| 12201 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 12202 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 12203 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Nov 2025 |
| 12204 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 12205 | H And H | Gonzales, TX 78629 | Oil Operator | Feb 1999 |
| 12206 | H And H Star Energy Inc Dba Petrostar Energy | | Oil & Gas Operator | Feb 2004 |
| 12207 | H And K Resources Inc | | Oil Operator | Dec 2012 |
| 12208 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 12209 | H C M Energy LLC | Billings, MT 59102 | Oil Operator | Jul 2003 |
| 12210 | H D Oil Company | Thermopolis, WY 82443 | Oil Operator | Aug 2025 |
| 12211 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 12212 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 12213 | H F Production Co., LTD. | Wichita Falls, TX 76309 | Oil Operator | Feb 2020 |
| 12214 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 12215 | H G H Oil Company | | Oil Operator | Dec 1990 |
| 12216 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 12217 | H H H Oil Company | | Oil Operator | Jan 2025 |
| 12218 | H I Smith Oil & Gas Inc | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2024 |
| 12219 | H K A Enterprises Inc | Kettle, KY 42717 | Oil Operator | Dec 2021 |
| 12220 | H K Keesee And C J Keesee Trust | Farmington, NM 87499 | Gas Operator | Jul 2025 |
| 12221 | H L Altier Service Co Inc | Canton, OH 44718-3752 | Oil & Gas Operator | Dec 2013 |
| 12222 | H L Brown Jr | Midland, TX 79702 | Oil & Gas Operator | May 2001 |
| 12223 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 12224 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 12225 | H M Jarred & Walsh-Watts | | Oil & Gas Operator | Sep 1992 |
| 12226 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 12227 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 12228 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Jul 2025 |
| 12229 | H R E Rental Company | Premont, TX 78375 | Oil & Gas Operator | Sep 2015 |
| 12230 | H R F Antrim LP | | Gas Operator | Aug 2025 |
| 12231 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 12232 | H&K Energy | Stockdale, TX 78160 | Oil & Gas Operator | Jul 2005 |
| 12233 | H&M Production, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Aug 2012 |
| 12234 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Nov 2025 |
| 12235 | H&P Operating | Megargel, TX 76370 | Oil & Gas Operator | Jan 2015 |
| 12236 | H&S Production, LLC | | Oil Operator | Nov 2024 |
| 12237 | H-30 Incorporate | | Oil & Gas Operator | Nov 1990 |
| 12238 | H-30, Inc. | Wichita, KS 67202 | Gas Operator | Oct 2006 |
| 12239 | H-40 Drilling, Inc. | Medicine Lodge, KS 67104 | Gas Operator | Jun 2025 |
| 12240 | H-5 Service | Plainville, KS 67663 | Oil Operator | May 1989 |
| 12241 | H-D Oilfield Service, Inc. | Bazine, KS 67516 | Oil Operator | Jun 2025 |
| 12242 | H-D Operating Services L.L.C. | Pampa, TX 79065 | Oil Operator | Nov 2025 |
| 12243 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 12244 | H-Petro-R Inc | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 12245 | H-S Exploration | Gunnison, CO 81230 | Oil & Gas Operator | Nov 2025 |
| 12246 | H-Two-O Investments | Iowa Park, TX 76367 | Oil Operator | Sep 2019 |
| 12247 | H. & H. Development Co. | | Gas Operator | Aug 2019 |
| 12248 | H. & J. Drilling Company | Fort Worth, TX 76114 | Oil & Gas Operator | Aug 2003 |
| 12249 | H. & L. Oil Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2005 |
| 12250 | H. A. Harper | | Oil Operator | Dec 1982 |
| 12251 | H. B. McCullough | | Oil Operator | Oct 2004 |
| 12252 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 12253 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Nov 2025 |
| 12254 | H. D. Investments | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 12255 | H. D. McCormick | | Oil & Gas Operator | Jun 2016 |
| 12256 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 12257 | H. G. Oil Operator | | Oil Operator | Mar 2001 |
| 12258 | H. H. Blair Oil Company, Inc. | Atlanta, KS 67008 | Oil Operator | Dec 2009 |
| 12259 | H. I. M. Producers | Graham, TX 76450 | Oil & Gas Operator | May 1999 |
| 12260 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 12261 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 12262 | H. K. Beebe | | Oil Operator | Jan 1990 |
| 12263 | H. L. Hunt | | Oil & Gas Operator | Jun 1980 |
| 12264 | H. L. McKee & J. P. McKee Jr. | | Gas Operator | Mar 2023 |
| 12265 | H. L. Richey | | Oil & Gas Operator | Sep 1995 |
| 12266 | H. O. Strickler Operator | | Oil & Gas Operator | Dec 1993 |
| 12267 | H. Olsen & Sons Contractors, Inc. | Forestville, NY 14062 | Gas Operator | Dec 2024 |
| 12268 | H. Proler-Luffey Gas Corp. | | Gas Operator | Apr 1979 |
| 12269 | H. T. Hilliard & Co. | | Oil & Gas Operator | Dec 1999 |
| 12270 | H. W. Reynolds Jr. | | Gas Operator | Dec 1984 |
| 12271 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 12272 | H.D. Smith, Inc. | Waller, TX 77484 | Oil Operator | Nov 2025 |
| 12273 | H.E. Sutton, Et Al | | Oil & Gas Operator | Jan 1990 |
| 12274 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | Nov 2025 |
| 12275 | H.E.X.T. Operating, LTD. | Buna, TX 77612 | Oil Operator | Mar 2024 |
| 12276 | H.I.T. Resources, Inc. | Arkansas City, KS 67005 | Oil Operator | Jan 2007 |
| 12277 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | Nov 2025 |
| 12278 | H.L. Clark Oil Company LLC | Whitesboro, TX 76273 | Oil Operator | Nov 2025 |
| 12279 | H.L. Hall & Sons LLC | | Oil & Gas Operator | Dec 2011 |
| 12280 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 12281 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 12282 | H.P. Slagel Producing Co., LLC | San Angelo, TX 76902 | Oil Operator | Nov 2025 |
| 12283 | H.T. Olsen Oil & Gas Operations | | Oil & Gas Operator | Sep 2025 |
| 12284 | H2oil Services LLC | | Oil Operator | Aug 2025 |
| 12285 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Jul 2025 |
| 12286 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Jul 2025 |
| 12287 | H3 Oil & Gas | | Oil & Gas Operator | Jun 2025 |
| 12288 | H3 Operating, LLC | Springtown, TX 76082 | Oil & Gas Operator | May 2020 |
| 12289 | Ha Goal Inc | Indiana, PA 15701-2664 | Oil & Gas Operator | Dec 2018 |
| 12290 | Ha.P.C. Oil, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Aug 2006 |
| 12291 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Apr 2025 |
| 12292 | Haas John L | | Oil Operator | Dec 2009 |
| 12293 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Jun 2025 |
| 12294 | Haas, C. F. Oil & Gas Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 2025 |
| 12295 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 12296 | Haass Ranch Oil Company, LLC | Castroville, TX 78009 | Oil Operator | Nov 2025 |
| 12297 | Habanero Oil & Gas Operating,LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2018 |
| 12298 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 12299 | Habetz Oilfield Saltwater Ser, Inc | | Oil Operator | Dec 2024 |
| 12300 | Habit Petroleum | | Oil Operator | Dec 2009 |