| 1 | 21ST Century Oil Operations | Gorham, KS 67647 | Oil Operator | Dec 2001 |
| 2 | 3 B Energy, Inc. | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2012 |
| 3 | 3 G Oil Co. | | Oil Operator | Dec 2020 |
| 4 | 3-D Oil Company, A General Partnership | Dewey, OK 74029 | Oil Operator | Nov 2017 |
| 5 | 3-T Oil | | Oil Operator | Dec 1996 |
| 6 | 3G Production, LLC | Pratt, KS 67124 | Oil & Gas Operator | Dec 2020 |
| 7 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2020 |
| 8 | 4-D Petroleum Consultants,LLC | Preston, KS 67583 | Oil & Gas Operator | Feb 2013 |
| 9 | 4-M Oil | | Oil Operator | Dec 2020 |
| 10 | 4D'S Enterprises, LLC | Rantoul, KS 66079 | Oil Operator | Sep 2018 |
| 11 | 5 K Oil LLC | Toronto, KS 66777 | Oil Operator | Nov 2020 |
| 12 | 6G Twister, Inc. | Gillette, WY 82717 | Oil Operator | Jul 2012 |
| 13 | A & A Discovery, Inc | Hill City, KS 67642 | Oil Operator | Aug 2002 |
| 14 | A & A Discovery, LLC | Hill City, KS 67642 | Oil Operator | May 2018 |
| 15 | A & A Production | | Oil Operator | Feb 2013 |
| 16 | A & A Well Service | Kincaid, KS 66039 | Oil Operator | Dec 2020 |
| 17 | A & G Oil Company | Chanute, KS 66720 | Oil Operator | Sep 1999 |
| 18 | A & J Oil Compan | | Oil & Gas Operator | Dec 1994 |
| 19 | A & L Energy Operations LLC | New York, NY 10022 | Oil Operator | Sep 2013 |
| 20 | A P S, Inc. | Hays, KS 67601 | Oil Operator | Jul 2020 |
| 21 | A P X Corporatio | | Oil & Gas Operator | Nov 1992 |
| 22 | A R & R Limited | | Oil & Gas Operator | Jul 1993 |
| 23 | A X & P Incorpor | | Oil Operator | Sep 1996 |
| 24 | A X & P, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jul 2015 |
| 25 | A-1 Well Service | | Oil & Gas Operator | Jun 2019 |
| 26 | A. Francis Vonfeldt Co. | | Oil Operator | Nov 2019 |
| 27 | A. R. & R., LTD. | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2020 |
| 28 | A. Scott Ritchie | | Oil Operator | Mar 1985 |
| 29 | Aaron Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2020 |
| 30 | Aas Oil Co., Inc. | Arkansas City, KS 67005 | Oil & Gas Operator | Dec 2020 |
| 31 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2019 |
| 32 | Abderhalden, R. R. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2020 |
| 33 | Abercrombie A L | | Oil & Gas Operator | Nov 1995 |
| 34 | Abercrombie A L Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2020 |
| 35 | Abercrombie Dril | | Oil Operator | Jan 1990 |
| 36 | Abercrombie Drilling, Inc. | Wichita, KS 67202 | Oil Operator | May 1997 |
| 37 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Dec 2020 |
| 38 | Abraxas Petroleu | | Oil Operator | May 1986 |
| 39 | Abraxas Petroleum Corporation | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2021 |
| 40 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Mar 1996 |
| 41 | Abs Oil, Inc. | Piqua, KS 66761 | Oil Operator | Dec 2020 |
| 42 | Abundant Oil Company, A General Partnership | Elwood, NE 68937 | Oil Operator | Dec 2020 |
| 43 | Ace Energy LLC | Leawood, KS 66211 | Oil & Gas Operator | Dec 2020 |
| 44 | Ace Oil Company | | Oil Operator | Dec 2020 |
| 45 | Acl Production, LLC | Independence, KS 67301 | Oil Operator | Sep 2017 |
| 46 | Adair E H Oil Co | | Oil & Gas Operator | Aug 1994 |
| 47 | Adam'S Gas Corporation, Inc. | Albert, KS 67511 | Gas Operator | Mar 2004 |
| 48 | Adams Affiliates, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2021 |
| 49 | Adams G C Oil & | | Oil & Gas Operator | Nov 1996 |
| 50 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Jan 2018 |
| 51 | Adamson, Michael A. | Sapulpa, OK 74066 | Oil Operator | Oct 2015 |
| 52 | Addis Family Tru | | Oil Operator | Apr 1992 |
| 53 | Addis, Icer Estate Of | Wichita, KS 67208 | Gas Operator | Jun 2015 |
| 54 | Adeco, Inc. | Hays, KS 67601 | Oil Operator | Dec 2020 |
| 55 | Adkins Production Co. | | Oil Operator | Aug 2015 |
| 56 | Adm Industrial O | | Oil Operator | Nov 1989 |
| 57 | Admiral Bay (USA) Inc. | Centennial, CO 80112 | Gas Operator | Jun 2011 |
| 58 | Adr Operating, Inc. | Independence, KS 67301 | Oil & Gas Operator | Sep 2013 |
| 59 | Advantage Resour | | Oil & Gas Operator | May 1994 |
| 60 | Advantage Resources Inc | Broomfield, CO 80020 | Oil & Gas Operator | Dec 2020 |
| 61 | Aegean Petroleum | | Oil Operator | Mar 1982 |
| 62 | Aesir Energy | | Oil Operator | Oct 2007 |
| 63 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 64 | Afg Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 65 | Agape Service Incorporated | Denver, CO 80201 | Gas Operator | Dec 2020 |
| 66 | Agricultural Energy Services | Edmond, OK 73003 | Oil & Gas Operator | Dec 2020 |
| 67 | Agv Corp. | Attica, KS 67009 | Oil & Gas Operator | Dec 2020 |
| 68 | Ainsworth Operat | | Oil Operator | Apr 1995 |
| 69 | Ainsworth Operating Co. | Salem, OR 97302 | Oil Operator | Dec 2020 |
| 70 | Aj Oil, Inc. | Springfield, LA 70462 | Oil Operator | Nov 2020 |
| 71 | Ajax Oil & Gas C | | Oil & Gas Operator | Jun 1989 |
| 72 | Akandas, Inc. | Chanute, KS 66720 | Oil Operator | Aug 2002 |
| 73 | Al-La-Lyn Oil, Inc. | Ellis, KS 67637 | Oil Operator | Nov 2003 |
| 74 | Aladdin Petroleu | | Oil & Gas Operator | Nov 1995 |
| 75 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2020 |
| 76 | Alb, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2020 |
| 77 | Albert R. Braun Oil Operations, LLC (Estate) | Hays, KS 67601 | Oil Operator | Dec 2020 |
| 78 | Albert Thornbrough Trust | Boca Raton, FL 33432 | Gas Operator | Dec 2020 |
| 79 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Apr 2021 |
| 80 | Aleo Oil Company | | Oil Operator | Dec 2020 |
| 81 | Alexander Production Service | | Oil & Gas Operator | Dec 2009 |
| 82 | Alexander, Gary M. | Peru, KS 67360 | Oil Operator | Jul 2020 |
| 83 | Alexander, Howard | Tulsa, OK 74114 | Oil Operator | Jun 1988 |
| 84 | Alexander, Jesse R. | McPherson, KS 67460 | Oil Operator | Aug 2010 |
| 85 | Allam Carl Oil C | | Oil Operator | Mar 1986 |
| 86 | Allam Kevin T Oi | | Oil Operator | Jun 1988 |
| 87 | Allam Production, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | Dec 2020 |
| 88 | Allam WM Robt Jr | | Oil Operator | Aug 1993 |
| 89 | Allen Drilling C | | Oil & Gas Operator | Nov 1994 |
| 90 | Allen Drilling Company | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2009 |
| 91 | Allen J D & Comp | | Oil Operator | Jan 1983 |
| 92 | Allenergy, Inc. | Grove, OK 74345 | Oil & Gas Operator | Jul 2012 |
| 93 | Alliance Exploration Co., LLC | Tulsa, OK 74119 | Oil Operator | Apr 2017 |
| 94 | Allied Oil Compa | | Oil & Gas Operator | Feb 1995 |
| 95 | Allied Oil Company, Inc. | Taneyville, MO 65759 | Oil Operator | Apr 1996 |
| 96 | Allison Dean Oil | | Oil & Gas Operator | Nov 1994 |
| 97 | Allison J A | | Oil & Gas Operator | Nov 1995 |
| 98 | Allison Oil Comp | | Oil Operator | Dec 1986 |
| 99 | Allison Operating Co., L.C. | Wichita, KS 67202 | Oil & Gas Operator | Dec 1998 |
| 100 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |