| 101 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Oct 2025 |
| 102 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 103 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 104 | Harrison Oil | Lindsay, OK 73052 | Oil & Gas Operator | Nov 2014 |
| 105 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Nov 2025 |
| 106 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Nov 2025 |
| 107 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Oct 2025 |
| 108 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 109 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 110 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Oct 2025 |
| 111 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 112 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 113 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Oct 2025 |
| 114 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 115 | Hatley Delbert Jr Dba DH Enterprises | Oklahoma City, OK 73129 | Oil & Gas Operator | Nov 2025 |
| 116 | Haught Harold | Hominy, OK 74035 | Oil Operator | Feb 2012 |
| 117 | Hawkins & Hawkins | Council Hill, OK 74428 | Oil & Gas Operator | Jul 1996 |
| 118 | Hawkins & Son Inc | Boynton, OK 74422 | Oil & Gas Operator | Aug 2019 |
| 119 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 120 | Hawthorne Carl A | Mounds, OK 74047-4936 | Oil & Gas Operator | Apr 2015 |
| 121 | Haydens Oil And Gas LLC | Dover, OK 73734 | Oil & Gas Operator | Oct 2025 |
| 122 | Hayes & Hudson | Bartlesville, OK 74003 | Oil & Gas Operator | Oct 2025 |
| 123 | Haynes Jim L & Betty L | Haskell, OK 74436-8803 | Oil & Gas Operator | Dec 2013 |
| 124 | Hays Herb E & K S | Bartlesville, OK 74006 | Oil Operator | Oct 2025 |
| 125 | Hays Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2000 |
| 126 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Oct 2025 |
| 127 | Hays Stanley L | Wynola, OK 74084 | Oil Operator | May 2022 |
| 128 | Hazelwood Louis J | Albuquerque, NM 87111-6870 | Oil & Gas Operator | Feb 2023 |
| 129 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Oct 2025 |
| 130 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 131 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 132 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 133 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 134 | HCL Inc | Woodward, OK 73802-1074 | Oil Operator | Mar 2015 |
| 135 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 136 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 137 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 138 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 139 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 140 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 141 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 142 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Nov 2025 |
| 143 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 144 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 145 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 146 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Oct 2025 |
| 147 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 148 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Dec 2025 |
| 149 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 150 | Helena Resources LLC | Helena, OK 73741 | Oil & Gas Operator | Nov 2025 |
| 151 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 152 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Oct 2025 |
| 153 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Oct 2025 |
| 154 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 155 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 156 | Helmer Oil Corporation | | Oil & Gas Operator | Oct 2025 |
| 157 | Helmer, Bonnie J | | Oil Operator | Oct 2025 |
| 158 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 159 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 160 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 161 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Oct 2025 |
| 162 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 163 | Henderson Charles E | Bokoshe, OK 74930 | Gas Operator | Oct 2021 |
| 164 | Henderson Don Inc | Oklahoma City, OK 73134-1753 | Oil & Gas Operator | Aug 2013 |
| 165 | Henderson Exploration Company | Tulsa, OK 74120 | Oil & Gas Operator | May 2013 |
| 166 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2025 |
| 167 | Hendrickson Lester | Delaware, OK 74027-9715 | Oil Operator | Mar 2015 |
| 168 | Hendrickson W R | Beggs, OK 74421-2936 | Oil & Gas Operator | Jun 2023 |
| 169 | Henley, VIola F | | Oil Operator | Oct 2025 |
| 170 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 171 | Henry Billy Or Connie | Okemah, OK 74859-6075 | Oil & Gas Operator | Jul 2021 |
| 172 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Nov 2025 |
| 173 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 174 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 175 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 176 | Henry Rennick | | Oil Operator | Oct 2025 |
| 177 | Henry Wat Oil Company | Tulsa, OK 74101 | Oil Operator | Jan 2014 |
| 178 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |
| 179 | Henson Terry Dba Daycon Exploration | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2025 |
| 180 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 181 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 182 | Heritage Exploration LLC | Oklahoma City, OK 73120-5622 | Oil & Gas Operator | Jan 2020 |
| 183 | Heritage Oil Company Inc | Norman, OK 73070 | Oil & Gas Operator | Jul 2008 |
| 184 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 185 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 186 | Herrmann Arnold | Chandler, OK 74834 | Oil & Gas Operator | Sep 2024 |
| 187 | Herrmann J B Oil And Gas | Amarillo, TX 79159-0670 | Oil & Gas Operator | Feb 2015 |
| 188 | Herv Oil, LLC | Oklahoma City, OK 73116 | Oil Operator | Sep 2025 |
| 189 | Herzfeld Fabricators Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 190 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 191 | Hester Jr J C | Lawton, OK 73502-1887 | Oil & Gas Operator | Oct 1997 |
| 192 | Heston Oil Company | Tulsa, OK 74108 | Oil & Gas Operator | Mar 2005 |
| 193 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 194 | Hewitt Energy Group Inc | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 195 | Hewitt, Douglas R | | Oil Operator | May 2025 |
| 196 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2025 |
| 197 | HGN Operating Company, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 198 | HHH & G Oil Co | Owasso, OK 74055 | Oil Operator | Jun 2020 |
| 199 | HHL Development Inc | Garber, OK 73738 | Oil & Gas Operator | Nov 2025 |
| 200 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |