| 1 | Aberdeen American Petroleum Co., Inc. | | Oil & Gas Operator | Dec 1989 |
| 2 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 3 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 4 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 5 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 6 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 7 | All Oil & Gas Inc. | | Oil & Gas Operator | Jul 1989 |
| 8 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 9 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 10 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 11 | Annco Pet. Co & Equipment, Inc | | Oil & Gas Operator | Sep 1982 |
| 12 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 13 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2025 |
| 14 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 15 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 16 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2022 |
| 17 | Austral Oil & Exploration, Inc | | Oil & Gas Operator | Jun 2004 |
| 18 | Avanti Exploration La, LLC | | Oil & Gas Operator | Nov 2024 |
| 19 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 20 | Bayshore Exploration LLC | Bellville, TX 77418 | Oil & Gas Operator | Dec 2016 |
| 21 | Beauregard Production Co Inc | | Oil Operator | Dec 2014 |
| 22 | Belle Oil, Inc. | | Oil & Gas Operator | Dec 2024 |
| 23 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 24 | BHP Petroleum, Inc. | | Oil & Gas Operator | Aug 1985 |
| 25 | Black Pearl Exploration, L.L.C. | Houston, TX 77095 | Oil & Gas Operator | May 2015 |
| 26 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2021 |
| 27 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 28 | Bonanza Salvage & Prod. Co Inc | | Oil & Gas Operator | Oct 2005 |
| 29 | BPR Energy, Inc. | | Oil & Gas Operator | Apr 2021 |
| 30 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 31 | Brechtel Energy Corporation | | Oil & Gas Operator | Sep 2008 |
| 32 | Bridwell Oil Management, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 33 | Bridwell Oil MGMT Of Al, LLC | | Oil & Gas Operator | Apr 2006 |
| 34 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 35 | Bright & Schiff | | Oil & Gas Operator | Dec 1977 |
| 36 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 37 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 38 | C & B Exploration Company, Inc. | | Oil & Gas Operator | Oct 2008 |
| 39 | C & D Resources, Inc. | | Oil & Gas Operator | Nov 2001 |
| 40 | C & VC, Inc. | | Oil & Gas Operator | Sep 1991 |
| 41 | C. L. Brown, III | | Oil Operator | Dec 1991 |
| 42 | C. L. Brown, Inc. | | Oil Operator | Dec 1999 |
| 43 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jan 2025 |
| 44 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Mar 2025 |
| 45 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 46 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 47 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 48 | Caribe Resources, Inc. | | Oil & Gas Operator | Jan 1985 |
| 49 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 50 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 51 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 52 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |
| 53 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 54 | Central Crude, Inc. | | Oil & Gas Operator | Jul 2014 |
| 55 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 56 | Charleston Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1997 |
| 57 | Cheniere Petroleum Corporation | | Oil & Gas Operator | Feb 1989 |
| 58 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 59 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 60 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 61 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 62 | CNG Producing Co.-Tulsa Div. | | Oil & Gas Operator | Jun 1986 |
| 63 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 64 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 65 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 66 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 67 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 68 | Covey Energy, Inc. | | Oil & Gas Operator | Jun 1998 |
| 69 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 70 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 71 | CPBG, LLC | | Oil Operator | Oct 2019 |
| 72 | Crebbs Oil Company | Batson, TX 77519 | Oil & Gas Operator | Jun 2024 |
| 73 | Crescent DRLG & DVLPMNT, Inc. | | Oil & Gas Operator | Oct 1992 |
| 74 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 75 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 76 | D & V Petroleum Corporation | | Oil & Gas Operator | May 1992 |
| 77 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 78 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 79 | Darsey Operating Corporation | | Oil & Gas Operator | Sep 1990 |
| 80 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Mar 2025 |
| 81 | DBL DRLG.&Prod. Services, Inc. | | Oil & Gas Operator | Jul 1997 |
| 82 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 83 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 84 | Despot Production Company | | Oil & Gas Operator | May 1983 |
| 85 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 86 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 87 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 88 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 89 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 90 | Donald J. Zadeck | | Oil & Gas Operator | Feb 1998 |
| 91 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 92 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 93 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 94 | E. L. Cox And Stanrich Oil Co. | | Oil & Gas Operator | Jul 1981 |
| 95 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 96 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 97 | Empire Louisiana LLC Of Delaware | | Oil & Gas Operator | Dec 2024 |
| 98 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Nov 2024 |
| 99 | Energy Prod Management Corp | | Oil & Gas Operator | Oct 1991 |
| 100 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2024 |