| 1 | Ajax Oil & Gas C | | Oil & Gas Operator | Jun 1989 |
| 2 | Berky Resources | | Oil & Gas Operator | Sep 1994 |
| 3 | Billy Oil Incorp | | Oil & Gas Operator | Nov 1991 |
| 4 | Bolinger Backhoe | | Oil & Gas Operator | Dec 1996 |
| 5 | Bolinger Enterprises | | Oil & Gas Operator | Nov 1997 |
| 6 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 7 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 8 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Dec 2025 |
| 9 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 10 | Columbian Production Corporation | Topeka, KS 66601 | Oil Operator | Oct 1999 |
| 11 | Columbian Services C | | Oil Operator | Jan 1992 |
| 12 | Crescent Oil & Gas | Decatur, TX 76234 | Gas Operator | Dec 1999 |
| 13 | D. Jackson Rentals LLC | Easton, KS 66020 | Oil Operator | Dec 2025 |
| 14 | Dark Horse | | Oil Operator | Jun 2025 |
| 15 | Daystar Petroleum Inc | Eureka, KS 67045 | Oil & Gas Operator | Dec 2025 |
| 16 | Edmiston Oil Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 17 | Energy Managemen | | Oil & Gas Operator | Jul 1991 |
| 18 | Fairway Petroleu | | Oil & Gas Operator | Dec 1994 |
| 19 | Fairway Petroleum Inc | Stafford, TX 77497 | Oil & Gas Operator | Nov 2001 |
| 20 | Fox, Don | Chase, KS 67524 | Oil & Gas Operator | Jul 2006 |
| 21 | Graybol-Patton C | | Oil & Gas Operator | Oct 1991 |
| 22 | Guthrie Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 23 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 24 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 25 | Igwt, Inc. | Rose Hill, KS 67133 | Oil & Gas Operator | Dec 2025 |
| 26 | J D Drilling Company | Basehor, KS 66007 | Oil & Gas Operator | Dec 2023 |
| 27 | Jag Petroleum LLC | Houston, TX 77058 | Oil Operator | Nov 2009 |
| 28 | Jew-Del Oil & Ga | | Gas Operator | Dec 1994 |
| 29 | Kinderhook Oil & | | Oil Operator | Dec 1993 |
| 30 | KLM Exploration Company, Inc. | McLouth, KS 66054 | Oil Operator | Dec 2019 |
| 31 | KLMKH Inc | Charlotte, NC 28270 | Oil Operator | Sep 2025 |
| 32 | L & G Energy | | Oil & Gas Operator | Mar 1994 |
| 33 | L V Gas Incorpor | | Oil & Gas Operator | Mar 1991 |
| 34 | Lawrence Larry O | | Gas Operator | Sep 1993 |
| 35 | Leis, VIctor J. | Paola, KS 66071 | Oil & Gas Operator | Dec 2025 |
| 36 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 37 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 38 | Missouri River R | | Gas Operator | Jun 1993 |
| 39 | Monument Resources, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jun 2012 |
| 40 | Oilwell Operator | | Gas Operator | Dec 1994 |
| 41 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 42 | Pryor Oil Compan | | Oil & Gas Operator | Nov 1994 |
| 43 | Ptarmigan Inc | Leavenworth, KS 66048 | Oil Operator | Nov 2009 |
| 44 | Razorback Explor | | Gas Operator | Dec 1992 |
| 45 | Remco Ener Corpo | | Oil & Gas Operator | Dec 1994 |
| 46 | Remco Energy Corporation | Independence, MO 64055 | Oil & Gas Operator | Nov 2009 |
| 47 | Renegade Resources Corp. | Reno, NV 89511 | Oil & Gas Operator | Jul 2024 |
| 48 | Robinette Oil Company LLC | Chanute, KS 66720 | Oil Operator | Sep 2025 |
| 49 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 50 | S & V Oil Incorp | | Oil & Gas Operator | Apr 1990 |
| 51 | Samson Resources | | Oil Operator | Jan 1994 |
| 52 | Schmidt Construction Services LLC | | Oil Operator | Dec 2025 |
| 53 | Simco Petroleum | Cheyenne, WY 82003 | Oil & Gas Operator | Oct 2009 |
| 54 | Teg Midcontinent, Inc. | Aurora, CO 80014 | Oil Operator | Jul 2013 |
| 55 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 56 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 57 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Dec 2025 |
| 58 | Town Oil Co. | Paola, KS 66071 | Oil & Gas Operator | Dec 2025 |
| 59 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 60 | Western Frontier Adventure, LLC | Easton, KS 66020 | Oil Operator | Dec 2019 |
| 61 | Wykoma Oil Incor | | Oil & Gas Operator | Jul 1990 |
| 62 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |