| 1 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 2 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 3 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 4 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 5 | Pacific Transmission Supply | | Oil & Gas Operator | Dec 1987 |
| 6 | Pajaro Energy LLC | Santa Fe, NM 87501 | Oil & Gas Operator | Dec 2023 |
| 7 | Pal LLC | Gillette, WY 82718 | Oil Operator | Dec 2019 |
| 8 | Paladin Energy Partner LLC | Denver, CO 80201 | Oil & Gas Operator | Aug 2006 |
| 9 | Palo Petroleum Inc | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 10 | Pancanadian Petroleum Company | | Oil & Gas Operator | Oct 1989 |
| 11 | Panther Energy Company III LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2020 |
| 12 | Paoli Investors LTD | | Oil & Gas Operator | Aug 1985 |
| 13 | Par Oil Company Inc | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 14 | Park Oil Properties LLC | Plano, TX 75025 | Oil Operator | Oct 2019 |
| 15 | Park Robert E | | Oil Operator | May 1983 |
| 16 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 17 | Pathfinder Energy Inc | Casper, WY 82605 | Oil & Gas Operator | May 2024 |
| 18 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 19 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 20 | Patriot Energy Resources LLC | Golden, CO 80401 | Gas Operator | Aug 2014 |
| 21 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 22 | PDS Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 23 | Peabody Natural Gas LLC | Gillette, WY 82718 | Oil & Gas Operator | Oct 2025 |
| 24 | Peak Powder River Resources LLC | Durango, CO 81301 | Oil & Gas Operator | Sep 2025 |
| 25 | Peakview Oil Company LLC | Denver, CO 80202 | Gas Operator | Oct 2025 |
| 26 | Pearce Leonard | Manderson, WY 82432 | Oil Operator | Dec 1999 |
| 27 | Pearce Mary | | Oil Operator | Dec 1999 |
| 28 | Pearce Oil Company | Manderson, WY 82432 | Oil Operator | Jun 1999 |
| 29 | Pease Oil & Gas Company | Grand Junction, CO 81506 | Oil & Gas Operator | May 2000 |
| 30 | Pecos Development Corporation | San Antonio, TX 78209 | Oil Operator | Aug 1988 |
| 31 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 32 | Pedry J J | | Oil Operator | Sep 1989 |
| 33 | Pelican Dome Exploration | Harahan, LA 70123 | Oil & Gas Operator | Jun 1997 |
| 34 | Pendragon Energy Partners Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2009 |
| 35 | Pennaco Energy Incorporated | Gillette, WY 82718 | Oil & Gas Operator | Feb 2021 |
| 36 | Penneco Exploration Company Of Wyo LLC | Delmont, PA 15626 | Oil Operator | Aug 2021 |
| 37 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 38 | Petcon Associates LTD | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 39 | Peters Walter J | | Oil & Gas Operator | Jul 1991 |
| 40 | Peterson Energy Management Inc | | Oil Operator | Aug 2010 |
| 41 | Peterson Energy Operating Inc | Loveland, CO 80537 | Oil & Gas Operator | Oct 2025 |
| 42 | Petra Petroleum Inc | Littleton, CO 80160-0319 | Oil & Gas Operator | Jun 2005 |
| 43 | Petral Exploration Inc LLC | Denver, CO 80217 | Oil & Gas Operator | May 2007 |
| 44 | Petro Energy Inc | Farmington, NM 87499 | Oil & Gas Operator | Jul 2025 |
| 45 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 46 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 47 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 48 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 49 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 50 | Petrocarbon Energy Corporation | | Oil Operator | Sep 1996 |
| 51 | Petrocarbon Energy Trust | | Oil Operator | Sep 1996 |
| 52 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 53 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 54 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 55 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 1998 |
| 56 | Petroleum Corp Of Delaware The | | Oil & Gas Operator | May 1991 |
| 57 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 58 | Petroleum Management LLC | Platteville, CO 80651 | Oil & Gas Operator | Mar 2011 |
| 59 | Petroleum Products Inc | | Oil Operator | Jun 1996 |
| 60 | Petroleum Resource Management Corp | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 61 | Petrorep Inc | | Oil Operator | Oct 1998 |
| 62 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Oct 2025 |
| 63 | PGC LLC | Newcastle, WY 92701 | Oil Operator | Oct 2023 |
| 64 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 65 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | Oct 2025 |
| 66 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 67 | Phoenix Resources Co | | Oil & Gas Operator | Jun 1984 |
| 68 | Pine Haven Resources LLC | Boulder, CO 80305 | Oil Operator | Oct 2025 |
| 69 | Pine Ridge Petroleum LLC | Moorcroft, WY 82721 | Oil Operator | Oct 2025 |
| 70 | Pinedale Energy Partners Operating LLC | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2021 |
| 71 | Pinedale Investment Inc | Pinedale, WY 82941 | Oil & Gas Operator | Oct 2025 |
| 72 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 73 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 74 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 75 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 76 | Pivonka Investments LLC | | Oil & Gas Operator | Oct 2025 |
| 77 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 78 | Planet Associates Inc | Denver, CO 80218 | Oil Operator | Dec 1994 |
| 79 | PML Operating LLC | | Oil Operator | Oct 2025 |
| 80 | Poc-I LLC | Casper, WY 82605 | Oil & Gas Operator | Oct 2025 |
| 81 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 82 | Polfam Exploration Co | Denver, CO 80204 | Oil & Gas Operator | Mar 2007 |
| 83 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 84 | Powder Battalion Holdings LLC | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 85 | Powder River Oil | Golden, CO 80401 | Oil & Gas Operator | Sep 2018 |
| 86 | Powder River Petroleum | Boerne, TX 78006 | Oil & Gas Operator | Dec 1998 |
| 87 | Powder River Royalty Inc | | Oil & Gas Operator | Dec 1986 |
| 88 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Dec 2025 |
| 89 | PRB Oil & Gas Inc | Denver, CO 80202 | Gas Operator | Jul 2008 |
| 90 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 91 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 92 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2025 |
| 93 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 94 | Primary Fuels Inc | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 95 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 96 | Principle Petroleum LLC | Dallas, TX 75313 | Oil Operator | May 2025 |
| 97 | Propel Energy Company | | Oil Operator | Oct 1991 |
| 98 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 99 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 100 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |