| 1 | R & P Oil Co. | | Oil & Gas Operator | Jul 2014 |
| 2 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 3 | R & R Production Company | | Oil Operator | Feb 2000 |
| 4 | R & R Production, Inc. | | Oil & Gas Operator | Feb 1990 |
| 5 | R H Energy Co Inc | | Oil & Gas Operator | Sep 1989 |
| 6 | R&F Operating Company | Carthage, TX 75633 | Oil Operator | Apr 2026 |
| 7 | R. A. Bridges | | Oil Operator | Jun 1991 |
| 8 | R. C. Production | | Oil & Gas Operator | Nov 2024 |
| 9 | R. E. Markham | | Oil & Gas Operator | Mar 1995 |
| 10 | R. E. Markham Et Al | | Gas Operator | Jun 1996 |
| 11 | R. H. Davis | | Oil Operator | Apr 2001 |
| 12 | R. L. Davis | | Oil Operator | Dec 2024 |
| 13 | R. L. Dempsey | | Oil Operator | Jun 1985 |
| 14 | R. M. Hobbs | | Oil Operator | Sep 2000 |
| 15 | R. Pannell Oil Company | Kilgore, TX 75663 | Oil Operator | Jan 2025 |
| 16 | R. V. Drummond, Et Al | | Oil Operator | Nov 1999 |
| 17 | R.Chisum, Jr. & L. Shepherd | | Oil & Gas Operator | Nov 2001 |
| 18 | R.E. McDowell & Dave Gammill | | Oil Operator | May 1978 |
| 19 | Radco Energy LLC | | Oil Operator | Jan 2025 |
| 20 | Ralph L. Leaderbrand | | Oil & Gas Operator | Dec 1996 |
| 21 | Randy Wilson | | Oil Operator | Dec 2020 |
| 22 | Ransom Horne,Jr. | | Oil & Gas Operator | Dec 1991 |
| 23 | Ray Oil Company | Dallas, TX 75370 | Oil Operator | Dec 1989 |
| 24 | RBD-Shelby Agency | Dallas, TX 75283 | Oil & Gas Operator | Dec 1993 |
| 25 | RCV Investments, LLC | | Oil & Gas Operator | Jan 2025 |
| 26 | Rebel Oil Company | Keaton, KY 41226 | Oil & Gas Operator | Jan 2025 |
| 27 | Rebel Production Company | Kilgore, TX 75663 | Oil Operator | Apr 2026 |
| 28 | Red River Oil & Gas Inc. | | Oil & Gas Operator | May 2012 |
| 29 | Red Rock Production L.L.C. | | Oil Operator | Jan 2025 |
| 30 | Regal Petroleum Services, Inc. | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 31 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 32 | Regency Gas Gathrng & Proc LLC | | Oil Operator | Sep 2007 |
| 33 | Regency Intrastate Gas LLC | | Oil Operator | Feb 2009 |
| 34 | Reliant Energy Field SVS Inc. | | Oil Operator | Sep 2002 |
| 35 | Relmm Corporation | | Oil & Gas Operator | May 1980 |
| 36 | Republic Energy Resources,Inc. | | Oil Operator | May 1991 |
| 37 | Republic Gas Gathering Sys Inc | | Oil & Gas Operator | Nov 1981 |
| 38 | Resources America, Inc | | Oil Operator | Jan 1983 |
| 39 | Revel Oil & Gas, Inc. | | Oil & Gas Operator | Feb 2001 |
| 40 | Rhoads Oil, LLC | | Oil Operator | Jan 2025 |
| 41 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 42 | Rising Star Energy-Oper Co., LLC | | Oil & Gas Operator | Nov 2006 |
| 43 | Riverside Resources, Inc. | | Oil & Gas Operator | Oct 2015 |
| 44 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2026 |
| 45 | RMT Resources LLC | | Oil Operator | Jan 2025 |
| 46 | Robco Investments, Inc. | | Oil & Gas Operator | Jul 2016 |
| 47 | Robert E McDowell | | Oil Operator | Dec 1998 |
| 48 | Robert G Cox & Assoc La Inc. | | Oil & Gas Operator | Jun 1994 |
| 49 | Robert M. Mills | | Oil Operator | Oct 2017 |
| 50 | Robert S. Barnwell, III | | Oil & Gas Operator | Oct 1984 |
| 51 | Roberts Oil Corp. | | Oil & Gas Operator | Sep 1982 |
| 52 | Robie A. Bridges III | | Oil Operator | Aug 1993 |
| 53 | Rock Well Petroleum (U.S.), Inc. | Canada, 00100 | Oil & Gas Operator | Sep 2014 |
| 54 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Apr 2026 |
| 55 | Rogers Oil Co. | Bronson, KS 66716 | Oil & Gas Operator | Sep 1995 |
| 56 | Ronald E. Hall | | Oil Operator | Nov 1991 |
| 57 | Ronny N. Davis | | Oil Operator | Jan 2025 |
| 58 | Rooster Production, LLC | Oil City, LA 71061 | Oil Operator | Jan 2025 |
| 59 | Rosbottom Petroleum | | Oil & Gas Operator | Aug 1988 |
| 60 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 61 | Rose Pass Mines, Inc. | | Oil Operator | Oct 1982 |
| 62 | Ross & Glenn Petroleum Inc. | | Oil & Gas Operator | Aug 1984 |
| 63 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 64 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 65 | Rowe Oil Co. | | Oil Operator | Jan 2002 |
| 66 | Roy D. Gish | | Oil & Gas Operator | Sep 2019 |
| 67 | Royal Petroleum Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jan 2025 |