| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | Achilles Oil, LLC | | Oil & Gas Operator | Jun 2025 |
| 3 | Adco Producing Company | | Oil & Gas Operator | Mar 1989 |
| 4 | Alagood & Alagood | | Oil & Gas Operator | May 1981 |
| 5 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 6 | Allen Petroleum Company | | Oil Operator | Apr 1996 |
| 7 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 8 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 9 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 10 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 11 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 12 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 13 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 14 | B & M Oilfield Service, Inc. | | Oil Operator | Mar 1999 |
| 15 | B & R Operating Service | | Oil Operator | Jan 1990 |
| 16 | B & S Operating Co. | | Oil Operator | Jun 1996 |
| 17 | B & S Resources LLC | Choctaw, OK 73020 | Oil Operator | Jun 2025 |
| 18 | B&B Oil Rental Tools, Inc. | | Oil Operator | Sep 1994 |
| 19 | Barnett Serio Exploration Co | | Oil & Gas Operator | Oct 1992 |
| 20 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 21 | Bay Gas, LLC | | Oil & Gas Operator | Jun 2025 |
| 22 | Bayou Resources, LLC | | Oil & Gas Operator | Dec 2024 |
| 23 | Beard And Ganey | | Oil & Gas Operator | Oct 1986 |
| 24 | Bech Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1994 |
| 25 | Belle Exploration, Inc. | | Oil & Gas Operator | Jun 2021 |
| 26 | Ben Carroll | | Oil Operator | Dec 1985 |
| 27 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 28 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 29 | Big Joe Operating Company, Inc. | | Oil & Gas Operator | May 2017 |
| 30 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 31 | Big River Oil Field Services, LLC | | Oil Operator | Mar 2017 |
| 32 | Biglane Operating Company | | Oil & Gas Operator | Jun 2025 |
| 33 | Billy P. Bullock-Production | | Oil Operator | Jan 1991 |
| 34 | Blackjack Operating L. L. C. | Cibolo, TX 78108 | Oil & Gas Operator | Oct 2025 |
| 35 | Bob Bertolet | | Oil & Gas Operator | Dec 2001 |
| 36 | Bonanza Salvage & Prod. Co Inc | | Oil & Gas Operator | Oct 2005 |
| 37 | Bradford Oil LLC | | Oil Operator | Jan 2025 |
| 38 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 39 | Bright & Schiff | | Oil & Gas Operator | Dec 1977 |
| 40 | Britlind Oil LLC | | Oil & Gas Operator | Dec 2020 |
| 41 | Brookwater Energy Services, LLC | | Oil & Gas Operator | Dec 2024 |
| 42 | Bud'S Pumping Service Inc. | | Oil Operator | Dec 1997 |
| 43 | Burrill Oil | | Oil Operator | Aug 1990 |
| 44 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 45 | C & F Oil Company, Inc. | | Oil Operator | Jan 2025 |
| 46 | C. A. Cardneaux, Inc. | | Oil & Gas Operator | Apr 1990 |
| 47 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 48 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jan 2025 |
| 49 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 50 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 51 | Campbell & Associates | | Oil & Gas Operator | Aug 1987 |
| 52 | Cardneaux Inc. | | Oil & Gas Operator | Aug 2009 |
| 53 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 54 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 55 | Charles M. Nolan | | Oil Operator | Aug 1984 |
| 56 | Chester Floyd | | Oil Operator | Feb 1996 |
| 57 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 58 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jun 2025 |
| 59 | Concor Petroleum, Inc. | | Oil & Gas Operator | Feb 1983 |
| 60 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 61 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 62 | D & D DRLG Co & Saye Oil Co | | Oil Operator | Apr 1982 |
| 63 | D & J Producing Company | | Oil Operator | Sep 2006 |
| 64 | D. A. Biglane | | Oil & Gas Operator | Feb 1990 |
| 65 | Dale Expl Co & R. A. Campbell | | Oil Operator | Nov 1995 |
| 66 | Dale Exploration Company | | Oil & Gas Operator | May 2004 |
| 67 | Dale O. Reese | | Oil Operator | Nov 1989 |
| 68 | Dale O. Reese, Inc. | | Oil Operator | Jul 1997 |
| 69 | Dalton J. Woods | | Oil & Gas Operator | Dec 1985 |
| 70 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 71 | Dave Easom Production Co. Inc. | | Oil & Gas Operator | May 2000 |
| 72 | David New Operating Co., Inc. | | Oil & Gas Operator | Feb 1999 |
| 73 | Davis & Kaiser Operating, Inc. | | Oil Operator | May 2004 |
| 74 | Day Dreams Resources, LLC | | Oil & Gas Operator | Jul 2025 |
| 75 | Deblin Operating LTD | | Oil & Gas Operator | Jan 1997 |
| 76 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 77 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 78 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 79 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 80 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 81 | Domestic Oil Producers,Inc. | | Oil Operator | Oct 1998 |
| 82 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 83 | E. L. Larry | | Oil & Gas Operator | Mar 1989 |
| 84 | Easom-Middleton Operating, Inc | | Oil & Gas Operator | Sep 1992 |
| 85 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 86 | El Toro Production Co., Inc. | | Oil & Gas Operator | Jan 2016 |
| 87 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 88 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 89 | Energy Exploration Company | | Oil & Gas Operator | Feb 1991 |
| 90 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 91 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 92 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 93 | Eram, Inc. | | Oil & Gas Operator | Dec 2024 |
| 94 | Erwin W. Saye | | Oil & Gas Operator | Apr 1979 |
| 95 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 96 | Ethyl Properties Inc. | | Oil & Gas Operator | Aug 1989 |
| 97 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 98 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 99 | Fi-Ro Corporation | Natchez, MS BADADDR | Oil & Gas Operator | Nov 2001 |
| 100 | Fife Oil & Gas, Inc. | | Oil Operator | Mar 1991 |