| 1 | 19TH Hole Production, LLC | Humble, TX 77346 | Oil & Gas Operator | Sep 2025 |
| 2 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | Sep 2025 |
| 3 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Sep 2025 |
| 4 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2025 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2025 |
| 6 | Allied Operating Texas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 7 | Allied-Gulf Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Sep 2025 |
| 8 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 9 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 10 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 11 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 12 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 13 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Sep 2025 |
| 14 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 15 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jun 2025 |
| 16 | Anloc, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2019 |
| 17 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 18 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 19 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2025 |
| 20 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 21 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 22 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 23 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 24 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 25 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 26 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Sep 2025 |
| 27 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 28 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 29 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 30 | Bagley, Roy | Magnolia, TX 77354 | Oil & Gas Operator | Sep 2025 |
| 31 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 32 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | Jul 2025 |
| 33 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 34 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 35 | BDH Technology, Inc. | Conroe, TX 77304 | Oil & Gas Operator | Mar 2001 |
| 36 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 37 | Benchmark Oil & Gas Co. | Houston, TX 77282 | Oil & Gas Operator | Sep 2025 |
| 38 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 39 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 40 | Big Easy Operating Company | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 41 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 42 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 43 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Sep 2025 |
| 44 | Bomco USA, Inc. | Sugar Land, TX 77496 | Oil Operator | Sep 2025 |
| 45 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Sep 2025 |
| 46 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 47 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 48 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 49 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 50 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 51 | Brooklyn Union Explor. Co., Inc. | Houston, TX 77010 | Oil & Gas Operator | Jan 1994 |
| 52 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 2025 |
| 53 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 54 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 55 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 56 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 57 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 58 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 59 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 60 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 61 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 62 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 63 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 64 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Sep 2025 |
| 65 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 66 | Chilton Energy | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2006 |
| 67 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Sep 2025 |
| 68 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 69 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Sep 2025 |
| 70 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 71 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 72 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 73 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 74 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 75 | Cokinos, Inc. | Beaumont, TX 77701 | Oil & Gas Operator | Aug 2003 |
| 76 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 77 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 78 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 79 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 80 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 81 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Sep 2025 |
| 82 | Cornerstone Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2011 |
| 83 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 84 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Sep 2025 |
| 85 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 86 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 87 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 88 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2025 |
| 89 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 90 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 91 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2025 |
| 92 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Sep 2025 |
| 93 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 94 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 95 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Sep 2025 |
| 96 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 97 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Sep 2025 |
| 98 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 99 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 100 | Denali Oil & Gas Management, LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |