| 1 | A & C Gas Productions, Inc. | | Gas Operator | Mar 2012 |
| 2 | A J & A, Inc. | | Gas Operator | Feb 2009 |
| 3 | Abco Petroleum Corp. | | Oil & Gas Operator | Feb 1999 |
| 4 | Ace Drilling Services, Inc. | | Oil & Gas Operator | Sep 1987 |
| 5 | Aix Energy Inc | | Oil & Gas Operator | Jul 2016 |
| 6 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 7 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2025 |
| 8 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 9 | Ankor E&P Holdings Corporation | | Oil & Gas Operator | Jan 2021 |
| 10 | Annona Productions, Inc. | | Gas Operator | May 2019 |
| 11 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 12 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 13 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 14 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 15 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |
| 16 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Dec 2025 |
| 17 | B. L. G. Company | | Gas Operator | Nov 1989 |
| 18 | Barnette & Sons, Inc. | Dubach, LA 71235 | Oil & Gas Operator | Mar 2011 |
| 19 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 20 | Bayles & White | | Gas Operator | Dec 2013 |
| 21 | Bayou L'Ours Oil & Gas Co. | | Gas Operator | Mar 1988 |
| 22 | Bengal Oil & Gas, Inc. | | Gas Operator | Mar 2006 |
| 23 | Bethlan Production Corporation | | Oil & Gas Operator | Dec 1994 |
| 24 | Black Diamond Production Co. | | Oil & Gas Operator | Mar 2021 |
| 25 | Bob L. Herd & Petrofunds | | Oil & Gas Operator | Mar 1984 |
| 26 | Bobby Jenny | | Gas Operator | Dec 2001 |
| 27 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 28 | Bryant Oil & Gas Corporation | | Oil & Gas Operator | Mar 1987 |
| 29 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 30 | C C Co | Holladay, UT 84124 | Oil & Gas Operator | Jan 2020 |
| 31 | Cargas Operating Company | | Oil & Gas Operator | Dec 2024 |
| 32 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 33 | Ceka Gas, Div Of GTC | | Oil & Gas Operator | May 1988 |
| 34 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 35 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 36 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 37 | Ciera Resources, Inc. | | Gas Operator | Nov 1998 |
| 38 | Cisco Petroleum, Inc. | | Oil & Gas Operator | Oct 2010 |
| 39 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 40 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 41 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 42 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 43 | Clements-B & MCK - Luffey | | Gas Operator | Apr 1979 |
| 44 | Coho Louisiana Production Co | | Gas Operator | Dec 1998 |
| 45 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |
| 46 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 47 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 48 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 49 | Crescent Drilling Company, Inc. | | Gas Operator | Dec 2024 |
| 50 | Criswell E. White | | Gas Operator | Jun 2015 |
| 51 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 52 | Cti Associates | | Gas Operator | Jan 1990 |
| 53 | Custer K. Primos | | Oil & Gas Operator | Oct 2002 |
| 54 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 55 | D & W Oil & Gas Co. | | Gas Operator | Jan 1990 |
| 56 | D. J. Simmons & Co. Of La. | | Gas Operator | Nov 1996 |
| 57 | Dalen Resources Oil & Gas Co | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 58 | Dalton J. Woods | | Oil & Gas Operator | Dec 1985 |
| 59 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 60 | David L. Whittington | | Gas Operator | Dec 1998 |
| 61 | David L. Whittington Inc | | Gas Operator | Sep 2022 |
| 62 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 63 | Delta Oil Corp | | Oil & Gas Operator | Dec 2005 |
| 64 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 65 | Diablo Oil Corp. | | Oil & Gas Operator | Apr 1989 |
| 66 | Donny Joe Barnhill | | Gas Operator | Dec 2024 |
| 67 | Drake Energy Corporation | | Gas Operator | Dec 2024 |
| 68 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 69 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 70 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 71 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 72 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 73 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 74 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 75 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 76 | Enervest Production Partners, LTD. | | Gas Operator | Nov 2024 |
| 77 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 78 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 79 | Ergon, Inc. | | Oil & Gas Operator | Dec 2005 |
| 80 | F H Walsh Jr Operating Co Inc | | Oil & Gas Operator | Jul 1995 |
| 81 | F Howard Walsh Jr | | Oil & Gas Operator | Aug 1992 |
| 82 | F W Rabalais, Inc. | | Oil & Gas Operator | Dec 2014 |
| 83 | Fifty Third Corp. & K.M.O.C. | | Gas Operator | Jul 1994 |
| 84 | Fifty-Third Corporation | | Gas Operator | Jul 1994 |
| 85 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 86 | Fortune Gas & Oil, Inc. | | Oil & Gas Operator | Apr 2004 |
| 87 | Four Star Development Corp. | | Oil & Gas Operator | Feb 2013 |
| 88 | Frank B McGrath | | Gas Operator | Nov 2011 |
| 89 | Frank Spooner | | Oil & Gas Operator | Mar 1984 |
| 90 | Franks & Bass Et Al | | Oil & Gas Operator | Sep 1989 |
| 91 | Franks & Petrofunds Inc. Etal | | Oil & Gas Operator | Jun 1986 |
| 92 | Franks & Petrofunds, Inc. | | Oil & Gas Operator | Sep 1989 |
| 93 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 94 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 95 | Franks,Petrofunds & Flynn Etal | | Oil & Gas Operator | Nov 1984 |
| 96 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 97 | Gas Development Corporation | Broken Arrow, OK 74012 | Oil & Gas Operator | Mar 2015 |
| 98 | Gas Exploration | | Gas Operator | Feb 2005 |
| 99 | Gas Masters Of America | | Oil & Gas Operator | Oct 1993 |
| 100 | Gas Masters Of America, Inc. | | Oil & Gas Operator | Nov 2024 |