| 1 | B & B Enterprises | | Oil Operator | Jan 2025 |
| 2 | B & F Operating Company, Inc. | | Oil & Gas Operator | Mar 1995 |
| 3 | Bach Energy Corporation | | Oil & Gas Operator | Jul 1992 |
| 4 | Backus,Barnwell& Von Gonten | | Oil & Gas Operator | Oct 1984 |
| 5 | Barnwell Oil Company, Inc. | | Oil & Gas Operator | Sep 1991 |
| 6 | Barnwell Petroleum Corp. | | Oil & Gas Operator | Sep 1978 |
| 7 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 8 | BCF Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 9 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 10 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 11 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 12 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 13 | BHP Billiton Petro (Txla Operating) Co. | | Gas Operator | Jul 2019 |
| 14 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 15 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 16 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 17 | Black Bear Midstream LLC | | Oil Operator | Jan 2025 |
| 18 | Black Gold Production Company | | Oil & Gas Operator | Feb 1998 |
| 19 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 20 | Blue Creek Resources, Inc. | | Oil & Gas Operator | May 1990 |
| 21 | BMR Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 22 | Bob R. Hyde Co. | | Oil Operator | May 1986 |
| 23 | Bob Sibley | | Oil & Gas Operator | Jan 2025 |
| 24 | Bobby Procell | | Oil & Gas Operator | Feb 2001 |
| 25 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 26 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | May 1990 |
| 27 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 28 | BPX (KCS Resources), LLC | | Oil & Gas Operator | Feb 2022 |
| 29 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 30 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 31 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 32 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 33 | Brian C. Register | | Oil & Gas Operator | Jun 2011 |
| 34 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 35 | Brix Operating LLC | | Gas Operator | Apr 2021 |
| 36 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 37 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 38 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |