| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Jan 2024 |
| 2 | Abarr Trust (The) | Oklahoma City, OK 73123-0084 | Oil & Gas Operator | Jan 2024 |
| 3 | Abercrombie, A. L., Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2023 |
| 4 | Abps Energy Inc | Chickasha, OK 73023-1658 | Oil & Gas Operator | Apr 2015 |
| 5 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 6 | Adams Res & Energy Co | Houston, TX 77001-0844 | Oil & Gas Operator | Mar 2015 |
| 7 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 8 | Advent Oil & Operating Inc | Gulfport, MS 39506-7115 | Oil & Gas Operator | Nov 2014 |
| 9 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2024 |
| 10 | Agar & Agar Inc | Norman, OK 73070 | Oil & Gas Operator | Oct 1996 |
| 11 | Aikman Brothers LLC | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2023 |
| 12 | Akin Jr Verna M & Emsley F | Maud, OK 74854 | Oil & Gas Operator | Apr 2002 |
| 13 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2021 |
| 14 | Albritton Resources Inc | Dallas, TX 75206 | Oil & Gas Operator | Feb 2001 |
| 15 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 16 | All Exploration LLC | Oklahoma City, OK 73120-7829 | Oil & Gas Operator | Dec 2023 |
| 17 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 18 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 19 | American Domestic MGMT Inc | Tulsa, OK 74155 | Oil & Gas Operator | Apr 2015 |
| 20 | American Petrofina Co Of TX | Dallas, TX 75221-2159 | Oil & Gas Operator | Nov 2000 |
| 21 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 22 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Dec 2023 |
| 23 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 24 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 25 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 26 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 27 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 28 | Ancova Energy Marketing LLC | | Oil & Gas Operator | Dec 2023 |
| 29 | Angel Exploration LLC | Oklahoma City, OK 73116-3603 | Oil & Gas Operator | Jan 2024 |
| 30 | Anr Pipeline Company | Detroit, MI 48243 | Oil & Gas Operator | Dec 2023 |
| 31 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 32 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 33 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 34 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 35 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 36 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 37 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 38 | Arco Pipe Line Company | Independence, KS 67301 | Oil & Gas Operator | Jun 1996 |
| 39 | Armor Energy LLC | Waco, TX 76705 | Oil & Gas Operator | Jun 2022 |
| 40 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 41 | Arrow Energy Inc | Houston, TX 77008 | Oil & Gas Operator | Jan 2024 |
| 42 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2024 |
| 43 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 44 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 45 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 46 | Associated Trans & Trading Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1998 |
| 47 | Atchley Resources Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2024 |
| 48 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Apr 2024 |
| 49 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 50 | Auora Natural Gas & Assoc Prod | Dallas, TX 75205 | Oil & Gas Operator | Dec 2000 |
| 51 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Apr 2024 |
| 52 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |