| 13101 | Heartland Energy Company | Big Horn, WY 82833 | Gas Operator | Jun 2012 |
| 13102 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 13103 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 13104 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 13105 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 13106 | Heartland Oil & Gas Company | | Oil & Gas Operator | Jun 2000 |
| 13107 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 13108 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | Apr 2025 |
| 13109 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Jan 2025 |
| 13110 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 13111 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 13112 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 13113 | Heat Controller Inc | Jackson, MI 49204 | Oil & Gas Operator | Dec 1996 |
| 13114 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 13115 | Heath 91 Cluster LP | Commodore, PA 15729-9109 | Gas Operator | Dec 2020 |
| 13116 | Heath B M | | Oil & Gas Operator | Feb 1994 |
| 13117 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 13118 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Jan 2025 |
| 13119 | Heath, Chad | Greensburg, KY 42743 | Oil Operator | Dec 2023 |
| 13120 | Heath, Francis A. & Ruth E. | South Dayton, NY 14138 | Gas Operator | Dec 2023 |
| 13121 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 13122 | Heather & Randy Iantorno Oil | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 13123 | Heatherly, Darl H. | Belington, WV 26250 | Gas Operator | Dec 2021 |
| 13124 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 13125 | Hebert & Rucks L.L.C. | | Oil & Gas Operator | May 2002 |
| 13126 | Hebron Energy, LLC | Dallas, TX 75206 | Oil Operator | Jul 2018 |
| 13127 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 13128 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 13129 | Hedrick Production Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2025 |
| 13130 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 13131 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 13132 | Hegco Canada Inc | | Oil & Gas Operator | Nov 2003 |
| 13133 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 13134 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 13135 | Hehns Quality Gardens Inc | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 2023 |
| 13136 | Heifer Production Company LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 13137 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Apr 2025 |
| 13138 | Heim, William J. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 13139 | Heineman, Ronald F. | Caledonia, NY 14423 | Gas Operator | Dec 2023 |
| 13140 | Heinrich Enterprises Inc Dba Washington Operations | Reno, OH 45773 | Oil & Gas Operator | Dec 2024 |
| 13141 | Heinrich Enterprises, Inc. | Reno, OH 45773-0305 | Oil & Gas Operator | Dec 2021 |
| 13142 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 13143 | Heintz Gas & Oil Company, Inc. | Allegany, NY 14706 | Gas Operator | Dec 2023 |
| 13144 | Heisey Ventures, Inc. | Houston, TX 77019 | Oil & Gas Operator | Apr 2025 |
| 13145 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 13146 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 13147 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 13148 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 13149 | Helemrich & Payne Inc | Iraan, TX 79744 | Oil & Gas Operator | Sep 2002 |
| 13150 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 13151 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Feb 2025 |
| 13152 | Helena Resources LLC | Helena, OK 73741-4120 | Oil & Gas Operator | Jan 2025 |
| 13153 | Helios Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 13154 | Helis Oil & Gas Company LLC Estate | New Orleans, LA 70130 | Oil & Gas Operator | Jul 2022 |
| 13155 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 13156 | Helis, William G. Co., LLC, The | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2003 |
| 13157 | Helis,WM.G.,Est., A Partnership | New Orleans, LA 70130 | Oil & Gas Operator | Aug 2003 |
| 13158 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 13159 | Hell Creek Crude LLC | Winnett, MT 59087 | Oil Operator | Feb 2025 |
| 13160 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 13161 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 13162 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Jan 2025 |
| 13163 | Heller, Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Jan 2025 |
| 13164 | Hellifino Operating, LLC | San Antonio, TX 78212 | Oil Operator | Apr 2025 |
| 13165 | Hellman Properties LLC | | Oil & Gas Operator | Dec 2024 |
| 13166 | Hellums, Harold | Cedar Creek, TX 78612 | Oil & Gas Operator | Mar 2008 |
| 13167 | Helm Energy Company | Tulsa, OK 74133 | Oil Operator | Dec 2024 |
| 13168 | Helmcamp, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2002 |
| 13169 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 13170 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 13171 | Helmer Bonnie Jean Revocable Trust | Pawhuska, OK 74056 | Oil Operator | Jan 2025 |
| 13172 | Helmer Energy & Stanton Engr. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1998 |
| 13173 | Helmer Oil Corporation | Pawhuska, OK 74056 | Oil & Gas Operator | Jan 2025 |
| 13174 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 13175 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2025 |
| 13176 | Helmhold Oil Incorporated | Wellsville, NY 14895 | Oil Operator | Dec 2019 |
| 13177 | Helms Oil | Brinkhaven, OH 43006 | Oil Operator | Dec 2018 |
| 13178 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 13179 | Helo Energy, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2001 |
| 13180 | Helsel, Allan J | South Haven, KS 67140 | Oil Operator | Nov 2024 |
| 13181 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 13182 | Helton Petroleum | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 13183 | Helton, Pat A. & Alberta | Allison, TX 79003 | Oil & Gas Operator | Apr 2025 |
| 13184 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 13185 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Oct 2024 |
| 13186 | Hembree Oil Production, LLC | Great Bend, KS 67530 | Oil Operator | Dec 2024 |
| 13187 | Hembree Robert F | | Oil Operator | Dec 2009 |
| 13188 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 13189 | Hemco Production, L. L. C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2016 |
| 13190 | Hemenger Daniel A | Erie, PA 16510-2035 | Gas Operator | Dec 2024 |
| 13191 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 13192 | Hemus, Inc. | Bellaire, TX 77401 | Oil & Gas Operator | Sep 1994 |
| 13193 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 13194 | Henderson Art | Pawhuska, OK 74056 | Oil & Gas Operator | May 2014 |
| 13195 | Henderson Charles E | Bokoshe, OK 74930 | Gas Operator | Oct 2021 |
| 13196 | Henderson Don Inc | Oklahoma City, OK 73134-1753 | Oil & Gas Operator | Aug 2013 |
| 13197 | Henderson Exploration Company | Tulsa, OK 74120 | Oil & Gas Operator | May 2013 |
| 13198 | Henderson Fred J | Okmulgee, OK 74447-9204 | Oil & Gas Operator | Jan 2025 |
| 13199 | Henderson Natural Res, L.L.C. | Crozet, VA 22932 | Oil & Gas Operator | Apr 2025 |
| 13200 | Henderson Oil & Gas | | Oil Operator | Sep 1990 |