| 1 | 4-H Operating Corporation | | Oil & Gas Operator | Oct 2017 |
| 2 | 8 North LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 3 | Aceite Energy Corp | | Oil & Gas Operator | Feb 2007 |
| 4 | Advantage Resources Inc | Broomfield, CO 80020 | Oil & Gas Operator | Dec 2023 |
| 5 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 6 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 7 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 8 | Apollo Operating LLC | | Oil & Gas Operator | Sep 2013 |
| 9 | Arch Oil & Gas LLC | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 10 | Barrett Corporation* Bill | | Oil & Gas Operator | Jan 2024 |
| 11 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 12 | Bataa Oil Inc | Greeley, CO 80634 | Oil & Gas Operator | Feb 2024 |
| 13 | Bates* James Edward | | Oil & Gas Operator | Jul 2017 |
| 14 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2024 |
| 15 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 16 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Apr 2024 |
| 17 | Bison IV Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 18 | Black Diamond Minerals LLC | | Oil & Gas Operator | Jun 2014 |
| 19 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 20 | Black Raven Energy Inc | | Oil & Gas Operator | Apr 2017 |
| 21 | Blue & Gray Energy Inc | | Oil & Gas Operator | Jun 2011 |
| 22 | Blue Chip Oil Inc | | Oil & Gas Operator | Jan 2024 |
| 23 | Blue Creek Inc | | Oil & Gas Operator | Dec 2002 |
| 24 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Jan 2024 |
| 25 | Brooks Exploration, Inc. | Denver, CO 80293 | Oil & Gas Operator | Mar 2001 |
| 26 | Brown Oil & Gas LLC | | Oil & Gas Operator | Jan 2024 |
| 27 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 28 | Caerus Washco LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 29 | Cannon Resources Inc | | Oil & Gas Operator | Sep 2003 |
| 30 | Carrizo Niobrara LLC | | Oil & Gas Operator | Aug 2017 |
| 31 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 32 | Cascade Oil And Gas, Inc | | Oil & Gas Operator | Jun 2005 |
| 33 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 34 | CDM Oil & Gas | | Oil & Gas Operator | Oct 2018 |
| 35 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2023 |
| 36 | CFG Energy, Inc | | Oil & Gas Operator | Apr 2006 |
| 37 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 38 | Charles P Dunning LLC | | Oil & Gas Operator | Jan 2024 |
| 39 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 40 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 41 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 42 | Civitas North LLC | | Oil & Gas Operator | Jan 2024 |
| 43 | Colorado Energy Minerals Inc | | Oil Operator | Dec 2010 |
| 44 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | May 2003 |
| 45 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 46 | Condor Energy Technology LLC | | Oil & Gas Operator | Jul 2018 |
| 47 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2024 |
| 48 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 49 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 50 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 51 | Crestone Peak Resources Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 52 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 53 | Cub Creek Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 54 | Davis, LLC* Edward Mike | | Oil & Gas Operator | Sep 2015 |
| 55 | Declar Oil & Gas Inc | | Oil & Gas Operator | Dec 2012 |
| 56 | Diamond Operating, Inc. | | Oil & Gas Operator | Feb 2022 |
| 57 | Diversified Operating Corporation | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 58 | DJ Production Services Inc | | Oil & Gas Operator | Sep 2012 |
| 59 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 60 | Donnelly Casing Pulling Co | | Oil Operator | Aug 2020 |
| 61 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Feb 2024 |
| 62 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 63 | Eddy Oil Company | | Oil & Gas Operator | May 2013 |
| 64 | Edge Energy II LLC | Golden, CO 80401 | Oil & Gas Operator | Mar 2024 |
| 65 | Edge Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 66 | Elk Exploration Inc | | Oil & Gas Operator | Jul 2001 |
| 67 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Jan 2021 |
| 68 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 69 | Energy Oil And Gas Inc | | Oil & Gas Operator | Dec 2010 |
| 70 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 71 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 72 | Enprop Inc | | Oil & Gas Operator | Feb 2013 |
| 73 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 74 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2023 |
| 75 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 76 | Fifth Creek Energy Operating Company LLC | | Oil & Gas Operator | Mar 2018 |
| 77 | Fortitude Exploration Co | | Oil & Gas Operator | Feb 2024 |
| 78 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 79 | Fountainhead Resources LTD | | Oil & Gas Operator | Aug 2016 |
| 80 | Francis Energy Inc | | Oil & Gas Operator | May 2000 |
| 81 | Fritzler Resources, Inc. | Fort Morgan, CO 80701 | Oil & Gas Operator | Dec 2023 |
| 82 | Fundare Resources Operating Company LLC | | Oil & Gas Operator | Feb 2024 |
| 83 | Gadeco LLC | | Oil & Gas Operator | Feb 2024 |
| 84 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 85 | Goodwin Energy Management LLC | | Oil & Gas Operator | Dec 2022 |
| 86 | Great Western Operating Company LLC | | Oil & Gas Operator | Aug 2022 |
| 87 | Griffin Management LLC | | Oil & Gas Operator | Feb 2010 |
| 88 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2024 |
| 89 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 90 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jan 2024 |
| 91 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 92 | Harsh International Inc | | Oil & Gas Operator | Dec 2013 |
| 93 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Jan 2024 |
| 94 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 95 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |
| 96 | Homestead Oil Inc | | Oil & Gas Operator | Jan 2018 |
| 97 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 98 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 99 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 100 | Hyndrex Resources | | Oil & Gas Operator | Apr 2018 |