| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | 4P Energy Texas, LLC | Denver, CO 80206 | Oil & Gas Operator | Nov 2020 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Sep 2025 |
| 4 | Adams & McGahey | Amarillo, TX 79114 | Oil & Gas Operator | Nov 1998 |
| 5 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Sep 2025 |
| 6 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 7 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 8 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Sep 2025 |
| 9 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 10 | Amedan Resources, Inc. | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2008 |
| 11 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Sep 2025 |
| 12 | Amexco, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Sep 2025 |
| 13 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 14 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jun 2025 |
| 15 | Aog, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2014 |
| 16 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 17 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 18 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 19 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Mar 2024 |
| 20 | Archer,Carl M Estate Partnership | Gruver, TX 79040 | Oil & Gas Operator | Sep 2022 |
| 21 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 22 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Sep 2025 |
| 23 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | May 2025 |
| 24 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 25 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Sep 2025 |
| 26 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 27 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 28 | B & W Operating, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 29 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Sep 2025 |
| 30 | B J Resources, L.L.C. | Athens, TX 75751 | Oil & Gas Operator | Sep 2025 |
| 31 | B&E Exploration, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2009 |
| 32 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 33 | Bar L Producers | Fritch, TX 79036 | Oil & Gas Operator | Feb 2025 |
| 34 | Barbour Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Sep 2025 |
| 35 | Batton Oil & Gas, LLC | Spearman, TX 79081 | Oil & Gas Operator | Sep 2025 |
| 36 | Bce-Mach II LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 37 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 38 | Be Anadarko II, LLC | Austin, TX 78731 | Oil & Gas Operator | Sep 2025 |
| 39 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 40 | Benn Oil & Gas | Perryton, TX 79070 | Oil & Gas Operator | Jun 2005 |
| 41 | Benson-McCown & Company | Amarillo, TX 79114 | Oil & Gas Operator | Jul 2016 |
| 42 | Berexco Inc. | Wichita, KS 67208 | Oil & Gas Operator | Oct 2009 |
| 43 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 44 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 45 | Bison Petroleum Corporation | Amarillo, TX 79121 | Oil & Gas Operator | Mar 1996 |
| 46 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 47 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 48 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2025 |
| 49 | Blue Dolphin Production LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2025 |
| 50 | Blue Grass Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 51 | Bluemark Energy, LLC | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 52 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Sep 2025 |
| 53 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 54 | Bracken Energy Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2015 |
| 55 | Bracken Operating, L.L.C. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2025 |
| 56 | Brawley Petroleum Corporation | Lubbock, TX 79424 | Gas Operator | Aug 2017 |
| 57 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 58 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 59 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 60 | Bright Horizon Texas LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2016 |
| 61 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 62 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 63 | Brock Resources, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | Nov 1998 |
| 64 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 65 | Buffalo Raider Consulting, LLC | Amarillo, TX 79119 | Oil & Gas Operator | Sep 2025 |
| 66 | Burgess, W. E. | Fort Worth, TX 76147 | Oil & Gas Operator | Sep 2025 |
| 67 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 68 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 69 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 70 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 71 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 72 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 73 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 74 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | May 2025 |
| 75 | Capstone Cactus Operating Comp. | Hennessey, OK 73742 | Oil & Gas Operator | Sep 2025 |
| 76 | Carson Buckles Exploration LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 77 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jun 2025 |
| 78 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 79 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 80 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 81 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 82 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 83 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 84 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 85 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 86 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 87 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 88 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 89 | Clay Petroleum | Prosper, TX 75078 | Oil & Gas Operator | Feb 2023 |
| 90 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 91 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2025 |
| 92 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 93 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 94 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Sep 2025 |
| 95 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 96 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 97 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Sep 2025 |
| 98 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 99 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Sep 2025 |
| 100 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Sep 2025 |