| 101 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 102 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |
| 103 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Mar 2025 |
| 104 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 105 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 106 | Hrbacek Oil Corp. | La Grange, TX 78945 | Oil & Gas Operator | Feb 2004 |
| 107 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 108 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Mar 2025 |
| 109 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 110 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 111 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 112 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 113 | J.W. Service Company | Smithville, TX 78957 | Oil & Gas Operator | Mar 2025 |
| 114 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 115 | JKW Energy Division | Abilene, TX 79608 | Oil & Gas Operator | Aug 2010 |
| 116 | Joe R. Cheatham Oil Company | Lockhart, TX 78644 | Oil Operator | Mar 2025 |
| 117 | Johnson Royalties, Inc. | Austin, TX 78729 | Oil & Gas Operator | Jul 2002 |
| 118 | Johnson Sanford Op Co., LTD | Leander, TX 78641 | Oil & Gas Operator | Mar 2025 |
| 119 | Josey, Lenoir M., Inc. | Houston, TX 77019 | Oil & Gas Operator | Aug 2003 |
| 120 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 121 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 122 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 123 | Kingwood Oil Co; Inc | Luling, TX 78648 | Oil & Gas Operator | Nov 2015 |
| 124 | Klutts, Carlos J. | Austin, TX 78711 | Oil & Gas Operator | Apr 2002 |
| 125 | L & R Drilling Company | Belle Fourche, SD 57717 | Oil & Gas Operator | Dec 1999 |
| 126 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 127 | Landmen Of Texas | Hondo, TX 78861 | Oil Operator | Feb 2007 |
| 128 | Larison Oil Company | Katy, TX 77494 | Oil & Gas Operator | Mar 2025 |
| 129 | Le Bas Operating Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2000 |
| 130 | Leexus Oil & Gas L.L.P. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2008 |
| 131 | Leexus Oil LLC | Giddings, TX 78942 | Oil & Gas Operator | Mar 2025 |
| 132 | Leexus Operating Company | Austin, TX 78734 | Oil & Gas Operator | Aug 2007 |
| 133 | Leonard, J. A. | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 134 | Lower Colorado River Authority | Bastrop, TX 78602 | Oil & Gas Operator | Mar 2025 |
| 135 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 136 | Lynbrook Oil Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2008 |
| 137 | Lynch, W. W. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2006 |
| 138 | Lynch, W. Waldo | Uvalde, TX 78801 | Oil & Gas Operator | Jan 1996 |
| 139 | Lynd, J. L., Inc. | Austin, TX 78716 | Oil & Gas Operator | Sep 2009 |
| 140 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 141 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 142 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Mar 2025 |
| 143 | Main Street Royalty, Inc. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 1999 |
| 144 | Marymac Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2001 |
| 145 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 146 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 147 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 148 | Meb, LLC | Austin, TX 78737 | Oil Operator | Mar 2025 |
| 149 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 150 | Merica Oil Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2024 |
| 151 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 152 | Miller, W. C. Operating Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 153 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 154 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Mar 2025 |
| 155 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 156 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 157 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Mar 2025 |
| 158 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Mar 2025 |
| 159 | Nelmark Energy Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Apr 2002 |
| 160 | Nelms Bros. Oil Properties Inc. | Austin, TX 78711 | Oil & Gas Operator | Jun 1996 |
| 161 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | Mar 2025 |
| 162 | Noble Producing Company Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 1996 |
| 163 | Nobleson Operating, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Jun 1996 |
| 164 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 165 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 166 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2025 |
| 167 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 168 | Osyka Oil & Gas, Inc. | Metairie, LA 70004 | Oil & Gas Operator | Mar 2025 |
| 169 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 170 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Mar 2025 |
| 171 | Pantano Energy | San Antonio, TX 78258 | Oil & Gas Operator | Jul 1999 |
| 172 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 173 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 174 | Pax Petroleum Corporation | La Jolla, CA 92037 | Oil & Gas Operator | Mar 2008 |
| 175 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Mar 2025 |
| 176 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | Mar 2025 |
| 177 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 178 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 179 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 180 | Production Resources, Inc. | Castroville, TX 78009 | Oil & Gas Operator | Mar 2025 |
| 181 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2025 |
| 182 | Quest Research & Dev. Corp. | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 183 | R & S Energy Company | Luling, TX 78648 | Oil & Gas Operator | Dec 2010 |
| 184 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 185 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Mar 2025 |
| 186 | Rainer Energy, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 187 | Rannic Inc. | Baytown, TX 77521 | Oil Operator | Mar 2025 |
| 188 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 189 | Rayalto Oil & Gas, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2004 |
| 190 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 191 | Regency Energy, Inc. | Crystal City, TX 78839 | Oil & Gas Operator | Mar 2025 |
| 192 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2025 |
| 193 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Mar 2025 |
| 194 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Mar 2025 |
| 195 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 196 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 197 | Rocking Lazy Little B Ranch Oil | Cedar Creek, TX 78612 | Oil Operator | Apr 2011 |
| 198 | Rodenberg, Laura Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 199 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Mar 2025 |
| 200 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |