| 1 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 2 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 3 | Apex Energy, L.L.C. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 4 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 5 | Ballantyne Oil, LLC | | Oil & Gas Operator | Mar 2023 |
| 6 | Bonray Energy Corp. | | Oil & Gas Operator | Jun 1985 |
| 7 | Bow Petroleum, Inc. Of Colorado | | Oil & Gas Operator | Oct 2025 |
| 8 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 9 | Brooks Exploration Inc | Denver, CO 80293 | Oil & Gas Operator | Mar 2001 |
| 10 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 11 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 12 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 13 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 14 | Dakota-3 E&P Company, LLC | | Oil & Gas Operator | Jan 2012 |
| 15 | Devon Energy Williston, L.L.C | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Sep 2025 |
| 16 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Sep 2025 |
| 17 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 18 | Equinor Energy LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2021 |
| 19 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 20 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 21 | Grayson Mill Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 22 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Sep 2025 |
| 23 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 24 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 25 | Jettison, Inc. | | Oil & Gas Operator | Oct 2025 |
| 26 | Jordan Exploration Company, L.L.C. | | Oil & Gas Operator | Mar 2024 |
| 27 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 28 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 29 | Kraken Development III, LLC | | Oil & Gas Operator | Nov 2021 |
| 30 | Liberty Resources Management Co LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 31 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 32 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 33 | Missouri River Royalty Corporation | Bismarck, ND 58504 | Oil & Gas Operator | Sep 2025 |
| 34 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 35 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Sep 2025 |
| 36 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 37 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 38 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 39 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 40 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | Sep 2025 |
| 41 | Pintail Petroleum Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2010 |
| 42 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 43 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 44 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 45 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 46 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 47 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Oct 2025 |
| 48 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Aug 2025 |
| 49 | Ryan Exploration, Inc. | | Oil & Gas Operator | Mar 2012 |
| 50 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 51 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 52 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 53 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 54 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Dec 2025 |
| 55 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 56 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 57 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Sep 2025 |
| 58 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 59 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 60 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Sep 2025 |
| 61 | Turtle Mountain Gas & Oil, Inc. | | Oil & Gas Operator | Oct 2006 |
| 62 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 63 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 64 | White Butte Oil Operations, LLC | | Oil & Gas Operator | Sep 2025 |
| 65 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 66 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 67 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 68 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 69 | WPX Energy Williston, LLC | | Oil & Gas Operator | Sep 2025 |
| 70 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 71 | Zenergy Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2016 |