| 26001 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 26002 | Siempre Energy Operating, LLC | Houston, TX 77094 | Oil Operator | Apr 2024 |
| 26003 | Siemsen Operating, LLC | Holyrood, KS 67450 | Oil Operator | Dec 2023 |
| 26004 | Sien Operating Company, LLC | San Antonio, TX 78209 | Oil Operator | May 2023 |
| 26005 | Sierra Blanca Operating Company | Cleburne, TX BADADDR | Oil & Gas Operator | May 1999 |
| 26006 | Sierra Drilling | | Oil Operator | Sep 1988 |
| 26007 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 26008 | Sierra Group, L.L.C. | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2024 |
| 26009 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 26010 | Sierra Lima Oil & Gas, LLC | Lubbock, TX 79453 | Oil & Gas Operator | Apr 2024 |
| 26011 | Sierra Madre Natural Res., LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 26012 | Sierra Minerals, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2024 |
| 26013 | Sierra Oil Company | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 26014 | Sierra Petroleum | | Oil & Gas Operator | Sep 1986 |
| 26015 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 26016 | Sierra Reserve Company | | Oil Operator | Dec 1985 |
| 26017 | Sierra Resources, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2023 |
| 26018 | Sierra Resources, LLC | Houston, TX 77219 | Oil & Gas Operator | Aug 2021 |
| 26019 | Sierra Trading Corporation | | Oil & Gas Operator | Sep 1978 |
| 26020 | Siete Oil And Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 26021 | Sigma Corporation | Charleston, WV 25301-0000 | Gas Operator | Dec 2021 |
| 26022 | Sigma Energy & Explor., Co LLC | Ozona, TX 76943 | Oil & Gas Operator | Feb 2010 |
| 26023 | Sigma Energy, LLC | | Oil Operator | Jan 2024 |
| 26024 | Sigma Oper & Develop Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 26025 | Sigmon Construction Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 26026 | Sigmon Production Company, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2013 |
| 26027 | Signal Hill Company LLC | Cody, WY 82414 | Oil & Gas Operator | Mar 2024 |
| 26028 | Signal Hill Expl & Pet Inc | Duncan, OK 73533 | Oil & Gas Operator | Mar 2015 |
| 26029 | Signal Hill Petroleum Inc. | | Oil & Gas Operator | Dec 2023 |
| 26030 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Apr 2024 |
| 26031 | Signal Oil Company, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 26032 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 26033 | Signal, LLC | | Oil & Gas Operator | Jan 2024 |
| 26034 | Signal, LLC Of Mississippi | | Oil & Gas Operator | Dec 2023 |
| 26035 | Signature Exploration Inc. | Shawnee, OK 74804-4130 | Oil & Gas Operator | Mar 2015 |
| 26036 | Sikes Oil Company Inc | Velma, OK 73091-0759 | Oil & Gas Operator | Jan 2014 |
| 26037 | Sikes Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2003 |
| 26038 | Sikes, Arlas M. | Brownwood, TX 76801 | Oil & Gas Operator | May 2000 |
| 26039 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 26040 | Silent Stone Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 26041 | Silhan, Terry | Marion, KS 66861 | Oil & Gas Operator | Dec 2009 |
| 26042 | Sills Oil Co | Osage, OK 74054 | Oil Operator | Aug 2023 |
| 26043 | Siltstone Resources Op II, LLC | Wilmington, DE 19801 | Oil & Gas Operator | Apr 2024 |
| 26044 | Silvco Energy, LLC | | Oil Operator | Apr 2014 |
| 26045 | Silver Creek Oil | Merkel, TX 79536 | Oil & Gas Operator | Aug 2003 |
| 26046 | Silver Creek Oil & Gas, Inc. | Wichita, KS 67203 | Oil Operator | Dec 1997 |
| 26047 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2024 |
| 26048 | Silver Creek Permian Op Co, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2023 |
| 26049 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 26050 | Silver Cross Energy Partners LLC | Richmond, TX 77469 | Oil & Gas Operator | Apr 2024 |
| 26051 | Silver Eagle Oil Company | Ada, OK 74820 | Oil Operator | Dec 2004 |
| 26052 | Silver Exploration Company | | Oil & Gas Operator | Dec 2023 |
| 26053 | Silver Fox Oil & Gas LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 2024 |
| 26054 | Silver Hill Energy Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 26055 | Silver Hill Energy Partners, LLC | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 26056 | Silver Mountain Energy LLC | | Gas Operator | Sep 2023 |
| 26057 | Silver Oak Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2016 |
| 26058 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 26059 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2024 |
| 26060 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2024 |
| 26061 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2024 |
| 26062 | Silver Run Oil & Gas | | Oil & Gas Operator | Dec 2021 |
| 26063 | Silver Spike Energy Oper, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2015 |
| 26064 | Silver Spike Energy Operating Of NM, LLC | Midland, TX 79701 | Oil Operator | Jul 2016 |
| 26065 | Silver Star Of Nevada Inc | | Oil & Gas Operator | Jan 2024 |
| 26066 | Silver Star Operating Co., LLC | Nada, TX 77460 | Gas Operator | Apr 2024 |
| 26067 | Silver Star Production Co | Moore, OK 73160-6202 | Oil & Gas Operator | Feb 2024 |
| 26068 | Silver Thread Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2015 |
| 26069 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 26070 | Silverado Oil Inc | Greeley, CO 80631 | Oil Operator | Apr 2000 |
| 26071 | Silverado Oil LTD | Ardmore, OK 73401 | Oil & Gas Operator | Jun 2003 |
| 26072 | Silverback Operating II, LLC | San Antonio, TX 78256 | Oil & Gas Operator | Feb 2024 |
| 26073 | Silverback Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Oct 2016 |
| 26074 | Silverbow Resources Oper, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 26075 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil & Gas Operator | Apr 2024 |
| 26076 | Silverridge Corp | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2015 |
| 26077 | Silvertin Farm Production LLC | | Oil & Gas Operator | Apr 2020 |
| 26078 | Simar Petroleum, LLC | | Oil Operator | Nov 2023 |
| 26079 | Simasko Producti | | Oil Operator | Dec 1986 |
| 26080 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 26081 | Simata Energy | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 26082 | Simata Energy, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 26083 | Simco Oil Company | | Oil Operator | Jul 1990 |
| 26084 | Simco Oil, LLC | Lytle, TX 78052 | Oil Operator | Apr 2024 |
| 26085 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 26086 | Simco Petroleum | Cheyenne, WY 82003 | Oil & Gas Operator | Oct 2009 |
| 26087 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Feb 2024 |
| 26088 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 26089 | Simme, Steven | Elma, NY 14052 | Gas Operator | Dec 2022 |
| 26090 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 26091 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 26092 | Simmons Mack McCoy | Cement, OK 73017-0424 | Oil Operator | Feb 2024 |
| 26093 | Simmons Oil Corporation | | Oil Operator | Jan 1989 |
| 26094 | Simmons Robert Z | | Oil Operator | Dec 1990 |
| 26095 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 26096 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 26097 | Simmons, Stanley J. | Olney, TX 76374 | Oil & Gas Operator | Aug 1994 |
| 26098 | Simon Joseph W | Carney, OK 74832-0443 | Oil & Gas Operator | Dec 2016 |
| 26099 | Simon Of Bolivar Enterprises Inc | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2022 |
| 26100 | Simon Oil Company | Ardmore, OK 73401-1045 | Oil Operator | Aug 2023 |