| 1 | Acadian Gas Pipeline System | | Oil Operator | Jan 2025 |
| 2 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 3 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 4 | Ansythe Exploration Co., Inc. | | Oil & Gas Operator | Oct 1982 |
| 5 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 6 | Artra Resources Corp. | | Oil & Gas Operator | Sep 1990 |
| 7 | Ax Operating, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 8 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 9 | Belco Petroleum Corp | Grand Junction, CO | Oil & Gas Operator | Dec 1983 |
| 10 | Brent Exploration Inc. | | Oil & Gas Operator | Apr 1983 |
| 11 | Britlind Oil LLC | | Oil & Gas Operator | Dec 2020 |
| 12 | Brock Exploration Corporation | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 13 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 14 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 15 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 16 | C & K Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1984 |
| 17 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 18 | Cayman Exploration Corp. | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 19 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 20 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 21 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 22 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 23 | Columbia Gas Dev. Corp. | | Oil & Gas Operator | Apr 1996 |
| 24 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 25 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 26 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 27 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 28 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 29 | Dantex Oil & Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 30 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 31 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 32 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 33 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 34 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 35 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 36 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 37 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 38 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 39 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 40 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 41 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 42 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 43 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 44 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 45 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |
| 46 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 47 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 48 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 49 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 50 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 51 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 52 | Ingo Energy, LLC | | Oil & Gas Operator | Dec 2016 |
| 53 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 54 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 55 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 56 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 57 | Lastrada Oil And Gas LTD | | Oil & Gas Operator | May 1992 |
| 58 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 59 | Lewis Williams | | Oil & Gas Operator | Feb 1991 |
| 60 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 61 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 62 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 63 | Louisiana Resources Co | | Oil Operator | May 1992 |
| 64 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 65 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 66 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 67 | McCarter-Greenbrier-Macdonald | | Oil Operator | Sep 1981 |
| 68 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 69 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 70 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 71 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 72 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 73 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 74 | P & A Oilfield Services, Inc. | | Oil & Gas Operator | Jan 1998 |
| 75 | Patrick Petroleum Corp. | | Oil & Gas Operator | Oct 1984 |
| 76 | Petsec Energy Inc. | | Oil & Gas Operator | Sep 2012 |
| 77 | Reese Energy Corp. | | Oil & Gas Operator | Oct 1991 |
| 78 | Republic Mineral Corporation | | Oil & Gas Operator | Sep 1987 |
| 79 | Robert G Cox & Assoc La Inc. | | Oil & Gas Operator | Jun 1994 |
| 80 | Russell Resources, Inc. | | Oil & Gas Operator | Dec 1998 |
| 81 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 82 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 83 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 84 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 85 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 86 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 87 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 88 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 89 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 90 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jun 2025 |
| 91 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 92 | Trans Ocean Oil, Inc. | | Oil & Gas Operator | Sep 1980 |
| 93 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 94 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 95 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 96 | Triumph Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 97 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 98 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 99 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 100 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |