| 1 | Aeon Energy Corp. | | Oil & Gas Operator | Apr 2021 |
| 2 | Alamosa Drilling Inc | | Oil & Gas Operator | Mar 2021 |
| 3 | American Petroleum Energy Co | | Gas Operator | Apr 2021 |
| 4 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 5 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jun 2021 |
| 6 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 7 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2021 |
| 8 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2021 |
| 9 | Apollo Operating LLC | | Oil & Gas Operator | Sep 2013 |
| 10 | Arch Oil & Gas, LLC | Dallas, TX 75248 | Oil & Gas Operator | Jun 2021 |
| 11 | Argali Exploration Company | | Gas Operator | Mar 2021 |
| 12 | Argonex Company LLC | | Oil & Gas Operator | Apr 2021 |
| 13 | Ark Trust, Carol W Byrd Trustee | | Oil Operator | Apr 2021 |
| 14 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2021 |
| 15 | Arp Production Company, LLC | Fort Worth, TX 76116 | Gas Operator | Mar 2021 |
| 16 | Atlas Resources LLC Dba Atlas Rockies LLC | | Gas Operator | Jun 2017 |
| 17 | Augustus Energy Resources LLC | | Oil & Gas Operator | Oct 2019 |
| 18 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 19 | Aus-Tex Exploration Inc | | Oil & Gas Operator | Apr 2021 |
| 20 | Ausmus & Clark Oil | | Oil Operator | Jun 2020 |
| 21 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Jun 2016 |
| 22 | Baney Well Service Inc | | Oil Operator | Jun 2016 |
| 23 | Barrett Corporation* Bill | | Oil & Gas Operator | Apr 2021 |
| 24 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 25 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Apr 2021 |
| 26 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 27 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Apr 2021 |
| 28 | Becca Oil LLC | Cushing, OK 74023-1347 | Oil & Gas Operator | Sep 2018 |
| 29 | Beeman Oil & Gas LLC | | Oil & Gas Operator | May 2021 |
| 30 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Apr 2020 |
| 31 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | Apr 2021 |
| 32 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2021 |
| 33 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Apr 2021 |
| 34 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Jun 2021 |
| 35 | Berry Energy Inc*Walter | | Oil & Gas Operator | Feb 2017 |
| 36 | Big Run Production Company | Tyler, TX 75701 | Oil & Gas Operator | Jun 2021 |
| 37 | Black Hills Exploration & Production Inc | | Oil & Gas Operator | May 2018 |
| 38 | Black Hills Plateau Production LLC | | Oil & Gas Operator | May 2018 |
| 39 | Black Raven Energy Inc | | Oil & Gas Operator | Jun 2017 |
| 40 | Blue Chip Oil Inc | | Oil & Gas Operator | Mar 2021 |
| 41 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Mar 2021 |
| 42 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 43 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2021 |
| 44 | Brown Oil & Gas LLC | Sterling, CO 80751 8314 | Oil & Gas Operator | Apr 2021 |
| 45 | Burlington Resources Oil & Gas LP | | Oil & Gas Operator | Oct 2020 |
| 46 | Byron Oil Industries Inc | Ballwin, MO 63011 | Oil & Gas Operator | Apr 2019 |
| 47 | C & J Field Services | | Oil & Gas Operator | Apr 2021 |
| 48 | Caerus Piceance LLC | | Oil & Gas Operator | Apr 2021 |
| 49 | Caerus Washco LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2019 |
| 50 | Carrizo Niobrara LLC | | Oil & Gas Operator | Oct 2017 |
| 51 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2021 |
| 52 | Cascade Petroleum LLC | | Oil & Gas Operator | Nov 2015 |
| 53 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | May 2021 |
| 54 | Cci Paradox Upstream LLC | | Oil & Gas Operator | Mar 2021 |
| 55 | CDM Oil & Gas | | Oil & Gas Operator | Oct 2018 |
| 56 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 57 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 58 | CGT Inc | | Oil & Gas Operator | May 2015 |
| 59 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Apr 2021 |
| 60 | Charles P Dunning LLC | | Oil & Gas Operator | Dec 2020 |
| 61 | Chemco Inc | | Oil & Gas Operator | Apr 2021 |
| 62 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2021 |
| 63 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Jun 2021 |
| 64 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2021 |
| 65 | Cholla Petroleum, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2021 |
| 66 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Apr 2021 |
| 67 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 68 | Cinnamon Creek Oil & Gas Inc | | Oil Operator | Apr 2021 |
| 69 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 70 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jun 2021 |
| 71 | City & County Of Denver | | Oil & Gas Operator | May 2021 |
| 72 | CM Production, LLC | | Oil & Gas Operator | Aug 2020 |
| 73 | Coachman Energy Operating Company LLC | Englewood, CO 80111 | Oil & Gas Operator | Aug 2018 |
| 74 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Mar 2021 |
| 75 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Apr 2021 |
| 76 | Colton Limited Liability Co | | Oil & Gas Operator | May 2021 |
| 77 | Condor Energy Technology LLC | | Oil & Gas Operator | Jul 2018 |
| 78 | ConocoPhillips Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2021 |
| 79 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Jun 2021 |
| 80 | Continental Resources Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2021 |
| 81 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | May 2021 |
| 82 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 83 | Crumley* Jack | | Oil Operator | Aug 2018 |
| 84 | Curton Capital Corp | Dallas, TX 75201 | Oil Operator | Sep 2015 |
| 85 | D & G Roustabout Service | | Oil & Gas Operator | Mar 2021 |
| 86 | Dakota Exploration LLC | Tulsa, OK 74136-5709 | Oil & Gas Operator | Jun 2019 |
| 87 | Davis, LLC* Edward Mike | | Oil & Gas Operator | Sep 2015 |
| 88 | Dejour Energy (USA) Corporation | | Oil & Gas Operator | Jun 2014 |
| 89 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Jun 2021 |
| 90 | Diamond Operating Inc | | Oil & Gas Operator | Apr 2021 |
| 91 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 92 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Dec 2020 |
| 93 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 94 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Mar 2021 |
| 95 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Aug 2018 |
| 96 | Eagle Operating, Inc. | | Oil & Gas Operator | Apr 2021 |
| 97 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 98 | East Cheyenne Gas Storage LLC | | Oil Operator | May 2021 |
| 99 | Edge Energy LLC | | Oil & Gas Operator | Apr 2021 |
| 100 | Ee3 LLC | | Oil & Gas Operator | Nov 2015 |