| 21901 | Petro Locators, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 21902 | Petro Mex Resources | | Oil & Gas Operator | Mar 2026 |
| 21903 | Petro Mex, LLC | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 21904 | Petro North LTD | Smethport, PA 16749-0742 | Oil & Gas Operator | Dec 2025 |
| 21905 | Petro Nova | | Oil Operator | Dec 2000 |
| 21906 | Petro Oil Produc | | Oil Operator | Aug 1989 |
| 21907 | Petro Oilfield Equipment Inc | Drumright, OK 74030-1233 | Oil & Gas Operator | Dec 2010 |
| 21908 | Petro Operating Company | | Oil & Gas Operator | Dec 2024 |
| 21909 | Petro Operating Company LLC | | Oil & Gas Operator | Feb 2026 |
| 21910 | Petro Pak Corpor | | Oil Operator | Aug 1988 |
| 21911 | Petro Plex Oil Co Inc. | Homosassa, FL 34448 | Oil & Gas Operator | Jul 2020 |
| 21912 | Petro Producers Corporation | | Oil & Gas Operator | Mar 1993 |
| 21913 | Petro Productions,Petrotec Production,Inc Dba | Wichita, KS 67202 | Oil Operator | Aug 1993 |
| 21914 | Petro Quest Inc | Guysville, OH 45735 | Oil & Gas Operator | Dec 2025 |
| 21915 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | Jun 2026 |
| 21916 | Petro River Operating, LLC | New York City, NY 10017 | Oil & Gas Operator | Jul 2011 |
| 21917 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 21918 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 21919 | Petro SVC Partners Inc | Indiana, PA 15701-8556 | Oil & Gas Operator | Dec 2025 |
| 21920 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 21921 | Petro Vest Operating LLC | | Oil Operator | Aug 2013 |
| 21922 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 21923 | Petro Warrior LLC | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 21924 | Petro-Assets Corporation | | Oil & Gas Operator | Feb 2000 |
| 21925 | Petro-Beth Oil & Gas, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2006 |
| 21926 | Petro-Can, Inc. | | Oil & Gas Operator | Apr 1998 |
| 21927 | Petro-Canada Resources (USA) | | Oil & Gas Operator | Dec 2009 |
| 21928 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 21929 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2026 |
| 21930 | Petro-Flow, Inc | | Gas Operator | Dec 2023 |
| 21931 | Petro-Go, Inc. | | Oil & Gas Operator | Mar 1996 |
| 21932 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 21933 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 21934 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Jun 2026 |
| 21935 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 21936 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Apr 2026 |
| 21937 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 21938 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 21939 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 21940 | Petro-Lud Inc. | | Oil & Gas Operator | Mar 2026 |
| 21941 | Petro-Mac Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2026 |
| 21942 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 21943 | Petro-Management Inc | | Oil Operator | Dec 1998 |
| 21944 | Petro-Mark, Inc. | St Petersburg, FL 33701 | Oil & Gas Operator | Dec 2021 |
| 21945 | Petro-Met Energy LLC | Edmond, OK 73034-1237 | Oil Operator | Mar 2026 |
| 21946 | Petro-Raider LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 21947 | Petro-Search, Inc. | | Oil Operator | Jul 1992 |
| 21948 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2026 |
| 21949 | Petro-Technology | | Oil & Gas Operator | Aug 1991 |
| 21950 | Petro-Tex Energy & Expl.Co.,Inc. | Llano, TX 78643 | Oil & Gas Operator | Jun 2026 |
| 21951 | Petro-Ventures, Inc. - Miss. | | Oil & Gas Operator | Apr 2009 |
| 21952 | Petro-West Corporation | Lubbock, TX 79404 | Oil & Gas Operator | Oct 2001 |
| 21953 | Petro-X Corporation | Houston, TX 77092 | Oil & Gas Operator | Jul 2002 |
| 21954 | Petrobal Omega 1, LLC | Little Elm, TX 75068 | Oil & Gas Operator | Jun 2026 |
| 21955 | Petrobank Opr Co | Denver, CO 80202-4675 | Gas Operator | Dec 1992 |
| 21956 | Petroc Company | Rocky River, OH 44116 | Oil Operator | Dec 2008 |
| 21957 | Petrocana,Inc. | | Oil & Gas Operator | Aug 1993 |
| 21958 | Petrocarbon Energy Corporation | | Oil Operator | Sep 1996 |
| 21959 | Petrocarbon Energy Trust | | Oil Operator | Sep 1996 |
| 21960 | Petrocat Innovations, LLC | Forney, TX 75126 | Oil Operator | Jun 2026 |
| 21961 | Petrocoastal, Inc. | Frisco, TX 75036 | Oil & Gas Operator | Jun 2026 |
| 21962 | Petrocon Inc | Delaware, OH 43015-7147 | Oil & Gas Operator | Dec 2010 |
| 21963 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 21964 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 21965 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 21966 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 21967 | Petroda Oil & Gas LLC | Edmond, OK 73054 | Oil & Gas Operator | Feb 2023 |
| 21968 | Petrodata Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 21969 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 21970 | Petrodril Inc | Farmington, NM 87401 | Oil & Gas Operator | Jan 1987 |
| 21971 | Petroel | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 21972 | Petroflow Energy Corporation | Tulsa, OK 74119-5405 | Oil & Gas Operator | Oct 2016 |
| 21973 | Petrofunds, Inc & Sunny South | | Oil & Gas Operator | Feb 1984 |
| 21974 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 21975 | Petrofunds, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 21976 | Petrogas Energy Services, LLC | Dallas, TX 75214 | Oil Operator | Jun 2026 |
| 21977 | Petrogas Exploration Inc | | Oil Operator | Dec 2025 |
| 21978 | Petrogas Operating Corporation | Garland, TX 75043 | Oil Operator | Feb 2010 |
| 21979 | Petroglen Company, Inc. | | Oil & Gas Operator | Jul 1990 |
| 21980 | Petroglyph Operating Co | Boise, ID 83709 | Oil & Gas Operator | Jul 2017 |
| 21981 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 21982 | Petrohawk Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 21983 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 21984 | Petrohunter Operating Company | | Oil & Gas Operator | Dec 2013 |
| 21985 | Petrol Industries, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Jun 2012 |
| 21986 | Petrol Oil & Gas, Inc. | Overland Park, KS 66210 | Oil & Gas Operator | Dec 2008 |
| 21987 | Petrolanic Inc | Tulsa, OK 74105 | Oil Operator | Oct 1991 |
| 21988 | Petrolegacy Energy II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2023 |
| 21989 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 1998 |
| 21990 | Petrolero, LLC | Plano, TX 75026 | Oil & Gas Operator | Jun 2026 |
| 21991 | Petroleum Advisors Int'L., Inc. | Houston, TX 77224 | Gas Operator | Jun 2005 |
| 21992 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Jun 2026 |
| 21993 | Petroleum Corp Of Delaware The | | Oil & Gas Operator | May 1991 |
| 21994 | Petroleum Corpor | | Oil Operator | Jan 1983 |
| 21995 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 21996 | Petroleum Develo | | Oil Operator | Sep 1986 |
| 21997 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 21998 | Petroleum Development Cor | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2004 |
| 21999 | Petroleum Development Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 22000 | Petroleum Development LLC | | Oil Operator | Jul 2018 |