| 1 | A & C Gas Productions, Inc. | | Gas Operator | Mar 2012 |
| 2 | A A Company | | Gas Operator | Jun 2005 |
| 3 | A J & A, Inc. | | Gas Operator | Feb 2009 |
| 4 | Acadian Land & Expl., Inc. | | Oil & Gas Operator | May 1992 |
| 5 | Ace Drilling Services, Inc. | | Oil & Gas Operator | Sep 1987 |
| 6 | Allied Petroleum Company | | Gas Operator | Dec 1992 |
| 7 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 9 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 10 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 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 | Asa Energy Corp | | Oil & Gas Operator | Jun 1984 |
| 14 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 15 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 16 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 17 | B & B Oil & Gas Co., Inc. | | Gas Operator | Feb 1991 |
| 18 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Dec 2025 |
| 19 | Barnett Serio | | Gas Operator | Oct 1992 |
| 20 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 21 | Bayles & White | | Gas Operator | Dec 2013 |
| 22 | Bayou Desiard Corporation | | Gas Operator | Dec 2002 |
| 23 | Bayou Gas Company Of Monroe La | | Gas Operator | Apr 2009 |
| 24 | Bengal Oil & Gas, Inc. | | Gas Operator | Mar 2006 |
| 25 | Bethlan Production Corporation | | Oil & Gas Operator | Dec 1994 |
| 26 | Biedenharn Et Al | | Gas Operator | Nov 1996 |
| 27 | Billy E. Bayles | | Oil & Gas Operator | Apr 1998 |
| 28 | Black Bayou Management Co Inc. | | Oil & Gas Operator | Aug 1980 |
| 29 | Blue Bird Oil & Gas Prod. Co. | | Gas Operator | Dec 2007 |
| 30 | Bradoil, Inc. | | Gas Operator | Feb 1991 |
| 31 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 32 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 33 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 34 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 35 | Bryant Oil & Gas Corporation | | Oil & Gas Operator | Mar 1987 |
| 36 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 37 | C. H. C. Gerard | | Oil & Gas Operator | Jan 2025 |
| 38 | C. H. Cuatro | | Gas Operator | Sep 1996 |
| 39 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Dec 2025 |
| 40 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2025 |
| 41 | Capital Gas, Inc. | | Gas Operator | Jan 1998 |
| 42 | Cargas Operating Company | | Oil & Gas Operator | Dec 2024 |
| 43 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 44 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 45 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 46 | Ceka Gas, Div Of GTC | | Oil & Gas Operator | May 1988 |
| 47 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 48 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 49 | Cisco Petroleum, Inc. | | Oil & Gas Operator | Oct 2010 |
| 50 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 51 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 52 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 53 | Clements-B & MCK - Luffey | | Gas Operator | Apr 1979 |
| 54 | Coho Louisiana Production Co | | Gas Operator | Dec 1998 |
| 55 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |
| 56 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 57 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 58 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 59 | Crescent Drilling Company, Inc. | | Gas Operator | Dec 2024 |
| 60 | Criswell E. White | | Gas Operator | Jun 2015 |
| 61 | Custer K. Primos | | Oil & Gas Operator | Oct 2002 |
| 62 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 63 | D & W Oil & Gas Co. | | Gas Operator | Jan 1990 |
| 64 | D-Ram Construction Co., Inc. | | Gas Operator | Dec 1990 |
| 65 | D. J. Simmons & Co. Of La. | | Gas Operator | Nov 1996 |
| 66 | Daleco Resources | | Gas Operator | Dec 2000 |
| 67 | David L. Whittington | | Gas Operator | Dec 1998 |
| 68 | David L. Whittington Inc | | Gas Operator | Sep 2022 |
| 69 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 70 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 71 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 72 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 73 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 74 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 75 | Diablo Oil Corp. | | Oil & Gas Operator | Apr 1989 |
| 76 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 77 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 78 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 79 | Drake Energy Corporation | | Gas Operator | Dec 2024 |
| 80 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 81 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 82 | Dubach Gas Company | | Oil Operator | May 2003 |
| 83 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 84 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 85 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 86 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 87 | Enervest Production Partners, LTD. | | Gas Operator | Nov 2024 |
| 88 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 89 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 90 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 91 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 92 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 93 | Equity Monroe Associates | | Gas Operator | Nov 1990 |
| 94 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 95 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 96 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 97 | Fifty-Third Corporation | | Gas Operator | Jul 1994 |
| 98 | Fireside Oil And Gas, Inc. | West Monroe, LA 71294 | Oil & Gas Operator | Feb 2002 |
| 99 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 100 | Foster-Brown Operations, Inc. | | Oil & Gas Operator | Apr 2003 |