| 1 | 84 Energy LLC | Richmond, TX 77406 | Oil & Gas Operator | Apr 2024 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 3 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 4 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Apr 2024 |
| 5 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 6 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 7 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 8 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 9 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 10 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2024 |
| 11 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 12 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 13 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 14 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 15 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 16 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 17 | American Energy Sources, Inc. | Spring, TX 77388 | Oil & Gas Operator | Dec 2008 |
| 18 | American National Petroleum Co. | Houston, TX 77057 | Oil & Gas Operator | Aug 1995 |
| 19 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | Apr 2024 |
| 20 | American Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 21 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 22 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 23 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 24 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 25 | Antelope Resources Inc | Billings, MT 59101 | Oil & Gas Operator | May 2017 |
| 26 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 27 | Araluen Energy, Inc. | Houston, TX 77094 | Oil Operator | Jun 2022 |
| 28 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 29 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2024 |
| 30 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 31 | Arriola Operating & Consltg Inc. | Dallas, TX 75248 | Oil Operator | Apr 2024 |
| 32 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Apr 2024 |
| 33 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 34 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 35 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 36 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 37 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 38 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Apr 2024 |
| 39 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 40 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 41 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Apr 2024 |
| 42 | B & T Operating Co. | Dawson, TX 76639 | Oil & Gas Operator | Apr 2024 |
| 43 | B.N.B. Production | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 1993 |
| 44 | B.N.B. Production Inc. | Austin, TX 78720 | Oil & Gas Operator | May 1996 |
| 45 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 46 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 47 | Basa Resources Inc | Dallas, TX 75254 | Oil & Gas Operator | Apr 2024 |
| 48 | Baseline Oil & Gas Corp. | Houston, TX 77267 | Oil & Gas Operator | Oct 2010 |
| 49 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 50 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 51 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 52 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2024 |
| 53 | Bejo Corporation | Richmond, TX 77407 | Oil & Gas Operator | Apr 2024 |
| 54 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Apr 2024 |
| 55 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | Apr 2024 |
| 56 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 57 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 58 | BKN Oil & Gas, Inc. | Port Lavaca, TX 77979 | Gas Operator | Aug 1997 |
| 59 | Black Creek Production Co., Inc. | Driftwood, TX 78619 | Oil & Gas Operator | Feb 2000 |
| 60 | Black Draw Energy LLC | Cypress, TX 77433 | Oil & Gas Operator | Apr 2024 |
| 61 | Blazer Energy Corp. | Alexandria, VA 22314 | Oil & Gas Operator | Dec 2014 |
| 62 | BLS Resources, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Feb 2001 |
| 63 | Bluefin Resources LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2023 |
| 64 | Boester, H. F. | Portland, TX 78374 | Oil & Gas Operator | Aug 2003 |
| 65 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 66 | Bois D'Arc Operating Corporation | Houston, TX 77040 | Oil & Gas Operator | Jan 2000 |
| 67 | Bomco USA, Inc. | Sugar Land, TX 77496 | Oil Operator | Apr 2024 |
| 68 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Apr 2024 |
| 69 | Boss Expl & Prod Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2008 |
| 70 | Boundary Ventures, Inc. | Columbus, TX 78934 | Oil Operator | Apr 2024 |
| 71 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 72 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 73 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 74 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 75 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 76 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 77 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Apr 2024 |
| 78 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 79 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 80 | Bushmaster Production Comp, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 81 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 82 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 83 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 84 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 85 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 86 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 87 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 88 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 89 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 90 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 91 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 92 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 93 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 94 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 95 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 96 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 97 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jan 2024 |
| 98 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 99 | Charro Operating LLC | Englewood, CO 80112 | Oil & Gas Operator | Apr 2024 |
| 100 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |