| 1 | R & N Oil Company | Fairfax, OK 74637 | Oil & Gas Operator | May 2013 |
| 2 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 3 | R & R Operating | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2004 |
| 4 | R B Energy, Inc | Manchester, KY 40962 | Oil & Gas Operator | Jan 2015 |
| 5 | R C Oil Company Inc | Nowata, OK 74048-3402 | Oil Operator | Nov 2021 |
| 6 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 7 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 8 | R L Turner Oil Company LLC | Duncan, OK 73533 | Oil Operator | Feb 2024 |
| 9 | Rainbow Oil & Gas | Pawhuska, OK 74056-0056 | Oil Operator | Oct 2010 |
| 10 | Rainbow Oil & Gas LLC | Coolville, OH 45723 | Oil & Gas Operator | May 2023 |
| 11 | Rainbow Oil Company | | Oil & Gas Operator | Aug 1999 |
| 12 | Rainbow Oilwell Service Inc | Depew, OK 74028-0087 | Oil & Gas Operator | Mar 2023 |
| 13 | Ralph Dawson | | Oil Operator | Nov 2005 |
| 14 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 15 | Rawhide Operating, Inc. | New Braunfels, TX 78131 | Oil & Gas Operator | May 2024 |
| 16 | Red Creek Oil Co | | Oil & Gas Operator | Jun 1995 |
| 17 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 18 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 19 | Redcord C R | Louisville, KY 40243 | Oil Operator | Jan 2024 |
| 20 | Redhen Oil Company | Oklahoma City, OK 73155-5449 | Oil & Gas Operator | Feb 2024 |
| 21 | Reeves Harold D | | Oil & Gas Operator | Apr 1992 |
| 22 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Jan 2024 |
| 23 | Rennick Henry | Pawhuska, OK 74056 | Oil Operator | Dec 2023 |
| 24 | Revard Oil & Gas Properties Inc | | Oil & Gas Operator | Jan 2024 |
| 25 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 26 | RM Oil & Gas Co | Pawhuska, OK 74056 | Oil Operator | Jul 1999 |
| 27 | Roadrunner Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 28 | Robbins Thomas D & Charlene A Revocable Trust | Plano, TX 75093-7471 | Oil Operator | Jul 2018 |
| 29 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 30 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 31 | Robinson Gary | Wynona, OK 74084 | Oil Operator | Oct 2023 |
| 32 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 33 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 34 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 35 | Rougeot Oil & Gas Corp | Sperry, OK 74073 | Oil & Gas Operator | Jan 2024 |
| 36 | Rountree Productions LLC | | Oil Operator | Jan 2024 |
| 37 | Royal Energy Resources LTD | Denver, CO 80221 | Oil & Gas Operator | May 2013 |
| 38 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 39 | Rozen H H | | Oil Operator | Aug 2022 |