| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 3 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 4 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 5 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 7 | Apexco Explor. & Prod., Inc. | | Oil & Gas Operator | May 1988 |
| 8 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 9 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 10 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 11 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 12 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 13 | B & T Operating Co. | Dawson, TX 76639 | Oil & Gas Operator | Feb 2026 |
| 14 | B&L Exploration, L.L.C. | Metairie, LA 70001 | Oil & Gas Operator | Feb 2026 |
| 15 | Barcoo Exploration Inc. | | Gas Operator | Jan 1993 |
| 16 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 17 | Bke-A, L L C | | Oil & Gas Operator | Jun 1999 |
| 18 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 19 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 20 | Calyx Exploration & Production | | Oil & Gas Operator | Jul 1991 |
| 21 | Carl Oil & Gas Co.-CNG | | Oil & Gas Operator | Dec 1995 |
| 22 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 23 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 24 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 25 | Cliffs Drilling Company | | Oil & Gas Operator | Dec 1984 |
| 26 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 27 | Clovelly Oil Co., Inc. | | Oil & Gas Operator | Nov 2008 |
| 28 | Clovelly Oil Co., Inc. - Ripco | | Oil & Gas Operator | Nov 1991 |
| 29 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 30 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 31 | Cockrell Oil Corporation | Houston, TX 77002-7348 | Oil & Gas Operator | Feb 2001 |
| 32 | Colorado Oil Co., Inc. | | Oil & Gas Operator | Dec 1977 |
| 33 | Columbia Minerals Corp., Inc. | | Oil & Gas Operator | May 1996 |
| 34 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 35 | Cox Operating, L.L.C. | | Oil & Gas Operator | Jan 2024 |
| 36 | Crescent Energy Company | | Oil Operator | May 1993 |
| 37 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 38 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 39 | Delta Development Co. Inc. | | Oil & Gas Operator | Dec 1988 |
| 40 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 41 | Denbury Offshore, Inc. | | Oil & Gas Operator | Nov 2004 |
| 42 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 43 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 44 | Despot Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 45 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 46 | Dixie Well Service, Inc. | | Oil & Gas Operator | Jul 1995 |
| 47 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 48 | Enbridge P/LS (La Intra.)L.L.C. | | Oil Operator | Oct 2009 |
| 49 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 50 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 51 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 52 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 53 | Felmont Oil Corporation | Walnut Creek, CA 94596-3568 | Oil & Gas Operator | Feb 1990 |
| 54 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 55 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 56 | Fpco Oil & Gas Co. | New Orleans, LA 70160 | Oil & Gas Operator | Sep 2025 |
| 57 | Gas Producing Enterprises, Inc. | | Oil & Gas Operator | Oct 1985 |
| 58 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 59 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 60 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 61 | Gulf Outlet Resources, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 62 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 63 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 64 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 65 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 66 | Hess Corporation, A De Corp. | | Oil & Gas Operator | Oct 2006 |
| 67 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Apr 1994 |
| 68 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 69 | Integrated Exploration & Production LLC | | Oil & Gas Operator | Aug 2024 |
| 70 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 71 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 72 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 73 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 74 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 75 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 76 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 77 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 78 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 79 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 80 | Lake A, LTD. | | Oil Operator | May 1998 |
| 81 | Legacy Operating Company | | Oil & Gas Operator | Aug 1992 |
| 82 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Feb 2026 |
| 83 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 84 | Llog Exploration Company, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 85 | Lobo Operating, Inc. | Houston, TX 77077 | Oil & Gas Operator | Dec 2024 |
| 86 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 87 | M P O'Meara, Jr. Inc. | | Oil & Gas Operator | Sep 2000 |
| 88 | M. P. O'Meara Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 89 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 90 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Feb 2026 |
| 91 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 92 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 93 | McCormick-Bintliff | | Oil & Gas Operator | Feb 1984 |
| 94 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 95 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 96 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 97 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 98 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 99 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 100 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |