| 21201 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 21202 | Owl Creek Production Co., LLC | Denver, CO 80265 | Oil & Gas Operator | Jan 2006 |
| 21203 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 21204 | Owl Ops II LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 21205 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 21206 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 21207 | Ows Acquisition Co LLC | Louisville, OH 44641 | Oil & Gas Operator | Dec 2023 |
| 21208 | Ows Energy LLC | Carlton, PA 16311-1605 | Oil & Gas Operator | Sep 2024 |
| 21209 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Nov 2024 |
| 21210 | Oxbow Oil Company,A Kansas General Partnership | Grenola, KS 67346 | Oil Operator | Apr 2015 |
| 21211 | Oxbow Petroleum, LLC | Midland, TX 79703 | Oil & Gas Operator | Nov 2024 |
| 21212 | Oxbow Properties Inc | Centennial, CO 80122-1422 | Oil & Gas Operator | Sep 2024 |
| 21213 | Oxco LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Feb 2015 |
| 21214 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Nov 2024 |
| 21215 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 21216 | Oxford Exploration | | Oil Operator | Apr 1988 |
| 21217 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 21218 | Oxford Oil | Zanesville, OH 43702-0910-0910 | Oil & Gas Operator | Dec 2012 |
| 21219 | Oxford Oil Co. | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2004 |
| 21220 | Oxford Oil Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 1997 |
| 21221 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Sep 2024 |
| 21222 | Oxley John C | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1996 |
| 21223 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 21224 | Oxley Petroleum Company | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 21225 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Nov 2024 |
| 21226 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 21227 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 21228 | Oxy Little Knife, LLC | | Oil & Gas Operator | Jan 2016 |
| 21229 | Oxy Long Beach, Inc. | | Oil & Gas Operator | Dec 2014 |
| 21230 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 21231 | Oxy USA | | Oil Operator | Apr 1992 |
| 21232 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 21233 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | Sep 2024 |
| 21234 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 21235 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 21236 | Oz Gas Corporation | Austin, TX 78746 | Gas Operator | Nov 2024 |
| 21237 | Oz Gas LTD | Tidioute, PA 16351-2648 | Oil & Gas Operator | Dec 2016 |
| 21238 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 21239 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2024 |
| 21240 | Ozark Oil & Gas, Inc | | Gas Operator | May 2018 |
| 21241 | Ozark Oil Corporation | Springfield, MO 65804 | Oil & Gas Operator | Oct 1992 |
| 21242 | Ozark Production Company, Inc. | | Oil & Gas Operator | Jul 2024 |
| 21243 | Oztx Oil & Gas, L.L.C. | Ozona, TX 76943 | Oil & Gas Operator | Nov 2024 |
| 21244 | Ozzo Corporation, The | Bedford, TX 76021 | Oil Operator | Nov 2024 |
| 21245 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 21246 | P & A Operating, Inc. | Houston, TX 77095 | Oil & Gas Operator | Nov 2024 |
| 21247 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 21248 | P & C Energy Co | Allegany, NY 14706-9615 | Oil Operator | Dec 2015 |
| 21249 | P & C Oil & Gas, Inc. | Linn, WV 26384 | Oil & Gas Operator | Dec 2021 |
| 21250 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Sep 2024 |
| 21251 | P & C Petroleum, LLC | Shawnee, KS 66226 | Oil Operator | Jul 2024 |
| 21252 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 21253 | P & E Oil | | Oil & Gas Operator | Dec 2023 |
| 21254 | P & H Construction Inc | Wewoka, OK 74884 | Oil & Gas Operator | Jun 2024 |
| 21255 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | Sep 2024 |
| 21256 | P & H Vacuum Service | | Oil & Gas Operator | Apr 2024 |
| 21257 | P & J Resources, Inc | | Oil & Gas Operator | Dec 2013 |
| 21258 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 21259 | P & M Drilling Company Inc | Depew, OK 74028 | Oil & Gas Operator | Dec 2004 |
| 21260 | P & M Energy, A General Partnership | Johnson, KS 67855 | Gas Operator | Sep 2003 |
| 21261 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Aug 2024 |
| 21262 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 21263 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 21264 | P & P Petroleum | Midland, TX 79706 | Oil & Gas Operator | Oct 2002 |
| 21265 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 21266 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Nov 2024 |
| 21267 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 21268 | P & S Oil And Gas Corporation | | Gas Operator | Dec 1996 |
| 21269 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 21270 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 21271 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 2024 |
| 21272 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 21273 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 21274 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 21275 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | Sep 2024 |
| 21276 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 21277 | P J Oil Co. | | Oil Operator | Jul 2024 |
| 21278 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 21279 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Sep 2024 |
| 21280 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2023 |
| 21281 | P T C, Inc | Raccoon, KY 41557 | Gas Operator | Dec 2022 |
| 21282 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 21283 | P&B Petroleum LLC | Miami, FL 33166 | Oil & Gas Operator | Nov 2024 |
| 21284 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Nov 2024 |
| 21285 | P&H Gas, LLC | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 21286 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 21287 | P,B&B Operating Inc. | Coleman, TX 76834 | Oil & Gas Operator | Nov 2024 |
| 21288 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 21289 | P-2 Exploraton Co Inc | Pampa, TX 79065-2920 | Oil & Gas Operator | Jun 1996 |
| 21290 | P-2 Oil | Vernal, UT 84078 | Oil & Gas Operator | Jul 2000 |
| 21291 | P-K Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 21292 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Nov 2024 |
| 21293 | P-Tex Petroleum, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Nov 1999 |
| 21294 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 21295 | P. D. L. Services, Inc. | Paris, OH 44669 | Oil & Gas Operator | Dec 2020 |
| 21296 | P. G. Oil & Gas, LLC | Clarksburg, WV 26302-2512 | Oil & Gas Operator | Dec 2021 |
| 21297 | P. K. Smith | | Oil Operator | Mar 1997 |
| 21298 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 21299 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 21300 | P. S. & G., Incorporated | | Gas Operator | Aug 1983 |