| 201 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 202 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2026 |
| 203 | Grasen Energy, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2013 |
| 204 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | May 2026 |
| 205 | Gribble Oil Corporation | Dallas, TX 75235 | Oil Operator | Aug 1994 |
| 206 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2026 |
| 207 | Grizzly Energy Resources, L.L.C. | Midland, TX 79705 | Oil & Gas Operator | Mar 2026 |
| 208 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2026 |
| 209 | Gross Jack L Production | Borger, TX 79008-0065 | Gas Operator | Mar 2015 |
| 210 | Gruenerwald WM & Assoc Inc | Colorado Spring, CO 80960-0669 | Oil & Gas Operator | Jan 2002 |
| 211 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Apr 2014 |
| 212 | Gulf Production Corp. | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 213 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | May 2026 |
| 214 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 215 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 216 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | May 2026 |
| 217 | Halcon Holdings, Inc. | Ada, OK 74820 | Oil & Gas Operator | Apr 2026 |
| 218 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2026 |
| 219 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 220 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 221 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 222 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | May 2026 |
| 223 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 224 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 225 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 226 | Highmark Energy Operating, LLC | Houston, TX 77253 | Oil & Gas Operator | Jul 2026 |
| 227 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 228 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | May 2026 |
| 229 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 230 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 231 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 232 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 233 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 234 | Hunt Chris Water Hauling Contractor Inc | Keyes, OK 73947-0004 | Oil Operator | Jun 2008 |
| 235 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 236 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 237 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 238 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jul 2026 |
| 239 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 240 | Invoil, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2026 |
| 241 | J&R Operating | Holliday, TX 76366 | Oil & Gas Operator | Feb 2024 |
| 242 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2026 |
| 243 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 244 | Jackson Donald W Trust | Blue Eye, MO 65611-7293 | Gas Operator | Aug 2015 |
| 245 | Jaw Oil Co. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 1997 |
| 246 | JCB II Enterprises LLC | Perryton, TX 79070 | Oil & Gas Operator | Jun 2023 |
| 247 | JCS Operating LLC | Guymon, OK 73942 | Oil & Gas Operator | Apr 2026 |
| 248 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Apr 2026 |
| 249 | Jet Oil Co12/Ofb See 18649 | | Oil & Gas Operator | Jul 2007 |
| 250 | Jetta Operating Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 251 | JKB Resources LLC | Stigler, OK 74462 | Oil & Gas Operator | May 2026 |
| 252 | Jma Resources Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2026 |
| 253 | JNC Resources Company | Tulsa, OK 74119 | Gas Operator | May 1999 |
| 254 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 255 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2026 |
| 256 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Apr 2026 |
| 257 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 258 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Apr 2026 |
| 259 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 260 | Keith F Walker Oil & Gas Company LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2026 |
| 261 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 262 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 263 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | May 2026 |
| 264 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 265 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 266 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 267 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2026 |
| 268 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 269 | Kickapoo Oil Co | Baton Rouge, LA 70815 | Gas Operator | Feb 1994 |
| 270 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 271 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2026 |
| 272 | Kleen Oilfield Services Co | Velma, OK 73491-0178 | Oil & Gas Operator | Apr 2026 |
| 273 | KN Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 274 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 275 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 276 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Jul 2026 |
| 277 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 278 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 279 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 280 | Landmark Exploration Co | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2013 |
| 281 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2026 |
| 282 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | May 2026 |
| 283 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 284 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 285 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 286 | Lobo Exploration Company | Yukon, OK 73099 | Oil & Gas Operator | Apr 2026 |
| 287 | Lobo Petroleum Inc | Guymon, OK 73942-0714 | Oil Operator | Jul 2016 |
| 288 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Jul 2026 |
| 289 | Lone Star Resources Company | Keyes, OK 73947 | Oil & Gas Operator | Mar 2015 |
| 290 | LX4, LLC | Gage, OK 73843 | Oil Operator | May 2026 |
| 291 | Mahan, Janet L | | Oil & Gas Operator | Apr 2026 |
| 292 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 293 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 294 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 295 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | May 2026 |
| 296 | Marjo Operating Co., Inc. | Tulsa, OK 741010729 | Oil & Gas Operator | Apr 2026 |
| 297 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2026 |
| 298 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Mar 2026 |
| 299 | Martin'S Resources LLC | Woodward, OK 73801-5641 | Oil & Gas Operator | May 2026 |
| 300 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |