| 1 | B & B Drilling Co. | Milano, TX 76556 | Oil & Gas Operator | Jul 2015 |
| 2 | B & G Energy Corporation | Dallas, TX 75214 | Oil & Gas Operator | Oct 2025 |
| 3 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Oct 2025 |
| 4 | B.N.B. Production Inc. | Austin, TX 78720 | Oil & Gas Operator | May 1996 |
| 5 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | Oct 2025 |
| 6 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 7 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 8 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 9 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 10 | Baylor Operating, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 11 | Beard Oil Company, LLC | Edna, TX 77957 | Oil & Gas Operator | Oct 2025 |
| 12 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 13 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 14 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 15 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 16 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 17 | Billfisch Exploration Co., Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Oct 1997 |
| 18 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 19 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 20 | Black Pearl Exploration, L.L.C. | Houston, TX 77095 | Oil & Gas Operator | May 2015 |
| 21 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 22 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Oct 2025 |
| 23 | Boling Production Company, Inc. | Boling, TX 77420 | Oil & Gas Operator | Oct 2025 |
| 24 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Oct 2025 |
| 25 | Boney Enterprises Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 26 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 27 | Bozeman, John F. | Rosenberg, TX 77471 | Oil & Gas Operator | Sep 2005 |
| 28 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 29 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | Oct 2025 |
| 30 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 31 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 32 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 33 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 34 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2025 |
| 35 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 36 | Brown, C. Douglas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Dec 2005 |
| 37 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 38 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 39 | Bulldog Exploration, LP | Houston, TX 77090 | Oil & Gas Operator | Apr 2011 |
| 40 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 41 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 42 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 43 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |