| 1 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Oct 2025 |
| 2 | B & T Operating Co. | Dawson, TX 76639 | Oil & Gas Operator | Oct 2025 |
| 3 | B.N.B. Production | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 1993 |
| 4 | B.N.B. Production Inc. | Austin, TX 78720 | Oil & Gas Operator | May 1996 |
| 5 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 7 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 8 | Baseline Oil & Gas Corp. | Houston, TX 77267 | Oil & Gas Operator | Oct 2010 |
| 9 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 10 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 11 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 12 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 13 | Bejo Corporation | Richmond, TX 77407 | Oil & Gas Operator | Oct 2025 |
| 14 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 15 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | Oct 2025 |
| 16 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 17 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 18 | BKN Oil & Gas, Inc. | Port Lavaca, TX 77979 | Gas Operator | Aug 1997 |
| 19 | Black Creek Production Co., Inc. | Driftwood, TX 78619 | Oil & Gas Operator | Feb 2000 |
| 20 | Black Draw Energy LLC | Cypress, TX 77433 | Oil & Gas Operator | Oct 2025 |
| 21 | Blazer Energy Corp. | Alexandria, VA 22314 | Oil & Gas Operator | Dec 2014 |
| 22 | BLS Resources, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Feb 2001 |
| 23 | Bluefin Resources LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2023 |
| 24 | Boester, H. F. | Portland, TX 78374 | Oil & Gas Operator | Aug 2003 |
| 25 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 26 | Bois D'Arc Operating Corporation | Houston, TX 77040 | Oil & Gas Operator | Jan 2000 |
| 27 | Bomco USA, Inc. | Sugar Land, TX 77496 | Oil Operator | Oct 2025 |
| 28 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Oct 2025 |
| 29 | Boss Expl & Prod Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2008 |
| 30 | Boundary Ventures, Inc. | Columbus, TX 78934 | Oil Operator | Oct 2025 |
| 31 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 32 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 33 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 34 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 35 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 36 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 37 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2025 |
| 38 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 39 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 40 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |