| 27101 | CORWIN | Major County, OK | Oil & Gas Property | Oct 2025 |
| 27102 | CORWIN 1-34H | Kingfisher County, OK | Oil & Gas Property | Oct 2025 |
| 27103 | CORY | Elk County, KS | Oil Property | Sep 2025 |
| 27104 | CORY JACK 33-7-11 2 | La Plata County, CO | Gas Property | Oct 2025 |
| 27105 | CORYELL | Harper County, KS | Oil & Gas Property | Sep 2025 |
| 27106 | COSBY | Grady County, OK | Oil & Gas Property | Oct 2025 |
| 27107 | COSDEN DERDEYN | Garvin County, OK | Oil Property | Jul 2025 |
| 27108 | COSEKA | Washakie County, WY | Oil & Gas Property | Apr 2024 |
| 27109 | COSENS | Tuscola County, MI | Oil Property | Dec 2025 |
| 27110 | COSEY | Caldwell County, TX | Oil & Gas Property | Nov 2025 |
| 27111 | COSGRAY | Greene County, PA | Gas Property | Nov 2025 |
| 27112 | COSGROVE | Coal County, OK | Gas Property | Oct 2025 |
| 27113 | COSGROVE | Seward County, KS | Oil & Gas Property | Mar 2025 |
| 27114 | COSH MILL CREEK A-1 | Coshocton County, OH | Oil & Gas Property | Sep 2025 |
| 27115 | COSHOCTON COUNTY AIRPORT AUTHORITY | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 27116 | COSMED UNIT ZAV | Zavala County, TX | Oil & Gas Property | Nov 2025 |
| 27117 | COSMO 1 | Duchesne County, UT | Oil & Gas Property | Nov 2025 |
| 27118 | COSMO 8 STATE | Lea County, NM | Oil & Gas Property | Nov 2025 |
| 27119 | COSMO DALTEX UNIT 45-4 | Reeves County, TX | Oil & Gas Property | Nov 2025 |
| 27120 | COSMO K 24S35E3328 FEE | Lea County, NM | Oil & Gas Property | Nov 2025 |
| 27121 | COSMONAUT | Fort Bend County, TX | Oil & Gas Property | Nov 2025 |
| 27122 | COSNER | Campbell County, WY | Oil & Gas Property | Nov 2025 |
| 27123 | COSNER | Campbell County, WY | Oil & Gas Property | Nov 2025 |
| 27124 | COSNER | Susquehanna County, PA | Gas Property | Nov 2025 |
| 27125 | COSNER 11S | Campbell County, WY | Gas Property | Aug 2009 |
| 27126 | COSPER | Midland County, TX | Oil & Gas Property | Nov 2025 |
| 27127 | COSPER | Coal County, OK | Gas Property | Oct 2025 |
| 27128 | COSS | Mercer County, PA | Gas Property | Dec 2024 |
| 27129 | COSSATOT | Lea County, NM | Oil & Gas Property | Nov 2025 |
| 27130 | COSSEY | Caddo County, OK | Oil Property | Nov 2024 |
| 27131 | COSSLER, HOMER | Daviess County, KY | Oil Property | Nov 2022 |
| 27132 | COSSLETT | Weld County, CO | Oil & Gas Property | Oct 2025 |
| 27133 | COSSLETT | Weld County, CO | Oil & Gas Property | Oct 2025 |
| 27134 | COSSLETT EAST FEDERAL 1A-22H-H168 | Weld County, CO | Oil & Gas Property | Oct 2025 |
| 27135 | COSSLETT HEIRS UU | Weld County, CO | Oil & Gas Property | Apr 2019 |
| 27136 | COSSON | Freestone County, TX | Oil & Gas Property | Nov 2025 |
| 27137 | COSSON GAS UNIT | Freestone County, TX | Oil & Gas Property | Nov 2025 |
| 27138 | COSTA | San Mateo County, CA | Oil & Gas Property | Dec 2014 |
| 27139 | COSTANZA | Howard County, TX | Oil & Gas Property | Nov 2025 |
| 27140 | COSTANZA 2 | McKenzie County, ND | Oil & Gas Property | Nov 2025 |
| 27141 | COSTANZO | Dickens County, TX | Oil & Gas Property | Nov 2025 |
| 27142 | COSTANZO | Summit County, OH | Oil & Gas Property | Dec 1994 |
| 27143 | COSTANZO UNIT | Washington County, PA | Oil & Gas Property | Nov 2025 |
| 27144 | COSTELLO | Palo Pinto County, TX | Oil & Gas Property | Nov 2025 |
| 27145 | COSTELLO | Carter County, OK | Oil Property | Oct 2025 |
| 27146 | COSTELLO 16 | Potter County, PA | Gas Property | Dec 2000 |
| 27147 | COSTELLO 1H-30 | Hughes County, OK | Gas Property | Oct 2025 |
| 27148 | COSTELLO 2 | Coal County, OK | Gas Property | Nov 2025 |
| 27149 | COSTEN | Allegan County, MI | Oil Property | Aug 2025 |
| 27150 | COSTIGAN | Weld County, CO | Oil & Gas Property | Feb 2023 |
| 27151 | COSTILLA MABEE | Andrews County, TX | Oil & Gas Property | Nov 2025 |
| 27152 | COSTILOW | Latimer County, OK | Gas Property | Nov 2025 |
| 27153 | COSTILOW, DONALD L | Ritchie County, WV | Oil & Gas Property | Dec 2021 |
| 27154 | COSTILOW, EARNEST | Doddridge County, WV | Oil & Gas Property | Dec 2021 |
| 27155 | COSTLOW | Dewitt County, TX | Oil & Gas Property | Nov 2025 |
| 27156 | COT EAST | Weld County, CO | Oil & Gas Property | Oct 2025 |
| 27157 | COT WEST | Weld County, CO | Oil & Gas Property | Oct 2025 |
| 27158 | COTCHA | Seminole County, OK | Oil Property | Sep 2025 |
| 27159 | COTHAM | Payne County, OK | Oil & Gas Property | Oct 2025 |
| 27160 | COTHERN 1 | Logan County, OK | Oil & Gas Property | Sep 2025 |
| 27161 | COTHES | Andrews County, TX | Oil & Gas Property | Nov 2025 |
| 27162 | COTHREN UNIT | Wise County, TX | Oil & Gas Property | Nov 2025 |
| 27163 | COTIGA DEV | Mingo County, WV | Oil & Gas Property | Dec 2021 |
| 27164 | COTIGA DEV. CO | Mingo County, WV | Gas Property | Dec 2021 |
| 27165 | COTIGA DEVEL | Mingo County, WV | Oil & Gas Property | Dec 2021 |
| 27166 | COTIGA DEVELOPMENT C | Mingo County, WV | Gas Property | Nov 2008 |
| 27167 | COTIGA DEVELOPMENT CO | Mingo County, WV | Gas Property | Dec 2021 |
| 27168 | COTIGA LIMITED PART | Mingo County, WV | Oil & Gas Property | Dec 2021 |
| 27169 | COTIGA LTD P | Mingo County, WV | Oil & Gas Property | Dec 2021 |
| 27170 | COTINGA | Custer County, OK | Oil & Gas Property | Oct 2025 |
| 27171 | COTNER | Grady County, OK | Oil & Gas Property | Oct 2025 |
| 27172 | COTNER 35-14 | Garfield County, CO | Oil & Gas Property | Oct 2025 |
| 27173 | COTRONE-JEWISH WELFARE UNIT | Burleson County, TX | Oil & Gas Property | Oct 2025 |
| 27174 | COTROPIA-FERRARA UNIT | Robertson County, TX | Oil & Gas Property | Oct 2025 |
| 27175 | COTROPIA-MCCRADY UNIT | Robertson County, TX | Oil & Gas Property | Oct 2025 |
| 27176 | COTROPIA-PERRONE UNIT | Robertson County, TX | Oil & Gas Property | Oct 2025 |
| 27177 | COTSWOLD | Bienville Parish, LA | Gas Property | Dec 2024 |
| 27178 | COTT | Marion County, KS | Gas Property | Nov 2023 |
| 27179 | COTT | Stevens County, KS | Gas Property | Sep 2025 |
| 27180 | COTTEN | Glasscock County, TX | Oil & Gas Property | Mar 2019 |
| 27181 | COTTER 1 | Barton County, KS | Oil Property | Sep 2025 |
| 27182 | COTTER 2015 | Major County, OK | Oil & Gas Property | Nov 2025 |
| 27183 | COTTER G | Hansford County, TX | Oil & Gas Property | Mar 2017 |
| 27184 | COTTERILL | Montgomery County, KS | Oil & Gas Property | Sep 2025 |
| 27185 | COTTERMAN | Ashtabula County, OH | Oil & Gas Property | Dec 2017 |
| 27186 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 2024 |
| 27187 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 1988 |
| 27188 | COTTERMAN | Perry County, OH | Oil & Gas Property | Dec 2024 |
| 27189 | COTTINGHAM | Union County, KY | Oil Property | Dec 2022 |
| 27190 | COTTINGHAM | Webster County, KY | Oil Property | Dec 2023 |
| 27191 | COTTINGHAM | Henderson County, KY | Oil Property | Dec 2014 |
| 27192 | COTTLE | Shackelford County, TX | Oil & Gas Property | Nov 2025 |
| 27193 | COTTLE 5892 21-30 | Mountrail County, ND | Oil & Gas Property | Nov 2025 |
| 27194 | COTTLE-REEVES UNIT | Panola County, TX | Oil & Gas Property | Nov 2025 |
| 27195 | COTTMAN | Kay County, OK | Oil & Gas Property | Apr 2019 |
| 27196 | COTTOM | Major County, OK | Oil & Gas Property | Oct 2025 |
| 27197 | COTTOM | Wichita County, TX | Oil & Gas Property | Oct 2025 |
| 27198 | COTTON | Roger Mills County, OK | Oil & Gas Property | Oct 2025 |
| 27199 | COTTON | Weston County, WY | Oil Property | Aug 2022 |
| 27200 | COTTON | Eastland County, TX | Oil & Gas Property | Aug 2015 |