| 13201 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 13202 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Jun 2025 |
| 13203 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Jun 2025 |
| 13204 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 13205 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 13206 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jun 2025 |
| 13207 | High Plains Oil | | Oil Operator | Jun 1989 |
| 13208 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
| 13209 | High Plains Operating, LLC | | Oil Operator | May 2025 |
| 13210 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |
| 13211 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Feb 2025 |
| 13212 | High Point Produ | | Gas Operator | May 1996 |
| 13213 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jun 2025 |
| 13214 | High River Resources Operating LLC | Farmington, NM 87401 | Oil & Gas Operator | Apr 2025 |
| 13215 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 13216 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 13217 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 13218 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 13219 | High Splint Gas & Oil, Inc | Greenville, KY 42345 | Oil Operator | Dec 2023 |
| 13220 | High Summit Oil & Gas Inc | | Oil & Gas Operator | Sep 1987 |
| 13221 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 13222 | High-Line Production Services LLC | | Oil & Gas Operator | Nov 2024 |
| 13223 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Jun 2025 |
| 13224 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 13225 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 2025 |
| 13226 | Highhouse James R | Warren, PA 16365-7550 | Oil & Gas Operator | Dec 2008 |
| 13227 | Highland Exploration | | Oil Operator | Sep 1979 |
| 13228 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 13229 | Highland Oil & Gas Co | Mason, OH 45040 | Oil Operator | Dec 2022 |
| 13230 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 13231 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 13232 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 13233 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 13234 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 13235 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 13236 | Highline Exploration, Inc. | Tuscaloosa, AL 35402 | Gas Operator | Nov 2020 |
| 13237 | Highman Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2024 |
| 13238 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jun 2025 |
| 13239 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 13240 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 13241 | Highmount Midwest Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 13242 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 13243 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 13244 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 13245 | Highpointe Oil & Gas LLC | Indiana, PA 15701-8944 | Gas Operator | Dec 2024 |
| 13246 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Mar 2025 |
| 13247 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | Jun 2025 |
| 13248 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 13249 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 13250 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 13251 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 13252 | Hiko Bell Mining & Oil Co | Vernal, UT 84078 | Oil & Gas Operator | Oct 2003 |
| 13253 | Hilbers Oil & Gas | Archer City, TX 76351 | Oil & Gas Operator | Oct 2002 |
| 13254 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 13255 | Hilcorp Alaska, LLC | | Oil & Gas Operator | Apr 2025 |
| 13256 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jun 2025 |
| 13257 | Hilcorp North Slope, LLC | | Oil & Gas Operator | Apr 2025 |
| 13258 | Hilden Oil Co Inc | | Oil & Gas Operator | Oct 2024 |
| 13259 | Hildreth, Roy G & Son Inc | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 13260 | Hildreth, Va Roy | | Oil & Gas Operator | Dec 1996 |
| 13261 | Hildreth, William H & David Dale | | Oil & Gas Operator | Dec 2021 |
| 13262 | Hill Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1997 |
| 13263 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 13264 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 13265 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 13266 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Mar 2025 |
| 13267 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 13268 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 13269 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 13270 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 13271 | Hill Production Company No. 2 | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 13272 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 13273 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 13274 | Hill William F | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1993 |
| 13275 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 13276 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13277 | Hill, Albert, Trust | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13278 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 13279 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Jun 2025 |
| 13280 | Hill, Gillman A | Englewood, CO 80112 | Oil & Gas Operator | Jun 1993 |
| 13281 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 13282 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 13283 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 13284 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |
| 13285 | Hill-Lake Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Jun 2025 |
| 13286 | Hillary Oil Comp | | Oil & Gas Operator | Apr 1991 |
| 13287 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 13288 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 13289 | Hillenburg Oil Co., A General Partnership | Broken Arrow, OK 74011 | Oil Operator | Feb 2025 |
| 13290 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 13291 | Hilliard Oil | Bronte, TX 76933 | Oil & Gas Operator | Mar 2008 |
| 13292 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 13293 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 13294 | Hilliker Oil Com | | Oil Operator | Jul 1984 |
| 13295 | Hilliker Production | Indian Wells, CA 92210 | Oil & Gas Operator | Jul 2007 |
| 13296 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 13297 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 13298 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 13299 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 13300 | Hills Dozer Service | Stroud, OK 74079 | Oil & Gas Operator | Mar 2022 |