| 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 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2019 |
| 5 | Abraxas Petroleum Corporation | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2020 |
| 6 | Adventure Exploration PTRS, LLC | | Oil & Gas Operator | Aug 2012 |
| 7 | Adventure Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 8 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 9 | Aikman Oil Corp. | Oklahoma City, OK 73157-2922 | Oil & Gas Operator | Jun 2020 |
| 10 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 11 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Jun 2020 |
| 12 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 13 | Alpine Resources, Inc. | | Oil & Gas Operator | Mar 2008 |
| 14 | Alta Energy Corporation | Oklahoma City, OK 731028260 | Oil & Gas Operator | Apr 1995 |
| 15 | Altura Energy LTD. | Atlanta, GA 30384 | Oil & Gas Operator | Apr 2000 |
| 16 | Amax Oil & Gas Inc. | Houston, TX BAD ADDR | Oil & Gas Operator | Mar 2009 |
| 17 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 18 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Feb 2016 |
| 19 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 20 | American Exploration Company | Houston, TX 77010-3088 | Oil & Gas Operator | Jan 2000 |
| 21 | Amoco Production Co. | Chicago, IL 60601-7125 | Oil & Gas Operator | Jun 2015 |
| 22 | Anadarko E&P Company LP | Houston, TX 77251-1330 | Oil & Gas Operator | Oct 2014 |
| 23 | Anadarko Petroleum Corporation | Houston, TX 77251-1330 | Oil & Gas Operator | Feb 2020 |
| 24 | Anegada Resources | | Oil & Gas Operator | Jan 2002 |
| 25 | Angle Oil Company | Hays, KS 67601 | Oil Operator | Sep 2002 |
| 26 | Anthony, Bob G. Inc. | Brookhaven, MS 39601 | Oil & Gas Operator | Jun 2020 |
| 27 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Jun 2020 |
| 28 | Apache Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 29 | Arch Oil & Gas, LLC | Dallas, TX 75248-2609 | Oil & Gas Operator | Jun 2020 |
| 30 | Arch Petroleum Inc. | Midland, TX 797027340 | Oil & Gas Operator | Mar 2008 |
| 31 | Arco Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 32 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 33 | Area Pipe And Equipment | | Oil & Gas Operator | Apr 2003 |
| 34 | Arkland Producing Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2020 |
| 35 | Arkland, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 1994 |
| 36 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 37 | Associated Operating & Explor. | | Oil & Gas Operator | Jun 2020 |
| 38 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 39 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 40 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2020 |
| 41 | B.P. Oil Company | | Oil & Gas Operator | Jun 2020 |
| 42 | Banam Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2013 |
| 43 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Jun 2020 |
| 44 | Baron Energy Inc. | San Marcos, TX 78666 | Oil & Gas Operator | Jun 2020 |
| 45 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Jun 2020 |
| 46 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Jun 2020 |
| 47 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Jun 2020 |
| 48 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2012 |
| 49 | Baylor Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2020 |
| 50 | Baytech, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 51 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 52 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2020 |
| 53 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2004 |
| 54 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 55 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Jun 2020 |
| 56 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 57 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 58 | Big Lake J J Oil & Gas, Inc. | | Oil & Gas Operator | Jun 2020 |
| 59 | Big Star Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2017 |
| 60 | Bills, L. T. | Snyder, TX 79549 | Oil & Gas Operator | Jun 2020 |
| 61 | Bird E&P LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 62 | Bird, Charles A. | | Oil & Gas Operator | Feb 2012 |
| 63 | Bishop, D. L. | | Oil & Gas Operator | Mar 2012 |
| 64 | Black Resources, Inc. | Granbury, TX BAD ADDR | Oil & Gas Operator | Mar 2008 |
| 65 | Blanco Oil Company | | Oil & Gas Operator | Aug 2010 |
| 66 | Bledsoe Partners, Inc. | | Oil & Gas Operator | Mar 1995 |
| 67 | Bluestem Energy Holdings, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 68 | Boaz Energy II Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2020 |
| 69 | Bodark Oil Company | | Oil & Gas Operator | Jul 2009 |
| 70 | Bold Operating, LLC | The Woodlands, TX 77381-1197 | Oil & Gas Operator | May 2019 |
| 71 | Bomar Operating Co., LC | | Oil & Gas Operator | Jun 2020 |
| 72 | BP America Production Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2020 |
| 73 | Braden-Deem Inc | Scottsdale, AZ 85255 | Oil & Gas Operator | Mar 2020 |
| 74 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2020 |
| 75 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2020 |
| 76 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2020 |
| 77 | Bright & Co. | Dallas, TX 752066534 | Oil & Gas Operator | May 2015 |
| 78 | Bristol Resources Corp. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2000 |
| 79 | Broad Oak Energy, Inc. | | Oil & Gas Operator | Jul 2011 |
| 80 | Broman Oil & Gas LP | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2017 |
| 81 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Jun 2020 |
| 82 | Brotherton Production Co. | Midland, TX 79705 | Oil & Gas Operator | Jun 2020 |
| 83 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2020 |
| 84 | Brower, Robert C. | Fort Worth, TX 76136-1225 | Oil & Gas Operator | Jun 2020 |
| 85 | Brown, H. L., Jr. | | Oil & Gas Operator | Jul 2001 |
| 86 | Brown, H.L. Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 87 | Brown, Tom Inc. | Denver, CO 80202-3918 | Oil & Gas Operator | Aug 2019 |
| 88 | BRP Energy, LLC | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2020 |
| 89 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 90 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 91 | Burleson Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 92 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 93 | Bustamante Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jun 2020 |
| 94 | Byrd Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 95 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jun 2020 |
| 96 | Cambrian Management LTD | Midland, TX 79702 | Oil & Gas Operator | Jun 2020 |
| 97 | Caprock Exploration, Inc. | Odessa, TX 79760-7288 | Oil & Gas Operator | Jun 2020 |
| 98 | Caprock Operating, Inc. | | Oil & Gas Operator | Dec 2007 |
| 99 | Cass Energy Corp | | Oil & Gas Operator | Aug 2003 |
| 100 | Celero Energy, L.P. | Midland, TX 79701 | Oil & Gas Operator | Sep 2005 |