| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 2 | 84 Energy LLC | Richmond, TX 77406 | Oil & Gas Operator | Apr 2024 |
| 3 | A & D Exploration Company | Rockport, TX 78381 | Oil & Gas Operator | Apr 2024 |
| 4 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 5 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 6 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 7 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 8 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 9 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 10 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2024 |
| 11 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 12 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 13 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 14 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Feb 2023 |
| 15 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 16 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 17 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 18 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Apr 2024 |
| 19 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Apr 2024 |
| 20 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 21 | Barnett Oil Investments, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Mar 1999 |
| 22 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 23 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 24 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2024 |
| 25 | Bayshore Exploration LLC | Bellville, TX 77418 | Oil & Gas Operator | Dec 2016 |
| 26 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Feb 2024 |
| 27 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Apr 2024 |
| 28 | Big "6" Drilling Company | Houston, TX 77063 | Oil & Gas Operator | Mar 2019 |
| 29 | Bock & Bacon, Inc. | Houston, TX 77098 | Oil & Gas Operator | May 1999 |
| 30 | Bon Wier Producing Company | Monroe, LA 71207 | Oil & Gas Operator | Feb 2002 |
| 31 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 32 | Buckhorn Oilfield Service Inc | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 33 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 34 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 35 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Apr 2024 |
| 36 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 37 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 38 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 39 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 40 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 41 | Christensen & Matthews | Houston, TX 77040 | Oil & Gas Operator | Apr 2024 |
| 42 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 43 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Apr 2024 |
| 44 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 45 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Apr 2024 |
| 46 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2024 |
| 47 | Cokinos, Inc. | Beaumont, TX 77701 | Oil & Gas Operator | Aug 2003 |
| 48 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 49 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 50 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 51 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2024 |
| 52 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 53 | Copestone Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Apr 2024 |
| 54 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Apr 2024 |
| 55 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 56 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 57 | Dartex Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 58 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | Apr 2024 |
| 59 | DB Resources, LLC | Houston, TX 77019 | Oil & Gas Operator | Apr 2024 |
| 60 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 61 | Deltex Minerals Inc. | Peachtree Cty, GA 30269 | Oil & Gas Operator | Apr 2024 |
| 62 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 63 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Apr 2024 |
| 64 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 65 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |
| 66 | Double S Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 67 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 68 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 69 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 70 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Apr 2024 |
| 71 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 72 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2024 |
| 73 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 74 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Dec 2023 |
| 75 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 76 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 77 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 78 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 79 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Apr 2024 |
| 80 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 81 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Apr 2024 |
| 82 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2024 |
| 83 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 84 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 85 | Freeman Expl. & Prod. Co., Inc. | Houston, TX 77279 | Oil & Gas Operator | Aug 2020 |
| 86 | Gaither Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 87 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 88 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 89 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 90 | Graward Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 91 | Grit Oil & Gas, LLC | Houston, TX 77072 | Oil & Gas Operator | Apr 2019 |
| 92 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 93 | H L Brown Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2024 |
| 94 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 95 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 96 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 97 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 98 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 99 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Apr 2024 |
| 100 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |