| 1 | 20TH Century Pipe & Equip.Co.Inc | | Oil & Gas Operator | Aug 2003 |
| 2 | 3-M Energy Corporation | San Angelo, TX 76902-3986 | Oil & Gas Operator | Jun 2017 |
| 3 | 7S Oil & Gas, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2019 |
| 4 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Jun 2020 |
| 5 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 6 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 7 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2000 |
| 8 | Ameredev Operating, LLC | Austin, TX 78735 | Oil & Gas Operator | Feb 2020 |
| 9 | American Exploration Company | Houston, TX 77010-3088 | Oil & Gas Operator | Jan 2000 |
| 10 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 11 | Anadarko Petroleum Corporation | Houston, TX 77251-1330 | Oil & Gas Operator | Feb 2020 |
| 12 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Jun 2020 |
| 13 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Jun 2020 |
| 14 | Arch Oil & Gas, LLC | Dallas, TX 75248-2609 | Oil & Gas Operator | Jun 2020 |
| 15 | Arco Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 16 | Armor Petroleum, Inc. | Wichita Falls, TX 76308-625 | Oil & Gas Operator | Jun 2020 |
| 17 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | May 2008 |
| 18 | Associated Operating & Explor. | | Oil & Gas Operator | Jun 2020 |
| 19 | Atapco | | Oil & Gas Operator | Feb 1999 |
| 20 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 21 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 22 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 23 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2020 |
| 24 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Jun 2020 |
| 25 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2020 |
| 26 | B & B Operating Company | Hallett, OK 74034-0147 | Oil & Gas Operator | Jun 2020 |
| 27 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Jun 2020 |
| 28 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2012 |
| 29 | Baytech, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 30 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 31 | Beach Oil & Gas, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jun 2020 |
| 32 | Bennett, M. Brad Inc. | | Oil & Gas Operator | Dec 2005 |
| 33 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 34 | Black Mountain Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 35 | Blanco Engineering Inc. | Artesia, NM 88210 | Oil & Gas Operator | Feb 1997 |
| 36 | Boaz Energy II Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2020 |
| 37 | Bold Operating, LLC | The Woodlands, TX 77381-1197 | Oil & Gas Operator | May 2019 |
| 38 | Boyd, D. K. Oil And Gas Co.,Inc. | Midland, TX 79703 | Oil & Gas Operator | Jun 2020 |
| 39 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2020 |
| 40 | Bracken Production Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 1995 |
| 41 | Brahaney Drilling Co. | | Oil & Gas Operator | Feb 2014 |
| 42 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2020 |
| 43 | Breitburn Operating, LP | Houston, TX 77002 | Oil & Gas Operator | Dec 2020 |
| 44 | Bright & Co. | Dallas, TX 752066534 | Oil & Gas Operator | May 2015 |
| 45 | Bristol Resources Corp. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2000 |
| 46 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Jun 2020 |
| 47 | Brown, H. L., Jr. | | Oil & Gas Operator | Jul 2001 |
| 48 | Browning Oil Company, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2020 |
| 49 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 50 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 51 | Burkholder, Terry L., Inc. | | Oil & Gas Operator | Mar 2002 |
| 52 | Burlington Res O&G Co-Permian | | Oil & Gas Operator | May 2002 |
| 53 | Burlington Resources Oil&Gas Co. | Houston, TX 77056 | Oil & Gas Operator | Jan 2020 |
| 54 | Bustamante Resources LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 55 | Byler Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 56 | C Oil Co. | | Oil & Gas Operator | Feb 2017 |
| 57 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jun 2020 |
| 58 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 59 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 60 | Celero Energy, L.P. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |
| 61 | Cex Operating Company | Dallas, TX 75206-5034 | Oil & Gas Operator | Mar 2008 |
| 62 | Chance Properties Co. | Kermit, TX 79745 | Oil & Gas Operator | Jun 2020 |
| 63 | Chaparral (USA) Energy, Inc. | | Oil & Gas Operator | Sep 2002 |
| 64 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2020 |
| 65 | Chapman, Ford Operating, Inc. | | Oil & Gas Operator | Jan 1996 |
| 66 | Chase Avenue Corporation, The | | Oil & Gas Operator | Jun 2003 |
| 67 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154-496 | Oil & Gas Operator | Jan 2020 |
| 68 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Jun 2020 |
| 69 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2020 |
| 70 | Cholla Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2020 |
| 71 | Cimarex Energy Co. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2020 |
| 72 | Cimarex Energy Co. Of Colorado | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2020 |
| 73 | Citation Oil & Gas Corp. | Houston, TX 77269-688 | Oil & Gas Operator | Dec 2020 |
| 74 | Claude-Maggie Co. | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 75 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 76 | CM TX Production, LLC | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2020 |
| 77 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jun 2020 |
| 78 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 79 | Coastal Oil & Gas Corp | Houston, TX 77252-2511 | Oil & Gas Operator | Oct 2015 |
| 80 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2020 |
| 81 | COG Production LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2020 |
| 82 | Concho Oil & Gas Corp. | | Oil & Gas Operator | May 2003 |
| 83 | Concho Resources Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2004 |
| 84 | Concorde Exploration, Inc. | | Oil & Gas Operator | Oct 1994 |
| 85 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2020 |
| 86 | Conoco Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2015 |
| 87 | ConocoPhillips Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2020 |
| 88 | Cook, Kenneth D. Operator | Midland, TX 79701-3963 | Oil Operator | Jun 2020 |
| 89 | Corlena Oil Company | Amarillo, TX 79101-2345 | Oil & Gas Operator | Jun 2020 |
| 90 | Costa Resources, Inc. | | Oil & Gas Operator | Aug 2003 |
| 91 | Costilla Energy, Inc. | Gillette, WY 82717 | Oil & Gas Operator | Mar 2008 |
| 92 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 93 | Cox, Martin Regan | Irving, TX 75014-994 | Oil & Gas Operator | Jun 2020 |
| 94 | Creager And Creager Production | | Oil & Gas Operator | Aug 2003 |
| 95 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 96 | Cuatro Oil And Gas Corporation | | Oil & Gas Operator | Jun 2020 |
| 97 | Cxy Energy, Inc. | Dallas, TX 75284 | Oil & Gas Operator | Sep 2014 |
| 98 | Dakota Resources, Inc. (I) | Midland, TX 79705 | Oil & Gas Operator | Jun 2020 |
| 99 | Daniel Oil & Gas | | Oil & Gas Operator | Oct 2010 |
| 100 | Daylight Petroleum LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2020 |