| 101 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 102 | R K R Exploration | Seminole, OK 74868-9754 | Oil & Gas Operator | Mar 2015 |
| 103 | R L Clampitt & Associates LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2025 |
| 104 | R L Kelly, SR. | | Oil Operator | Feb 2009 |
| 105 | R L Operating Co LLC | | Oil Operator | Aug 2024 |
| 106 | R L Turner Oil Company LLC | Duncan, OK 73533 | Oil Operator | Nov 2025 |
| 107 | R M Oil & Gas Co | | Oil Operator | Jul 1999 |
| 108 | R M S Oil & Gas | Amarillo, TX 79101-2445 | Oil & Gas Operator | Sep 1997 |
| 109 | R R & M Oil | Okmulgee, OK 74447-8534 | Oil & Gas Operator | Oct 2015 |
| 110 | R R Operation Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2004 |
| 111 | R S E C LLC | | Oil & Gas Operator | Nov 2002 |
| 112 | R S E Partners-I LP | Oklahoma City, OK 731025261 | Oil & Gas Operator | Feb 2000 |
| 113 | R S V Co, Inc | Pikeville, KY 41501 | Gas Operator | Dec 2021 |
| 114 | R W Operating | Graford, TX 76449 | Oil & Gas Operator | Dec 2016 |
| 115 | R W Production Company Inc | Ada, OK 74821-2693 | Oil & Gas Operator | Apr 2011 |
| 116 | R W Ranch | San Antonio, TX 78211 | Oil Operator | Dec 2025 |
| 117 | R Wolfe Oil & Gas LLC | Athens, OH 45701 | Oil & Gas Operator | Dec 2024 |
| 118 | R&D Enterprises- | | Oil Operator | Dec 1988 |
| 119 | R&F Operating Company | Carthage, TX 75633 | Oil Operator | Dec 2025 |
| 120 | R&K Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 121 | R&R Production Company, LLC | Tulsa, OK 74137 | Oil & Gas Operator | Nov 2025 |
| 122 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 123 | R&R Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 124 | R-A-R Interests | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2003 |
| 125 | R-Jann-N Oil | | Oil Operator | Dec 1999 |
| 126 | R. & R. Exploration, Inc. | Denton, TX 76202 | Oil Operator | Nov 1993 |
| 127 | R. A. Bridges | | Oil Operator | Jun 1991 |
| 128 | R. A. Campbell Company | | Oil & Gas Operator | Nov 1995 |
| 129 | R. B. Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 1996 |
| 130 | R. C. Production | | Oil & Gas Operator | Nov 2024 |
| 131 | R. D. Briscoe, Inc. | | Oil & Gas Operator | Nov 2024 |
| 132 | R. D. Energy, Inc. | Sedan, KS 67361 | Oil Operator | Sep 2025 |
| 133 | R. D. Finnesy Oil | | Oil Operator | Nov 2019 |
| 134 | R. D. Wiles, Inc. | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 135 | R. E. Hibbert Operator | | Gas Operator | Dec 1984 |
| 136 | R. E. Markham | | Oil & Gas Operator | Mar 1995 |
| 137 | R. E. Markham Et Al | | Gas Operator | Jun 1996 |
| 138 | R. H. Davis | | Oil Operator | Apr 2001 |
| 139 | R. I. P. Operating | | Oil Operator | Oct 1986 |
| 140 | R. J. Bellevue | | Oil & Gas Operator | Oct 2025 |
| 141 | R. J. Davenport | | Oil Operator | May 1985 |
| 142 | R. J. Oil Co. | Olney, TX 76374 | Oil & Gas Operator | May 2025 |
| 143 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 144 | R. L. Burns Corp. | | Oil & Gas Operator | Feb 1982 |
| 145 | R. L. Davis | | Oil Operator | Dec 2024 |
| 146 | R. L. Dempsey | | Oil Operator | Jun 1985 |
| 147 | R. Lacy Services, LTD. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 148 | R. M. Hobbs | | Oil Operator | Sep 2000 |
| 149 | R. P. Nixon Operations, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 150 | R. Pannell Oil Company | Kilgore, TX 75663 | Oil Operator | Jan 2025 |
| 151 | R. Scott Price | | Oil & Gas Operator | Dec 1994 |
| 152 | R. V. Drummond, Et Al | | Oil Operator | Nov 1999 |
| 153 | R. W. Ellington, Jr. | | Gas Operator | May 1985 |
| 154 | R. W. Henry | | Oil & Gas Operator | Dec 1999 |
| 155 | R. W. S. Oil Co. | Grandfalls, TX 79742 | Oil & Gas Operator | Dec 2025 |
| 156 | R. W. Shull | | Oil & Gas Operator | Dec 1986 |
| 157 | R. W. Tyson Producing Co.,Inc | | Oil & Gas Operator | Dec 2024 |
| 158 | R. W. Wilson | | Gas Operator | May 1988 |
| 159 | R.A. Campbell & Dale Expl | | Oil Operator | Nov 1995 |
| 160 | R.B. Evans | | Gas Operator | Aug 1985 |
| 161 | R.B.S. Oil & Gas Inc. | San Antonio, TX 78278 | Oil & Gas Operator | Dec 2025 |
| 162 | R.C.Bertolet & Serio Expl Co | | Oil & Gas Operator | Nov 1992 |
| 163 | R.C.I. Energy | Alice, TX 78333 | Oil & Gas Operator | Dec 2025 |
| 164 | R.C.S. Oil, Inc. | Conrad, MT 59425 | Oil Operator | Oct 2025 |
| 165 | R.C.Taylor Companies, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 166 | R.Chisum, Jr. & L. Shepherd | | Oil & Gas Operator | Nov 2001 |
| 167 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Dec 2025 |
| 168 | R.E. McDowell & Dave Gammill | | Oil Operator | May 1978 |
| 169 | R.E.D. Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2004 |
| 170 | R.E.French Oil Company, L.L.C. | Gridley, KS 66852 | Oil Operator | Nov 1999 |
| 171 | R.E.J.A.S. Energy LLC | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 172 | R.H.S. Oil Company | | Oil Operator | Nov 2009 |
| 173 | R.J. Patrick Operating Co. | | Oil & Gas Operator | Jun 2006 |
| 174 | R.J. Riley Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 175 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 176 | R.P.Wilson, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Jan 2011 |
| 177 | R.S. Glaze Drilling | | Oil Operator | Jan 1998 |
| 178 | R.T. Enterprises Of Kansas, Inc. | Louisburg, KS 66053 | Oil Operator | Sep 2025 |
| 179 | R.T.C. Resources, L.P. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 180 | R/C Holdings, Inc. | | Oil & Gas Operator | Dec 1991 |
| 181 | R2Q Operating LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2025 |
| 182 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 183 | R3 Resources Operating Corporation | Denver, CO 80222 | Gas Operator | Oct 2025 |
| 184 | R360 Environmental Solutions Of La, LLC | | Oil Operator | Jan 2025 |
| 185 | R360 Oklahoma LLC | The Woodlands, TX 77381 | Oil Operator | Jul 2021 |
| 186 | Ra-Jac LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 187 | Raak-Wilson Properties | | Oil & Gas Operator | Dec 1999 |
| 188 | Rab Oil & Gas LLC | Garrettsville, OH 44231 | Oil & Gas Operator | Dec 2024 |
| 189 | Rabalais Oil And Gas, Inc. | | Oil & Gas Operator | Sep 2023 |
| 190 | Rabalais, F.W. Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2023 |
| 191 | Rabb Contracting Company, L.L.C. | | Oil Operator | Nov 2024 |
| 192 | Rabb Resources, Limited | | Oil Operator | Dec 2002 |
| 193 | Rabbitt C Michael | Chicora, PA 16025-1916 | Oil & Gas Operator | Dec 2015 |
| 194 | Rabco Energy | Amarillo, TX 79120 | Oil & Gas Operator | Apr 2025 |
| 195 | Rabco Energy LLC | Amarillo, TX 79120 | Gas Operator | Dec 2025 |
| 196 | Rabun Resources | | Gas Operator | Jan 2025 |
| 197 | Rabwin Oil & Gas, Inc. | | Oil & Gas Operator | Nov 1991 |
| 198 | Rachael Exploration Corp | Traverse City, MI 49686 | Oil & Gas Operator | Apr 2001 |
| 199 | Rackley Oil & Gas, LLC | Balko, OK 73931 | Oil & Gas Operator | Oct 2025 |
| 200 | Rad Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Dec 2025 |