| 13301 | Hewitt, Robert J. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2004 |
| 13302 | Hexadyne Energy Corp. | | Oil & Gas Operator | Dec 2013 |
| 13303 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 13304 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 13305 | Heydrick Petroleum Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 13306 | Hez Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 13307 | HG Energy II Appalachia, LLC | | Oil & Gas Operator | Mar 2022 |
| 13308 | HG Energy LLC | Parkersburg, WV 26101 | Oil & Gas Operator | Dec 2021 |
| 13309 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 13310 | HG Operating LLC | Plano, TX 75026 | Oil & Gas Operator | Feb 2026 |
| 13311 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 13312 | Hgi Corporation | Nada, TX 77460 | Oil & Gas Operator | Apr 2016 |
| 13313 | HGN Operating Company, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 13314 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 13315 | HH&F Partners | Katy, TX 77450 | Oil & Gas Operator | Sep 2019 |
| 13316 | HHH & G Oil Co | Owasso, OK 74055 | Oil Operator | Jun 2020 |
| 13317 | HHL Development Inc | Garber, OK 73738 | Oil & Gas Operator | Nov 2025 |
| 13318 | Hi - Mountain Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Feb 2026 |
| 13319 | Hi Plains Hydrocarbons, Inc. | Sunray, TX 79086 | Oil & Gas Operator | Oct 2002 |
| 13320 | Hi Snyder/Snyder Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2019 |
| 13321 | Hi-Kat Petroleum | | Oil Operator | Mar 1990 |
| 13322 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 13323 | Hi-Mi Exploration, LLC | Alvaton, KY 42122 | Oil & Gas Operator | Dec 2022 |
| 13324 | Hi-Pro Production | Gillette, WY 82717 | Gas Operator | Nov 2003 |
| 13325 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 13326 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Feb 2026 |
| 13327 | Hibbard-Frost-Smith | | Oil & Gas Operator | Apr 1990 |
| 13328 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 13329 | Hibernia Resources III, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2023 |
| 13330 | Hibernia Resources IV, LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 13331 | Hibernia Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2014 |
| 13332 | Hibernian Compan | | Oil & Gas Operator | Feb 1991 |
| 13333 | Hickey, Jeff | Whitesville, KY 42378 | Oil Operator | Dec 2023 |
| 13334 | Hickey, Kevin F. & Mary | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 13335 | Hickman & Ickert | Olney, TX 76374 | Oil & Gas Operator | Feb 2002 |
| 13336 | Hickman Richard W | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 13337 | Hickman, Chad | Burkesville, KY 42717 | Oil Operator | Dec 2023 |
| 13338 | Hickman, Johnny | | Oil & Gas Operator | Oct 2011 |
| 13339 | Hickman-Jordan-Halligan Ranches | Blackwell, TX 79506 | Oil & Gas Operator | Feb 1998 |
| 13340 | Hickory Petroleum Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2013 |
| 13341 | Hickory-National Co. | | Oil Operator | Dec 1986 |
| 13342 | Hickox Oil Texas Company, Inc. | Mobile, AL 36689 | Oil & Gas Operator | Feb 1996 |
| 13343 | Hickox, I. N. | | Oil Operator | Nov 1967 |
| 13344 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Dec 2024 |
| 13345 | Hicks Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2012 |
| 13346 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 13347 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 13348 | Hidalgo Oil & Exploration Corp. | New Braunfels, TX 78131 | Oil & Gas Operator | Feb 2026 |
| 13349 | Hiebert & Wedel | | Oil & Gas Operator | May 1995 |
| 13350 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 13351 | Higginbotham, O. V. | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 1996 |
| 13352 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Sep 2025 |
| 13353 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 13354 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 13355 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 13356 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Feb 2026 |
| 13357 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Sep 2025 |
| 13358 | High Island Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 13359 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 13360 | High McDonald Operating Co | Norman, OK 73072-7607 | Oil Operator | Oct 2025 |
| 13361 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 13362 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Feb 2026 |
| 13363 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Feb 2026 |
| 13364 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 13365 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 13366 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 13367 | High Plains Oil | | Oil Operator | Jun 1989 |
| 13368 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
| 13369 | High Plains Operating, LLC | | Oil Operator | Dec 2025 |
| 13370 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |
| 13371 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 13372 | High Point Produ | | Gas Operator | May 1996 |
| 13373 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Feb 2026 |
| 13374 | High River Resources Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Nov 2025 |
| 13375 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 13376 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 13377 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 13378 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 13379 | High Splint Gas & Oil, Inc | Greenville, KY 42345 | Oil Operator | Dec 2023 |
| 13380 | High Summit Oil & Gas Inc | | Oil & Gas Operator | Sep 1987 |
| 13381 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 13382 | High-Line Production Services LLC | | Oil & Gas Operator | Sep 2025 |
| 13383 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Feb 2026 |
| 13384 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 13385 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 13386 | Highhouse James R | Warren, PA 16365-7550 | Oil & Gas Operator | Dec 2008 |
| 13387 | Highland Exploration | | Oil Operator | Sep 1979 |
| 13388 | Highland Minerals Inc | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 13389 | Highland Oil & Gas Co | Mason, OH 45040 | Oil Operator | Dec 2022 |
| 13390 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 13391 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 13392 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 13393 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 13394 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 13395 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 13396 | Highline Exploration, Inc. | Tuscaloosa, AL 35402 | Gas Operator | Nov 2020 |
| 13397 | Highman Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2024 |
| 13398 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Feb 2026 |
| 13399 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 13400 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |