| 201 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 202 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |
| 203 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 204 | Fourpoint Energy, LLC | Denver, CO 80206 | Oil & Gas Operator | Jul 2025 |
| 205 | G P II Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2020 |
| 206 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 207 | Gco Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 208 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | May 2025 |
| 209 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 210 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 211 | Giebel Petroleum LTD. | Midland, TX 79705 | Oil & Gas Operator | Jul 2019 |
| 212 | Gilliam'S Aghorn Energy | Odessa, TX 79768 | Oil & Gas Operator | May 1997 |
| 213 | Golden, Marty Joe | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 214 | Gould Energy Co. | Owasso, OK 74055 | Oil & Gas Operator | Mar 2005 |
| 215 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 216 | GRB Properties, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2003 |
| 217 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 218 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 219 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 220 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 221 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 222 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 223 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Jul 2025 |
| 224 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 225 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Apr 2025 |
| 226 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 227 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 228 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 229 | Heifer Production Company LLC | Houston, TX 77098 | Oil & Gas Operator | Jul 2025 |
| 230 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 231 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 232 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 233 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 234 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Jul 2025 |
| 235 | Heritage Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2014 |
| 236 | Heritage Standard Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 237 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 238 | HGB Oil Company | Denver, CO 80224 | Oil Operator | Mar 2006 |
| 239 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 240 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 241 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 242 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 243 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 244 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 245 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 246 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2023 |
| 247 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 248 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 249 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 250 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |
| 251 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 252 | Independence Resources MGMT, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2021 |
| 253 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Jul 2025 |
| 254 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 255 | JMW Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 256 | JPM Eoc Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2016 |
| 257 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 258 | Kastman Oil Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 2012 |
| 259 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 260 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 261 | Keystone Energy LLC | Farmington, NM 87499 | Oil & Gas Operator | May 2025 |
| 262 | Keystone Petroleum GP LLC | Irving, TX 75039 | Oil & Gas Operator | May 2012 |
| 263 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 264 | King Oil & Resources Co | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 265 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 266 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 267 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2024 |
| 268 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 269 | Ladd LLC | El Reno, OK 73036 | Oil & Gas Operator | Nov 2018 |
| 270 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 271 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Jul 2025 |
| 272 | Langford & Brigham Operating LLC | Austin, TX 78730 | Oil & Gas Operator | Jul 2025 |
| 273 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 274 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 275 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 276 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 277 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 278 | LCX Energy, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2010 |
| 279 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 280 | Leggett Oil Company | Dallas, TX 75379 | Oil & Gas Operator | Oct 1999 |
| 281 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 282 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 283 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 284 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 285 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 286 | Lothian Oil Texas I, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 287 | Lubbock Energy, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Oct 1996 |
| 288 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 289 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 290 | Magnatex Corp | Midland, TX 79702-1311 | Oil & Gas Operator | Feb 1995 |
| 291 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 292 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 293 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 294 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 295 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 296 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Jul 2025 |
| 297 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 298 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 299 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 300 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |