| 201 | Houseknecht Oil Producers Inc | | Oil & Gas Operator | Dec 1994 |
| 202 | Howard Energy Co Inc | | Oil & Gas Operator | Aug 2011 |
| 203 | Hoy Production LLC | | Gas Operator | Nov 2025 |
| 204 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Dec 2025 |
| 205 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |
| 206 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 207 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 208 | Immink Merle | | Oil & Gas Operator | Dec 2025 |
| 209 | Investment Land Services Inc | | Oil Operator | Oct 2001 |
| 210 | Isbrandtsen Oil And Gas Co | | Oil Operator | Mar 2002 |
| 211 | J 5 Inc | | Gas Operator | Nov 2014 |
| 212 | J And D Evart Production LLC | | Oil Operator | Dec 2025 |
| 213 | J D B Energy LLC | | Gas Operator | Nov 2016 |
| 214 | J F C O LLC | | Gas Operator | Dec 2019 |
| 215 | J K R Oil And Gas Inc | Midland, TX BAD ADDR | Oil & Gas Operator | Jan 2003 |
| 216 | J&J Oil | La Vernia, TX 78121 | Oil & Gas Operator | Dec 2025 |
| 217 | Jaguar Energy LLC | | Oil & Gas Operator | Jun 2022 |
| 218 | Jennings Petroleum And Enveron Corp | | Oil & Gas Operator | Mar 2017 |
| 219 | Jennings Petroleum Corp | | Oil & Gas Operator | Dec 1988 |
| 220 | Jet Exploration 1995-1 LLC | | Gas Operator | Jan 2000 |
| 221 | Jet Exploration Inc | | Oil & Gas Operator | May 1998 |
| 222 | Jet Oil Corp | | Oil & Gas Operator | Feb 1999 |
| 223 | Jetta Operating Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 224 | Jonesville Ventures Inc | | Oil & Gas Operator | May 1988 |
| 225 | Jordan Development Company LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2025 |
| 226 | Jordan Energy Exploration Co LLC | | Oil Operator | Dec 2022 |
| 227 | Jupiter Oil Corp | | Oil & Gas Operator | Aug 2025 |
| 228 | K C S Michigan Resources Inc | | Oil & Gas Operator | Mar 2004 |
| 229 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 230 | Kalkaska Oilfield Services Inc | | Oil Operator | Aug 2006 |
| 231 | Kasperski Oil Corp | | Oil & Gas Operator | May 2002 |
| 232 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 233 | Kelly James O | | Oil & Gas Operator | Apr 2000 |
| 234 | Kelly James O Dba Kelly Oil Co | | Oil & Gas Operator | Aug 1987 |
| 235 | Kelly Oil And Gas Inc | | Oil & Gas Operator | Mar 1999 |
| 236 | Kep Exploration Inc | | Oil & Gas Operator | Feb 1991 |
| 237 | Kep Exploration Inc And Haggard Ward M | | Oil & Gas Operator | Dec 1986 |
| 238 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 239 | Kirby Exploration Co Of Texas | | Oil & Gas Operator | Nov 1993 |
| 240 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 241 | Klingler Automatic Industries Inc | | Oil & Gas Operator | Oct 2025 |
| 242 | Koyl Oil Inc | | Oil & Gas Operator | Dec 2025 |
| 243 | Kughn | | Oil Operator | Sep 2019 |
| 244 | Kulka And Schmidt Inc | | Oil & Gas Operator | Dec 1992 |
| 245 | L And G Drilling | | Oil Operator | Jun 1987 |
| 246 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 247 | Lakes And Country Realty LLC | | Oil Operator | Mar 2015 |
| 248 | Lakewood Petroleum | | Oil & Gas Operator | Sep 1993 |
| 249 | Lambda Energy Resources LLC | | Oil & Gas Operator | Nov 2025 |
| 250 | Lanphars Inc | | Gas Operator | Dec 1985 |
| 251 | Lawrence Exploration Inc | | Oil & Gas Operator | Sep 2004 |
| 252 | Layline Oil And Gas LLC | Marion, MI 49665 | Oil & Gas Operator | Nov 2025 |
| 253 | Lease Management Inc | | Oil & Gas Operator | Nov 2025 |
| 254 | Lease Management Inc And McClure Oil Co | | Oil & Gas Operator | Apr 1991 |
| 255 | Lease Management Inc And Patrick Petroleum Corp | | Oil & Gas Operator | Apr 1991 |
| 256 | Lees Petroleum LLC | | Oil & Gas Operator | Jul 2000 |
| 257 | Lignum Oil Co | | Oil & Gas Operator | Dec 1989 |
| 258 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 259 | Lithos Exploration Inc | | Oil & Gas Operator | Nov 2014 |
| 260 | Loe Petroleum & Environmental Engineering LLC | | Oil Operator | Oct 2025 |
| 261 | Lomak Petroleum Michigan Inc | | Gas Operator | Jul 1992 |
| 262 | Long Jack Senior | | Oil Operator | Jan 2004 |
| 263 | Lorenz Robert M | | Oil & Gas Operator | Oct 1984 |
| 264 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 265 | Lucas George C | | Oil Operator | Jul 2014 |
| 266 | Luchshyn Harry E And Dannemiller William F | | Oil & Gas Operator | Dec 1994 |
| 267 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 268 | M G U Development Co | | Oil & Gas Operator | Jun 1987 |
| 269 | M G U Development Co And Mask Thomas B And Ma020 | | Oil & Gas Operator | Jun 1987 |
| 270 | M J H Enterprises LC | | Oil Operator | Mar 2005 |
| 271 | M K M LTD | | Oil & Gas Operator | Jun 1998 |
| 272 | M L Energy | | Oil Operator | Feb 2015 |
| 273 | M L Energy LLC | | Oil Operator | Dec 2025 |
| 274 | M R Ventures LLC | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 275 | Mack Oil Corp | | Oil & Gas Operator | Nov 1998 |
| 276 | Mack Oil Corp And Delta Oil Co Inc Great Lakes Nia | | Oil & Gas Operator | Feb 1986 |
| 277 | Mack Oil Corp And Neyer Oil Inc | | Oil & Gas Operator | May 1988 |
| 278 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 279 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 280 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Nov 2025 |
| 281 | Mask Thomas B | | Oil & Gas Operator | Jul 1991 |
| 282 | Mask Thomas B And Markel Ray D | | Oil & Gas Operator | Jul 1991 |
| 283 | Mask Thomas B And Markel Ray D And Wood K P | | Oil & Gas Operator | Aug 1986 |
| 284 | Mask Thomas B And Patrick Petroleum Corp | | Oil & Gas Operator | Jun 1992 |
| 285 | Maskeny Edward D | | Oil & Gas Operator | Jun 1998 |
| 286 | Matrex LLC | | Gas Operator | May 2006 |
| 287 | Matrix Exploration And Development LLC | | Oil & Gas Operator | Oct 2008 |
| 288 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Dec 2025 |
| 289 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Dec 2025 |
| 290 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 291 | McConnell And Scully Inc | | Oil & Gas Operator | Dec 2025 |
| 292 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2025 |
| 293 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 294 | Meridian Production Services LLC | | Oil & Gas Operator | Dec 2025 |
| 295 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 296 | Meridian Resources LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 297 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 298 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 299 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Oct 2025 |
| 300 | Michigan Oil Company | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |