| 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 | 5H Oil Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 4 | Ak Pearson Family Trust | Amarillo, TX 79114 | Oil Operator | Oct 2025 |
| 5 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 6 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 7 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 8 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 9 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 10 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 11 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Oct 2025 |
| 12 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 13 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 14 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 15 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Oct 2025 |
| 16 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 17 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 18 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 19 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 20 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Mar 2024 |
| 21 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 22 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 23 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 24 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 25 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Oct 2025 |
| 26 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 27 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2025 |
| 28 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 29 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |
| 30 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Oct 2025 |
| 31 | B&E Exploration, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2009 |
| 32 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 33 | Balcones Production Company | Houston, TX 77002 | Oil & Gas Operator | Feb 1996 |
| 34 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 35 | Batton Oil & Gas, LLC | Spearman, TX 79081 | Oil & Gas Operator | Oct 2025 |
| 36 | Bce-Mach II LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |
| 37 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |
| 38 | Be Anadarko II, LLC | Austin, TX 78731 | Oil & Gas Operator | Oct 2025 |
| 39 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 40 | Beaver Oil Company Inc | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2020 |
| 41 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Jun 2025 |
| 42 | Benn Oil & Gas | Perryton, TX 79070 | Oil & Gas Operator | Jun 2005 |
| 43 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Aug 2025 |
| 44 | Beta-Tex, An Oklahoma Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2024 |
| 45 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 46 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 47 | Bison Petroleum Corporation | Amarillo, TX 79121 | Oil & Gas Operator | Mar 1996 |
| 48 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 49 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 50 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 51 | Blackjack Oil & Gas, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 52 | Blue Dolphin Production LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 53 | Blue Grass Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 54 | Bluemark Energy, LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 55 | Bob-Kat Oil Co. | Prairie Lea, TX 78661 | Oil & Gas Operator | Oct 2025 |
| 56 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 57 | Bracken Energy Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2015 |
| 58 | Bracken Operating, L.L.C. | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 59 | Bravo Natural Resources, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2009 |
| 60 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 61 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 62 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 63 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 64 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 65 | Brighton Energy LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 66 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 67 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 68 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 69 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 70 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 71 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 72 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 73 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 74 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 75 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 76 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 77 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 78 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 79 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2025 |
| 80 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2025 |
| 81 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 82 | Carson Buckles Exploration LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 83 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Jun 2025 |
| 84 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 85 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 86 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 87 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |
| 88 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 89 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 90 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 91 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 92 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Oct 2025 |
| 93 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 94 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Oct 2025 |
| 95 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 96 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Jun 2025 |
| 97 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 98 | Citori Oil Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2014 |
| 99 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 100 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |