| 1 | A&S Mineral Development Company, LLC | Poplar, MT 59255 | Oil & Gas Operator | May 2025 |
| 2 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 3 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 4 | Bluebonnet Energy Corporation | Englewood, CO 80112 | Oil & Gas Operator | Sep 2015 |
| 5 | Chelin LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Apr 2025 |
| 6 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 7 | DL Energy, LLC | Saco, MT 59261 | Gas Operator | Mar 2025 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Jun 2025 |
| 10 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 11 | Hell Creek Crude LLC | Winnett, MT 59087 | Oil Operator | May 2025 |
| 12 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 13 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | May 2025 |
| 14 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 15 | Ridge Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 16 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jul 2025 |
| 17 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 18 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | May 2025 |
| 19 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 20 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 21 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 22 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | May 2025 |
| 23 | Texakoma Exploration & Production LLC | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 24 | Topaz Oil & Gas Inc | Fort Collins, CO 80627 | Gas Operator | Nov 2019 |
| 25 | Wbi Energy Transmission, Inc. | Glendive, MT 59330-0131 | Gas Operator | Nov 1999 |
| 26 | Wbi Production, Inc. | Glendive, MT 59330-0131 | Gas Operator | Mar 2001 |
| 27 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 28 | Zimco (Robt A Zimmerman) | Wolf Point, MT 59201 | Oil Operator | Apr 2009 |