| 1 | Acadian Gas Pipeline System | | Oil Operator | Jul 2024 |
| 2 | Alpine Expl. Companies, Inc. | | Oil & Gas Operator | Jan 2024 |
| 3 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 4 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 5 | American Trading | | Oil & Gas Operator | Dec 1995 |
| 6 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 7 | American Trading Et Al | | Oil & Gas Operator | May 1979 |
| 8 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 9 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 11 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 12 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 13 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 14 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 15 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 16 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 17 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Sep 2024 |
| 18 | B K L Incorporated | Morton, TX 79346 | Oil & Gas Operator | Jun 2002 |
| 19 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 20 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 21 | Bob Bertolet | | Oil & Gas Operator | Dec 2001 |
| 22 | Boca Production Inc | | Oil & Gas Operator | Jun 2002 |
| 23 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | Mar 1990 |
| 24 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 25 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 26 | Brooklyn Union Expl. Co., Inc. | | Oil & Gas Operator | Jul 1994 |
| 27 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 28 | C & K Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1984 |
| 29 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 30 | California Time Petroleum, Inc | | Oil Operator | Mar 1986 |
| 31 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 32 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 33 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 34 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 35 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2024 |
| 36 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 37 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 38 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 39 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 40 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 41 | Clayton W. Williams, Jr. | | Oil & Gas Operator | Sep 1986 |
| 42 | Clayton W. Williams, Jr., Inc. | | Oil & Gas Operator | May 1993 |
| 43 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 44 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 45 | Coastal Plains Exploration, LLC | Port Lavaca, TX 77979 | Oil & Gas Operator | Nov 2024 |
| 46 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 47 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2024 |
| 48 | Creek Operating Company, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Sep 1998 |
| 49 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 50 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 51 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 52 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 53 | D. B. McClinton | | Oil & Gas Operator | Jun 1992 |
| 54 | Dalco Petroleum, Inc | | Oil & Gas Operator | Jan 2006 |
| 55 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 56 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Nov 2024 |
| 57 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 58 | Delta Petroleum Corp Of Co | | Oil & Gas Operator | Oct 2010 |
| 59 | Dew Oil And Gas Co.,Inc. | | Oil & Gas Operator | Dec 1989 |
| 60 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 61 | Edgewater Oil Co. Inc. | | Oil & Gas Operator | Jul 1995 |
| 62 | El Paso Exploration Company | | Oil & Gas Operator | Jul 1985 |
| 63 | Elmwood Operating LLC | | Oil & Gas Operator | May 2024 |
| 64 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 65 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2024 |
| 66 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 67 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 68 | Enlink Lig, LLC | | Oil Operator | Jul 2024 |
| 69 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 70 | F W Rabalais, Inc. | | Oil & Gas Operator | Dec 2014 |
| 71 | Far West Development, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2024 |
| 72 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jun 2024 |
| 73 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Nov 2024 |
| 74 | Fordoche Operating Company, LLC | | Oil & Gas Operator | Jun 2024 |
| 75 | Gas Gathering Corp. | | Oil Operator | Oct 1997 |
| 76 | Gas Producing Enterprises Inc. | | Oil & Gas Operator | Oct 1985 |
| 77 | Gas Rock Corporation | | Oil Operator | Mar 1983 |
| 78 | Gde Investments La, L.L.C. | | Oil & Gas Operator | Jun 2024 |
| 79 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 80 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 81 | Great Yellowstone Corp. | | Oil & Gas Operator | Apr 1993 |
| 82 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 83 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 84 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 85 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 86 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 87 | Henderson Oil & Gas | | Oil Operator | Sep 1990 |
| 88 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 89 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2024 |
| 90 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 91 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 92 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 93 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2024 |
| 94 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 95 | JFD,Inc | Houston, TX 77041-6914 | Oil & Gas Operator | Feb 2000 |
| 96 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2019 |
| 97 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 98 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Nov 2024 |
| 99 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 100 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2024 |