| 1 | Acadian Gas Pipeline System | | Oil Operator | Jul 2024 |
| 2 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 3 | Alpine Energy Corp. | | Oil & Gas Operator | Jun 2004 |
| 4 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Nov 2024 |
| 5 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 6 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 7 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 9 | Anglo-Dutch Energy, LLC | | Oil & Gas Operator | Sep 2022 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 11 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 12 | Apex Oil & Gas, Inc. | Houston, TX 77067 | Oil & Gas Operator | Oct 2009 |
| 13 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 14 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 15 | Auro USA, Inc. | | Oil Operator | Jun 2024 |
| 16 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Sep 2024 |
| 17 | B K L Incorporated | Morton, TX 79346 | Oil & Gas Operator | Jun 2002 |
| 18 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 19 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 20 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 21 | Baxter Drill. & Explor., Inc. | | Oil Operator | Jun 1997 |
| 22 | Bayou Choctaw, Inc. | | Oil & Gas Operator | Jun 2004 |
| 23 | Bayou Sorrel Oil LLC | | Oil & Gas Operator | May 2015 |
| 24 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 25 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 26 | Bintliff Props. LTD. PRTNRSHP. | | Oil & Gas Operator | Dec 1987 |
| 27 | Bligh Petroleum, Inc. | | Oil & Gas Operator | Jun 2004 |
| 28 | Blocker Exploration Company | | Oil & Gas Operator | Apr 1983 |
| 29 | Blue Mill Farms, Inc. | | Oil & Gas Operator | Apr 1992 |
| 30 | BPR Energy, Inc. | | Oil & Gas Operator | Apr 2021 |
| 31 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 32 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 33 | Brock Exploration Corporation | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 34 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2024 |
| 35 | Burkhart Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2002 |
| 36 | Burrite Operating, LLC | | Oil Operator | May 2024 |
| 37 | C S Petroleum Inc | Norman, OK 73070 | Oil & Gas Operator | Jun 2024 |
| 38 | C.F. Braun & Company | | Oil & Gas Operator | Dec 1986 |
| 39 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 40 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 41 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 42 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 43 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 44 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Nov 2024 |
| 45 | Century Mineral Corporation | | Oil & Gas Operator | Dec 1990 |
| 46 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 47 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 48 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 49 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 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 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2004 |
| 54 | CLK Energy Partners, LLC | | Oil & Gas Operator | Aug 2018 |
| 55 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 56 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 57 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 58 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 59 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 60 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 61 | Consolidated Energy Res., Inc. | | Oil Operator | Jun 1992 |
| 62 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 63 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 64 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 65 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 66 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 67 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 68 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 69 | D. C. Bintliff | | Oil & Gas Operator | Mar 1987 |
| 70 | D.C.Bintliff-McCormick Oper Co | | Oil & Gas Operator | May 1984 |
| 71 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 72 | Darsey Operating Corporation | | Oil & Gas Operator | Sep 1990 |
| 73 | David L. Whittington Inc | | Gas Operator | Sep 2022 |
| 74 | Davis-Goodman Oil Company | | Oil & Gas Operator | Jun 1980 |
| 75 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Nov 2024 |
| 76 | Deblin Operating LTD | | Oil & Gas Operator | Jan 1997 |
| 77 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 78 | Delta Development Co. Inc. | | Oil & Gas Operator | Dec 1988 |
| 79 | Delta Petroleum Corp Of Co | | Oil & Gas Operator | Oct 2010 |
| 80 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 81 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 82 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 83 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Aug 2024 |
| 84 | Dome De Sel LLC | | Oil & Gas Operator | Jun 2024 |
| 85 | Dow Intrastate Gas Company | | Oil Operator | Dec 2023 |
| 86 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 87 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 88 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jun 2024 |
| 89 | Dynamic Exploration PTRS, LLC | | Oil & Gas Operator | Jul 2024 |
| 90 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 91 | E & E Production Company, Inc. | | Oil & Gas Operator | Dec 2004 |
| 92 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 93 | Ed I. Estis | | Oil & Gas Operator | Sep 1998 |
| 94 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 95 | El-Oil, LTD. | | Oil & Gas Operator | Jun 2024 |
| 96 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2024 |
| 97 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 98 | Enlink Lig, LLC | | Oil Operator | Jul 2024 |
| 99 | Eurovest Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 100 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jun 2024 |