| 201 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 202 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 203 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | May 2025 |
| 204 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 205 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 206 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 207 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 208 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 209 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 210 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Apr 2025 |
| 211 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 212 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 213 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 214 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 215 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 216 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 217 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 218 | Hills Dozer Service | Stroud, OK 74079 | Oil & Gas Operator | Mar 2022 |
| 219 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 220 | Hilltop Disposal LLC | Elk City, OK 73644-2400 | Oil Operator | Jun 2021 |
| 221 | Himco Oil & Gas, Inc. | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 222 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 223 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | May 2025 |
| 224 | Hinson Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Mar 2025 |
| 225 | Hinson Jr Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jul 2020 |
| 226 | His Energy Corporation Inc | Newcastle, OK 73065-1461 | Oil Operator | Feb 2018 |
| 227 | Hispanic Oil & Gas Energy, LLC | Houston, TX 77056 | Oil Operator | Apr 2025 |
| 228 | Hitchita #1 LP | Edmond, OK 73013-6628 | Oil & Gas Operator | Sep 1997 |
| 229 | Hixon James E | | Oil Operator | Feb 2004 |
| 230 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 231 | HLH Realty Co | Drumright, OK 74030 | Oil & Gas Operator | Mar 2016 |
| 232 | HMD Oil Co Inc | Ardmore, OK 73401-2542 | Oil & Gas Operator | May 2025 |
| 233 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Apr 2025 |
| 234 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 235 | Hobo Oil & Gas | | Oil & Gas Operator | Aug 2013 |
| 236 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 237 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2025 |
| 238 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 239 | Hoehn French | Enid, OK 73701-5600 | Oil & Gas Operator | Oct 1996 |
| 240 | Hoffman Oil & Gas Company | | Oil & Gas Operator | Aug 1997 |
| 241 | Hog Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 242 | Hogback Exploration Inc | Fort Smith, AR 72916 | Oil & Gas Operator | Apr 2025 |
| 243 | Hoge Oil & Gas Expl Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Sep 2023 |
| 244 | Hoke Jr J T | Edmond, OK 73034 | Oil Operator | Nov 1998 |
| 245 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 246 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Apr 2025 |
| 247 | Holliday Exploration Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2005 |
| 248 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Apr 2025 |
| 249 | Hollrah Exploration Company | Edmond, OK 73012 | Oil & Gas Operator | May 2025 |
| 250 | Holman Kendall | Paden, OK 74860-7116 | Oil & Gas Operator | Jan 2025 |
| 251 | Holman Ray | Okemah, OK 74859-0029 | Gas Operator | May 2024 |
| 252 | Holman Robert W | Prague, OK 74864-9230 | Oil & Gas Operator | Jan 2019 |
| 253 | Holmes Mary Ellen | Bristow, OK 74010 | Oil Operator | Mar 2015 |
| 254 | Holt Andrew L "Mickey" | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2008 |
| 255 | Holt James | Skiatook, OK 74070-0006 | Oil & Gas Operator | Feb 2020 |
| 256 | Holt Jean | Claremore, OK 74017-9439 | Oil Operator | Mar 2015 |
| 257 | Holt Oil & Gas Corp | Dallas, TX 75231 | Oil & Gas Operator | Apr 1995 |
| 258 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Jul 2025 |
| 259 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 260 | Homer Oil Co LLC | Holdenville, OK 74848-3232 | Oil Operator | May 2025 |
| 261 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 262 | Honeymon Drilling Company LTD | Oklahoma City, OK 73147 | Oil & Gas Operator | Feb 1995 |
| 263 | Hooker Phil Oil Operator | | Oil Operator | Aug 1996 |
| 264 | Hooks Dwain | Tatums, OK 73487 | Oil & Gas Operator | Apr 2025 |
| 265 | Hoover & Wilson Exp & Prod Inc | Fort Smith, AR 72913-5171 | Gas Operator | Jul 2013 |
| 266 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 267 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 268 | Horizon Barnsdall Energy Part LTD I Osage Only | | Oil Operator | Feb 2012 |
| 269 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 270 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 271 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 272 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 273 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | Feb 2025 |
| 274 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Apr 2025 |
| 275 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 276 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 277 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 278 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 279 | Horton Oil Company, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 280 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 281 | Hotulke Construction LLC | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 282 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Apr 2025 |
| 283 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 284 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 285 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 286 | Howard & Taylor | Wynnewood, OK 73098-9234 | Oil & Gas Operator | May 2025 |
| 287 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 288 | Howden Petroleum Corp | Wetumka, OK 74883 | Gas Operator | Nov 1997 |
| 289 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 290 | Howell C W | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2015 |
| 291 | Howell'S Well Service, Inc. | | Oil & Gas Operator | Apr 2025 |
| 292 | Hoyt John C | Bartlesville, OK 74005-1316 | Oil Operator | Feb 2000 |
| 293 | Hoyt Oil & Gas LLC | Cushing, OK 74023-0442 | Oil & Gas Operator | Apr 2025 |
| 294 | HP Operating LLC | Seminole, OK 74868 | Oil Operator | May 2025 |
| 295 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 296 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2025 |
| 297 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 298 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Jul 2025 |
| 299 | Hsumy Oil & Gas Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 300 | Hub-Hill Inc | San Antonio, TX 78230 | Oil Operator | Nov 1998 |