| 21401 | Oxbow Petroleum, LLC | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 21402 | Oxbow Properties Inc | Centennial, CO 80122-1422 | Oil & Gas Operator | Jan 2025 |
| 21403 | Oxco, LLC | | Oil & Gas Operator | Feb 2015 |
| 21404 | Oxenergy Incorporated | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2025 |
| 21405 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 21406 | Oxford Exploration | | Oil Operator | Apr 1988 |
| 21407 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 21408 | Oxford Oil | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2012 |
| 21409 | Oxford Oil Co. | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2004 |
| 21410 | Oxford Oil Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 1997 |
| 21411 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Apr 2025 |
| 21412 | Oxley John C | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1996 |
| 21413 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 21414 | Oxley Petroleum Co | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 21415 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Jul 2025 |
| 21416 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 21417 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 21418 | Oxy Little Knife, LLC | | Oil & Gas Operator | Jan 2016 |
| 21419 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 21420 | Oxy USA | | Oil Operator | Apr 1992 |
| 21421 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 21422 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | May 2025 |
| 21423 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 21424 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 21425 | Oz Gas Corporation | Austin, TX 78746 | Gas Operator | Jul 2025 |
| 21426 | Oz Gas LTD | Tidioute, PA 16351-2648 | Oil & Gas Operator | Dec 2016 |
| 21427 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 21428 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 21429 | Ozark Oil Corporation | Springfield, MO 65804 | Oil & Gas Operator | Oct 1992 |
| 21430 | Ozark Production Company, Inc. | | Oil & Gas Operator | Jan 2025 |
| 21431 | Oztx Oil & Gas, L.L.C. | Ozona, TX 76943 | Oil & Gas Operator | Jul 2025 |
| 21432 | Ozzo Corporation, The | Bedford, TX 76021 | Oil Operator | Jul 2025 |
| 21433 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 21434 | P & A Operating, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2025 |
| 21435 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 21436 | P & C Energy Co | Allegany, NY 14706-9615 | Oil Operator | Dec 2015 |
| 21437 | P & C Oil & Gas, Inc. | Linn, WV 26384 | Oil & Gas Operator | Dec 2021 |
| 21438 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | May 2025 |
| 21439 | P & C Petroleum, LLC | Shawnee, KS 66226 | Oil Operator | Jan 2025 |
| 21440 | P & D Valentine Oil Co | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2018 |
| 21441 | P & E Oil | | Oil & Gas Operator | Dec 2024 |
| 21442 | P & H Construction Inc | Wewoka, OK 74884 | Oil & Gas Operator | Jun 2024 |
| 21443 | P & H Oil & Gas Inc | Stroud, OK 74079 | Oil & Gas Operator | May 2025 |
| 21444 | P & H Vacuum Service | | Oil & Gas Operator | Dec 2024 |
| 21445 | P & J Resources, Inc | | Oil & Gas Operator | Dec 2013 |
| 21446 | P & M Construction | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 21447 | P & M Drilling Company Inc | Depew, OK 74028 | Oil & Gas Operator | Dec 2004 |
| 21448 | P & M Energy, A General Partnership | Johnson, KS 67855 | Gas Operator | Sep 2003 |
| 21449 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Apr 2025 |
| 21450 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 21451 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 21452 | P & P Petroleum | Midland, TX 79706 | Oil & Gas Operator | Oct 2002 |
| 21453 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 21454 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Jul 2025 |
| 21455 | P & S Energy Inc | Mineral Ridge, OH 44440 | Oil & Gas Operator | Dec 2019 |
| 21456 | P & S Oil And Gas Corporation | | Gas Operator | Dec 1996 |
| 21457 | P & S Production LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2013 |
| 21458 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 21459 | P & W Well Service Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 21460 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 21461 | P A Energy Inc | Calvin, OK 74531-0248 | Oil & Gas Operator | Apr 2020 |
| 21462 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 21463 | P F Beeler LLC | Norman, OK 73072-7522 | Oil & Gas Operator | May 2025 |
| 21464 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 21465 | P J Oil Co. | | Oil Operator | Mar 2025 |
| 21466 | P K & L Oil Properties | Shawnee, OK 74802-0931 | Oil & Gas Operator | Mar 2001 |
| 21467 | P O & G Panhandle LP | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 21468 | P P & G Oil | Pickerington, OH 43147 | Oil & Gas Operator | Dec 2023 |
| 21469 | P T C, Inc | Raccoon, KY 41557 | Gas Operator | Dec 2023 |
| 21470 | P T Oil Co Inc | Walters, OK 73572-9505 | Oil Operator | Nov 2014 |
| 21471 | P&B Petroleum LLC | Miami, FL 33166 | Oil & Gas Operator | Jul 2025 |
| 21472 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Jul 2025 |
| 21473 | P&H Gas, LLC | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 21474 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 21475 | P,B&B Operating Inc. | Coleman, TX 76834 | Oil & Gas Operator | Jul 2025 |
| 21476 | P-2 Exploration Co. | Amarillo, TX 79124 | Oil & Gas Operator | Feb 2005 |
| 21477 | P-2 Exploraton Co Inc | Pampa, TX 79065-2920 | Oil & Gas Operator | Jun 1996 |
| 21478 | P-2 Oil | Vernal, UT 84078 | Oil & Gas Operator | Jul 2000 |
| 21479 | P-K Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 21480 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 21481 | P-Tex Petroleum, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Nov 1999 |
| 21482 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 21483 | P. D. L. Services, Inc. | Minerva, OH 44657 | Oil & Gas Operator | Dec 2024 |
| 21484 | P. G. Oil & Gas, LLC | Clarksburg, WV 26302-2512 | Oil & Gas Operator | Dec 2021 |
| 21485 | P. K. Smith | | Oil Operator | Mar 1997 |
| 21486 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 21487 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 21488 | P. S. & G., Incorporated | | Gas Operator | Aug 1983 |
| 21489 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Jul 2025 |
| 21490 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 21491 | P.D.T. Drilling Limited Partnership | St. Albans, WV 25177 | Gas Operator | Dec 2021 |
| 21492 | P.I.D. Drilling Inc | Clyde, TX 79510 | Oil & Gas Operator | Jul 2025 |
| 21493 | P.M. Petroleum | | Oil Operator | Mar 1998 |
| 21494 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 21495 | P.O.S. Energy, Inc. | Buna, TX 77612 | Oil & Gas Operator | Jul 2025 |
| 21496 | P.R.P., Inc. | | Oil & Gas Operator | May 2025 |
| 21497 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Jul 2025 |
| 21498 | P.T.L. Operating Co. | | Oil Operator | Jun 2003 |
| 21499 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | Jul 2025 |
| 21500 | P3 Production | | Oil Operator | Mar 2025 |