| 1 | 3RP Operating | | Oil Operator | Dec 2017 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78258 | Oil & Gas Operator | May 2018 |
| 3 | Advantage Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Jan 2018 |
| 4 | Aksarben Petroleum, Inc. | | Oil Operator | Dec 2017 |
| 5 | Allison Bros DRLG Co Inc | | Oil & Gas Operator | Dec 2015 |
| 6 | Amata Oils Inc | | Oil Operator | Dec 2015 |
| 7 | Amazon Exploration LLC | | Oil Operator | Apr 2016 |
| 8 | Antelope Energy Company LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2018 |
| 9 | Arkies Well Service Inc | | Oil Operator | Aug 2009 |
| 10 | Babcock & Brown Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2007 |
| 11 | Bach Oil Production | | Oil Operator | Jan 2018 |
| 12 | Baker Corporation | | Oil Operator | Dec 2017 |
| 13 | Baney Well Service Inc | | Oil Operator | Jun 2016 |
| 14 | Banner Petroleum LLC | | Oil Operator | Dec 2015 |
| 15 | Bellaire Oil Co | Bakersfield, CA 93308 | Oil & Gas Operator | Feb 2018 |
| 16 | Benson Mineral Group, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 2018 |
| 17 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2018 |
| 18 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Dec 2018 |
| 19 | Berexco Inc. | | Oil & Gas Operator | Oct 2009 |
| 20 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | May 2018 |
| 21 | Black Hills Exploration & Production Inc | | Oil & Gas Operator | Dec 2018 |
| 22 | Bop West LLC | Wooster, OH 44691 | Oil Operator | Jan 2018 |
| 23 | Braden-Deem Inc | Scottsdale, AZ 85255 | Oil & Gas Operator | Jan 2018 |
| 24 | Branch Production | | Oil Operator | Dec 2017 |
| 25 | Brown Oil & Gas LLC | | Oil & Gas Operator | Dec 2017 |
| 26 | Bruce Oil Co LLC | McPherson, KS 67460 | Oil Operator | Jan 2018 |
| 27 | C & G Drilling, Inc | Eureka, KS 67045 | Oil Operator | Jan 2018 |
| 28 | C & M Oil Inc | | Oil & Gas Operator | Dec 2017 |
| 29 | Cannon, Robert D. | | Oil & Gas Operator | Dec 2017 |
| 30 | Canyon Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2018 |
| 31 | Cardinal Oil Company, Inc. | | Oil Operator | Dec 2017 |
| 32 | Centerra Energy Corp | | Oil Operator | Dec 2017 |
| 33 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2018 |
| 34 | Century Stimulation & Eng LLC | | Oil Operator | Dec 2015 |
| 35 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Dec 2018 |
| 36 | Chain, John H (Jack) | | Oil Operator | Dec 2017 |
| 37 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Mar 2018 |
| 38 | Citation Oil & Gas Corp Inc | | Oil Operator | Dec 2017 |
| 39 | Clayton Corp | Golden, CO 80401 | Oil & Gas Operator | Jan 2018 |
| 40 | CM Production, LLC | | Oil & Gas Operator | Dec 2016 |
| 41 | Coachman Energy Operating Co, L | | Oil Operator | Dec 2017 |
| 42 | Coleman Oil Co | | Oil Operator | Dec 2017 |
| 43 | Colton Limited Liability Co | | Oil & Gas Operator | Mar 2018 |
| 44 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Dec 2018 |
| 45 | Credo Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jan 2013 |
| 46 | Davis, Edward Mike | | Oil Operator | Dec 2011 |
| 47 | Daystar Petroleum Inc | Eureka, KS 67045 | Oil & Gas Operator | Jan 2018 |
| 48 | Debord Oil Producers Inc | | Oil Operator | Dec 2006 |
| 49 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 50 | Deutsch Oil Company | | Oil & Gas Operator | Jan 2018 |
| 51 | Devon Energy Production Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2015 |
| 52 | Diamond Oil & Gas LLC | Casper, WY 82601 | Oil & Gas Operator | Dec 2018 |
| 53 | Diamond Operating Inc | | Oil & Gas Operator | Mar 2018 |
| 54 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Dec 2010 |
| 55 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 56 | DNR Oil And Gas, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Dec 2018 |
| 57 | Dowd, Gene | | Oil & Gas Operator | Dec 2013 |
| 58 | Drake, Stuart | | Oil Operator | Dec 2013 |
| 59 | Duerfeldt, Esther | | Oil Operator | Dec 2017 |
| 60 | Eagle Creek Resources, LLC | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2017 |
| 61 | Earth Sound, Inc | | Oil Operator | Dec 2017 |
| 62 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | May 2018 |
| 63 | Elk Operating Company LLC | | Oil Operator | Dec 2017 |
| 64 | Energy Search Company Inc | | Oil & Gas Operator | Oct 2016 |
| 65 | Evertson Operating Company Inc | | Oil & Gas Operator | Dec 2018 |
| 66 | Exco Resources, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Jan 2018 |
| 67 | Fahey, John R | | Oil Operator | Dec 2017 |
| 68 | Fairways Exploration & Production, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2018 |
| 69 | Farmer Inc, John O | | Oil Operator | Dec 2017 |
| 70 | Flatirons Resources LLC | Westminster, CO 80020 | Oil & Gas Operator | Mar 2018 |
| 71 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jan 2018 |
| 72 | Foundation Energy MGT, LLC | | Oil & Gas Operator | Jan 2014 |
| 73 | Four W Oil Co., LLC | | Oil Operator | Dec 2017 |
| 74 | Frerichs, Everett | | Oil Operator | Dec 2017 |
| 75 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Jan 2018 |
| 76 | Grayhorse Operating Inc | Tulsa, OK 74103-4439 | Oil & Gas Operator | Mar 2018 |
| 77 | Great Plains Energy, Inc. | Lin Coln, NE 68516 | Oil & Gas Operator | Feb 2018 |
| 78 | Gregory, JD | | Oil & Gas Operator | Dec 2017 |
| 79 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2018 |
| 80 | H & M Petroleum Corporation, Gla | | Oil & Gas Operator | Dec 2017 |
| 81 | H & R Expl & Production Inc | Sidney, NE 69162 | Oil Operator | May 2007 |
| 82 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Dec 2014 |
| 83 | Hesperus Energy LLC | | Oil Operator | Dec 2017 |
| 84 | Hoefle Oil Company | | Gas Operator | Dec 2011 |
| 85 | Hrbek, R. L. | Merino, CO 80741 | Oil & Gas Operator | Dec 2017 |
| 86 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2018 |
| 87 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jan 2018 |
| 88 | Intermountain Petroleum Co | | Oil Operator | Dec 2011 |
| 89 | International Petroleum Service, | | Oil Operator | Dec 2017 |
| 90 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Feb 2018 |
| 91 | Ivansons Oil Production | | Oil Operator | Dec 2017 |
| 92 | JB Operating LLC | | Oil Operator | Dec 2017 |
| 93 | Jetta Operating Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2018 |
| 94 | John G Brown, LLC | | Oil Operator | Dec 2017 |
| 95 | Kaler Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Dec 2017 |
| 96 | Kebrh Operating LLC | | Oil & Gas Operator | Dec 2017 |
| 97 | Kinder Morgan, Inc. | | Oil Operator | Dec 2011 |
| 98 | Kinderhook Dawson Prod | | Oil Operator | Dec 2013 |
| 99 | Kodiak Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 2018 |
| 100 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2017 |