| 12301 | Hall-Houston Expl. II, L.P. | Houston, TX 77027 | Oil & Gas Operator | Nov 2024 |
| 12302 | Hall-Houston Expl. III, L.P. | Houston, TX 77027 | Oil & Gas Operator | Jul 2013 |
| 12303 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 12304 | Hallador Petroleum Company | | Oil & Gas Operator | Feb 1992 |
| 12305 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 12306 | Hallar Enterprises, Inc. | | Oil Operator | Oct 2007 |
| 12307 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 12308 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 12309 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 12310 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Nov 2024 |
| 12311 | Hallmark Oil And Gas Co., Inc. | | Oil & Gas Operator | Jun 2024 |
| 12312 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 12313 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 12314 | Hallwell Gas & Oil Co. | | Oil & Gas Operator | Sep 1985 |
| 12315 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 12316 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 12317 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 12318 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 12319 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 12320 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | Nov 2024 |
| 12321 | Halter Ralph P | Robertsville, OH 44670 | Oil Operator | Dec 1999 |
| 12322 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 12323 | Halvey Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 12324 | Ham Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2000 |
| 12325 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 12326 | Hamblin Ralph Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 1991 |
| 12327 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 12328 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Aug 2024 |
| 12329 | Hamill Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1999 |
| 12330 | Hamill, Claud B. Estate Of | Houston, TX 77002 | Oil & Gas Operator | Nov 1995 |
| 12331 | Hamill, Flora Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Nov 2024 |
| 12332 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 12333 | Hamilton Brother | | Gas Operator | May 1993 |
| 12334 | Hamilton Brothers | Plainview, TX 79073 | Oil & Gas Operator | Mar 2008 |
| 12335 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 12336 | Hamilton K M Oil & Gas Co | Ada, OK 74820 | Oil Operator | Jan 2013 |
| 12337 | Hamilton Leonard O | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 12338 | Hamilton, Clay | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Nov 2024 |
| 12339 | Hamilton, J. R. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Nov 2024 |
| 12340 | Hamilton, John M. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2001 |
| 12341 | Hamilton, W. B., Estate | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2004 |
| 12342 | Hamilton-Tedford Oper. Co., LLC | Wichita Falls, TX 76301 | Oil Operator | May 2007 |
| 12343 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 12344 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 12345 | Hamm, Richard | Monahans, TX 79756 | Oil & Gas Operator | Mar 1994 |
| 12346 | Hamm, Richard Inc. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2024 |
| 12347 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Nov 2024 |
| 12348 | Hamman, Blake | Graham, TX 76450 | Oil & Gas Operator | Jul 2020 |
| 12349 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 12350 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 12351 | Hammer Oil Company | Post, TX 79356 | Oil & Gas Operator | Jun 2002 |
| 12352 | Hammer Oil Properties Inc | Enid, OK 73706-0144 | Oil & Gas Operator | Oct 2017 |
| 12353 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 12354 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 12355 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 12356 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Jul 2024 |
| 12357 | Hammersmith, Beverly | West Falls, NY 14170 | Gas Operator | Dec 2023 |
| 12358 | Hammon Properties | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1996 |
| 12359 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 12360 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 12361 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 12362 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 12363 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 12364 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 12365 | Hampton Oil & Gas | Early, TX 76802 | Gas Operator | Feb 2012 |
| 12366 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 12367 | Hampton, Jno. W. & Son | Wichita Falls, TX 76302 | Oil & Gas Operator | Nov 1998 |
| 12368 | Hanaco Operating | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 12369 | Hanaco, LLC | Holliday, TX 76366 | Oil Operator | Dec 2017 |
| 12370 | Hanagan Petroleum Corp | Roswell, NM 88201 | Oil & Gas Operator | Sep 1999 |
| 12371 | Hancock Leon | Kingston, OK 73439-9618 | Oil Operator | Dec 2014 |
| 12372 | Hancock, Burton W | Morrison, CO 80465 | Oil & Gas Operator | Dec 2017 |
| 12373 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 12374 | Handy, Daniel G. | East Aurora, NY 14052 | Gas Operator | Dec 2023 |
| 12375 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 12376 | Hanger Oil, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2024 |
| 12377 | Hank Oil & Gas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2023 |
| 12378 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 12379 | Hankey Oil Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2010 |
| 12380 | Hankey Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2016 |
| 12381 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2024 |
| 12382 | Hanley & Bird Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2011 |
| 12383 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 12384 | Hanna M A Co | Cleveland, OH 44114-1824-1824 | Oil & Gas Operator | Dec 1991 |
| 12385 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Aug 2024 |
| 12386 | Hannathon Petroleum II, LLC | Midland, TX 79705 | Oil & Gas Operator | Nov 2024 |
| 12387 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Nov 2024 |
| 12388 | Hannis Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Nov 2024 |
| 12389 | Hannold, Allan & Yolanda | Bloomfield, NY 14469 | Gas Operator | Dec 2023 |
| 12390 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Aug 2024 |
| 12391 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 12392 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 12393 | Hanselman, Michael D. | Jamestown, NY 14701 | Gas Operator | Dec 2023 |
| 12394 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 12395 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 12396 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 12397 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 12398 | Hanshu Production Company | Darrouzett, TX 79024 | Oil & Gas Operator | Apr 2017 |
| 12399 | Hanshu Production Company, LLC | Nashville, TN 37215 | Gas Operator | Nov 2024 |
| 12400 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |