| 901 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 902 | Reunion Resources, Inc. | | Oil & Gas Operator | Dec 2015 |
| 903 | Reunion Titan, Inc. | | Oil & Gas Operator | Jan 2017 |
| 904 | Reusch Well Service, Inc. | Ottawa, KS 66067 | Oil Operator | Dec 2019 |
| 905 | Revard Oil And Gas Properties Inc | | Oil & Gas Operator | May 2025 |
| 906 | Revard Petroleum, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2025 |
| 907 | Reveille Resources | Houston, TX 77084 | Oil & Gas Operator | Apr 2011 |
| 908 | Reveille Resources (Texas), Inc. | Houston, TX 77084 | Oil & Gas Operator | Jan 2013 |
| 909 | Revel Oil & Gas, Inc. | | Oil & Gas Operator | Feb 2001 |
| 910 | Revelation Gas & Oil Oklahoma LLC | Kansas City, KS 66103 | Oil & Gas Operator | Jul 2023 |
| 911 | Revelation Oil & Gas LLC | Dumas, TX 79029 | Oil & Gas Operator | Sep 2025 |
| 912 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | May 2025 |
| 913 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 914 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Sep 2025 |
| 915 | Revier Resources Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2005 |
| 916 | Revier, J. B. Prod. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 1996 |
| 917 | Review Oil & Gas Inc | Edmond, OK 73034-7648 | Oil & Gas Operator | May 2025 |
| 918 | Revilo Exploration LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2020 |
| 919 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 920 | Revitalize Resources Operating, Inc | Evansville, IN 47708 | Oil Operator | Dec 2023 |
| 921 | Revocable Inter VIvos Trust Of Delapp Frankie L | Bartlesville, OK 74006-0307 | Oil & Gas Operator | Feb 2020 |
| 922 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2024 |
| 923 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 924 | Rex Drummond | Conneaut, OH 44030-9678 | Oil & Gas Operator | Dec 2019 |
| 925 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 926 | Rex Energy Rockies LLC | State College, PA 16801 | Oil & Gas Operator | May 2013 |
| 927 | Rex Oil, A Texas Partnership | Hondo, TX 78861 | Oil & Gas Operator | May 2003 |
| 928 | Rexcom, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2025 |
| 929 | Rexoco Incorpora | | Oil Operator | Apr 1992 |
| 930 | Rey Oil & Gas, Inc | Oneida, TN 37841 | Oil Operator | Dec 2023 |
| 931 | Reynolds Drill Coinc/Rosbottom | | Oil & Gas Operator | Jan 1990 |
| 932 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2025 |
| 933 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2025 |
| 934 | Reynolds Exploration Co. | | Oil Operator | Dec 1986 |
| 935 | Reynolds J W & Associates | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2000 |
| 936 | Reynolds Mining Corp | | Oil & Gas Operator | Aug 1968 |
| 937 | Reynolds Oil Co. | | Oil Operator | Nov 2005 |
| 938 | Reynolds Res, Inc | Owensboro, KY 42303 | Oil & Gas Operator | Dec 2023 |
| 939 | Reynolds, Dan Company | Camden, AR 71701 | Oil Operator | Jan 2025 |
| 940 | Reynolds, E. P., Jr. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 941 | Reynolds, J David Company | Camden, AR 71701 | Oil & Gas Operator | Dec 2024 |
| 942 | Reynolds, J. C. & W. F. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2025 |
| 943 | Reynolds, Richard | Seymour, TX 76380 | Oil & Gas Operator | Mar 2008 |
| 944 | Reyrock Oil, LLC | Limestone, NY 14753 | Oil & Gas Operator | Dec 2024 |
| 945 | RF Operating And Supply Inc | | Oil & Gas Operator | Feb 2013 |
| 946 | RFB Exploration | | Oil Operator | Feb 1981 |
| 947 | Rfe Operating, LLC | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 948 | RG Exploration, LLC | Midland, TX 78705 | Oil & Gas Operator | Feb 2020 |
| 949 | RGN Company, Inc. | Stockton, KS 67669 | Oil Operator | Apr 2025 |
| 950 | RGX Energy LLC | Plano, TX 75025 | Oil & Gas Operator | Oct 2019 |
| 951 | RH Capital-Beets, LLC | Jefferson City, MO 65101 | Oil Operator | Apr 2025 |
| 952 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Sep 2025 |
| 953 | RHC Energy (USA) LLC | Houston, TX 77027 | Oil Operator | Sep 2025 |
| 954 | RHDK Oil & Gas LLC/Dba Red Hill | Dover, OH 44622-9801 | Oil & Gas Operator | Dec 2024 |
| 955 | Rhea, Andrew | Galva, KS 67443 | Oil & Gas Operator | Apr 2025 |
| 956 | Rheaco Oil Company, LTD. | Sourlake, TX 77659 | Oil Operator | Sep 2025 |
| 957 | Rheata Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 958 | Rheem Resources Inc | Wichita, KS 67220 | Oil Operator | Aug 1998 |
| 959 | Rhine Oil Co LLC | Dalton, OH 44618 | Oil & Gas Operator | Dec 1999 |
| 960 | Rhino Operating Company LLC | Brentwood, TN 37027-8760 | Oil & Gas Operator | May 2025 |
| 961 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 962 | Rhoads Brothers Oil & Gas Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 1996 |
| 963 | Rhoads Mark Operations | Ponca City, OK 74604 | Oil & Gas Operator | May 2006 |
| 964 | Rhoads Oil, LLC | | Oil Operator | Jan 2025 |
| 965 | Rhoads, Mark | Seminole, OK 74868 | Oil Operator | Sep 1999 |
| 966 | Rhoden Investment Co. | | Oil Operator | Dec 1987 |
| 967 | Rhodes Disposal, Inc. | Bryson, TX 76427 | Oil Operator | Sep 2025 |
| 968 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 969 | Rhodes Well Service | | Oil Operator | Apr 2025 |
| 970 | Rhodes-Fielding Corporation | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 971 | Rhombus Operating Co., LTD | Littleton, CO 80160 | Oil & Gas Operator | Jun 2025 |
| 972 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 973 | RHR Oil & Gas, LLC | Fort Worth, TX 76107 | Oil Operator | Sep 2025 |
| 974 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Sep 2025 |
| 975 | Ria Mia Corporation | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2011 |
| 976 | Rialto Oil & Gas Corporation | Houston, TX 77098 | Oil & Gas Operator | Oct 2012 |
| 977 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 978 | Ric Petroleum | | Gas Operator | Dec 1998 |
| 979 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 980 | Rice Drilling B LLC | Canonsburg, PA 15317-5851 | Gas Operator | Jun 2025 |
| 981 | Rice Drilling Company | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2025 |
| 982 | Rice Drilling D LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jun 2025 |
| 983 | Rice Engineering | | Oil & Gas Operator | Jul 1988 |
| 984 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 985 | Rice Michael Lee | Beggs, OK 74421-2977 | Oil Operator | Jul 2024 |
| 986 | Rice Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2020 |
| 987 | Rice Patricia Dba Rice Oil | Duncan, OK 73533-1888 | Oil Operator | Jan 2021 |
| 988 | Rice Production Company | | Oil Operator | Dec 2019 |
| 989 | Rice, James D. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2007 |
| 990 | Riceland Petroleum Company | | Oil & Gas Operator | Nov 2024 |
| 991 | Rich, Joe | | Oil Operator | Dec 2019 |
| 992 | Richard A. Williams Expl Corp. | | Oil & Gas Operator | Dec 1983 |
| 993 | Richard B Herzog | Bradford, PA 16701-3619 | Oil Operator | Dec 2007 |
| 994 | Richard B. Nelson,Etal | | Oil & Gas Operator | May 1979 |
| 995 | Richard C Sullins Credit Shelter Trust | Perry, OK 73077 | Gas Operator | Feb 2025 |
| 996 | Richard C. Bellows Family Trust | George West, TX 78022 | Oil Operator | Sep 2025 |
| 997 | Richard C. Hinds | | Oil Operator | Jan 2025 |
| 998 | Richard Charles J | | Oil & Gas Operator | May 1996 |
| 999 | Richard Engineer | | Oil Operator | Mar 1991 |
| 1000 | Richard G Boarts | Ford City, PA 16226-7001 | Gas Operator | Dec 2012 |