| 1 | B & M Oilfield Service, Inc. | | Oil Operator | Mar 1999 |
| 2 | B & R Operating Service | | Oil Operator | Jan 1990 |
| 3 | B & S Operating Co. | | Oil Operator | Jun 1996 |
| 4 | B & S Resources LLC | Choctaw, OK 73020 | Oil Operator | Jun 2025 |
| 5 | B&B Oil Rental Tools, Inc. | | Oil Operator | Sep 1994 |
| 6 | Barnett Serio Exploration Co | | Oil & Gas Operator | Oct 1992 |
| 7 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 8 | Bay Gas, LLC | | Oil & Gas Operator | Jun 2025 |
| 9 | Bayou Resources, LLC | | Oil & Gas Operator | Dec 2024 |
| 10 | Beard And Ganey | | Oil & Gas Operator | Oct 1986 |
| 11 | Bech Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1994 |
| 12 | Belle Exploration, Inc. | | Oil & Gas Operator | Jun 2021 |
| 13 | Ben Carroll | | Oil Operator | Dec 1985 |
| 14 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 15 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 16 | Big Joe Operating Company, Inc. | | Oil & Gas Operator | May 2017 |
| 17 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 18 | Big River Oil Field Services, LLC | | Oil Operator | Mar 2017 |
| 19 | Biglane Operating Company | | Oil & Gas Operator | Jun 2025 |
| 20 | Billy P. Bullock-Production | | Oil Operator | Jan 1991 |
| 21 | Blackjack Operating L. L. C. | Cibolo, TX 78108 | Oil & Gas Operator | Oct 2025 |
| 22 | Bob Bertolet | | Oil & Gas Operator | Dec 2001 |
| 23 | Bonanza Salvage & Prod. Co Inc | | Oil & Gas Operator | Oct 2005 |
| 24 | Bradford Oil LLC | | Oil Operator | Jan 2025 |
| 25 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 26 | Bright & Schiff | | Oil & Gas Operator | Dec 1977 |
| 27 | Britlind Oil LLC | | Oil & Gas Operator | Dec 2020 |
| 28 | Brookwater Energy Services, LLC | | Oil & Gas Operator | Dec 2024 |
| 29 | Bud'S Pumping Service Inc. | | Oil Operator | Dec 1997 |
| 30 | Burrill Oil | | Oil Operator | Aug 1990 |
| 31 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |