| 4201 | Outback Petroleum Inc | Moore, OK 73160-9998 | Oil & Gas Operator | Mar 2015 |
| 4202 | Ovation Energy II, LP | Houston, TX 77279 | Oil & Gas Operator | Jun 2011 |
| 4203 | Ovation Energy, LP | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Sep 2004 |
| 4204 | Overflow Energy Stack LLC | Booker, TX 79005 | Oil Operator | Sep 2022 |
| 4205 | Overflow Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | May 2026 |
| 4206 | Overland Investments Inc | Coweta, OK 74429 | Oil & Gas Operator | Jan 2026 |
| 4207 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Feb 2026 |
| 4208 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 4209 | Owens James W | Tulsa, OK 74114-1425 | Oil & Gas Operator | Oct 2022 |
| 4210 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 4211 | Oxco, LLC | | Oil & Gas Operator | Feb 2015 |
| 4212 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 4213 | Oxford Oil Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 1997 |
| 4214 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Jan 2026 |
| 4215 | Oxley John C | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1996 |
| 4216 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 4217 | Oxley Petroleum Company | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 4218 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2026 |
| 4219 | Ozark Oil Corporation | Springfield, MO 65804 | Oil & Gas Operator | Oct 1992 |
| 4220 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Mar 2026 |
| 4221 | P & H Construction Inc | Wewoka, OK 74884 | Oil & Gas Operator | Jun 2024 |
| 4222 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | Feb 2026 |
| 4223 | P & M Drilling Company Inc | Depew, OK 74028 | Oil & Gas Operator | Dec 2004 |
| 4224 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 4225 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 4226 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 4227 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | Jan 2026 |
| 4228 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 4229 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 4230 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 4231 | P-2 Exploraton Co Inc | Pampa, TX 79065-2920 | Oil & Gas Operator | Jun 1996 |
| 4232 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 4233 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Jan 2026 |
| 4234 | Pace Exploration LLC | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2025 |
| 4235 | Pace Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | May 2026 |
| 4236 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 4237 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4238 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 4239 | Page Petroleum Inc | Calgary, AB T2P3M-3000 | Oil & Gas Operator | Nov 1998 |
| 4240 | Painter & McPhail | Bartlesville, OK 74006 | Oil Operator | Sep 1996 |
| 4241 | Pak Energy LLC | Calgary, AB T3A-5E8 | Oil Operator | Sep 2022 |
| 4242 | Pal Energy LLC | Guymon, OK 73942-1950 | Gas Operator | Aug 2009 |
| 4243 | Pal Kids Inc | Coronado, CA 92118 | Oil & Gas Operator | Nov 2000 |
| 4244 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 4245 | Paleo, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2026 |
| 4246 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 4247 | Palm Oil & Gas Company | Sedona, AZ 86340 | Oil & Gas Operator | Feb 2026 |
| 4248 | Palm Operating LLC | Oklahoma City, OK 73106-5646 | Oil & Gas Operator | Nov 2019 |
| 4249 | Paloma Operating Co Inc | Houston, TX 77002-5220 | Oil & Gas Operator | Feb 2026 |
| 4250 | Paloma Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2018 |
| 4251 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Jan 2026 |
| 4252 | Paluca Petroleum Inc | Holdenville, OK 74848 | Oil & Gas Operator | Feb 2026 |
| 4253 | Pan Petroleum MLP | Kansas City, MO 64114 | Oil & Gas Operator | Aug 1997 |
| 4254 | Pan Texas Petroleum Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2003 |
| 4255 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | May 2026 |
| 4256 | Panada Exploration, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1996 |
| 4257 | Panadero Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2002 |
| 4258 | Panenergy Services Inc | Houston, TX 77525 | Oil & Gas Operator | May 2001 |
| 4259 | Panexco Operating LLC | Oklahoma City, OK 73103-2203 | Oil & Gas Operator | Oct 2014 |
| 4260 | Pangaea Exploration Corp | Edmond, OK 73013 | Oil & Gas Operator | May 2019 |
| 4261 | Panhandle Eastern Pipeline Company LP | Houston, TX 77002-6803 | Oil & Gas Operator | Oct 1999 |
| 4262 | Panhandle Oil & Gas Consultants Inc | Woodward, OK 73802-5011 | Oil & Gas Operator | Jul 2015 |
| 4263 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 4264 | Panhandle Oilfield Service Companies Inc | Liberal, KS 67905-1256 | Oil Operator | Sep 2000 |
| 4265 | Panoak Oil & Gas Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Aug 2018 |
| 4266 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2026 |
| 4267 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 4268 | Panther Operating LLC | Pauls Valley, OK 73075 | Oil & Gas Operator | Jan 2026 |
| 4269 | Pap Oil Company Inc | Cement, OK 73017-0240 | Oil & Gas Operator | Nov 1998 |
| 4270 | Papal Enterprises Inc | Oklahoma City, OK 73154-1555 | Oil & Gas Operator | Apr 2015 |
| 4271 | Pappe Court Jr | Kingfisher, OK 73750-0688 | Oil & Gas Operator | Nov 2001 |
| 4272 | Par Oil Company Inc | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 4273 | Para Pro Corporation | Sedona, AZ 86336-5745 | Oil & Gas Operator | Jan 2005 |
| 4274 | Paradigm Petroleum Corporation | Abilene, TX 79605 | Oil & Gas Operator | May 2026 |
| 4275 | Paradigm Twenty LLC | Stillwater, OK 74074-1745 | Oil & Gas Operator | Jan 2026 |
| 4276 | Paradox Petroleum Company | Amarillo, TX 79114-7587 | Oil & Gas Operator | Dec 1998 |
| 4277 | Paragon Industries Inc | Sapulpa, OK 74066-6987 | Oil Operator | Feb 2026 |
| 4278 | Paragon Production Company | Edmond, OK 73013-5051 | Oil & Gas Operator | Feb 2021 |
| 4279 | Paramore Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Apr 2022 |
| 4280 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 4281 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 4282 | Parham Edith | Beggs, OK 74421-2436 | Oil Operator | Oct 2025 |
| 4283 | Parish Petroleum Company | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2025 |
| 4284 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 4285 | Park Kenneth Y | Skiatook, OK 74070-6060 | Oil & Gas Operator | Feb 2026 |
| 4286 | Park William M | Sperry, OK 74073 | Oil & Gas Operator | Feb 2026 |
| 4287 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 4288 | Parker & Parsley Dev LP | Irving, TX 75039-3745 | Oil & Gas Operator | Mar 2015 |
| 4289 | Parker James A | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2026 |
| 4290 | Parker Joe | Talala, OK 74080-3556 | Oil & Gas Operator | Dec 2012 |
| 4291 | Parker Shirley M | Tulsa, OK 74136 | Oil Operator | Jun 2013 |
| 4292 | Parkinsol Oil Company | Seminole, OK 74868-1648 | Oil & Gas Operator | Oct 2014 |
| 4293 | Parks Bill M | Seminole, OK 74818-1648 | Oil & Gas Operator | Apr 2014 |
| 4294 | Parks Jack Concrete Co | Hominy, OK 74035 | Oil Operator | Aug 2025 |
| 4295 | Parks James L | Edmond, OK 73034 | Oil & Gas Operator | Aug 2005 |
| 4296 | Parks Tex M Trust | Dallas, TX 75220-3864 | Oil Operator | Aug 2017 |
| 4297 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 4298 | Parrish Jr W F | Ardmore, OK 73401-2941 | Oil & Gas Operator | Feb 2025 |
| 4299 | Parsage Oil Company, L.L.C. | | Oil & Gas Operator | Feb 2026 |
| 4300 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |