| 201 | HLH Realty Co | Drumright, OK 74030 | Oil & Gas Operator | Mar 2016 |
| 202 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 203 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 204 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 205 | I C Gas Amcana Inc | Tulsa, OK 74103-3713 | Oil & Gas Operator | Apr 1996 |
| 206 | Icon Energy Company | Oklahoma City, OK 73156-1613 | Oil & Gas Operator | Oct 2025 |
| 207 | Icor Oil & Gas Of Okla LTD | Claremore, OK 74018-2132 | Oil & Gas Operator | Mar 2015 |
| 208 | Imperial Petroleum Inc | Evansville, IN 47725 | Oil & Gas Operator | Jan 2005 |
| 209 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 210 | Inland Oil Corporation | Sapulpa, OK 74067 | Oil & Gas Operator | Oct 2025 |
| 211 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Oct 2025 |
| 212 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 213 | J A Marrs Oil Company Inc | Drumright, OK 74030 | Oil & Gas Operator | Aug 2024 |
| 214 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 215 | James Raymond L | Sapulpa, OK 74066-8785 | Oil & Gas Operator | Oct 2025 |
| 216 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 217 | Jegeroil Corp | New York, NY 10036 | Oil & Gas Operator | Aug 2000 |
| 218 | Jeron Oil And Gas Inc | Denison, TX 75020 | Oil & Gas Operator | Jun 2000 |
| 219 | Jones Bo Enterprises Inc | Tyler, TX 75706 | Oil & Gas Operator | Jan 1994 |
| 220 | Jones Raymond H Family Trust | Drumright, OK 74030-1204 | Oil & Gas Operator | Mar 2023 |
| 221 | JP Oil | Cleveland, OK 74020-9664 | Oil Operator | Jun 2025 |
| 222 | K & L Operating LLC | Cushing, OK 74023-6189 | Oil & Gas Operator | Oct 2025 |
| 223 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Oct 2025 |
| 224 | K-C Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jan 2013 |
| 225 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 226 | Kantor Oil Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2025 |
| 227 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 228 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 229 | Kimraco Oil Inc | Pawnee, OK 74058-2869 | Oil & Gas Operator | Apr 2016 |
| 230 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Oct 2025 |
| 231 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 232 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 233 | Kopco Inc | Caney, KS 67333 | Oil & Gas Operator | Oct 2025 |
| 234 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 235 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Oct 2025 |
| 236 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 237 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 238 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Oct 2025 |
| 239 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 240 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 241 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 242 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 243 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Oct 2025 |
| 244 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 245 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 246 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 247 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 248 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 249 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 250 | Lincoln 77 Inc | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 251 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Sep 2025 |
| 252 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Oct 2025 |
| 253 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Sep 2025 |
| 254 | Lowe Kenneth | Jennings, OK 74038 | Oil & Gas Operator | May 2025 |
| 255 | M & M Petroleum Company | Mannford, OK 74044-0462 | Oil Operator | Apr 2020 |
| 256 | M & M Resources Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 257 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 258 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 259 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 260 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 261 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 262 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Sep 2025 |
| 263 | Martin Larry And/Or Sheila Dba Three Stooges Oil | Pawnee, OK 74058 | Oil Operator | Sep 2025 |
| 264 | Martin Tank Truck & Casing Pulling Inc | Cushing, OK 74023 | Oil & Gas Operator | Apr 2015 |
| 265 | Masham Production Corporation | Enid, OK 73702 | Oil & Gas Operator | Aug 2000 |
| 266 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 267 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Aug 2025 |
| 268 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 269 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 270 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 271 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 272 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 273 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 274 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 275 | Mikal R Brown Oil LLC | Cleveland, OK 74020-6475 | Oil Operator | Dec 2022 |
| 276 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |
| 277 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 278 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 279 | Minor Jr W T | Wichita Falls, TX 76307 | Oil Operator | Nov 1998 |
| 280 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 281 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 282 | Moore Petroleum Invest Corp | Norman, OK 73072-4217 | Oil & Gas Operator | Oct 2025 |
| 283 | Morris Roger Dan | Cushing, OK 74023 | Oil & Gas Operator | Sep 2025 |
| 284 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 285 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 286 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Oct 2025 |
| 287 | Multistates Oil Properties, NV | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 1998 |
| 288 | Musgrove Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 289 | Musgrove Energy Inc | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2025 |
| 290 | Naifco Oil & Gas LLC | Oklahoma City, OK 73107 | Oil & Gas Operator | Oct 2025 |
| 291 | Naro Oil Corporation | Dallas, TX 75230-1986 | Oil & Gas Operator | Nov 2003 |
| 292 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 293 | Natural Gas Compression Corp | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2025 |
| 294 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Dec 2025 |
| 295 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Oct 2025 |
| 296 | New Energy Corporation | Rancho Santa Fe, CA 92067-1990 | Oil & Gas Operator | Jul 2024 |
| 297 | New Gulf Resources, LLC | Tulsa, OK 74133 | Oil & Gas Operator | May 2018 |
| 298 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 299 | Noble Resources Inc | Mannford, OK 74044 | Oil & Gas Operator | Oct 2025 |
| 300 | Noco Investment Company Inc | Tulsa, OK 74159-0470 | Oil & Gas Operator | Mar 2005 |