| 101 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 102 | Hawkins Oil, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2025 |
| 103 | Hawkins, James F. | Tulsa, OK 74103 | Oil Operator | Dec 2019 |
| 104 | Hawley John B Jr | | Gas Operator | Dec 1983 |
| 105 | Hawn Petroleum I | | Oil Operator | Jun 1989 |
| 106 | Hayden Operating | | Oil & Gas Operator | Sep 2025 |
| 107 | Hayes Oil & Gas LLC | Attica, KS 67009 | Oil & Gas Operator | Sep 2025 |
| 108 | Hayes Well Servi | | Oil & Gas Operator | Feb 1992 |
| 109 | Haynie Robert L | | Gas Operator | Jan 2004 |
| 110 | Hays Oil Field S | | Oil Operator | Nov 1988 |
| 111 | Hazen, Paul D. | Great Bend, KS 67530 | Oil Operator | Nov 1990 |
| 112 | Hazen, Ty Anthony | Lyons, KS 67554 | Oil Operator | Sep 2025 |
| 113 | HB Energy LLC | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 114 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 115 | HD Well Services LLC | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 116 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Jul 2025 |
| 117 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 118 | Heady, Harold | Parsons, KS 67357 | Gas Operator | Aug 2016 |
| 119 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 120 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 121 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 122 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 123 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 124 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 125 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 126 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 127 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 128 | Helbing & Robert | | Oil & Gas Operator | Feb 1991 |
| 129 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 130 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 131 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 132 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Nov 2025 |
| 133 | Helm Energy Company | Tulsa, OK 74133 | Oil Operator | Sep 2025 |
| 134 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 135 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2025 |
| 136 | Helsel, Allan J | South Haven, KS 67140 | Oil Operator | Aug 2025 |
| 137 | Hembree Oil Production, LLC | Great Bend, KS 67530 | Oil Operator | Sep 2025 |
| 138 | Hembree Robert F | | Oil Operator | Dec 2009 |
| 139 | Henderson, Chris | Pawhuska, OK 74056 | Oil Operator | Dec 2009 |
| 140 | Henke, Elden H. | Lost Springs, KS 66859 | Oil & Gas Operator | Feb 1996 |
| 141 | Hennessy Oil Com | | Oil Operator | Mar 1991 |
| 142 | Hensley Oil Company LLC | Arkansas City, KS 67005 | Oil Operator | Sep 2025 |
| 143 | Hensley, Cloide J. & Hazel M. | Arkansas City, KS 67005 | Oil Operator | Sep 2001 |
| 144 | Heritage Oil L.L.C. | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 145 | Herman Krug - Oil Operations | | Oil Operator | Sep 2025 |
| 146 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Sep 2025 |
| 147 | Herman Lang Oil And Gas Co. | | Oil & Gas Operator | Dec 1992 |
| 148 | Hermreck Oil Com | | Oil & Gas Operator | Aug 1996 |
| 149 | Hermreck Oil Company | | Oil Operator | Nov 2024 |
| 150 | Herndon Drilling | | Oil & Gas Operator | May 1988 |
| 151 | Hertel Oil Company | | Oil Operator | Nov 2018 |
| 152 | Hertel Oil Company LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 153 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Sep 2025 |
| 154 | Hesse Petroleum Co.,L.L.C. | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 155 | Hessert Edward C | | Oil & Gas Operator | Sep 1993 |
| 156 | Hessert Loc Inc | Carl Junction, MO 64834 | Oil Operator | Dec 2009 |
| 157 | Hett Oil & Gas, LLC | Lincolnville, KS 66858 | Oil & Gas Operator | Sep 2025 |
| 158 | Hewitt Energy Group Inc | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 159 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 160 | Hi-Kat Petroleum | | Oil Operator | Mar 1990 |
| 161 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 162 | Hibernian Compan | | Oil & Gas Operator | Feb 1991 |
| 163 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Dec 2024 |
| 164 | Hiebert & Wedel | | Oil & Gas Operator | May 1995 |
| 165 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 166 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Sep 2025 |
| 167 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 168 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 169 | High Plains Oil | | Oil Operator | Jun 1989 |
| 170 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 171 | High Point Produ | | Gas Operator | May 1996 |
| 172 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 173 | Hillary Oil Comp | | Oil & Gas Operator | Apr 1991 |
| 174 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 175 | Hillenburg Oil Co., A General Partnership | Broken Arrow, OK 74011 | Oil Operator | Sep 2025 |
| 176 | Hilliker Oil Com | | Oil Operator | Jul 1984 |
| 177 | Hilliker Production | Indian Wells, CA 92210 | Oil & Gas Operator | Jul 2007 |
| 178 | Hilltop Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Jan 2000 |
| 179 | Himco Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Nov 2025 |
| 180 | Hinkle Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 181 | Hinkle Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Jan 1999 |
| 182 | Hinks Petroleum Co., Inc. | Wichita, KS 67201 | Oil Operator | May 1999 |
| 183 | Hirt Farms Incor | | Oil & Gas Operator | Apr 1994 |
| 184 | Hizey Service & | | Oil Operator | Apr 1994 |
| 185 | HJ, Inc. | Garden City, KS 67846 | Oil & Gas Operator | Sep 2025 |
| 186 | HKW Oil Company, Inc. | Bunker Hill, KS 67626 | Oil Operator | Dec 2009 |
| 187 | HMN Partnership | Argonia, KS 67004 | Oil Operator | Nov 1993 |
| 188 | Hodges & Hodges Oil Venture | Gallup, NM 87301 | Oil Operator | May 1999 |
| 189 | Hodges Oil | | Oil Operator | Sep 2025 |
| 190 | Hodges, Dennis D. And Peggy D. | Reading, KS 66868 | Oil Operator | Sep 2025 |
| 191 | Hoehn Oil | Wellsville, KS 66092 | Oil Operator | Oct 1998 |
| 192 | Hoehn Oil LLC | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 193 | Hoener Ross Inco | | Oil Operator | Dec 1991 |
| 194 | Hoener, Ross | Iuka, KS 67066 | Oil & Gas Operator | Jul 2025 |
| 195 | Hoepker, Larry | Humboldt, KS 66748 | Oil Operator | Dec 2024 |
| 196 | Hoff Oil & Gas | | Oil Operator | May 2013 |
| 197 | Hoffman Oil, Inc. | Claflin, KS 67525 | Oil Operator | Sep 2025 |
| 198 | Hoffman Petroleu | | Oil Operator | Sep 1989 |
| 199 | Hoffman Petroleum, Inc. | Littleton, CO 80120 | Oil Operator | Sep 1996 |
| 200 | Hoffman Resources LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |