| 1 | Arcana Energy Corp Inc | Bartlesville, OK 74006 | Oil Operator | May 2017 |
| 2 | Bailey Petroleum Corporation | Oklahoma City, OK 73159-7652 | Oil & Gas Operator | Feb 2004 |
| 3 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 4 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 5 | Cricket Enterprises Corporation | Nowata, OK 74048-9683 | Oil & Gas Operator | Mar 2015 |
| 6 | Fitch Petroleum Company Inc | Adair, OK 74330 | Oil Operator | Jul 2025 |
| 7 | Gibraltar Petroleum Corporation | Mabank, TX 75147 | Oil & Gas Operator | Nov 2008 |
| 8 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 9 | Intergrated Drill & Expl Inc | Tulsa, OK 74136-1071 | Oil & Gas Operator | Sep 1994 |
| 10 | Jason Petroleum Corporation | Tulsa, OK 74170-0622 | Oil & Gas Operator | Dec 1998 |
| 11 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 12 | Lariat Energy & Supply Co Inc | Hulbert, OK 74441 | Oil & Gas Operator | Jun 2025 |
| 13 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 14 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 15 | Nancy Oil & Gas Corp | Tulsa, OK 74101 | Oil Operator | Apr 2020 |
| 16 | Parker Joe | Talala, OK 74080-3556 | Oil & Gas Operator | Dec 2012 |
| 17 | Quarles Drilling Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2008 |
| 18 | Ramco Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Feb 2012 |
| 19 | Replay Resources LLC | Ada, OK 74820-6512 | Oil Operator | Nov 2022 |
| 20 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 21 | Royal Petroleum | Baytown, TX 77521 | Oil & Gas Operator | Aug 2003 |
| 22 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 23 | Trace Operating Co & R Hudson | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2013 |
| 24 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 25 | Walter Parker Inc | Talala, OK 74080-3808 | Oil & Gas Operator | Jun 2025 |
| 26 | Westend Operating LLC | Collinsville, OK 74021 | Oil Operator | Jul 2025 |