| 1901 | Rvo Petroleum Co. | | Oil & Gas Operator | Feb 1982 |
| 1902 | RVR Operating Co. | Bedford, TX 76021 | Oil & Gas Operator | Jan 2017 |
| 1903 | RW Oil & Gas LLC | Lamont, OK 74643 | Oil & Gas Operator | Feb 2025 |
| 1904 | RW Oil Co | Lovington, NM BAD ADDR | Oil Operator | Nov 1994 |
| 1905 | RW Operating Corp. | Midland, TX 79702 | Oil & Gas Operator | Jul 2016 |
| 1906 | Rwa Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 1999 |
| 1907 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2025 |
| 1908 | Rwit Company Inc | Tulsa, OK 74131-4255 | Oil & Gas Operator | Jul 2018 |
| 1909 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 1910 | RWL Enterprises | | Oil & Gas Operator | Feb 2017 |
| 1911 | RWS Operating Co. LLC | Kilgore, TX 75663 | Oil Operator | Apr 2025 |
| 1912 | Ry-Co Petroleum | Wann, OK 74083-2052 | Oil & Gas Operator | Feb 2017 |
| 1913 | Ryan Exploration, Inc. | | Oil & Gas Operator | Mar 2012 |
| 1914 | Ryan Petroleum Corp | Oklahoma City, OK 73102-9024 | Oil & Gas Operator | Aug 1994 |
| 1915 | Ryan Petroleum Operating Inc | Oklahoma City, OK 73102-9024 | Oil & Gas Operator | May 1999 |
| 1916 | Ryan, Daniel J. | Oklahoma City, OK 73139 | Oil Operator | Sep 2003 |
| 1917 | Ryan, Joseph G. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 1918 | Ryan, Kristen S. | Elma, NY 14059 | Gas Operator | Dec 2023 |
| 1919 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Apr 2025 |
| 1920 | Ryca Energy Partners LLC | | Oil Operator | Nov 2024 |
| 1921 | Ryca Energy, LLC | | Oil & Gas Operator | Mar 2015 |
| 1922 | Ryder Scott Management, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2018 |
| 1923 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 1924 | Ryholland Fielder, Inc | Delray Beach, FL 33446 | Oil & Gas Operator | Apr 2025 |
| 1925 | Rystin Oil & Gas | Sugar Land, TX 77487 | Oil & Gas Operator | Apr 2025 |