| 1 | Rael Resources LLC | Cowley, WY 82420 | Oil Operator | Aug 2025 |
| 2 | Rainbow Oil Company | | Oil & Gas Operator | Aug 1999 |
| 3 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 4 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 5 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Aug 2025 |
| 6 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2025 |
| 7 | Ranger Holdings Co | | Oil & Gas Operator | Jul 1993 |
| 8 | Rangeview Resources Operating Co | | Oil & Gas Operator | Jul 2025 |
| 9 | Rathbun Roger | | Oil & Gas Operator | Dec 1993 |
| 10 | Rathpro Inc | Douglas, WY 82633 | Oil & Gas Operator | Feb 1994 |
| 11 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 12 | RDG Oil & Gas LLC | Post Falls, ID 82854 | Oil & Gas Operator | Mar 2017 |
| 13 | Reading & Bates Petroleum | | Oil & Gas Operator | Apr 1989 |
| 14 | Red River Oil & Gas LLC | Cherry Hills, CO 80110 | Oil & Gas Operator | Feb 2025 |
| 15 | Red Tiger Oil & Gas LLC | Gillette, WY 82718 | Oil & Gas Operator | Jul 2025 |
| 16 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 17 | Redstone Gas Partners LLC | Denver, CO 80202 | Gas Operator | Mar 2001 |
| 18 | Redstone Resources Inc | Newcastle, WY 82701 | Gas Operator | Dec 2010 |
| 19 | Reef Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2007 |
| 20 | Reliance Resources Inc | Houston, TX 77007 | Gas Operator | Jun 2012 |
| 21 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Aug 2025 |
| 22 | Renor Exploration | Englewood, CO 80111 | Oil Operator | Feb 2001 |
| 23 | Renos Land & Minerals Company | Casper, WY 82601 | Oil & Gas Operator | Oct 2021 |
| 24 | Reserve Oil & Gas Company | | Oil & Gas Operator | Jul 1981 |
| 25 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Oct 2025 |
| 26 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 27 | Resource Enterprises Inc | Salt Lake City, UT 84108 | Gas Operator | Dec 1990 |
| 28 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 29 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 30 | Rex Energy Rockies LLC | State College, PA 16801 | Oil & Gas Operator | May 2013 |
| 31 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 32 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 33 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jul 2025 |
| 34 | Ridge Energy Partners LLC | Casper, WY 82601 | Oil Operator | Dec 2018 |
| 35 | Ridgeland Wyoming Inc | | Oil Operator | Dec 2014 |
| 36 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 37 | Rio Blanco Energy, Inc. | Littleton, CO 80121 | Oil & Gas Operator | Oct 2002 |
| 38 | River City Resources Inc | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 39 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 40 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Oct 2025 |
| 41 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 42 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Jul 2025 |
| 43 | Rochelle Oil & Gas | Gillette, WY 82717 | Oil & Gas Operator | Mar 2024 |
| 44 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 45 | Rock Oil Corporation | Lawrence, KS 66046 | Oil Operator | Oct 2004 |
| 46 | Rock River Operating Inc | Laramie, WY 82070 | Oil & Gas Operator | Jun 2025 |
| 47 | Rockies Resources Holdings LLC | Lakewood, CO 80228 | Oil & Gas Operator | Jul 2025 |
| 48 | Rocky Mountain Gas Inc | Sheridan, WY 82801 | Gas Operator | Nov 2009 |
| 49 | Rocky Mountain Operating Co Inc | Littleton, CO 80121 | Oil & Gas Operator | Dec 2011 |
| 50 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 51 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 52 | Ronadero Company Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1996 |
| 53 | Rosa Petroleum | Evansville, WY 82636 | Oil Operator | Dec 1995 |
| 54 | Royal Oil LLC | Flower Mound, TX 75028 | Oil Operator | Dec 2015 |
| 55 | Royal Resources Exploration | | Oil & Gas Operator | Mar 1984 |
| 56 | Ruby Drilling Company Inc | Gillette, WY 82718 | Oil Operator | Oct 2007 |