| 201 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 202 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 203 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 204 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 205 | Howell C W | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2015 |
| 206 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 207 | Ignis Energy LLC | Blackwell, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 208 | Ike Energy LLC | Stillwater, OK 74074-1745 | Oil & Gas Operator | Apr 2025 |
| 209 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 210 | Inland Oil Corporation | Sapulpa, OK 74066 | Oil & Gas Operator | Jan 2025 |
| 211 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Apr 2025 |
| 212 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 213 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | May 2025 |
| 214 | Investment Operating Co | Stillwater, OK 74075-8572 | Oil Operator | May 2025 |
| 215 | Iron Hawk Energy Group Joint Venture | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 216 | J B Tank Trucks Inc | Blackwell, OK 74631-0464 | Oil Operator | Apr 2014 |
| 217 | J O C Operating Inc | Fort Worth, TX 76102-6823 | Oil & Gas Operator | Feb 2021 |
| 218 | Jaed Oil Production Co Inc | Arkansas City, KS 67005-0902 | Oil & Gas Operator | Mar 2015 |
| 219 | Jeffries Keith E Dba Lady Bug Oil Company | Blackwell, OK 74631-0389 | Oil & Gas Operator | Mar 2019 |
| 220 | Jeffries Pumping Service Inc | Guthrie, OK 73044-8761 | Oil & Gas Operator | Apr 2025 |
| 221 | Jenkins & Sons Production, Inc. | Arkansas City, KS 67005 | Oil Operator | Jul 2014 |
| 222 | Jenkins Charles L | Edmond, OK 73083-3610 | Oil Operator | Jul 1996 |
| 223 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | May 2025 |
| 224 | Jewell Consulting Inc | Bixby, OK 74008 | Oil & Gas Operator | Dec 2022 |
| 225 | Johns Daryl W | Newkirk, OK 74647-9136 | Oil Operator | Feb 2025 |
| 226 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 227 | Jones Oil Company LLC (The) | Duncan, OK 73533-4995 | Oil & Gas Operator | Mar 2025 |
| 228 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 229 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 230 | K3 Oil & Gas Operating Company | Spring, TX 77383 | Oil & Gas Operator | Apr 2025 |
| 231 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 232 | Kalkman Oil Corporation | Duncan, OK 73533 | Oil & Gas Operator | Apr 2025 |
| 233 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Apr 2025 |
| 234 | Kansas Gas Purchasing | Salina, KS 67401 | Oil & Gas Operator | May 1995 |
| 235 | Kay County Properties | Tulsa, OK 74145 | Oil & Gas Operator | May 1997 |
| 236 | Kay Production Company Inc | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 237 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 238 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 239 | Kelle Day Oil Producers Inc | Braman, OK 74632-9147 | Oil & Gas Operator | Dec 2023 |
| 240 | Kelle Lambing Production Co | Braman, OK 74632-0132 | Oil & Gas Operator | Nov 2014 |
| 241 | Kelly Jr Walter A Opr Co | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 242 | Kelmac Production Company | Braman, OK 74632-0132 | Oil Operator | Apr 2003 |
| 243 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 244 | Kingman Petroleum Inc | Dolores, CO 81323-9503 | Oil & Gas Operator | Feb 2025 |
| 245 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 246 | Kirkpatrick W E | Ponca City, OK 74604-4146 | Gas Operator | Oct 2001 |
| 247 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 248 | Kivett Kenneth W | Blackwell, OK 74631-0134 | Oil & Gas Operator | Jun 2001 |
| 249 | Klinger Energy Inc | Ponca City, OK 74601-7812 | Oil & Gas Operator | Oct 2019 |
| 250 | Klinger Shirley | Ponca City, OK 74601-7812 | Oil & Gas Operator | Apr 2025 |
| 251 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | May 2025 |
| 252 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 253 | Koda Operating LLC | Tyler, TX 75703-5596 | Oil & Gas Operator | Apr 2025 |
| 254 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Apr 2025 |
| 255 | KT Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 256 | L & B Oil Company Inc | Houston, TX 77019-3115 | Oil & Gas Operator | Mar 2025 |
| 257 | L & L Smith Energy Corporation | Muskogee, OK 74403-8479 | Oil & Gas Operator | Jan 2023 |
| 258 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2025 |
| 259 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 260 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2025 |
| 261 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | May 2025 |
| 262 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 263 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 264 | Lar-Mie Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1998 |
| 265 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Jan 2025 |
| 266 | Law E Edward | Newkirk, OK 74647-2056 | Oil Operator | Mar 2025 |
| 267 | Lawco Exploration Inc | Bentonville, AR 72712 | Oil & Gas Operator | Aug 2024 |
| 268 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Apr 2025 |
| 269 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | May 2025 |
| 270 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 271 | Leake Keith D | Winfield, KS 67156-8871 | Oil Operator | Apr 2004 |
| 272 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 273 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 274 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Apr 2025 |
| 275 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 276 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2025 |
| 277 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 278 | Little Bear Resources LLC | Stillwater, OK 74074-1388 | Oil & Gas Operator | Feb 2013 |
| 279 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 280 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 281 | M & S Operating LLC | Oklahoma City, OK 73112 | Oil Operator | Mar 1999 |
| 282 | M J M D Inc | Burlington, IA 52601 | Oil Operator | Jan 2013 |
| 283 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Apr 2025 |
| 284 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 285 | M-P Petroleum Inc | McPherson, KS 67460 | Oil & Gas Operator | Jan 2013 |
| 286 | Mackey Consulting & Leasing LLC | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2025 |
| 287 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 288 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 289 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Apr 2025 |
| 290 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 291 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 292 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 293 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 294 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Apr 2025 |
| 295 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 296 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 297 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 298 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Apr 2025 |
| 299 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 300 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Apr 2025 |