| 12201 | H & L Operators | | Oil & Gas Operator | Dec 2002 |
| 12202 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 12203 | H & M Oil Producers | Littleton, CO 80160 | Oil & Gas Operator | Apr 2000 |
| 12204 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 12205 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | May 2025 |
| 12206 | H & M Productions L.L.C. | Overland Park, KS 66210 | Oil Operator | May 1998 |
| 12207 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 12208 | H & O Oil Co. | | Oil & Gas Operator | Dec 1989 |
| 12209 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 12210 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 12211 | H & P Partnership | La Vernia, TX 78121 | Oil Operator | Jul 2025 |
| 12212 | H & R Exploratio | | Oil Operator | Feb 1992 |
| 12213 | H & R Exploration & Production, Inc. | Sidney, NE 69162 | Oil Operator | May 2007 |
| 12214 | H & R Oil Company | | Oil & Gas Operator | Dec 2000 |
| 12215 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 12216 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 12217 | H & S Investments LLC | Fairview, PA 16415-1807 | Oil & Gas Operator | Dec 2024 |
| 12218 | H & S Oil Co., LLC | Cherryvale, KS 67335 | Oil Operator | Oct 2024 |
| 12219 | H & S Oil LLC | Roswell, NM 882022387 | Oil & Gas Operator | Jul 2013 |
| 12220 | H & S Operating Co., Inc. | Winesburg, OH 44690 | Oil & Gas Operator | Dec 2024 |
| 12221 | H & S Production | Farmington, NM 87401 | Oil Operator | Dec 2007 |
| 12222 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 12223 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 12224 | H & T Disposal | Abilene, TX 79608 | Oil Operator | Apr 2003 |
| 12225 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | Jul 2025 |
| 12226 | H & T Oil & Gas Company, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2008 |
| 12227 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 12228 | H & W Energy | Youngstown, OH 44512 | Oil & Gas Operator | Dec 2015 |
| 12229 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 12230 | H & W Oil | Electra, TX 76360 | Oil & Gas Operator | Mar 2008 |
| 12231 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 12232 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 12233 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 12234 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 12235 | H And H | Gonzales, TX 78629 | Oil Operator | Feb 1999 |
| 12236 | H And H Star Energy Inc Dba Petrostar Energy | | Oil & Gas Operator | Feb 2004 |
| 12237 | H And K Resources Inc | | Oil Operator | Dec 2012 |
| 12238 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 12239 | H C M Energy LLC | Billings, MT 59102 | Oil Operator | Jul 2003 |
| 12240 | H D Oil Company | Thermopolis, WY 82443 | Oil Operator | Jun 2025 |
| 12241 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 12242 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 12243 | H F Production Co., LTD. | Wichita Falls, TX 76309 | Oil Operator | Feb 2020 |
| 12244 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 12245 | H G H Oil Company | | Oil Operator | Dec 1990 |
| 12246 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 12247 | H H H Oil Company | | Oil Operator | Jan 2025 |
| 12248 | H I Smith Oil & Gas Inc | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2024 |
| 12249 | H K A Enterprises Inc | Kettle, KY 42717 | Oil Operator | Dec 2021 |
| 12250 | H K Keesee And C J Keesee Trust | Farmington, NM 87499 | Gas Operator | May 2025 |
| 12251 | H L Altier Service Co Inc | Canton, OH 44718-3752 | Oil & Gas Operator | Dec 2013 |
| 12252 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 12253 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 12254 | H M Jarred & Walsh-Watts | | Oil & Gas Operator | Sep 1992 |
| 12255 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 12256 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 12257 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Apr 2025 |
| 12258 | H R E Rental Company | Premont, TX 78375 | Oil & Gas Operator | Sep 2015 |
| 12259 | H R F Antrim LP | | Gas Operator | May 2025 |
| 12260 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 12261 | H&K Energy | Stockdale, TX 78160 | Oil & Gas Operator | Jul 2005 |
| 12262 | H&M Production, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Aug 2012 |
| 12263 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Jul 2025 |
| 12264 | H&P Operating | Megargel, TX 76370 | Oil & Gas Operator | Jan 2015 |
| 12265 | H&S Production, LLC | | Oil Operator | Nov 2024 |
| 12266 | H-30 Incorporate | | Oil & Gas Operator | Nov 1990 |
| 12267 | H-30, Inc. | Wichita, KS 67202 | Gas Operator | Oct 2006 |
| 12268 | H-40 Drilling, Inc. | Medicine Lodge, KS 67104 | Gas Operator | Mar 2025 |
| 12269 | H-5 Service | Plainville, KS 67663 | Oil Operator | May 1989 |
| 12270 | H-D Oilfield Service, Inc. | Bazine, KS 67516 | Oil Operator | Feb 2025 |
| 12271 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 12272 | H-Petro-R Inc | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 12273 | H-S Exploration | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 12274 | H-Two-O Investments | Iowa Park, TX 76367 | Oil Operator | Sep 2019 |
| 12275 | H. & H. Development Co. | | Gas Operator | Aug 2019 |
| 12276 | H. & J. Drilling Company | Fort Worth, TX 76114 | Oil & Gas Operator | Aug 2003 |
| 12277 | H. & L. Oil Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2005 |
| 12278 | H. & N. Operating Co., Inc. | | Oil & Gas Operator | Oct 1997 |
| 12279 | H. A. Harper | | Oil Operator | Dec 1982 |
| 12280 | H. B. McCullough | | Oil Operator | Oct 2004 |
| 12281 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 12282 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Jul 2025 |
| 12283 | H. D. Investments | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 12284 | H. D. McCormick | | Oil & Gas Operator | Jun 2016 |
| 12285 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 12286 | H. G. Oil Operator | | Oil Operator | Mar 2001 |
| 12287 | H. H. Blair Oil Company, Inc. | Atlanta, KS 67008 | Oil Operator | Dec 2009 |
| 12288 | H. I. M. Producers | Graham, TX 76450 | Oil & Gas Operator | May 1999 |
| 12289 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 12290 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 12291 | H. K. Beebe | | Oil Operator | Jan 1990 |
| 12292 | H. L. Brown, Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2001 |
| 12293 | H. L. Hunt | | Oil & Gas Operator | Jun 1980 |
| 12294 | H. L. McKee & J. P. McKee Jr. | | Gas Operator | Mar 2023 |
| 12295 | H. L. Richey | | Oil & Gas Operator | Sep 1995 |
| 12296 | H. O. Strickler Operator | | Oil & Gas Operator | Dec 1993 |
| 12297 | H. Olsen & Sons Contractors, Inc. | Forestville, NY 14062 | Gas Operator | Dec 2024 |
| 12298 | H. Proler-Luffey Gas Corp. | | Gas Operator | Apr 1979 |
| 12299 | H. T. Hilliard & Co. | | Oil & Gas Operator | Dec 1999 |
| 12300 | H. W. Reynolds Jr. | | Gas Operator | Dec 1984 |