| 1 | A. W. Sour, Jr. | | Oil Operator | Mar 2003 |
| 2 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 3 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 4 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Mar 2025 |
| 5 | Alvin & Roger Wilson | | Oil Operator | Dec 2007 |
| 6 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 7 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 9 | Andries Oil Company | | Oil Operator | Jan 2025 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 11 | Arbco, Inc. | | Oil & Gas Operator | Jan 1996 |
| 12 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 13 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 14 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 15 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 16 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 17 | Arlis Scogin Et Al | | Oil & Gas Operator | Jan 1990 |
| 18 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 19 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 20 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 21 | Attaway Energy Group, Inc. | | Oil & Gas Operator | Aug 1995 |
| 22 | Autry C Stephens | Midland, TX 79701 | Oil & Gas Operator | Dec 2001 |
| 23 | Azul Operating, LLC | | Gas Operator | Dec 2024 |
| 24 | B & B Enterprises | | Oil Operator | Jan 2025 |
| 25 | B & F Operating Company, Inc. | | Oil & Gas Operator | Mar 1995 |
| 26 | Bach Energy Corporation | | Oil & Gas Operator | Jul 1992 |
| 27 | Backus,Barnwell& Von Gonten | | Oil & Gas Operator | Oct 1984 |
| 28 | Barnwell Oil Company, Inc. | | Oil & Gas Operator | Sep 1991 |
| 29 | Barnwell Petroleum Corp. | | Oil & Gas Operator | Sep 1978 |
| 30 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 31 | BCF Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 32 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 33 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 34 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 35 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 36 | BHP Billiton Petro (Txla Operating) Co. | | Gas Operator | Jul 2019 |
| 37 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 38 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 39 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 40 | Black Bear Midstream LLC | | Oil Operator | Jan 2025 |
| 41 | Black Gold Production Co. Inc. | | Oil & Gas Operator | Feb 1998 |
| 42 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 43 | Blue Creek Resources, Inc. | | Oil & Gas Operator | May 1990 |
| 44 | BMR Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 45 | Bob R. Hyde Co. | | Oil Operator | May 1986 |
| 46 | Bob Sibley | | Oil & Gas Operator | Jan 2025 |
| 47 | Bobby Procell | | Oil & Gas Operator | Feb 2001 |
| 48 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 49 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | May 1990 |
| 50 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 51 | BPX (KCS Resources), LLC | | Oil & Gas Operator | Feb 2022 |
| 52 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 53 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 54 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2025 |
| 55 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2024 |
| 56 | Brian C. Register | | Oil & Gas Operator | Jun 2011 |
| 57 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 58 | Brix Operating LLC | | Gas Operator | Apr 2021 |
| 59 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 60 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 61 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 62 | C & C Operating, Inc. | | Oil Operator | Dec 2024 |
| 63 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 64 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 65 | C. W. Brumley | | Oil & Gas Operator | Jun 2006 |
| 66 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Mar 2025 |
| 67 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 68 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 69 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Mar 2025 |
| 70 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 71 | Car-Tex Producing Company | | Oil & Gas Operator | Dec 1994 |
| 72 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 73 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 74 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 75 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 76 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 77 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 78 | Centennial Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 79 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 80 | Century Oil, Inc. | | Oil Operator | Apr 2022 |
| 81 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 82 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 83 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jun 2000 |
| 84 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 85 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 86 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 87 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 88 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 89 | Civego, Inc. | | Oil & Gas Operator | Jul 1994 |
| 90 | Classic Hydrocarbons, Inc. | | Gas Operator | Dec 2007 |
| 91 | Columbia Petroleum Corp. | | Oil & Gas Operator | Jun 1982 |
| 92 | Comco Of Louisiana, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2000 |
| 93 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 94 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 95 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 96 | Condor Energy, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Oct 2021 |
| 97 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 98 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 99 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 100 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2025 |