| 1 | 4D Energy Co. | Sterling City, TX 76951 | Oil & Gas Operator | Feb 2007 |
| 2 | 7S Oil & Gas, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2019 |
| 3 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 4 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 5 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 6 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 7 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 9 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 10 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2025 |
| 11 | Anegada Resources | Kerrville, TX 78029 | Oil & Gas Operator | Jan 2002 |
| 12 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 13 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Feb 2026 |
| 14 | Arch Oil & Gas, LLC | Ennis, TX 75119 | Oil & Gas Operator | Feb 2026 |
| 15 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 16 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Feb 2026 |
| 17 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 18 | Associated Operating & Explor. | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 19 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 20 | Atoka Operating Permian, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2023 |
| 21 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Feb 2026 |
| 22 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 23 | Atropos Production Corporation | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 24 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2026 |
| 25 | Baker Operating, Inc. | Odessa, TX 79764 | Oil & Gas Operator | Feb 2026 |
| 26 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 27 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Feb 2026 |
| 28 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 29 | Baylor Operating, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 30 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 31 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 32 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 33 | Bennett, R. C., Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 34 | Berry Patterson Enterprises, LLC | Smyer, TX 79367 | Oil Operator | Feb 2026 |
| 35 | Big Star Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2017 |
| 36 | Black River Operating LLC | Keller, TX 76248 | Oil & Gas Operator | Feb 2026 |
| 37 | Blackmun Family Partners, L.P. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 38 | Blue Ridge Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 39 | Blue Star Natural Resources, LLC | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 40 | Bob Hughes Oil Company, LLC | San Angelo, TX 76901 | Oil & Gas Operator | Feb 2026 |
| 41 | Bolding Energy, LLC | Sterling City, TX 76951 | Oil & Gas Operator | Feb 2026 |
| 42 | Bosque Texas Oil LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 43 | Boyd, Foy Associates, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 44 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | Feb 2026 |
| 45 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 46 | Breitling Operating Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2016 |
| 47 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 48 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 49 | Brown, H. L., Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2002 |
| 50 | Burgundy Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 51 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 52 | Burleson Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 53 | Bustamante Oil Company | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 54 | Bustamante Resources LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 55 | BVX Operating, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 56 | Campana Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 57 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 58 | Caraway Operating Co. | San Angelo, TX 76902 | Oil & Gas Operator | Feb 2026 |
| 59 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 60 | Chambers Operating, Inc. | Westbrook, TX 79565 | Oil & Gas Operator | Mar 2006 |
| 61 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 62 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 63 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 64 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 65 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 66 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 67 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 68 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Feb 2026 |
| 69 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 70 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 71 | Cochise Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 72 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 73 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Dec 2025 |
| 74 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 75 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 76 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 77 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 78 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Feb 2026 |
| 79 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 80 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 81 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 82 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 83 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 84 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 85 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 86 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 87 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2026 |
| 88 | D & D Enterprises | Post, TX 79356 | Oil & Gas Operator | Feb 2026 |
| 89 | D & D Well Service, L.L.C. | Post, TX 79356 | Oil Operator | Feb 2026 |
| 90 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 91 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 92 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 93 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 94 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 95 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 96 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 97 | Double Diamond Petroleum, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 98 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2026 |
| 99 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 100 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |