operator | May 2025 |
| 150 | Production Enterprises | Houston, TX 77075 | Oil & Gas Operator | Aug 2007 |
| 151 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | May 2025 |
| 152 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 153 | Raymond, WM. C. | Rockdale, TX 76567 | Oil & Gas Operator | May 2025 |
| 154 | Red Hills Energy, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jan 2025 |
| 155 | Red Oak Oil Company, LLC | Spring, TX 77379 | Oil Operator | May 2025 |
| 156 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | May 2025 |
| 157 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 158 | Richard'S Texas Tea | Rockdale, TX 76567 | Oil Operator | May 2025 |
| 159 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 160 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 161 | Rockdale Resources Corporation | Houston, TX 77024 | Oil Operator | Jul 2016 |
| 162 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | May 2025 |
| 163 | Rosenthal, Stanley H. | Bay City, TX 77404 | Oil & Gas Operator | Dec 2020 |
| 164 | Ross Operating Company | Shreveport, LA 71163 | Oil & Gas Operator | May 1996 |
| 165 | Rto Operating, LLC | San Antonio, TX 78212 | Oil Operator | Feb 2016 |
| 166 | Rusk Energy Operating LLC | Houston, TX 77040 | Oil & Gas Operator | May 2025 |
| 167 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 168 | S & JB, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2010 |
| 169 | S&JB, LLC | Rockdale, TX 76567 | Oil & Gas Operator | May 2025 |
| 170 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | May 2025 |
| 171 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | May 2025 |
| 172 | Schneider, Ernest | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2014 |
| 173 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 174 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 175 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 176 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 177 | Shale Operating Co. | Dallas, TX 75356 | Oil & Gas Operator | May 2025 |
| 178 | Sheldon Resources, L.P. | Bryan, TX 77805 | Oil & Gas Operator | May 2025 |
| 179 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | May 2025 |
| 180 | SHWJ Oil & Gas Co., Inc. | Oil City, LA 71061 | Oil Operator | May 2025 |
| 181 | Sierra Minerals, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | May 2025 |
| 182 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 183 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | May 2025 |
| 184 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | May 2025 |
| 185 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 186 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 187 | Stewardship Resources | Roanoke, TX 76262 | Oil & Gas Operator | Jun 2022 |
| 188 | Stingray Oil Company, Inc. | Mullin, TX 76864 | Oil Operator | May 2025 |
| 189 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 190 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 191 | Tahiti PTRS Enrgy Solutions Corp | Long Beach, CA 90807 | Oil Operator | May 2025 |
| 192 | Tesuque Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | May 2025 |
| 193 | Texas Land & Trading Co, Inc. | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 194 | Texas Onshore Energy, Inc. | Austin, TX 78704 | Oil & Gas Operator | May 2025 |
| 195 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | May 2025 |
| 196 | Three Forks Operating Co, LLC | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 197 | Three-C Production Company | Temple, TX 76502 | Oil Operator | May 2025 |
| 198 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | May 2025 |
| 199 | Tor Energy, LLC | Temple, TX 76501 | Oil & Gas Operator | May 2025 |
| 200 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |