| 13301 | Hertel Oil Company | | Oil Operator | Nov 2018 |
| 13302 | Hertel Oil Company LLC | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 13303 | Herv Oil, LLC | Oklahoma City, OK 73116 | Oil Operator | Jan 2025 |
| 13304 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 13305 | Hesperus Energy II LLC | | Oil Operator | Jan 2025 |
| 13306 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Feb 2025 |
| 13307 | Hess Bros. DRLG. Co. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2008 |
| 13308 | Hess Co2 Resources LLC | Seminole, TX 79360 | Gas Operator | Aug 2017 |
| 13309 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 13310 | Hess Corporation, A De Corp. | | Oil & Gas Operator | Oct 2006 |
| 13311 | Hess Ohio Developments LLC | Houston, TX 77010 | Oil & Gas Operator | Sep 2018 |
| 13312 | Hess Ohio Resources LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 13313 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Dec 2024 |
| 13314 | Hess Production | Quitaque, TX 79255 | Oil & Gas Operator | Apr 2025 |
| 13315 | Hess Seminole Assets LLC | Seminole, TX 79360 | Oil & Gas Operator | Aug 2017 |
| 13316 | Hess, Jay E. | Andover, NY 14806 | Oil & Gas Operator | Dec 2023 |
| 13317 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 13318 | Hesse Petroleum Co.,L.L.C. | Wichita, KS 67208 | Oil & Gas Operator | Dec 2024 |
| 13319 | Hessert Edward C | | Oil & Gas Operator | Sep 1993 |
| 13320 | Hessert Loc Inc | Carl Junction, MO 64834 | Oil Operator | Dec 2009 |
| 13321 | Hester Jr J C | Lawton, OK 73502-1887 | Oil & Gas Operator | Oct 1997 |
| 13322 | Hester, Harold & Betty | Bowling Green, KY 42101 | Oil Operator | Dec 2023 |
| 13323 | Heston Oil Company | Tulsa, OK 74108 | Oil & Gas Operator | Mar 2005 |
| 13324 | Hett Oil & Gas, LLC | Lincolnville, KS 66858 | Oil & Gas Operator | Dec 2024 |
| 13325 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 13326 | Hewitt Doug | Hominy, OK 74035 | Oil Operator | Jul 2024 |
| 13327 | Hewitt Energy Group, Inc. | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 13328 | Hewitt Oil, LLC | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 13329 | Hewitt, Alan P. | Midland, TX 79702 | Oil & Gas Operator | Aug 1997 |
| 13330 | Hewitt, Robert J. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2004 |
| 13331 | Hexadyne Energy Corp. | | Oil & Gas Operator | Dec 2013 |
| 13332 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 13333 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 13334 | Heydrick Petroleum Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 13335 | Hez Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 13336 | HG Energy II Appalachia, LLC | | Oil & Gas Operator | Mar 2022 |
| 13337 | HG Energy LLC | Parkersburg, WV 26101 | Oil & Gas Operator | Dec 2021 |
| 13338 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2024 |
| 13339 | HG Operating LLC | Plano, TX 75026 | Oil & Gas Operator | Apr 2025 |
| 13340 | HGB Oil Company | Denver, CO 80224 | Oil Operator | Mar 2006 |
| 13341 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 13342 | Hgi Corporation | Nada, TX 77460 | Oil & Gas Operator | Apr 2016 |
| 13343 | HGN Operating Co Inc | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 13344 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 13345 | HH&F Partners | Katy, TX 77450 | Oil & Gas Operator | Sep 2019 |
| 13346 | HHH & G Oil Co | Owasso, OK 74055 | Oil Operator | Jun 2020 |
| 13347 | HHL Development Inc | Garber, OK 73738 | Oil & Gas Operator | Jan 2025 |
| 13348 | Hi - Mountain Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 13349 | Hi Plains Hydrocarbons, Inc. | Sunray, TX 79086 | Oil & Gas Operator | Oct 2002 |
| 13350 | Hi Snyder/Snyder Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2019 |
| 13351 | Hi-Kat Petroleum | | Oil Operator | Mar 1990 |
| 13352 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 13353 | Hi-Mi Exploration, LLC | Alvaton, KY 42122 | Oil & Gas Operator | Dec 2022 |
| 13354 | Hi-Pro Production | Gillette, WY 82717 | Gas Operator | Nov 2003 |
| 13355 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 13356 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Apr 2025 |
| 13357 | Hibbard-Frost-Smith | | Oil & Gas Operator | Apr 1990 |
| 13358 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 13359 | Hibernia Resources III, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2023 |
| 13360 | Hibernia Resources IV, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 13361 | Hibernia Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2014 |
| 13362 | Hibernian Compan | | Oil & Gas Operator | Feb 1991 |
| 13363 | Hickey, Jeff | Whitesville, KY 42378 | Oil Operator | Dec 2023 |
| 13364 | Hickey, Kevin F. & Mary | Akron, NY 14001 | Gas Operator | Dec 2023 |
| 13365 | Hickman & Ickert | Olney, TX 76374 | Oil & Gas Operator | Feb 2002 |
| 13366 | Hickman Richard W | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 13367 | Hickman, Chad | Burkesville, KY 42717 | Oil Operator | Dec 2023 |
| 13368 | Hickman, Johnny | | Oil & Gas Operator | Oct 2011 |
| 13369 | Hickman-Jordan-Halligan Ranches | Blackwell, TX 79506 | Oil & Gas Operator | Feb 1998 |
| 13370 | Hickory Petroleum Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2013 |
| 13371 | Hickory-National Co. | | Oil Operator | Dec 1986 |
| 13372 | Hickox Oil Texas Company, Inc. | Mobile, AL 36689 | Oil & Gas Operator | Feb 1996 |
| 13373 | Hickox, I. N. | | Oil Operator | Nov 1967 |
| 13374 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Dec 2024 |
| 13375 | Hicks Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2012 |
| 13376 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 13377 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 13378 | Hidalgo Oil & Exploration Corp. | New Braunfels, TX 78131 | Oil & Gas Operator | Apr 2025 |
| 13379 | Hiebert & Wedel | | Oil & Gas Operator | May 1995 |
| 13380 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 13381 | Higginbotham, O. V. | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 1996 |
| 13382 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Dec 2024 |
| 13383 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 13384 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 13385 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 13386 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Apr 2025 |
| 13387 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Jan 2025 |
| 13388 | High Island Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 13389 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 13390 | High McDonald Operating Co | Norman, OK 73072-7607 | Oil Operator | Dec 2024 |
| 13391 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 13392 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Apr 2025 |
| 13393 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2025 |
| 13394 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 13395 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 13396 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Apr 2025 |
| 13397 | High Plains Oil | | Oil Operator | Jun 1989 |
| 13398 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
| 13399 | High Plains Operating, LLC | | Oil Operator | Mar 2025 |
| 13400 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |