| 101 | 4-M Oil | | Oil Operator | Dec 2024 |
| 102 | 4-M Operating Company | Abilene, TX 79601 | Oil & Gas Operator | Jun 2015 |
| 103 | 4-Sight Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2006 |
| 104 | 4-Sight Operating Company II | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2000 |
| 105 | 4-Sight Operating Company, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 106 | 4360 Walden Avenue, LLC | Lancaster, NY 14086 | Gas Operator | Dec 2023 |
| 107 | 44 Canyon LLC | | Gas Operator | Mar 2006 |
| 108 | 44 Mag Production Inc | | Gas Operator | Mar 2012 |
| 109 | 442 Operating La, LLC | | Oil & Gas Operator | Dec 2024 |
| 110 | 4927 Bramblewood Trail, LLC | Canandaigua, NY 14424 | Gas Operator | Dec 2023 |
| 111 | 4a Oilfield Enterprises, LLC | Longview, TX 75602 | Oil & Gas Operator | Jan 2024 |
| 112 | 4C Oil, LLC | Cameron, TX 76520 | Oil Operator | Apr 2025 |
| 113 | 4D Energy Co. | Sterling City, TX 76951 | Oil & Gas Operator | Feb 2007 |
| 114 | 4D Oil LLC | Cushing, OK 74023 | Oil Operator | Dec 2024 |
| 115 | 4D'S Enterprises, LLC | Rantoul, KS 66079 | Oil Operator | Sep 2018 |
| 116 | 4D'S Operating Co LLC (The) | Ratliff City, OK 73481 | Oil & Gas Operator | Jan 2025 |
| 117 | 4G Operating LLC | Kinta, OK 74552 | Gas Operator | Jan 2025 |
| 118 | 4H Oil Co. | | Oil Operator | Dec 1992 |
| 119 | 4J Energy LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 120 | 4J Oil Co. LLC | Ryan, OK 73565 | Oil Operator | Apr 2025 |
| 121 | 4J Well Service, Inc | | Oil Operator | Feb 2025 |
| 122 | 4P Energy Texas, LLC | Denver, CO 80206 | Oil & Gas Operator | Nov 2020 |
| 123 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 124 | 4R Petroleum, Inc. | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 125 | 4W Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 126 | 4W Ranch | Newcastle, WY 82701 | Oil Operator | Apr 2008 |
| 127 | 5 G Resources, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 128 | 5 K Oil LLC | Toronto, KS 66777 | Oil Operator | May 2024 |
| 129 | 5 Schkade | Albany, TX 76430 | Oil Operator | Apr 2025 |
| 130 | 5-Buck'S Oil Company LLC | Sedan, KS 67361-0068 | Gas Operator | Jun 2018 |
| 131 | 5-N Energy | Winnsboro, TX 75494 | Oil & Gas Operator | Aug 2011 |
| 132 | 500X Operating LLC | Andrews, TX 79714 | Oil Operator | Apr 2025 |
| 133 | 56 Oil & Gas LTD | Norman, OK 73070-4065 | Oil Operator | May 2018 |
| 134 | 5H Oil Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 135 | 5L Properties | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2002 |
| 136 | 5L Properties, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 137 | 5P Operating, LLC | Coppell, TX 75019 | Oil & Gas Operator | Apr 2025 |
| 138 | 5R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 2025 |
| 139 | 5stone Operating Inc | Big Lake, TX 76932 | Oil Operator | Apr 2025 |
| 140 | 6 Hess, LLC | Muenster, TX 76252 | Oil Operator | Apr 2025 |
| 141 | 6a Production | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 142 | 6G Twister, Inc. | Gillette, WY 82717 | Oil Operator | Jul 2012 |
| 143 | 7-Iron Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 144 | 77 Oil Properties, Inc. | Wichita Falls, TX 76307 | Gas Operator | Mar 2002 |
| 145 | 7711 Corporation, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 146 | 7C Land & Minerals Co | Ada, OK 74820 | Oil & Gas Operator | Jan 2025 |
| 147 | 7S Oil & Gas, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2019 |
| 148 | 8 North LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 149 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 150 | 806 Operating LLC | Canadian, TX 79014 | Gas Operator | Apr 2025 |
| 151 | 84 Energy LLC | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2025 |
| 152 | 86-Oil & Gas | Hamlin, TX 79520 | Oil & Gas Operator | Oct 2003 |
| 153 | 89 Energy II LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Apr 2022 |
| 154 | 89 Energy LLC | Oklahoma City, OK 73102-4832 | Oil & Gas Operator | Jun 2022 |
| 155 | 911 Claims Corp | El Campo, TX 77437 | Oil & Gas Operator | Apr 2025 |
| 156 | 9K Investments LLC | Cisco, TX 76437 | Oil & Gas Operator | Apr 2025 |
| 157 | A & A Discovery, Inc | Hill City, KS 67642 | Oil Operator | Aug 2002 |
| 158 | A & A Discovery, LLC | Hill City, KS 67642 | Oil Operator | May 2018 |
| 159 | A & A Oil Company | Luling, TX 78648 | Oil & Gas Operator | Oct 2009 |
| 160 | A & A Producers & Operators/Energy Prop. | | Oil & Gas Operator | Dec 1996 |
| 161 | A & A Production | | Oil Operator | Feb 2013 |
| 162 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2025 |
| 163 | A & A Well Service | Kincaid, KS 66039 | Oil Operator | Dec 2024 |
| 164 | A & B Minerals | Scotland, TX 76379 | Oil & Gas Operator | Sep 2020 |
| 165 | A & B Oil | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 166 | A & B Oil & Gas Properties Inc | Sapulpa, OK 74067-0217 | Oil & Gas Operator | Apr 2011 |
| 167 | A & B Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Apr 2015 |
| 168 | A & B Well Service Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Nov 2006 |
| 169 | A & C Gas Productions, Inc. | | Gas Operator | Mar 2012 |
| 170 | A & C Oil Company, LLC | Stockdale, TX 78160 | Oil Operator | Apr 2025 |
| 171 | A & D Exploration Company | Rockport, TX 78381 | Oil & Gas Operator | Apr 2025 |
| 172 | A & E Minerals, LLC | Shreveport, LA 71104 | Oil & Gas Operator | Apr 2025 |
| 173 | A & F Oil Company | | Oil & Gas Operator | Jan 2025 |
| 174 | A & F Production Company | | Oil Operator | Jan 2025 |
| 175 | A & G Oil & Gas | Shelby, MT 59474 | Oil & Gas Operator | Jul 2011 |
| 176 | A & G Oil Company | Chanute, KS 66720 | Oil Operator | Sep 1999 |
| 177 | A & G Oil Company, LLC | Barstow, TX 79719 | Oil & Gas Operator | Feb 2012 |
| 178 | A & G Producers, Inc. | Barstow, TX 79719 | Oil & Gas Operator | Apr 2025 |
| 179 | A & H Disposal Inc | Lindsay, OK 73052-0456 | Oil & Gas Operator | Jul 2019 |
| 180 | A & I Properties Inc | Oklahoma City, OK 73107 | Gas Operator | Jun 2007 |
| 181 | A & J Oil Compan | | Oil & Gas Operator | Dec 1994 |
| 182 | A & L Energy Operations LLC | New York, NY 10022 | Oil Operator | Sep 2013 |
| 183 | A & M Oil Company | Cyril, OK 73029 | Oil & Gas Operator | Feb 2025 |
| 184 | A & P Oil & Gas | Leona, TX 75850 | Oil Operator | Apr 2025 |
| 185 | A & R Energy Inc | Pittsburgh, PA 15244 | Oil & Gas Operator | Dec 2013 |
| 186 | A & R Oil & Gas Of Monroe & Washington Counties LLC | New Matamoras, OH 45767-0646-0646 | Oil & Gas Operator | Dec 2024 |
| 187 | A & S Prod Inc | Endeavor, PA 16322-0189 | Oil & Gas Operator | Dec 2024 |
| 188 | A & T Oil Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2008 |
| 189 | A & T Production Company | Wheat Ridge, CO 80034-1048 | Oil & Gas Operator | Jun 2009 |
| 190 | A & W Operating Inc | Drumright, OK 74030-5789 | Oil & Gas Operator | Mar 2015 |
| 191 | A - Z Operating LLC | Winters, TX 79567 | Oil Operator | Apr 2025 |
| 192 | A A Company | | Gas Operator | Jun 2005 |
| 193 | A A Production Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 194 | A Berry Enterprises LLC | Freeport, OH 43973 | Oil & Gas Operator | Dec 2023 |
| 195 | A C Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Mar 2008 |
| 196 | A D D Productions | Sweetwater, TX 79556 | Oil & Gas Operator | Jul 2019 |
| 197 | A E G Oil, Inc. | Hale Center, TX 79041 | Oil & Gas Operator | Apr 2025 |
| 198 | A E W Inc | Fayetteville, AR 72703 | Oil & Gas Operator | Mar 2015 |
| 199 | A H & L Operating Company Inc | Norman, OK 73070-4084 | Oil & Gas Operator | Apr 2015 |
| 200 | A J & A, Inc. | | Gas Operator | Feb 2009 |