| 12201 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 12202 | Hall & Horning Serv Inc | Atwater, OH 44201-9375 | Oil & Gas Operator | Dec 2009 |
| 12203 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 12204 | Hall Drilling LLC (Oil & Gas) | Ellenboro, WV 26346 | Gas Operator | Sep 2014 |
| 12205 | Hall Drilling, LLC | Ellenboro, WV 26346 | Oil & Gas Operator | Dec 2021 |
| 12206 | Hall Edward L | Ada, OK 74820-3321 | Oil & Gas Operator | Dec 2025 |
| 12207 | Hall Energy Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2016 |
| 12208 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 12209 | Hall Energy Inc | Magnetic Spring, OH 43036 | Oil & Gas Operator | Dec 2017 |
| 12210 | Hall Engineering, Inc. | | Oil & Gas Operator | Jan 2007 |
| 12211 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 12212 | Hall Farm Leasing, LLC | | Oil Operator | Dec 2012 |
| 12213 | Hall IVan & Assoc Inc | Berea, OH 44017 | Oil & Gas Operator | Dec 1997 |
| 12214 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | May 2026 |
| 12215 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | May 2026 |
| 12216 | Hall Oil Company | Humboldt, KS 66748 | Oil Operator | Nov 2009 |
| 12217 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 12218 | Hall Richard A | | Oil Operator | Sep 1993 |
| 12219 | Hall Thomas E | Marietta, OH 45750 | Oil & Gas Operator | Dec 2021 |
| 12220 | Hall, D. Corporation | La Grange, TX 78945 | Oil & Gas Operator | Mar 2013 |
| 12221 | Hall, E. G., Oil Co. | Mexia, TX 76667 | Oil & Gas Operator | May 2026 |
| 12222 | Hall, J.J. Operating Co., Inc. | Lakewood, CO 80215 | Oil Operator | Jan 2005 |
| 12223 | Hall, James H ( Trust) | | Gas Operator | Dec 2007 |
| 12224 | Hall, Michael Wayne | Toronto, KS 66777 | Oil Operator | Dec 2009 |
| 12225 | Hall-Hargraves, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 12226 | Hall-Houston Expl. II, L.P. | Houston, TX 77027 | Oil & Gas Operator | May 2026 |
| 12227 | Hall-Houston Expl. III, L.P. | Houston, TX 77027 | Oil & Gas Operator | Jul 2013 |
| 12228 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 12229 | Hallador Petroleum Company | | Oil & Gas Operator | Feb 1992 |
| 12230 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 12231 | Hallar Enterprises, Inc. | | Oil Operator | Oct 2007 |
| 12232 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 12233 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 12234 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 12235 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | May 2026 |
| 12236 | Hallmark Oil And Gas Co., Inc. | | Oil & Gas Operator | Dec 2024 |
| 12237 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 12238 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 12239 | Hallum Lee Leverett | Marietta, OK 73448 | Oil Operator | Jan 2026 |
| 12240 | Hallwell Gas & Oil Co. | | Oil & Gas Operator | Sep 1985 |
| 12241 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 12242 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 12243 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 12244 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 12245 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 12246 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | May 2026 |
| 12247 | Halter Ralph P | Robertsville, OH 44670 | Oil Operator | Dec 1999 |
| 12248 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 12249 | Halvey Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 12250 | Ham Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2000 |
| 12251 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 12252 | Hamblin Ralph Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 1991 |
| 12253 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 12254 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Feb 2026 |
| 12255 | Hamill Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1999 |
| 12256 | Hamill, Claud B. Estate Of | Houston, TX 77002 | Oil & Gas Operator | Nov 1995 |
| 12257 | Hamill, Flora Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | May 2026 |
| 12258 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 12259 | Hamilton Brother | | Gas Operator | May 1993 |
| 12260 | Hamilton Brothers | Plainview, TX 79073 | Oil & Gas Operator | Mar 2008 |
| 12261 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 12262 | Hamilton K M Oil & Gas Co | Ada, OK 74820 | Oil Operator | Jan 2013 |
| 12263 | Hamilton Leonard O | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 12264 | Hamilton, Clay | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2026 |
| 12265 | Hamilton, J. R. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2026 |
| 12266 | Hamilton, John M. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2001 |
| 12267 | Hamilton, W. B., Estate | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2004 |
| 12268 | Hamilton-Tedford Oper. Co., LLC | Wichita Falls, TX 76301 | Oil Operator | May 2007 |
| 12269 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 12270 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 12271 | Hamm, Richard | Monahans, TX 79756 | Oil & Gas Operator | Mar 1994 |
| 12272 | Hamm, Richard Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2026 |
| 12273 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | May 2026 |
| 12274 | Hamman, Blake | Graham, TX 76450 | Oil & Gas Operator | Jul 2020 |
| 12275 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 12276 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 12277 | Hammer Oil Company | Post, TX 79356 | Oil & Gas Operator | Jun 2002 |
| 12278 | Hammer Oil Properties Inc | Enid, OK 73706-0144 | Oil & Gas Operator | Oct 2017 |
| 12279 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 12280 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 12281 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 12282 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Dec 2025 |
| 12283 | Hammersmith, Beverly | West Falls, NY 14170 | Gas Operator | Dec 2024 |
| 12284 | Hammon Properties | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1996 |
| 12285 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 12286 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 12287 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 12288 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 12289 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 12290 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 12291 | Hampton Oil & Gas | Early, TX 76802 | Gas Operator | Feb 2012 |
| 12292 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 12293 | Hampton, Jno. W. & Son | Wichita Falls, TX 76302 | Oil & Gas Operator | Nov 1998 |
| 12294 | Hanaco Operating | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 12295 | Hanaco, LLC | Holliday, TX 76366 | Oil Operator | Dec 2017 |
| 12296 | Hanagan Petroleum Corp | Roswell, NM 88201 | Oil & Gas Operator | Sep 1999 |
| 12297 | Hancock Leon | Kingston, OK 73439-9618 | Oil Operator | Dec 2014 |
| 12298 | Hancock, Burton W | Morrison, CO 80465 | Oil & Gas Operator | Dec 2017 |
| 12299 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 12300 | Handy, Daniel G. | East Aurora, NY 14052 | Gas Operator | Dec 2024 |