| 1 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | Feb 2026 |
| 2 | A T M Corporation | Mathis, TX 78368 | Oil & Gas Operator | Oct 2002 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Feb 2026 |
| 4 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 5 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 6 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 7 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 8 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 9 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Feb 2026 |
| 10 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 11 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 12 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 13 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 14 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 15 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 16 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 17 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 18 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 19 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 20 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 21 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 22 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 23 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2026 |
| 24 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 25 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 26 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 27 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2009 |
| 28 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 29 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 30 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 31 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 32 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Feb 2026 |
| 33 | B.N.B. Production | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 1993 |
| 34 | B.N.B. Production Inc. | Austin, TX 78720 | Oil & Gas Operator | May 1996 |
| 35 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | Feb 2026 |
| 36 | Bandera Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2017 |
| 37 | Barbee, R.L. Operating, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Feb 2026 |
| 38 | Barrett Brothers Oil And Gas | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1995 |
| 39 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 40 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 41 | BB-Southtex, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2024 |
| 42 | Beachtex Oil Company, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Feb 2026 |
| 43 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Feb 2026 |
| 44 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 45 | Bennett, Mills Estate | Houston, TX 77057 | Oil & Gas Operator | Sep 1995 |
| 46 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2026 |
| 47 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 48 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 49 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 50 | Billington Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 51 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Feb 2026 |
| 52 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Feb 2026 |
| 53 | Blanco Oil Co. | San Antonio, TX 78230 | Oil & Gas Operator | Feb 2004 |
| 54 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Feb 2026 |
| 55 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Feb 2026 |
| 56 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2026 |
| 57 | Bodden Production | Poth, TX 78147 | Oil & Gas Operator | Feb 2026 |
| 58 | Botasch Operating, LLC | Dilley, TX 78017 | Oil & Gas Operator | Feb 2026 |
| 59 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 60 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 61 | Bralex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 62 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 63 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 64 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 65 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 66 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 67 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | Feb 2026 |
| 68 | Brown, Russell Operator, Inc. | Alice, TX 78333 | Oil & Gas Operator | Feb 2026 |
| 69 | Buccaneer Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 70 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 71 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 72 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 73 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 74 | Burton, V.C. Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2016 |
| 75 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 76 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Feb 2026 |
| 77 | C.F.O., Inc. | Liberty, TX 77575 | Oil Operator | Feb 2026 |
| 78 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 79 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 80 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 81 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 82 | Carburante Exploration Co, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 83 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 84 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 85 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 86 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 87 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 88 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 89 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Feb 2026 |
| 90 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Feb 2026 |
| 91 | Centex Development | Giddings, TX 78942 | Oil & Gas Operator | Feb 2026 |
| 92 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 93 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 94 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | Feb 2026 |
| 95 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 96 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2026 |
| 97 | Chesnutt Oil & Gas, Inc. | Mineral, TX 78125 | Oil & Gas Operator | Feb 2026 |
| 98 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Feb 2026 |
| 99 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Feb 2026 |
| 100 | CHP Oil & Gas Company, L.C. | El Campo, TX 77437 | Oil & Gas Operator | Feb 2026 |