| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 2 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 3 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 4 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 5 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 6 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Jun 2025 |
| 7 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 8 | Argali Exploration Company | | Gas Operator | Aug 2025 |
| 9 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Jun 2016 |
| 10 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 11 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 12 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Jul 2025 |
| 13 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Aug 2025 |
| 14 | Beeman Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 15 | Booco'S Contract Services Inc | | Oil & Gas Operator | Jan 2021 |
| 16 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 17 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 18 | Cedar Ridge LLC | | Oil & Gas Operator | Oct 2006 |
| 19 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 20 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Aug 2025 |
| 21 | Chandler & Associates LLC | | Oil & Gas Operator | Jul 2001 |
| 22 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 23 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 24 | CLX Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 25 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 26 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Oct 2025 |
| 27 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 28 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 29 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Aug 2025 |
| 30 | East Resources Management LLC | | Oil Operator | Oct 2010 |
| 31 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 32 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 33 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 34 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 35 | Fancher Oil LLC | Greenwood, CO 80111 | Oil & Gas Operator | Nov 2006 |
| 36 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 37 | Forestar Group Inc | | Oil & Gas Operator | Sep 2015 |
| 38 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 39 | Gadeco LLC | | Oil & Gas Operator | Aug 2025 |
| 40 | Genesis Gas & Oil LLC | Kansas City, MO 64108 | Oil & Gas Operator | Aug 2011 |
| 41 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 42 | Gilbert-Stewart Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 43 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Sep 2025 |
| 44 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 45 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Feb 2025 |
| 46 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 47 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 48 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 49 | HRM Resources III LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2022 |
| 50 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 51 | Infinity Oil & Gas Of Wyoming Inc | | Oil Operator | Dec 2007 |
| 52 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Oct 2025 |
| 53 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 54 | Journey Operating, L.L.C. | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 55 | Juniper Resources Inc | | Oil Operator | Sep 2004 |
| 56 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 57 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 58 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 59 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 60 | Lyster Oil Company Inc | | Oil & Gas Operator | Nov 2020 |
| 61 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 62 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Aug 2025 |
| 63 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 64 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 65 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 66 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Aug 2025 |
| 67 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 68 | Mustang Resources LLC | Houston, TX 77256 | Oil & Gas Operator | Aug 2025 |
| 69 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 70 | New Frontier Energy Inc | | Gas Operator | Mar 2010 |
| 71 | North Shore Exploration & Prod LLC | Broomfield, CO 80021 | Oil & Gas Operator | Aug 2025 |
| 72 | Ocean Energy Inc Ndba Devon Louisiana Corp | | Oil & Gas Operator | Jul 2001 |
| 73 | Organic Energy Company LLC | | Oil & Gas Operator | Sep 2025 |
| 74 | Paladin Energy Partners LLC | | Oil & Gas Operator | Dec 2006 |
| 75 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 76 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Jul 2025 |
| 77 | Peakview Operating Company, LLC | | Oil & Gas Operator | Jun 2025 |
| 78 | Peterson Energy Operating Inc | | Oil & Gas Operator | Aug 2025 |
| 79 | Petroleum Resource Management Corp. | | Oil & Gas Operator | Aug 2025 |
| 80 | Petroshare Corporation | | Oil & Gas Operator | Jan 2024 |
| 81 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 82 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 83 | Poc-I LLC | | Oil Operator | Aug 2025 |
| 84 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 85 | Qep Uinta Basin Inc | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2007 |
| 86 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 87 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 88 | Renegade Oil & Gas Company LLC | | Oil & Gas Operator | Jul 2025 |
| 89 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jul 2025 |
| 90 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 91 | Rocky MTN Natural Gas LLC Adba Black Hills Energy | | Gas Operator | Dec 2003 |
| 92 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 93 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Jun 2018 |
| 94 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 95 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Aug 2025 |
| 96 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 97 | Sourcegas Energy Services Co | Golden, CO 80401 | Gas Operator | Jun 2015 |
| 98 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 99 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 100 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |