| 1 | 1849 Energy Partners Oprtng, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2022 |
| 2 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 4 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 5 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 6 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 7 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 8 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | May 2025 |
| 9 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 10 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 11 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 12 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 13 | Basal Corporation | Cleburne, TX 76033 | Oil & Gas Operator | May 2025 |
| 14 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 15 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 16 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 17 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 18 | BP Operating Company, LLC | Dallas, TX 75225 | Oil & Gas Operator | Jul 2022 |
| 19 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 20 | Briley Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 21 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 22 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 23 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 24 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 25 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 26 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 27 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 28 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 29 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 30 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 31 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 32 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 33 | CR2 Energy LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 34 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 35 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 36 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 37 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 38 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 39 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | May 2025 |
| 40 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 41 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | May 2025 |
| 42 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 43 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 44 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | May 2025 |
| 45 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 46 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 47 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 48 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 49 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 50 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2025 |
| 51 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 52 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 53 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 54 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 55 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 56 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 57 | Fourstar Resources LLC | Westlake, TX 76262 | Oil Operator | Mar 2025 |
| 58 | Geo Logic Environmental SRVCS LC | Kilgore, TX 75663 | Oil Operator | Dec 2011 |
| 59 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 60 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 61 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 62 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 63 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 64 | Infinity Oil & Gas Inc | Nowata, OK 74048 | Oil Operator | Jun 1993 |
| 65 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | May 2025 |
| 66 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 67 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 68 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 69 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 70 | Kynge Energy Investments LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 71 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 72 | Lincoln Energy Partners, LLC | South Dennis, MA 02660 | Oil Operator | May 2025 |
| 73 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 74 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 75 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 76 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Mar 2025 |
| 77 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 78 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 79 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 80 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 81 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 82 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | May 2025 |
| 83 | North Texas Llano Operating Corp | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 84 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 85 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 86 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 87 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 88 | Overton Park Oil & Gas LP | Fort Worth, TX 76109 | Oil & Gas Operator | May 2025 |
| 89 | Paloma Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2018 |
| 90 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 91 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 92 | Pgi Operating, LLC | Sweetwater, TX 79556 | Oil Operator | May 2025 |
| 93 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 94 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 95 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 96 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 97 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 98 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 99 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 100 | Regal Energy Operating, L.L.C. | Plano, TX 75024 | Oil & Gas Operator | May 2025 |