| 201 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 202 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 203 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 204 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2024 |
| 205 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 206 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 207 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 208 | Harter Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2024 |
| 209 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 210 | Heak Operating LLC | | Oil Operator | Jan 2024 |
| 211 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 212 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 213 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 214 | High Energy | Cushing, OK 74023-1762 | Oil & Gas Operator | Jan 2024 |
| 215 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 216 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 217 | Hightower Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 218 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 219 | HLH Realty Inc | Drumright, OK 74030-0232 | Oil & Gas Operator | Mar 2016 |
| 220 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 221 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 222 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 223 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |
| 224 | I C Gas Amcana Inc | Tulsa, OK 74103-3713 | Oil & Gas Operator | Apr 1996 |
| 225 | Icon Energy Company | Oklahoma City, OK 73156-1613 | Oil & Gas Operator | Jan 2024 |
| 226 | Icor Oil & Gas Of Okla LTD | Claremore, OK 74018-2132 | Oil & Gas Operator | Mar 2015 |
| 227 | Imperial Petroleum, Inc. | Evansville, IN 47725 | Oil & Gas Operator | Jan 2005 |
| 228 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 229 | Inland Oil Corporation | Sapulpa, OK 74067-0943 | Oil & Gas Operator | Jan 2024 |
| 230 | International Energy Company LLC | | Oil & Gas Operator | Jan 2024 |
| 231 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 232 | J A Marrs Oil Company Inc | Drumright, OK 74030-1157 | Oil & Gas Operator | Jan 2024 |
| 233 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 234 | James Raymond L | Sapulpa, OK 74066-8785 | Oil & Gas Operator | Jan 2024 |
| 235 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 236 | Jegeroil Corp | New York, NY 10036 | Oil & Gas Operator | Aug 2000 |
| 237 | Jeron Oil And Gas Inc | Denison, TX 75020 | Oil & Gas Operator | Jun 2000 |
| 238 | Jones Raymond H Family Trust | Drumright, OK 74030-1204 | Oil & Gas Operator | Mar 2023 |
| 239 | JP Oil | Cleveland, OK 74020-9664 | Oil Operator | Dec 2023 |
| 240 | K & L Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 241 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2024 |
| 242 | K-C Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jan 2013 |
| 243 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 244 | Kantor Oil Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 245 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 246 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 247 | Keystone Gas Corporation | Drumright, OK 7403O | Oil & Gas Operator | Apr 2015 |
| 248 | Kimraco Oil Inc | Pawnee, OK 74058-2869 | Oil & Gas Operator | Apr 2016 |
| 249 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Feb 2024 |
| 250 | Koby Oil Company LLC | Oklahoma City, OK 73101-1945 | Oil & Gas Operator | Jan 2024 |
| 251 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 252 | Kopco, Inc. | Caney, KS 67333 | Oil & Gas Operator | Jan 2024 |
| 253 | Krotzer Oil Company | Cleveland, OK 74020-0383 | Oil & Gas Operator | Feb 2024 |
| 254 | Krumme Oil Company LLP | Bristow, OK 74010-0749 | Oil & Gas Operator | Jan 2024 |
| 255 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 256 | Kybenco Disposals LLC | | Oil Operator | Sep 2022 |
| 257 | Lake Country Disposal II LLC | | Oil Operator | Jan 2024 |
| 258 | Lake Country Disposal LLC | | Oil Operator | Jan 2024 |
| 259 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 260 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 261 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 262 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 263 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 264 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jan 2024 |
| 265 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 266 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 267 | Lemmons Jack | Cleveland, OK 74020-7023 | Oil Operator | Jan 2015 |
| 268 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 269 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 270 | Lewbet Inc | Perry, OK 73077-8914 | Oil & Gas Operator | Jan 2024 |
| 271 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Mar 2022 |
| 272 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 273 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 274 | Little River Energy Co. | Drumright, OK 74030 | Oil & Gas Operator | Jan 2024 |
| 275 | Lowe Kenneth | Jennings, OK 74038 | Oil & Gas Operator | Feb 2023 |
| 276 | LX4 LLC | | Oil Operator | Jan 2024 |
| 277 | M & M Petroleum Company | Mannford, OK 74044-0462 | Oil Operator | Apr 2020 |
| 278 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 279 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 280 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 281 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 282 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 283 | Major Oil Co LLC | Drumright, OK 74030-0296 | Oil & Gas Operator | Apr 2020 |
| 284 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 285 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jan 2024 |
| 286 | Martin Larry And/Or Sheila Dba Three Stooges Oil | | Oil Operator | Jan 2024 |
| 287 | Martin Tank Truck & Casing Pulling Inc | Cushing, OK 74023-0383 | Oil & Gas Operator | Apr 2015 |
| 288 | Masham Production Corporation | Enid, OK 73702 | Oil & Gas Operator | Aug 2000 |
| 289 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 290 | Meadors Operating Co | | Oil Operator | Jan 2024 |
| 291 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 292 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2024 |
| 293 | Mickalson Petroleum Company | | Oil & Gas Operator | Mar 1993 |
| 294 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 295 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 296 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2024 |
| 297 | Mid-Continent Petroleum Corp | | Oil & Gas Operator | Mar 2017 |
| 298 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 299 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 300 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |