| 101 | Scambler Energy Group LTD Co | Colony, OK 73021 | Oil & Gas Operator | Feb 2026 |
| 102 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 103 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 104 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 105 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 106 | Scavenger Oil Company Inc | Englewood, CO 80111 | Oil & Gas Operator | Mar 2000 |
| 107 | Schad Jeffrey M | Mannford, OK 74044-0995 | Oil Operator | Sep 2021 |
| 108 | Schettler William D | Fletcher, OK 73541-4117 | Oil & Gas Operator | Oct 2021 |
| 109 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 110 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 111 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | May 2026 |
| 112 | Schonfield Harold Gene | Bristow, OK 74010 | Oil Operator | Mar 2015 |
| 113 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 114 | Schooley Keith A | Enid, OK 73702-0767 | Oil Operator | May 2006 |
| 115 | Schrader Lawayne | Fort Worth, TX 76135 | Oil Operator | Mar 2019 |
| 116 | Schroeder, Donald C | | Oil & Gas Operator | Feb 2026 |
| 117 | Schuler Jr Chris C | Cleveland, OK 74020 | Oil Operator | Aug 2013 |
| 118 | Schuler Oil Properties LLC | Cleveland, OK 74020 | Oil Operator | Jan 2026 |
| 119 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Jan 2026 |
| 120 | Scissortail Exploration & Production, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2026 |
| 121 | Scoggins Production Company | Cleo Springs, OK 73729-9732 | Oil & Gas Operator | May 2022 |
| 122 | Scoggins Production LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Feb 2026 |
| 123 | Scott Banes Scott Family Partnership | | Oil Operator | Nov 2025 |
| 124 | Scott John S | Copan, OK 74022-5904 | Oil Operator | Apr 2005 |
| 125 | Scott Petroleum, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 1995 |
| 126 | Scott SR Kermit | Okarche, OK 73762 | Oil & Gas Operator | Mar 2015 |
| 127 | Scott Wayne Oil Co | Haxton, CO 80731 | Oil & Gas Operator | Apr 2020 |
| 128 | Scout Energy Corporation | Edmond, OK 73083-1348 | Oil & Gas Operator | Jan 2026 |
| 129 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2026 |
| 130 | SCS Newton Oil LLC | Perryton, TX 79070 | Oil & Gas Operator | May 2026 |
| 131 | Seaboard Gas Company | Edmond, OK 73034 | Oil & Gas Operator | Feb 1999 |
| 132 | Seagrove Resources LLC | Malakoff, TX 75148 | Oil & Gas Operator | Jan 2026 |
| 133 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 134 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 135 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 136 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 137 | Seahawk Oil International Inc | Newport Beach, CA 92660 | Oil & Gas Operator | Oct 1997 |
| 138 | Seal Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2006 |
| 139 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 140 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 141 | Sean M Sharp LLC | Chalk Hill, PA 15421 | Oil & Gas Operator | Oct 2025 |
| 142 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Jan 2026 |
| 143 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 144 | Searcy Brothers Inc | Tulsa, OK 74135-0433 | Oil Operator | Jun 2004 |
| 145 | Sears Joe M | Bethany, OK 730084841 | Oil & Gas Operator | May 2013 |
| 146 | Sears M N | Oklahoma City, OK 73143 | Oil & Gas Operator | Apr 2015 |
| 147 | Seay Dennis Regan | | Oil Operator | Jan 2001 |
| 148 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Feb 2026 |
| 149 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 150 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2026 |
| 151 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 152 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | Feb 2026 |
| 153 | Select Exploration Group LLC | Eufaula, OK 74432 | Oil & Gas Operator | May 2024 |
| 154 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 155 | Select Water Solutions, LLC | Gainesville, TX 76240 | Oil Operator | Jan 2026 |
| 156 | Sell Drilling LLC | | Oil Operator | Feb 2011 |
| 157 | Sell Well Servicing Company Osage Only | | Oil & Gas Operator | Nov 2019 |
| 158 | Sell, David E | | Oil Operator | Feb 2026 |
| 159 | Sellers Donald J | Depew, OK 74028-2442 | Oil Operator | Jan 2013 |
| 160 | Sellers Jack B Estate Of | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2026 |
| 161 | Sellers Mark A | Drumright, OK 74030 | Oil & Gas Operator | Mar 2020 |
| 162 | Sellers O N | Henryetta, OK 74437 | Oil & Gas Operator | May 1997 |
| 163 | Sellmeyer Eugene | Collinsville, OK 74021 | Oil & Gas Operator | Mar 2015 |
| 164 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 165 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 166 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 167 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Jan 2026 |
| 168 | Semper Fidelis Oil & Gas, LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2013 |
| 169 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Feb 2026 |
| 170 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 171 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 172 | Senico Production Company | Irving, TX 75016-5229 | Oil & Gas Operator | Mar 2002 |
| 173 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 174 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 175 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2026 |
| 176 | Serendipity Operating LLC | Sparks, NV 89436-9328 | Oil & Gas Operator | Jan 2026 |
| 177 | Serendipity Production Company LC | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2020 |
| 178 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | May 2026 |
| 179 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 180 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 181 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 182 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 183 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 184 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 185 | Seven Horses LLC | Alva, OK 73717-5004 | Oil & Gas Operator | Feb 2026 |
| 186 | Seven J Oil Inc | Jenning, OK 74038-9729 | Oil & Gas Operator | Sep 2025 |
| 187 | Seventh Corporation The | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2006 |
| 188 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 189 | Seymour Oil Co Inc | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 190 | SGP Management LLC | Dallas, TX 75206 | Oil Operator | Jan 2026 |
| 191 | Shadow-Del Oil Company | Kiefer, OK 74041-0453 | Oil & Gas Operator | Jul 2015 |
| 192 | Shadowpeak Operating LLC | Oklahoma City, OK 73159-6905 | Oil & Gas Operator | Jan 2026 |
| 193 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jan 2026 |
| 194 | Shale Properties LLC | Kingfisher, OK 73750 | Oil Operator | Aug 2023 |
| 195 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 196 | Shamrock Operating Company LLC | Cleveland, OK 74020 | Oil Operator | Aug 2022 |
| 197 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Feb 2026 |
| 198 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | Jan 2026 |
| 199 | Shanks Robert "Bob" | Haskell, OK 74436-8809 | Oil & Gas Operator | Jun 2023 |
| 200 | Shannon Corporation Inc | Okmulgee, OK 74447-1323 | Oil & Gas Operator | Mar 2015 |