| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Mar 2025 |
| 2 | A R W Exploration Corp | Stillwater, OK 74076 | Oil & Gas Operator | May 2013 |
| 3 | Abps Energy Inc | Chickasha, OK 73023-1658 | Oil & Gas Operator | Apr 2015 |
| 4 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 5 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 6 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 7 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 8 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 9 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 11 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 12 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 13 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 14 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 15 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 16 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | May 2025 |
| 17 | B & H Oil Co. | Oklahoma City, OK 73108 | Oil & Gas Operator | Jan 2025 |
| 18 | B & O Drilling Inc | Ada, OK 74820-8065 | Oil & Gas Operator | Sep 2014 |
| 19 | B & W Operating, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 20 | B R Smith Disposal Co | | Oil & Gas Operator | Jun 2021 |
| 21 | Barker Production Co., LP | San Angelo, TX 76904 | Oil & Gas Operator | May 2025 |
| 22 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 23 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 24 | Bce-Mach II LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 25 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 26 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 27 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 28 | Beta Oil Company Inc | Oklahoma City, OK 73157-2958 | Oil & Gas Operator | Dec 2022 |
| 29 | Bird Oil & Gas Inc | Yukon, OK 73099-2827 | Oil & Gas Operator | Jan 2023 |
| 30 | Blackhawk Oil Co | Ottawa, KS 66067 | Oil & Gas Operator | Jan 2011 |
| 31 | Blackjack Oil & Gas, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 32 | Blake Production Company, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 33 | Bluemark Energy, LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2025 |
| 34 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 35 | BP Explorationinc/Ofb See #17756 | | Oil & Gas Operator | Apr 2015 |
| 36 | Bradmar Petroleum Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 37 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 38 | BRG Petroleum LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 39 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 40 | Bryant Expl And Prod Co Inc | Elk City, OK 73648-0827 | Oil & Gas Operator | Apr 2014 |
| 41 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 42 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 43 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Jan 2025 |
| 44 | Butler & Haseloff | Vernon, TX 76384 | Oil Operator | Jul 1993 |
| 45 | Butler B F | Hobart, OK 73651 | Oil Operator | Apr 2014 |
| 46 | Butler Petroleum Corp | Norman, OK 73069-7111 | Oil & Gas Operator | Dec 1998 |
| 47 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 48 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 49 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 50 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Mar 2025 |
| 51 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2025 |
| 52 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2025 |
| 53 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 54 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 55 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 56 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 57 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 58 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 59 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 60 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 61 | Collins Dillard Dba Dilco Oil Company | Mangum, OK 73554-4029 | Oil & Gas Operator | Mar 2025 |
| 62 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 63 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | May 2025 |
| 64 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 65 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2025 |
| 66 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 67 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 68 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jan 2025 |
| 69 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 70 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Feb 2025 |
| 71 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 72 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 73 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 74 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 75 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 76 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 77 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 78 | Davis/Osage Corp | Tulsa, OK 74103 | Oil Operator | Jan 2001 |
| 79 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 80 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 81 | Dernick Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 82 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 83 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 84 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 85 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 86 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 87 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 88 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 89 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 90 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 91 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 92 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 93 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Jan 2025 |
| 94 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 95 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | May 2025 |
| 96 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 97 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 98 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Feb 2025 |
| 99 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 100 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |