| 201 | Fellows Energy LTD | Price, UT 84501-2016 | Gas Operator | Sep 2007 |
| 202 | Fidelity E&P Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2016 |
| 203 | Fiml Natural Resources LLC (FNR) | Denver, CO 80202-4438 | Oil & Gas Operator | Jul 2014 |
| 204 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 205 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Mar 2026 |
| 206 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 207 | First Zone Production | Salt Lake City, UT 84102 | Oil & Gas Operator | Dec 1997 |
| 208 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 209 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 210 | Flying Diamond Oil Corp | | Oil & Gas Operator | Dec 1983 |
| 211 | Flying J Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Jul 1995 |
| 212 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 213 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 214 | Fortune Oil LTD | Salt Lake City, UT 84106 | Oil & Gas Operator | May 1987 |
| 215 | Foster Energy Group, LLC | Wolfforth, TX 79382 | Oil & Gas Operator | Feb 2026 |
| 216 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2026 |
| 217 | Four Corners Energy, LLC | Gulf Breeze, FL 32563 | Oil & Gas Operator | Mar 2026 |
| 218 | Fourpoint Resources, LLC | Denver, CO 80206 | Oil & Gas Operator | Jan 2026 |
| 219 | Freedom Energy Inc | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Mar 2026 |
| 220 | Fuel Explor Inc (Fuelex) | | Oil & Gas Operator | Sep 1998 |
| 221 | Gas & Oil Management Inc | Englewood, CO 80112 | Oil & Gas Operator | Dec 1974 |
| 222 | Gas Producing Enterprises | Houston, TX 77046 | Oil & Gas Operator | Dec 1983 |
| 223 | Gasco Production Company | Denver, CO 80237 | Oil & Gas Operator | Dec 2015 |
| 224 | Gavilan Petroleum Inc | Park City, UT 84060 | Oil & Gas Operator | Dec 2006 |
| 225 | General Minerals Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2015 |
| 226 | General Petroleum Corp | Sand Springs, OK 74063-6646 | Oil & Gas Operator | Jul 2015 |
| 227 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Mar 2026 |
| 228 | Geophysical Survey Company | Grand Junction, CO 81503-1296 | Oil & Gas Operator | Jan 1996 |
| 229 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 230 | Giant Explor & Prod Co | Farmington, NM 87499 | Oil & Gas Operator | Aug 1996 |
| 231 | Gilmore Oil And Gas Co | Austin, TX 78768-4729 | Oil & Gas Operator | Jan 1997 |
| 232 | Global Natural Res Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 1994 |
| 233 | Gordon Creek, LLC | Calgary, AB T2P 3P8 | Gas Operator | Oct 2019 |
| 234 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 235 | Graham Energy LTD | Houston, TX 77024 | Oil & Gas Operator | Mar 1994 |
| 236 | Graham Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1988 |
| 237 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 238 | Grand Resources | Salt Lake City, UT 84115 | Oil & Gas Operator | Apr 1992 |
| 239 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 240 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 241 | Greenwood Holding Inc | Englewood, CO 80110 | Oil & Gas Operator | Jun 1993 |
| 242 | Greylock Production LLC | Charleston, WV 25311-1264 | Oil & Gas Operator | Jan 2026 |
| 243 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 244 | Guffey & Galey | | Oil & Gas Operator | Aug 1981 |
| 245 | Gulf Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Jun 1987 |
| 246 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 247 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 248 | GW Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1993 |
| 249 | Hadden, Pennell & Rohret | Lakewood, CO 80228 | Oil Operator | Nov 1994 |
| 250 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 251 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 252 | Hancock, Burton W | Morrison, CO 80465 | Oil & Gas Operator | Dec 2017 |
| 253 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 254 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Sep 2025 |
| 255 | Harrison, Thomas D | Park City, UT 84060-7307 | Gas Operator | Dec 1998 |
| 256 | Harvest (Us) Holdings, Inc | Houston, TX 77077 | Oil & Gas Operator | Apr 2011 |
| 257 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 258 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 259 | Hershey Oil | Pasadena, CA 91103 | Oil & Gas Operator | Dec 1988 |
| 260 | Hiko Bell Mining & Oil Co | Vernal, UT 84078 | Oil & Gas Operator | Oct 2003 |
| 261 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 262 | Hill, Gillman A | Englewood, CO 80112 | Oil & Gas Operator | Jun 1993 |
| 263 | Holcomb Oil & Gas Inc | Farmington, NM 87401 | Oil & Gas Operator | Nov 2025 |
| 264 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 265 | Hollandsworth & Travis Oil | Longview, TX 75606 | Oil Operator | May 2003 |
| 266 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2026 |
| 267 | Homeland Gas & Oil, Inc | Roosevelt, UT 84066-1574 | Oil & Gas Operator | Jan 2026 |
| 268 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 269 | Hot Rod Oil | Vernal, UT 84078 | Oil & Gas Operator | Jan 2026 |
| 270 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 271 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Sep 2025 |
| 272 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 273 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 274 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 275 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 276 | Huntford Resources Corp | Englewood, CO 80112 | Oil & Gas Operator | Nov 2001 |
| 277 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 278 | Hyland Oil Corporation | | Oil & Gas Operator | Apr 1990 |
| 279 | Iacx Energy LLC | Dallas, TX 75244 | Gas Operator | Feb 2026 |
| 280 | Industrial Gas Services Inc | Wheat Ridge, CO 80033 | Oil & Gas Operator | Feb 2023 |
| 281 | Inland Production Company | Vernal, UT 84079 | Oil & Gas Operator | Dec 2004 |
| 282 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 283 | Interline Resources Corp | Casper, WY 82601 | Oil & Gas Operator | Oct 2009 |
| 284 | Intrepid Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 285 | Ironwood Exploration Inc | | Oil & Gas Operator | Mar 1995 |
| 286 | J & L Oil Company | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 287 | J C Thompson Operator LLC | Greenwood, CO 80111-2919 | Oil & Gas Operator | Jul 2012 |
| 288 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2026 |
| 289 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 290 | Jacobs, R L Oil & Gas Co | Grand Junction, CO 81503 | Oil & Gas Operator | Oct 1986 |
| 291 | Javelin Energy Partners Management, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 292 | Jenex Petroleum Corp | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2026 |
| 293 | JN Exploration & Prod | Billings, MT 59103-0159 | Oil & Gas Operator | Jan 2001 |
| 294 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 295 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 296 | Kenneth D Luff | | Oil & Gas Operator | Dec 1983 |
| 297 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 298 | KGH Operating Company | Billings, MT 59115 | Oil & Gas Operator | Dec 2025 |
| 299 | Kings Peak Energy LLC | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 300 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |