| 4101 | Roms Co., Inc. | | Oil Operator | Jun 1983 |
| 4102 | Ron Knott & Associates,Inc. | | Oil & Gas Operator | Aug 1989 |
| 4103 | Ronald E. Hall | | Oil Operator | Nov 1991 |
| 4104 | Ronny N. Davis | | Oil Operator | Jan 2025 |
| 4105 | Rooster Petroleum, LLC | | Oil & Gas Operator | Feb 2011 |
| 4106 | Rooster Production, LLC | Oil City, LA 71061 | Oil Operator | Jan 2025 |
| 4107 | Roppolo Petro/Sun Explor& Prod | | Oil & Gas Operator | Sep 1988 |
| 4108 | Rosamond Drilling Co., Inc. | | Gas Operator | Nov 1984 |
| 4109 | Rosbottom Petroleum | | Oil & Gas Operator | Aug 1988 |
| 4110 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 4111 | Rosbottom-Caruthers Prodgcoinc | | Gas Operator | Nov 1990 |
| 4112 | Rose Pass Mines, Inc. | | Oil Operator | Oct 1982 |
| 4113 | Rosestone Operating Company, LLC | | Oil & Gas Operator | Dec 2024 |
| 4114 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 4115 | Rosewood Resources (HPC), Inc. | | Gas Operator | Dec 1984 |
| 4116 | Rosewood Resources (Poc), Inc. | | Oil & Gas Operator | Dec 1984 |
| 4117 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 4118 | Ross & Glenn Petroleum Inc. | | Oil & Gas Operator | Aug 1984 |
| 4119 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 4120 | Ross Prod. - Zwahlen & Raish | | Oil & Gas Operator | Sep 1998 |
| 4121 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 4122 | Ross-A. J. Hodges Ind. | | Oil & Gas Operator | Dec 1980 |
| 4123 | Roughneck L.L.C. | | Oil Operator | Jan 2025 |
| 4124 | Rouxopco LLC | | Oil Operator | Dec 2024 |
| 4125 | Rovig Minerals, Inc. | | Oil & Gas Operator | May 2020 |
| 4126 | Rowe Oil And Gas, Inc. | | Oil & Gas Operator | Jun 1999 |
| 4127 | Rowe Oil Co. | | Oil Operator | Jan 2002 |
| 4128 | Rowe, Inc. | | Oil & Gas Operator | Jun 1992 |
| 4129 | Roxanna Acadia, LLC | | Oil & Gas Operator | May 2023 |
| 4130 | Roy D. Gish | | Oil & Gas Operator | Sep 2019 |
| 4131 | Roy J. Keene, Jr. | | Oil & Gas Operator | Jul 1983 |
| 4132 | Roy M. Huffington, Inc. | | Oil & Gas Operator | Jul 1983 |
| 4133 | Roy M. Teel | | Oil & Gas Operator | Nov 1983 |
| 4134 | Royal Petroleum Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jan 2025 |
| 4135 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 4136 | Royalty Management & Dev Corp. | | Oil & Gas Operator | Apr 1998 |
| 4137 | Rozel Operating Company | | Oil & Gas Operator | Oct 2014 |
| 4138 | RPS Energy, Inc. | | Oil & Gas Operator | Jul 2020 |
| 4139 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 4140 | Ruby Breaux Gotreaux | | Oil Operator | Mar 1981 |
| 4141 | Rudman Resources, Inc. | | Oil Operator | Jul 1981 |
| 4142 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 4143 | Rusk Energy Management, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 4144 | Ruskin H Meyer Et Al | | Oil Operator | Sep 1987 |
| 4145 | Russell A. Flowers | | Oil Operator | May 1995 |
| 4146 | Russell Resources, Inc. | | Oil & Gas Operator | Dec 1998 |
| 4147 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 4148 | Rvo Petroleum Co. | | Oil & Gas Operator | Feb 1982 |
| 4149 | Ryca Energy Partners LLC | | Oil Operator | Nov 2024 |
| 4150 | Ryca Energy, LLC | | Oil & Gas Operator | Mar 2015 |
| 4151 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 4152 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Feb 2026 |
| 4153 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Feb 2026 |
| 4154 | S Enterprises | | Oil & Gas Operator | Nov 1986 |
| 4155 | S G L B Operating Company Inc | | Oil & Gas Operator | Nov 1993 |
| 4156 | S M Hammack | | Gas Operator | Feb 2003 |
| 4157 | S S M Partnership | | Oil & Gas Operator | Jul 1992 |
| 4158 | S&B Petroleum Corporation | | Oil & Gas Operator | Jun 1994 |
| 4159 | S&S Williams Inc | | Oil Operator | May 2004 |
| 4160 | S. G. Myers, Jr. | | Oil & Gas Operator | May 2005 |
| 4161 | S. G. Myers, Jr. Et Al | | Oil & Gas Operator | Jul 1991 |
| 4162 | S. Parish Oil Company, Inc. | | Oil & Gas Operator | Dec 1997 |
| 4163 | S. S. Tatum | | Oil Operator | Aug 1999 |
| 4164 | S. W. Ray, Et Al | | Oil Operator | Mar 2003 |
| 4165 | S.H. Loe Oil Corp. | | Oil & Gas Operator | Jan 2025 |
| 4166 | S2 Energy 1, LP | | Oil & Gas Operator | Nov 2012 |
| 4167 | S2 Energy Operating LLC | | Oil & Gas Operator | May 2023 |
| 4168 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 4169 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 4170 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 4171 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4172 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 4173 | Sabine Pipe, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 4174 | Sable Minerals, Inc. | | Oil & Gas Operator | Nov 1993 |
| 4175 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 4176 | Sackett Oil Company | | Oil & Gas Operator | Oct 1995 |
| 4177 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 4178 | Sahara Gas & Exploration, Inc. | | Gas Operator | Mar 2002 |
| 4179 | Saline Injection Systems Co. | | Oil Operator | Jan 2025 |
| 4180 | Sally Oil Company | | Oil Operator | Sep 2016 |
| 4181 | Sam Aertker | | Oil Operator | Jul 1992 |
| 4182 | Sam Jones & Assoc Prod Div Inc | | Oil & Gas Operator | Feb 1999 |
| 4183 | Sam Myers | | Oil & Gas Operator | Nov 1988 |
| 4184 | Sam R. Brown | | Oil Operator | Mar 1987 |
| 4185 | Sam Spears, Jr. | | Oil & Gas Operator | Sep 1998 |
| 4186 | Samantha Petroleum Corp. | | Oil & Gas Operator | Apr 1987 |
| 4187 | Samedan Oil Corp. Et Al | | Oil & Gas Operator | Jan 1989 |
| 4188 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4189 | Sammy D. Thrash | | Oil & Gas Operator | May 2012 |
| 4190 | Sammy D. Thrash, LLC | | Oil & Gas Operator | May 2019 |
| 4191 | Sample Exploration | | Oil & Gas Operator | Jul 2002 |
| 4192 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 4193 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 4194 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4195 | Samson Kelley Operating Co., LTD. | | Oil & Gas Operator | Feb 2004 |
| 4196 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 4197 | Samuel Gary Jr. & Assoc., Inc. | | Oil & Gas Operator | Mar 2023 |
| 4198 | San Miguel Oil & Gas, Inc. | | Oil & Gas Operator | Jan 1993 |
| 4199 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 4200 | Sanare Energy Partners, LLC | | Oil & Gas Operator | Dec 2024 |