| 201 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 202 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 203 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 204 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 205 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 206 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Aug 2025 |
| 207 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Aug 2025 |
| 208 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 209 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 210 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 211 | Himco Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 212 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 213 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Sep 2025 |
| 214 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 215 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Aug 2025 |
| 216 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 217 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 218 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 219 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Dec 2025 |
| 220 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2025 |
| 221 | Hughes Gas Systems LLC | Dallas, TX 75214 | Oil & Gas Operator | Aug 2025 |
| 222 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 223 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 224 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Sep 2025 |
| 225 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 226 | J & T Operating Inc | Norman, OK 73070-1736 | Oil & Gas Operator | Feb 2012 |
| 227 | J O C Operating Inc | Fort Worth, TX 76102-6823 | Oil & Gas Operator | Feb 2021 |
| 228 | J3 Energy | Purcell, OK 73080 | Oil & Gas Operator | Sep 2003 |
| 229 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 230 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Sep 2025 |
| 231 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 232 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Aug 2025 |
| 233 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2025 |
| 234 | Jones Energy, LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2025 |
| 235 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 236 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Sep 2025 |
| 237 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 238 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 239 | Kaneb Operating Company | Dallas, TX 75265-0283 | Oil & Gas Operator | Dec 1995 |
| 240 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 241 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 242 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 243 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 244 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 245 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Sep 2025 |
| 246 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 247 | L.E. Jones Operating, Inc. | Duncan, OK 73534 | Oil & Gas Operator | Sep 2025 |
| 248 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 249 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Aug 2025 |
| 250 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 251 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Dec 2025 |
| 252 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2025 |
| 253 | Lambdin William H | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 1998 |
| 254 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Sep 2025 |
| 255 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2025 |
| 256 | Larkspur Operating LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Aug 2025 |
| 257 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 258 | Laurco Energies,Inc | | Oil & Gas Operator | May 2025 |
| 259 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Aug 2025 |
| 260 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 261 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 262 | London William W Inc | Oklahoma City, OK 73116-5116 | Oil & Gas Operator | Apr 2016 |
| 263 | Long Engineering Company Inc | Oklahoma City, OK 73112-7769 | Oil Operator | Jun 2008 |
| 264 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Aug 2025 |
| 265 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 266 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Sep 2025 |
| 267 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Dec 2025 |
| 268 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Sep 2025 |
| 269 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 270 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Aug 2025 |
| 271 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 272 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Sep 2025 |
| 273 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2025 |
| 274 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Aug 2025 |
| 275 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 276 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 277 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 278 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 279 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Sep 2025 |
| 280 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 281 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Sep 2025 |
| 282 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 283 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 284 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 285 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 286 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 287 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 288 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Aug 2025 |
| 289 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 290 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Aug 2025 |
| 291 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Sep 2025 |
| 292 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 293 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Dec 2025 |
| 294 | Mullins Jimmy R Dba Southcreek Petroleum Co | Dibble, OK 73031 | Oil & Gas Operator | Jan 2021 |
| 295 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 296 | National Cooperative RFG Assoc | McPherson, KS 67460-1404 | Oil & Gas Operator | Jun 2006 |
| 297 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 298 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 299 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 300 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |