| 1 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 2 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | Apr 2024 |
| 3 | Padon, Frank B. Oil Oper., Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1998 |
| 4 | Paisano Minerals Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 2003 |
| 5 | Paleo Oil Company LLC | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 2024 |
| 6 | Palmer Petroleum Inc. | Shreveport, LA 71106 | Oil & Gas Operator | Apr 2024 |
| 7 | Paloma Operating, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 8 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 9 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 10 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 11 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 12 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 13 | Patterson, Ben M., Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2003 |
| 14 | Payrock II, LLC | Houston, TX 77007 | Oil & Gas Operator | Dec 2020 |
| 15 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Apr 2024 |
| 16 | Pedeco, Inc. | Casper, WY 82601 | Oil & Gas Operator | Mar 2008 |
| 17 | Pegasus Operating, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | Apr 2024 |
| 18 | Pentad Development Corp. (A) | Dallas, TX 75201 | Oil & Gas Operator | Mar 1993 |
| 19 | Perdido Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Apr 2024 |
| 20 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 21 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2023 |
| 22 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 23 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 24 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 25 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 1998 |
| 26 | Petroleum Production Engineering | Fulton, TX 78358 | Oil Operator | Feb 2019 |
| 27 | Petrotx Operating, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2024 |
| 28 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 29 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 30 | Phoenix Fund, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2000 |
| 31 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 32 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2024 |
| 33 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Jan 2024 |
| 34 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 35 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 36 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 37 | Placer Oil Co. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2008 |
| 38 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 39 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 40 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 41 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 42 | Portal Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Mar 1993 |
| 43 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2024 |
| 44 | Premier Operating Company | Tulsa, OK 74153 | Gas Operator | Nov 1996 |
| 45 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Apr 2024 |
| 46 | Primera Energy, LLC | Longview, TX 75606 | Oil & Gas Operator | Mar 2016 |
| 47 | Principal Oil Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2002 |
| 48 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 49 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Apr 2024 |
| 50 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 51 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 52 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |