| 1 | H & B Petroleum Corp. | Hutchinson, KS 67504 | Oil & Gas Operator | Sep 2025 |
| 2 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 3 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Sep 2025 |
| 4 | H & D Exploration LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 5 | H & H Oil Compan | | Oil & Gas Operator | Aug 1995 |
| 6 | H & H Oil Company | | Oil & Gas Operator | Sep 2025 |
| 7 | H & H Oil Company, A General Partnership | Plainville, KS 67663 | Oil Operator | Feb 1997 |
| 8 | H & H Oil, LLC | Lincolnville, KS 66858 | Oil Operator | Sep 2025 |
| 9 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 10 | H & H Production, Inc. | Topeka, KS 66614 | Oil Operator | May 1997 |
| 11 | H & H Supply Inc | | Gas Operator | Mar 1985 |
| 12 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 13 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 14 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 15 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jun 2025 |
| 16 | H & M Productions L.L.C. | Overland Park, KS 66210 | Oil Operator | May 1998 |
| 17 | H & R Expl & Production Inc | Sidney, NE 69162 | Oil Operator | May 2007 |
| 18 | H & R Exploratio | | Oil Operator | Feb 1992 |
| 19 | H & S Oil Co., LLC | Cherryvale, KS 67335 | Oil Operator | Oct 2024 |
| 20 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 21 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 22 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 23 | H-30 Incorporate | | Oil & Gas Operator | Nov 1990 |
| 24 | H-30, Inc. | Wichita, KS 67202 | Gas Operator | Oct 2006 |
| 25 | H-40 Drilling, Inc. | Medicine Lodge, KS 67104 | Gas Operator | Sep 2025 |
| 26 | H-5 Service | Plainville, KS 67663 | Oil Operator | May 1989 |
| 27 | H-D Oilfield Service, Inc. | Bazine, KS 67516 | Oil Operator | Sep 2025 |
| 28 | H. H. Blair Oil Company, Inc. | Atlanta, KS 67008 | Oil Operator | Dec 2009 |
| 29 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 30 | H.I.T. Resources, Inc. | Arkansas City, KS 67005 | Oil Operator | Jan 2007 |
| 31 | H3 Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 32 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Jul 2025 |
| 33 | Haas John L | | Oil Operator | Dec 2009 |
| 34 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Sep 2025 |
| 35 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 36 | Habit Petroleum | | Oil Operator | Dec 2009 |
| 37 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 38 | Hacker, Jack | Coats, KS 67028 | Oil & Gas Operator | Jul 2025 |
| 39 | Hackley Okla Inc | | Oil & Gas Operator | Aug 1992 |
| 40 | Had-A-Call Oil | | Oil Operator | Feb 2017 |
| 41 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Nov 2025 |
| 42 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 43 | Hadson Petroleum | | Oil Operator | Sep 1988 |
| 44 | Hafer Run Enterprise | Independence, KS 67301 | Oil Operator | Oct 1997 |
| 45 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Sep 2025 |
| 46 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Sep 2025 |
| 47 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 48 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 49 | Hall Oil Company | Humboldt, KS 66748 | Oil Operator | Nov 2009 |
| 50 | Hall Richard A | | Oil Operator | Sep 1993 |
| 51 | Hall, J.J. Operating Co., Inc. | Lakewood, CO 80215 | Oil Operator | Jan 2005 |
| 52 | Hall, Michael Wayne | Toronto, KS 66777 | Oil Operator | Dec 2009 |
| 53 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 54 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 55 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 56 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 57 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 58 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 59 | Hamilton Brother | | Gas Operator | May 1993 |
| 60 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 61 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 62 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 63 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 64 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 65 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 66 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Sep 2025 |
| 67 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 68 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 69 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 70 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 71 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 72 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Sep 2025 |
| 73 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 74 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 75 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 76 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 77 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 78 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 79 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 80 | Harold Production | Castle Rock, CO 80104 | Gas Operator | Mar 1999 |
| 81 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 82 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Sep 2025 |
| 83 | Harper Prod Comp | | Gas Operator | May 1991 |
| 84 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 85 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 86 | Harris, David | Toronto, KS 66777 | Oil Operator | Sep 2025 |
| 87 | Harrison Oil | Lindsay, OK 73052 | Oil & Gas Operator | Nov 2014 |
| 88 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 89 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 90 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | Sep 2025 |
| 91 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 92 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 93 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 94 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 95 | Hat Creek Cattle Company, A General Partnership | Paola, KS 66071 | Oil Operator | Aug 2016 |
| 96 | Haul-Pac, Inc. | Hiawatha, KS 66434 | Oil Operator | Aug 2025 |
| 97 | Haven Oil & Gas | Hutchinson, KS 67504 | Oil & Gas Operator | Mar 2009 |
| 98 | Hawkeye Oil | | Oil & Gas Operator | Jun 2007 |
| 99 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 100 | Hawkins Oil & Gas Company | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |