| 18001 | C. S. CARPENTER | Stevens County, KS | Gas Property | Dec 2025 |
| 18002 | C. S. HIGH 1 | Seward County, KS | Gas Property | Dec 2025 |
| 18003 | C. S. NORTON | Finney County, KS | Gas Property | Dec 2025 |
| 18004 | C. S. UNDERWOOD | Greenwood County, KS | Oil Property | Sep 2022 |
| 18005 | C. SMITH | Montgomery County, KS | Oil & Gas Property | Jun 2020 |
| 18006 | C. SOLBERG | Sheridan County, MT | Oil & Gas Property | Feb 2026 |
| 18007 | C. TUCKER | Montgomery County, KS | Gas Property | Dec 2025 |
| 18008 | C. W. A 14 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18009 | C. W. A 2 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18010 | C. W. A 3 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18011 | C. W. B 18 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18012 | C. W. B 2 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18013 | C. W. B 3 | Wise County, TX | Oil & Gas Property | Jan 2026 |
| 18014 | C. W. LOGSDON -A | Andrews County, TX | Oil & Gas Property | Feb 2026 |
| 18015 | C. WELLS | Ashland County, OH | Oil & Gas Property | Dec 2025 |
| 18016 | C. WINGER | Stanton County, KS | Gas Property | Dec 2025 |
| 18017 | C. WINNEY | Payne County, OK | Oil & Gas Property | Jan 2026 |
| 18018 | C.A. 2820 | Woods County, OK | Oil & Gas Property | Jan 2026 |
| 18019 | C.A. DYER-PUMA | Newton County, TX | Oil & Gas Property | Feb 2026 |
| 18020 | C.A. WEST ESTATE | Westmoreland County, PA | Gas Property | Dec 2025 |
| 18021 | C.B. MORGAN | Choctaw County, AL | Oil Property | Aug 1978 |
| 18022 | C.B. STODDARD | Colusa County, CA | Gas Property | Feb 2012 |
| 18023 | C.C. CARTER | Hughes County, OK | Gas Property | Jan 2026 |
| 18024 | C.C. CITIES SERVICE | Andrews County, TX | Oil & Gas Property | Feb 2026 |
| 18025 | C.C. CURTIS | Athens County, OH | Oil & Gas Property | Dec 2024 |
| 18026 | C.C. LOCKHART & BROWN | Andrews County, TX | Oil & Gas Property | Feb 2026 |
| 18027 | C.C. NIX-FUHRMAN | Andrews County, TX | Oil & Gas Property | Feb 2026 |
| 18028 | C.C.CHERRY | Pottawatomie County, OK | Oil Property | Feb 2026 |
| 18029 | C.C.M.O | Kern County, CA | Oil & Gas Property | Aug 1984 |
| 18030 | C.C.M.O | Kings County, CA | Oil & Gas Property | Aug 2024 |
| 18031 | C.D.M. A COM | Eddy County, NM | Oil & Gas Property | Feb 2026 |
| 18032 | C.D.SMITH | Carter County, OK | Oil Property | Jun 2021 |
| 18033 | C.D.U. 'A' | Yoakum County, TX | Oil & Gas Property | Feb 2026 |
| 18034 | C.E. CALVERT | Stanton County, KS | Gas Property | Dec 2025 |
| 18035 | C.E. HEARD B | Bee County, TX | Oil & Gas Property | Feb 2026 |
| 18036 | C.E. SMITH | Washington County, PA | Oil Property | Dec 2025 |
| 18037 | C.E. STROH 4A MBH-ULW | Dunn County, ND | Oil & Gas Property | Feb 2026 |
| 18038 | C.G. HOOKS ET AL | Harris County, TX | Gas Property | Feb 2026 |
| 18039 | C.G. LUDEMAN B | Loving County, TX | Oil & Gas Property | Feb 2026 |
| 18040 | C.H. BINNEY | Grant County, KS | Gas Property | Dec 2025 |
| 18041 | C.H. ESSE UNIT | Live Oak County, TX | Oil & Gas Property | Feb 2026 |
| 18042 | C.H. KNIGHT | Reeves County, TX | Oil & Gas Property | Feb 2026 |
| 18043 | C.H. RAMIREZ MINERALS LTD | Webb County, TX | Oil & Gas Property | Dec 2025 |
| 18044 | C.H. TAYLOR UNIT A | Live Oak County, TX | Oil & Gas Property | Feb 2026 |
| 18045 | C.J. IVERSON | Liberty County, MT | Oil & Gas Property | Dec 2025 |
| 18046 | C.J.RICKER ESTATE | Haskell County, KS | Gas Property | Dec 2025 |
| 18047 | C.M. ABNEY A HV UNIT | Harrison County, TX | Oil & Gas Property | Feb 2026 |
| 18048 | C.M. HALL A 2 | Starr County, TX | Oil & Gas Property | Feb 2026 |
| 18049 | C.M. RACKEL | Milam County, TX | Oil & Gas Property | Dec 2025 |
| 18050 | C.N. KING | Grant County, KS | Gas Property | Dec 2025 |
| 18051 | C.NOBLE | Payne County, OK | Oil Property | Dec 2024 |
| 18052 | C.O. & W.H. OSWELL #3 | Baldwin County, AL | Oil Property | Jan 2026 |
| 18053 | C.O. 34-20H | Dunn County, ND | Oil & Gas Property | Feb 2026 |
| 18054 | C.O. MCELROY | Ashtabula County, OH | Oil & Gas Property | Dec 1990 |
| 18055 | C.O. OSWELL | Baldwin County, AL | Oil Property | Oct 2023 |
| 18056 | C.O.BURK | Pontotoc County, OK | Oil Property | Jan 2026 |
| 18057 | C.O.P. TRACT 25 | Centre County, PA | Oil & Gas Property | Dec 2025 |
| 18058 | C.P. CLAYTON | Palo Pinto County, TX | Oil & Gas Property | Feb 2021 |
| 18059 | C.P. DICKERSON | Henderson County, TX | Oil & Gas Property | Feb 2026 |
| 18060 | C.P. NEWMAN | Mobile County, AL | Oil & Gas Property | Nov 2008 |
| 18061 | C.PFEIL-C.KELLNER-C.HUMMEL PSA | Atascosa County, TX | Oil & Gas Property | Feb 2026 |
| 18062 | C.R. JR. & A.H. HAGEDORN HEAVEN HILL | Marshall County, WV | Oil & Gas Property | Dec 2021 |
| 18063 | C.S.-STATE | Ward County, TX | Oil & Gas Property | Mar 2021 |
| 18064 | C.S.O. 1 | Los Angeles County, CA | Oil & Gas Property | Aug 1989 |
| 18065 | C.S.O. 2 | Los Angeles County, CA | Oil & Gas Property | Aug 1989 |
| 18066 | C.V.G.S | Colusa County, CA | Gas Property | Mar 2026 |
| 18067 | C.V.MOORE | Tarrant County, TX | Oil & Gas Property | Feb 2026 |
| 18068 | C.W. HAHN UNIT A | Dewitt County, TX | Oil & Gas Property | Feb 2026 |
| 18069 | C.W. MCCONAUGHEY JR & HEIRS | Indiana County, PA | Gas Property | Dec 2025 |
| 18070 | C.W.O.D | Los Angeles County, CA | Oil & Gas Property | Feb 2026 |
| 18071 | C4 RANCH | La Salle County, TX | Oil & Gas Property | Feb 2026 |
| 18072 | CA 8 | Montezuma County, CO | Oil & Gas Property | Jan 2026 |
| 18073 | CA C 158-93-21-23 | Mountrail County, ND | Oil & Gas Property | Feb 2026 |
| 18074 | CA S 158-93-21-23 | Mountrail County, ND | Oil & Gas Property | Feb 2026 |
| 18075 | CA-ANDERSON SMITH | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18076 | CA-E BURDICK | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18077 | CA-FERGUSON SMITH | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18078 | CA-HALVERSON 154-95-0409H | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18079 | CA-RUSSELL SMITH- 155-96-2425H | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18080 | CA-STANGELAND-155-95- 2128H | Williams County, ND | Oil & Gas Property | Feb 2026 |
| 18081 | CAB -A | Gray County, TX | Oil & Gas Property | Feb 2026 |
| 18082 | CAB HUGHES | Pittsburg County, OK | Gas Property | Jan 2026 |
| 18083 | CABALLO | Campbell County, WY | Gas Property | Nov 2008 |
| 18084 | CABALLO | Campbell County, WY | Gas Property | Mar 2007 |
| 18085 | CABALLO | Campbell County, WY | Gas Property | May 2011 |
| 18086 | CABALLO | Campbell County, WY | Gas Property | Jul 2005 |
| 18087 | CABALLO | Campbell County, WY | Gas Property | Jul 2011 |
| 18088 | CABALLO | Brazos County, TX | Oil & Gas Property | Jan 2026 |
| 18089 | CABALLO | San Juan County, UT | Oil & Gas Property | May 2011 |
| 18090 | CABALLO | Campbell County, WY | Oil & Gas Property | Oct 2025 |
| 18091 | CABALLO 23 FEDERAL | Lea County, NM | Oil & Gas Property | Feb 2026 |
| 18092 | CABALLO AZUL 28-33 | Dawson County, TX | Oil & Gas Property | Feb 2026 |
| 18093 | CABALLO COAL FEDERAL | Campbell County, WY | Gas Property | Dec 2006 |
| 18094 | CABE | Lafayette County, AR | Oil Property | Mar 1971 |
| 18095 | CABE TROY | Hemphill County, TX | Oil & Gas Property | Jan 2026 |
| 18096 | CABEEN | Pecos County, TX | Oil & Gas Property | Oct 2025 |
| 18097 | CABELL, ALBERT | Logan County, WV | Gas Property | Dec 2021 |
| 18098 | CABERNET | Blaine County, OK | Oil & Gas Property | Jan 2026 |
| 18099 | CABERNET | Martin County, TX | Oil & Gas Property | Feb 2026 |
| 18100 | CABEZON | Webb County, TX | Oil & Gas Property | Feb 2026 |