| 12301 | H. B. McCullough | | Oil Operator | Oct 2004 |
| 12302 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 12303 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Mar 2026 |
| 12304 | H. D. Investments | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 12305 | H. D. McCormick | | Oil & Gas Operator | Jun 2016 |
| 12306 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 12307 | H. G. Oil Operator | | Oil Operator | Mar 2001 |
| 12308 | H. H. Blair Oil Company, Inc. | Atlanta, KS 67008 | Oil Operator | Dec 2009 |
| 12309 | H. I. M. Producers | Graham, TX 76450 | Oil & Gas Operator | May 1999 |
| 12310 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 12311 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 12312 | H. K. Beebe | | Oil Operator | Jan 1990 |
| 12313 | H. L. Hunt | | Oil & Gas Operator | Jun 1980 |
| 12314 | H. L. McKee & J. P. McKee Jr. | | Gas Operator | Mar 2023 |
| 12315 | H. L. Richey | | Oil & Gas Operator | Sep 1995 |
| 12316 | H. O. Strickler Operator | | Oil & Gas Operator | Dec 1993 |
| 12317 | H. Olsen & Sons Contractors, Inc. | Forestville, NY 14062 | Gas Operator | Dec 2024 |
| 12318 | H. Proler-Luffey Gas Corp. | | Gas Operator | Apr 1979 |
| 12319 | H. T. Hilliard & Co. | | Oil & Gas Operator | Dec 1999 |
| 12320 | H. W. Reynolds Jr. | | Gas Operator | Dec 1984 |
| 12321 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 12322 | H.D. Smith, Inc. | Waller, TX 77484 | Oil Operator | Mar 2026 |
| 12323 | H.E. Sutton, Et Al | | Oil & Gas Operator | Jan 1990 |
| 12324 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | Mar 2026 |
| 12325 | H.E.X.T. Operating, LTD. | Buna, TX 77612 | Oil Operator | Mar 2024 |
| 12326 | H.I.T. Resources, Inc. | Arkansas City, KS 67005 | Oil Operator | Jan 2007 |
| 12327 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | Mar 2026 |
| 12328 | H.L. Clark Oil Company LLC | Whitesboro, TX 76273 | Oil Operator | Mar 2026 |
| 12329 | H.L. Hall & Sons LLC | | Oil & Gas Operator | Dec 2011 |
| 12330 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 12331 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 12332 | H.P. Slagel Producing Co., LLC | San Angelo, TX 76902 | Oil Operator | Mar 2026 |
| 12333 | H.T. Olsen Oil & Gas Operations | | Oil & Gas Operator | Dec 2025 |
| 12334 | H2oil Services LLC | | Oil Operator | Dec 2025 |
| 12335 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Jan 2026 |
| 12336 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Jan 2026 |
| 12337 | H3 Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 12338 | H3 Operating, LLC | Springtown, TX 76082 | Oil & Gas Operator | May 2020 |
| 12339 | Ha Goal Inc | Indiana, PA 15701-2664 | Oil & Gas Operator | Dec 2018 |
| 12340 | Ha.P.C. Oil, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Aug 2006 |
| 12341 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Jul 2025 |
| 12342 | Haas John L | | Oil Operator | Dec 2009 |
| 12343 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Sep 2025 |
| 12344 | Haas, C. F. Oil & Gas Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Mar 2026 |
| 12345 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 12346 | Haass Ranch Oil Company, LLC | Castroville, TX 78009 | Oil Operator | Mar 2026 |
| 12347 | Habanero Oil & Gas Operating,LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2018 |
| 12348 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 12349 | Habetz Oilfield Saltwater Ser, Inc | | Oil Operator | Dec 2024 |
| 12350 | Habit Petroleum | | Oil Operator | Dec 2009 |
| 12351 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 12352 | Hackberry Production, Inc. | | Oil Operator | Mar 1988 |
| 12353 | Hacker Brothers Oil Company, Inc | Muenster, TX 76252 | Oil & Gas Operator | May 2004 |
| 12354 | Hacker Brothers Well Service,Inc | Muenster, TX 76252 | Oil & Gas Operator | Mar 2026 |
| 12355 | Hacker, Freddie J. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2012 |
| 12356 | Hacker, Jack | Coats, KS 67028 | Oil & Gas Operator | Jul 2025 |
| 12357 | Hackley Okla Inc | | Oil & Gas Operator | Aug 1992 |
| 12358 | Had-A-Call Oil | | Oil Operator | Feb 2017 |
| 12359 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Mar 2026 |
| 12360 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 12361 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 12362 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 12363 | Haddad & Brooks Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2018 |
| 12364 | Haddad Boynton, LLC | Jonesville, TX 75659 | Oil Operator | Mar 2026 |
| 12365 | Hadden, Pennell & Rohret | Lakewood, CO 80228 | Oil Operator | Nov 1994 |
| 12366 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 12367 | Haddox Johnny C | Okemah, OK 74859-0254 | Oil Operator | Apr 2020 |
| 12368 | Haddox Petroleum Corp | | Gas Operator | Dec 2010 |
| 12369 | Hadley Oil | Nocona, TX 76255 | Oil Operator | Jan 2014 |
| 12370 | Hadley Oil Company, LLC | Nocona, TX 76255 | Oil Operator | Mar 2026 |
| 12371 | Hadley/Jackson Energy LLC | Lake Forest, IL 60045 | Oil & Gas Operator | Jan 2026 |
| 12372 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 12373 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 12374 | Hadson Petroleum | | Oil Operator | Sep 1988 |
| 12375 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 12376 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 12377 | Haessly Hardwood Lumber Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 12378 | Hafer Run Enterprise | Independence, KS 67301 | Oil Operator | Oct 1997 |
| 12379 | Haffaday Oil LLC | | Oil Operator | Jan 2025 |
| 12380 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Sep 2025 |
| 12381 | Hagan, IVan - All-Kin Oil Co | | Oil Operator | Dec 2024 |
| 12382 | Hager Gas Co | Danville, WV 25053 | Gas Operator | Dec 2010 |
| 12383 | Haggard Operating Group/Oil | Atascosa, TX 78002 | Oil & Gas Operator | Mar 2026 |
| 12384 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 12385 | Hagler William N | Farmington, NM 87499-0035 | Oil Operator | Apr 2014 |
| 12386 | Hahn Kahle E | Knox, PA 16232-4311 | Oil & Gas Operator | Dec 2003 |
| 12387 | Haider Operating, LLC | Pampa, TX 79066 | Oil & Gas Operator | Mar 2026 |
| 12388 | Haigood & Campbell | Archer City, TX 76351 | Oil & Gas Operator | Mar 2026 |
| 12389 | Haigood, Danny | Portland, TX 78374 | Oil & Gas Operator | Mar 2008 |
| 12390 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 12391 | Haile Petroleum LTD | Artesia, NM 882110186 | Oil & Gas Operator | Aug 2000 |
| 12392 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Sep 2025 |
| 12393 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 12394 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 12395 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 12396 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Mar 2026 |
| 12397 | Haischer James W Dba Haischer James W And Assoc | | Oil & Gas Operator | Dec 2001 |
| 12398 | Hal J Rasmussen Oper Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2014 |
| 12399 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 12400 | Haland Operating Company, LLC | | Oil & Gas Operator | Jul 2018 |