| 1 | 3-M Energy Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2017 |
| 2 | 7S Oil & Gas, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2019 |
| 3 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 4 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 5 | Allison Lease Services LLC | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 6 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 7 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 8 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 9 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 10 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 11 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 12 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 13 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 14 | Antelope Production Co. | Midland, TX 79701 | Oil & Gas Operator | Oct 1995 |
| 15 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 16 | Apex Operating Partners, LLC | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 17 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 18 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 19 | Arden Energy Partners, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2013 |
| 20 | Ares Energy, LTD. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 21 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 22 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 23 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 24 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 25 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 26 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 27 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 28 | B & R Operating, LLC | San Angelo, TX 76903 | Oil & Gas Operator | Jan 2007 |
| 29 | Banner Operating, LLC | Austin, TX 78735 | Oil & Gas Operator | Oct 2025 |
| 30 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 31 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 32 | Baytech Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 33 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 34 | Berry, O. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 35 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 36 | Bex, Inc. | Nashville, TN 37209 | Oil & Gas Operator | Aug 2007 |
| 37 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 38 | Black Mountain SWD LP | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 39 | Blue Star Natural Resources, LLC | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 40 | Bluemark Energy, LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 41 | Boaz Energy II Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 42 | Bob Hughes Oil Company, LLC | San Angelo, TX 76901 | Oil & Gas Operator | Oct 2025 |
| 43 | Bold Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2019 |
| 44 | Bolding Energy, LLC | Sterling City, TX 76951 | Oil & Gas Operator | Oct 2025 |
| 45 | Bomar Operating Co., LC | Bellaire, TX 77401 | Oil & Gas Operator | Oct 2025 |
| 46 | Boyd & McWilliams Energy Group | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 47 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 48 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 49 | Breeze Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 50 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 51 | Broad Oak Energy II, LLC | Irving, TX 75063 | Oil & Gas Operator | Mar 2018 |
| 52 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2025 |
| 53 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 54 | BRP Energy, LLC | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 55 | Burgundy Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 56 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 57 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 58 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 59 | Bustamante Oil Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 60 | Bynum Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2003 |
| 61 | Byrd Operating Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 62 | C & M Exploration LLC | Tulsa, OK 74159-1331 | Oil & Gas Operator | Jun 2014 |
| 63 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Oct 2025 |
| 64 | Caraway Operating Co. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 65 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 66 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 67 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 68 | Central Texas Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 69 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 70 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 71 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 72 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 73 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 74 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 75 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 76 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 77 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 78 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 79 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 80 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 81 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 82 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 83 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 84 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 85 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Oct 2025 |
| 86 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 87 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 88 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 89 | Coppertop | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 90 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 91 | Core Petro, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 92 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 93 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 94 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 95 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 96 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 97 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 98 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 99 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 100 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |