| 1101 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 1102 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Apr 2026 |
| 1103 | Sanchez-O'Brien | | Oil & Gas Operator | Dec 1984 |
| 1104 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Jun 2026 |
| 1105 | Sands-American Corp | | Oil & Gas Operator | Jan 1990 |
| 1106 | Santa Rosa Petroleum LLC | Recluse, WY 82725 | Oil & Gas Operator | Jun 2026 |
| 1107 | Sauer Bill Oil & Gas Company LLC | Casper, WY 82604 | Oil & Gas Operator | Jun 1999 |
| 1108 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 1109 | Sayers Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2005 |
| 1110 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 1111 | Scarlett Energy Enterprises LLC | Watchung, NJ 07069 | Oil & Gas Operator | Oct 2014 |
| 1112 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 1113 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | May 2026 |
| 1114 | Schlaikjer A L | | Oil Operator | Feb 1997 |
| 1115 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Sep 2026 |
| 1116 | Schneider Oil Corporation | Broomfield, CO 80020 | Oil & Gas Operator | Aug 2009 |
| 1117 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 1118 | Seahawk Oil International Inc | Newport Beach, CA 92660 | Oil & Gas Operator | Oct 1997 |
| 1119 | Seedy Draw LLC | Greenwood VIllage, CO 80111 | Oil Operator | Mar 2026 |
| 1120 | Seer Operating LLC | Sheridan, WY 82801 | Oil & Gas Operator | Oct 2016 |
| 1121 | Seguro Oil & Gas Inc | | Oil Operator | Jul 1992 |
| 1122 | Sendero Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 1123 | Seven Sisters Oil & Gas LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2022 |
| 1124 | Sgcu GP LLC | Casper, WY 82602 | Oil Operator | Jul 2026 |
| 1125 | Shar Alan Oil Company | | Oil & Gas Operator | Oct 2005 |
| 1126 | Sharkey Well Service Inc | | Oil Operator | Dec 2023 |
| 1127 | Sharples Phillip T Trust | Denver, CO 80264 | Oil & Gas Operator | Nov 2020 |
| 1128 | Shelco | Maysville, MO 64469 | Oil & Gas Operator | May 2021 |
| 1129 | Shell Rocky Mountain Production LLC | Pinedale, WY 82941 | Oil & Gas Operator | Dec 2008 |
| 1130 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 1131 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 1132 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 1133 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 1134 | Sierra Trading Corporation | | Oil & Gas Operator | Sep 1978 |
| 1135 | Signal Hill Company LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2024 |
| 1136 | Signal Hill Operating LLC | | Oil & Gas Operator | Jul 2026 |
| 1137 | Silverado Oil Inc | Greeley, CO 80631 | Oil Operator | Apr 2000 |
| 1138 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 1139 | Simon Oil LLC | Kaycee, WY 82639 | Oil Operator | Apr 2026 |
| 1140 | Simray Production Company LP | Richland, TX 75080 | Oil & Gas Operator | Dec 2010 |
| 1141 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Jul 2026 |
| 1142 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 1143 | Skinner Corporation | | Oil Operator | Apr 1985 |
| 1144 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 1145 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 1146 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2026 |
| 1147 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Feb 2026 |
| 1148 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 1149 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 1150 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 1151 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 1152 | Smith Al | Duncan, OK 73534-0037 | Oil Operator | Dec 1998 |
| 1153 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 1154 | Smith Kevin | Thermopolis, WY 82443 | Oil Operator | Sep 2024 |
| 1155 | Smith Red Plains Production LLC | | Oil & Gas Operator | Jul 2026 |
| 1156 | Smokey Oil Company Inc | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 1157 | Snowy Owl LLC | Gillette, WY 82717 | Oil & Gas Operator | Jul 2026 |
| 1158 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 1159 | Sois-Osage Inc | | Oil & Gas Operator | Oct 2006 |
| 1160 | Solar Petroleum Inc | | Oil Operator | May 1983 |
| 1161 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 1162 | Sonoma Energy Corporation | Park City, UT 84068 | Oil & Gas Operator | Feb 2010 |
| 1163 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 1164 | Sooner Operating Co Inc | Casper, WY 83602 | Oil Operator | Jul 2026 |
| 1165 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 1166 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 2026 |
| 1167 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 1168 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 1169 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 1170 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 1171 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 1172 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 1173 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 1174 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Jul 2026 |
| 1175 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 1176 | Spirit Energy Inc | Edmond, OK 73034 | Oil & Gas Operator | Apr 1999 |
| 1177 | Spring Valley Development Co LLC | Centennial, CO 80014 | Oil & Gas Operator | Jul 2026 |
| 1178 | St Michael Exploration | | Oil & Gas Operator | Jun 1987 |
| 1179 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 1180 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 1181 | Stag Oil Producers Inc | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 1182 | Stanco Petroleum Inc | Kimball, NE 69145 | Oil & Gas Operator | Jul 1999 |
| 1183 | Star Oil Operating Company, LLC | Bowling Green, KY 42101 | Oil & Gas Operator | Jul 2026 |
| 1184 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 1185 | States Exploration Inc | | Oil Operator | Jul 1985 |
| 1186 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 1187 | Stealth Energy Inc | Billings, MT 59101 | Oil Operator | Dec 2011 |
| 1188 | Stealth Energy USA Inc | Billings, MT 59104 | Oil Operator | Dec 2017 |
| 1189 | Steamboat Oil And Gas LLC | Gillette, WY 82717 | Oil Operator | Jun 2026 |
| 1190 | Stellar Oil Company | Arvada, CO 80006 | Oil & Gas Operator | Dec 1998 |
| 1191 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2026 |
| 1192 | Sterling Energy Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1995 |
| 1193 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 1194 | Stone & Wolf LLC | Sheridan, WY 82801 | Oil & Gas Operator | Dec 2006 |
| 1195 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 1196 | Stone Energy LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 1197 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 1198 | Storm Cat Energy USA Operating Corp | Denver, CO 80202 | Gas Operator | Jun 2017 |
| 1199 | Stovall Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 1998 |
| 1200 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | May 2026 |