| 801 | OLDAKER | Sherman County, TX | Gas Property | Mar 2025 |
| 802 | OLDEN-PAULL UNIT 1 | Brazos County, TX | Oil & Gas Property | Mar 2025 |
| 803 | OLDENBURG | Fayette County, TX | Oil & Gas Property | Mar 2025 |
| 804 | OLDFIELD | Beckham County, OK | Oil & Gas Property | Feb 2025 |
| 805 | OLDHAM | Ellis County, KS | Oil Property | Aug 2024 |
| 806 | OLDHAM | Midland County, TX | Oil & Gas Property | Mar 2025 |
| 807 | OLDHAM | Pawnee County, OK | Oil & Gas Property | Oct 2024 |
| 808 | OLDHAM | Archer County, TX | Oil & Gas Property | Mar 2025 |
| 809 | OLDHAM | Petroleum County, MT | Oil Property | Jan 2015 |
| 810 | OLDHAM 1-22 | Woodward County, OK | Gas Property | Mar 2025 |
| 811 | OLDHAM IDA MAE | Midland County, TX | Oil & Gas Property | Mar 2025 |
| 812 | OLDHAM TRUST | Howard County, TX | Oil & Gas Property | Mar 2025 |
| 813 | OLDHAM-GRAHAM 35 | Midland County, TX | Oil & Gas Property | Mar 2025 |
| 814 | OLDJAMIE OIL | Atascosa County, TX | Oil & Gas Property | Mar 2025 |
| 815 | OLDLAND | Rio Blanco County, CO | Oil & Gas Property | Aug 2008 |
| 816 | OLDS | Caddo Parish, LA | Oil Property | Nov 2024 |
| 817 | OLDS ROEHR | Seward County, KS | Gas Property | Feb 2025 |
| 818 | OLDS UNIT | Weston County, WY | Oil & Gas Property | Apr 2025 |
| 819 | OLE 1-29H | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 820 | OLE 2-1-29M | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 821 | OLE 4-1-29MBH | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 822 | OLE 5-1-29TFH | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 823 | OLE 6-1-29MBH | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 824 | OLE 7-1-29TFH | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 825 | OLE 8-1-29 | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 826 | OLE 9-1-29MBH | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 827 | OLE BOE | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 828 | OLE GIESER UNIT | Tarrant County, TX | Oil & Gas Property | Mar 2025 |
| 829 | OLEA 24-11TFH | Dunn County, ND | Oil & Gas Property | Apr 2025 |
| 830 | OLEAN | Santa Barbara County, CA | Oil & Gas Property | Apr 1987 |
| 831 | OLEARY | Barton County, KS | Oil Property | Feb 2025 |
| 832 | OLEARY | Rooks County, KS | Oil Property | Feb 2025 |
| 833 | OLEBULLY 8-1-29TFH-ULW | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 834 | OLEN SLEDGE | Grady County, OK | Oil & Gas Property | Feb 2025 |
| 835 | OLENHOUSE | Wilson County, KS | Gas Property | Feb 2025 |
| 836 | OLENHOUSE | Wilson County, KS | Gas Property | Feb 2025 |
| 837 | OLENICK | Wilson County, TX | Oil & Gas Property | Mar 2025 |
| 838 | OLER THOMPSON B | Clearfield County, PA | Gas Property | Dec 2024 |
| 839 | OLES | Erie County, NY | Gas Property | Dec 2023 |
| 840 | OLEUM CORP | Collier County, FL | Oil & Gas Property | Dec 2024 |
| 841 | OLEX US | Denton County, TX | Oil & Gas Property | Mar 2025 |
| 842 | OLEXA | Fayette County, PA | Oil & Gas Property | Mar 2025 |
| 843 | OLEY 1-28 | Ness County, KS | Oil Property | Feb 2025 |
| 844 | OLEY UNIT | Lee County, TX | Oil & Gas Property | Mar 2025 |
| 845 | OLFERT | Valley County, MT | Oil & Gas Property | Feb 2019 |
| 846 | OLGA | Kearny County, KS | Gas Property | Feb 2025 |
| 847 | OLGA 150-99-15-22-1H | McKenzie County, ND | Oil & Gas Property | Apr 2025 |
| 848 | OLGA COAL | McDowell County, WV | Oil & Gas Property | Dec 2021 |
| 849 | OLGA COAL CO. 1 | McDowell County, WV | Gas Property | Dec 2021 |
| 850 | OLGA COAL CO. 1 | McDowell County, WV | Gas Property | Dec 2021 |
| 851 | OLGA H WEBER | Jefferson County, PA | Gas Property | Dec 2024 |
| 852 | OLGA MARTENS | Major County, OK | Oil & Gas Property | Dec 2017 |
| 853 | OLGUIN | La Plata County, CO | Gas Property | Mar 2025 |
| 854 | OLIFANT UNIVERSITY 25 18 | Ward County, TX | Oil & Gas Property | Mar 2025 |
| 855 | OLIFANT UNIVERSITY 38 18 | Ward County, TX | Oil & Gas Property | Mar 2025 |
| 856 | OLIG CRUDE | Kern County, CA | Oil Property | Sep 2007 |
| 857 | OLIGER | Conway County, AR | Gas Property | Jul 2024 |
| 858 | OLIKTOK P | Beechey Point Quadrangle, AK | Oil & Gas Property | Oct 2011 |
| 859 | OLIN | Union County, AR | Oil Property | Jan 2023 |
| 860 | OLIN | Sabine Parish, LA | Oil & Gas Property | Oct 2024 |
| 861 | OLIN | Union County, AR | Oil & Gas Property | Sep 2024 |
| 862 | OLIN | Weld County, CO | Oil & Gas Property | May 2020 |
| 863 | OLIN | Weld County, CO | Oil & Gas Property | Jun 2019 |
| 864 | OLIN | Union Parish, LA | Gas Property | Nov 2024 |
| 865 | OLIN | Union County, AR | Oil & Gas Property | Jan 2025 |
| 866 | OLIN | Union Parish, LA | Gas Property | Dec 2010 |
| 867 | OLIN CORPORATION | Meade County, KY | Gas Property | Dec 2018 |
| 868 | OLIN FEE | Union County, AR | Oil Property | Mar 2025 |
| 869 | OLIN GAS TRANS | Union Parish, LA | Gas Property | Nov 2024 |
| 870 | OLIN GAS TRANSMISSION | Union Parish, LA | Gas Property | Dec 2024 |
| 871 | OLIN HA | Weld County, CO | Oil & Gas Property | Apr 2017 |
| 872 | OLIN INDUSTRIES | Panola County, TX | Oil & Gas Property | Feb 2025 |
| 873 | OLIN INDUSTRIES | Union Parish, LA | Gas Property | Nov 2024 |
| 874 | OLIN MATH | Union Parish, LA | Gas Property | Dec 2024 |
| 875 | OLIN MATH | Union Parish, LA | Gas Property | Dec 2000 |
| 876 | OLIN MATH | Union Parish, LA | Gas Property | Dec 2024 |
| 877 | OLIN MATH | Union Parish, LA | Gas Property | Sep 2012 |
| 878 | OLIN STATE | Weld County, CO | Oil & Gas Property | Nov 2019 |
| 879 | OLIN-BROWN | Caldwell Parish, LA | Oil & Gas Property | Aug 2023 |
| 880 | OLIN-INTERNATIONAL PAPER COMPANY | Lafayette County, AR | Oil & Gas Property | Feb 2025 |
| 881 | OLIN-IPCO | Lafayette County, AR | Oil Property | Oct 1996 |
| 882 | OLINDA | Orange County, CA | Oil & Gas Property | Mar 2025 |
| 883 | OLINDA F | Orange County, CA | Oil & Gas Property | Mar 2025 |
| 884 | OLINGER | Coffey County, KS | Oil Property | Feb 2025 |
| 885 | OLINGER | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 886 | OLINGER, RALPH | Adair County, KY | Oil Property | Sep 2013 |
| 887 | OLINICK | Karnes County, TX | Oil & Gas Property | Mar 2025 |
| 888 | OLINKRAFT | De Soto Parish, LA | Oil & Gas Property | Dec 2024 |
| 889 | OLINKRAFT | Union Parish, LA | Gas Property | Jan 2017 |
| 890 | OLINKRAFT | Ouachita Parish, LA | Oil & Gas Property | Jun 2019 |
| 891 | OLINKRAFT | Union Parish, LA | Gas Property | Nov 2024 |
| 892 | OLINKRAFT | Union Parish, LA | Gas Property | Jul 2024 |
| 893 | OLINKRAFT | Union Parish, LA | Gas Property | Dec 2000 |
| 894 | OLINKRAFT | Union Parish, LA | Gas Property | Nov 2024 |
| 895 | OLIPHANT | Hughes County, OK | Oil & Gas Property | Mar 2022 |
| 896 | OLIPHANT | Hodgeman County, KS | Oil Property | Jan 2025 |
| 897 | OLIPHANT | Montague County, TX | Oil & Gas Property | Mar 2025 |
| 898 | OLIVARES A | Starr County, TX | Oil & Gas Property | Mar 2025 |
| 899 | OLIVAREZ | Hidalgo County, TX | Oil & Gas Property | Mar 2025 |
| 900 | OLIVAREZ M.L. ETAL GAS UNIT | Hidalgo County, TX | Oil & Gas Property | Mar 2025 |