| 1 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2023 |
| 2 | Acacia Operating, LLC | | Oil & Gas Operator | Jul 2023 |
| 3 | Ace Energy LLC | Leawood, KS 66211 | Oil & Gas Operator | Jul 2023 |
| 4 | Achilles Oil, LLC | | Oil & Gas Operator | Jun 2023 |
| 5 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 6 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 7 | Adco Producing Company | | Oil & Gas Operator | Mar 1989 |
| 8 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2023 |
| 9 | Albert E. Smith Oil | | Oil Operator | Jul 2023 |
| 10 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 11 | Alpine Gas Operator, LLC | | Oil & Gas Operator | Jul 2023 |
| 12 | Alpine Well Service Inc | | Oil & Gas Operator | Jul 2023 |
| 13 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 14 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 15 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 16 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 17 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2023 |
| 18 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 19 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 20 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Sep 2023 |
| 21 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 22 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 23 | Australis TMS Inc. | | Oil & Gas Operator | Jun 2023 |
| 24 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2023 |
| 25 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 26 | Barnhart Co LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2023 |
| 27 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Sep 2023 |
| 28 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 29 | Bay Gas, LLC | | Oil & Gas Operator | Jul 2023 |
| 30 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 31 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 32 | Beaver Operating Company, LLC | | Oil & Gas Operator | Jul 2023 |
| 33 | Belle Oil, Inc. | | Oil & Gas Operator | Jul 2023 |
| 34 | Betsy Production Company, Inc. | Magnolia, AR 71753 | Oil & Gas Operator | Jul 2023 |
| 35 | Big Joe Operating Company, Inc. | | Oil & Gas Operator | May 2017 |
| 36 | Big Run Production Company | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 37 | Biglane Operating Company | | Oil & Gas Operator | Jul 2023 |
| 38 | Black Gold Production Co. Inc. | | Oil & Gas Operator | Feb 1998 |
| 39 | Black Horse Resources, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2023 |
| 40 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Jul 2023 |
| 41 | Black Snake Petroleum, LLC | | Oil & Gas Operator | Jul 2023 |
| 42 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2023 |
| 43 | Briggs Operating Company | | Oil & Gas Operator | Nov 1998 |
| 44 | Browning & Welch, Inc. | | Oil & Gas Operator | Mar 2005 |
| 45 | Bruxoil Inc | | Oil & Gas Operator | Jun 2023 |
| 46 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2023 |
| 47 | Bulldog Operating Company LLC | Shreveport, LA 71101-3680 | Oil & Gas Operator | Jun 2015 |
| 48 | Burnsed Oil Co., Inc. | | Oil & Gas Operator | Jul 2023 |
| 49 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Oct 2002 |
| 50 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 51 | Cardneaux Inc. | | Oil & Gas Operator | Aug 2009 |
| 52 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2023 |
| 53 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 54 | Central Operating, LLC | | Oil & Gas Operator | Jun 2023 |
| 55 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 56 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 57 | Cimarex Energy Co | Midland, TX 79701 | Oil & Gas Operator | Sep 2023 |
| 58 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Sep 2023 |
| 59 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 60 | Clarkco Services, Inc. | | Oil & Gas Operator | Jun 2023 |
| 61 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 62 | Cleveland Production Company | Summit, MS 39666 | Oil & Gas Operator | Jul 1999 |
| 63 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2023 |
| 64 | Cody Operating, Inc. | | Oil & Gas Operator | Jul 2023 |
| 65 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 66 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | May 2023 |
| 67 | Columbia Petroleum LLC | Brookhaven, MS 39601 | Oil & Gas Operator | May 2023 |
| 68 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 69 | Conquest Exploration Co. | Houston, TX 77010-3088 | Oil & Gas Operator | May 2000 |
| 70 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 71 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 72 | Dale Exploration Company | | Oil & Gas Operator | May 2004 |
| 73 | Dallas Production Company LLC | Dallas, TX 75206-5038 | Oil & Gas Operator | Sep 2023 |
| 74 | David New Operating Co., Inc. | | Oil & Gas Operator | Feb 1999 |
| 75 | Day Dreams Resources, LLC | | Oil & Gas Operator | Jul 2023 |
| 76 | Delphi Oil, Inc. | Delphi, IN 46923 | Oil & Gas Operator | May 2023 |
| 77 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 78 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2023 |
| 79 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 80 | Diamondhead Oil Co., LLC | | Oil & Gas Operator | Jul 2023 |
| 81 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 82 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 83 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 84 | Durango Operating, LLC | Ridgeland, MS 39157-5109 | Oil & Gas Operator | Jun 2023 |
| 85 | E2 Operating LLC | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2023 |
| 86 | El Toro Production Co., Inc. | | Oil & Gas Operator | Jan 2016 |
| 87 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2023 |
| 88 | Elite Group LLC | | Oil & Gas Operator | Jul 2023 |
| 89 | Emerge Operating,LLC | | Oil & Gas Operator | Jun 2023 |
| 90 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 91 | Energy Exploration Company | | Oil & Gas Operator | Feb 1991 |
| 92 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 93 | Energy Resources Corp. | | Oil & Gas Operator | Jul 2023 |
| 94 | EOG Resources Inc | Houston, TX 77210 | Oil & Gas Operator | Sep 2023 |
| 95 | Eor, LLC | | Oil & Gas Operator | Nov 2013 |
| 96 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 97 | Escambia Operating Co. LLC | Gulfport, MS 39501 | Oil & Gas Operator | Apr 2023 |
| 98 | Ethyl Properties Inc. | | Oil & Gas Operator | Aug 1989 |
| 99 | Exchange Exploration & Production Co. | Dallas, TX 75219 | Oil & Gas Operator | Jul 2023 |
| 100 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2023 |