| 2001 | Spitfire Energy Group LLC | Oklahoma City, OK 73114-7444 | Oil Operator | Apr 2023 |
| 2002 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Sep 2025 |
| 2003 | Spivey, R. L. | Olney, TX 76374 | Oil Operator | Jul 2005 |
| 2004 | Spivey, William | Hays, KS 67601 | Oil Operator | Jun 1993 |
| 2005 | Splawn & Splawn | Saint Louis, OK 74866-0098 | Oil & Gas Operator | Mar 2025 |
| 2006 | Splechter, Tim | Yates Center, KS 66783 | Oil Operator | Apr 2025 |
| 2007 | SPN Energy, LLC | Guston, KY 40142 | Gas Operator | Dec 2023 |
| 2008 | Spokane Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 2009 | Sponte Operating, Inc. | Dallas, TX 75313 | Oil & Gas Operator | Sep 2025 |
| 2010 | Spoonemore Brothers | Spearman, TX 79081 | Oil & Gas Operator | Nov 2019 |
| 2011 | Spooner & Marlin Expl., Inc. | | Oil & Gas Operator | Mar 1990 |
| 2012 | Spooner Petroleum Company | | Oil & Gas Operator | May 2025 |
| 2013 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 2014 | Spotted Hawk Development, LLC | | Oil & Gas Operator | Jul 2025 |
| 2015 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | Apr 2025 |
| 2016 | Spragins Ed S | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 2017 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 2018 | Sprague, Gary L. | Versailles, NY 14168 | Gas Operator | Dec 2024 |
| 2019 | Spri Oil & Gas, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2020 |
| 2020 | Spring Creek Farm And Oil, LLC | Bixby, OK 74008 | Oil Operator | Apr 2025 |
| 2021 | Spring Industries Inc | Wellington, FL 33414 | Oil & Gas Operator | Dec 2016 |
| 2022 | Spring Operating Company | Edmond, OK 73034 | Oil & Gas Operator | Jun 2025 |
| 2023 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 2024 | Spring Tide Petroleum Inc | Broken Arrow, OK 74011-6651 | Oil & Gas Operator | Nov 2024 |
| 2025 | Spring Tree Management LC | Abilene, TX 79604 | Oil Operator | May 2013 |
| 2026 | Spring Valley Development Co LLC | Centennial, CO 80014 | Oil & Gas Operator | Jul 2025 |
| 2027 | Spring Valley Oil & Gas Inc | Drummond, OK 73735 | Oil & Gas Operator | Jun 2025 |
| 2028 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 2029 | Springer Energy Company, LLC | Akron, OH 44313 | Oil & Gas Operator | Dec 2024 |
| 2030 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 2031 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Sep 2025 |
| 2032 | Springs, Jesse | Luling, TX 78648 | Oil & Gas Operator | Jun 1998 |
| 2033 | Springville-Griffith Institute Central School Dist | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 2034 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 2035 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Sep 2025 |
| 2036 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Apr 2025 |
| 2037 | Spur Energy | Midland, TX 79708 | Oil & Gas Operator | Mar 1996 |
| 2038 | Spur Energy Partners LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 2039 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Sep 2025 |
| 2040 | Spurgeon William Allan | Nowata, OK 74048-9713 | Oil Operator | Feb 2010 |
| 2041 | Spurgeon William C & Tammy D | Hominy, OK 74035 | Oil & Gas Operator | May 2025 |
| 2042 | Spyglass Cedar Creek, LP | | Gas Operator | Jul 2012 |
| 2043 | Spyglass Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 2044 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Sep 2025 |
| 2045 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 2046 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 2047 | Squaw Mountain Oil, LLC | Jacksboro, TX 76458 | Oil Operator | Sep 2025 |
| 2048 | Squirrel Oil & Gas Inc | Tonkawa, OK 74653 | Oil & Gas Operator | Mar 2022 |
| 2049 | Squyres Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 2050 | SR Production Corp. | Liberty, TX 77575 | Oil & Gas Operator | Mar 2010 |
| 2051 | Sram Oil Incorporated | Winfield, KS 67156 | Oil & Gas Operator | Aug 2005 |
| 2052 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 2053 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 2054 | SRS Properties, LLC | Whitehouse, TX 75791 | Oil & Gas Operator | Sep 2025 |
| 2055 | SRV Oil Co | Coleman, TX 76834 | Oil Operator | Sep 2025 |
| 2056 | SRW Operating LLC | Duncan, OK 73534-2087 | Oil & Gas Operator | Sep 2014 |
| 2057 | SS Operating LLC | Water Valley, TX 76958 | Oil Operator | Sep 2025 |
| 2058 | SSB Production LC | Ardmore, OK 73401 | Oil & Gas Operator | May 2025 |
| 2059 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Sep 2025 |
| 2060 | Ssi Energy LLC | | Oil & Gas Operator | Jul 2021 |
| 2061 | SSM Partnership-PV79 | | Oil Operator | Jun 1989 |
| 2062 | Ssouri Oil Ventures | | Oil Operator | Jan 2022 |
| 2063 | St Cleric Resources LLC | | Gas Operator | Jul 2025 |
| 2064 | St Croix LTD | Fairlawn, OH 44334 | Oil & Gas Operator | Dec 2022 |
| 2065 | St Croix Operating Inc | | Oil Operator | Jun 2025 |
| 2066 | St James Energy Operating Inc | | Oil & Gas Operator | Aug 2013 |
| 2067 | St Joe Petroleum U S Corp | | Oil & Gas Operator | Aug 2000 |
| 2068 | St Joseph Min Co | | Oil Operator | Dec 2023 |
| 2069 | St Michael Exploration | | Oil & Gas Operator | Jun 1987 |
| 2070 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 2071 | St Oil Company LLC | New York, NY 10005-4016 | Oil Operator | May 2025 |
| 2072 | St Petroleum, Inc. | Edgerton, KS 66021 | Oil Operator | Apr 2025 |
| 2073 | St. Cajetan Oil Company, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2025 |
| 2074 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 2075 | St. Clair Oil Co. | St Clairsville, OH 43950 | Oil & Gas Operator | Dec 1997 |
| 2076 | St. Columban'S On The Lake, Inc. | Silver Creek, NY 14136 | Gas Operator | Dec 2024 |
| 2077 | St. Croix Corporation | | Oil & Gas Operator | Apr 1990 |
| 2078 | St. James Oil Corporation | | Oil & Gas Operator | Dec 2009 |
| 2079 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 2080 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 2081 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 2082 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 2083 | St. Paul Oil And Gas Corp. | | Oil & Gas Operator | Aug 1991 |
| 2084 | Sta-Kel Incorporated | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 2085 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 2086 | Staab Energy & Leasing | | Oil Operator | May 2024 |
| 2087 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Apr 2025 |
| 2088 | Staats & Martin | | Oil Operator | Aug 2013 |
| 2089 | Staats, William N | | Oil & Gas Operator | May 2025 |
| 2090 | Stablerock Energy L.L.C. | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2025 |
| 2091 | Stach Enterprises LLC | Nashport, OH 43830 | Oil & Gas Operator | Dec 2021 |
| 2092 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Sep 2025 |
| 2093 | Stachler William L | Danville, OH 43014 | Oil & Gas Operator | Dec 1989 |
| 2094 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 2095 | Stackhouse Construction Inc | Orwell, OH 44076 | Oil & Gas Operator | Dec 2024 |
| 2096 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | May 2025 |
| 2097 | Stacy Reamy | Purdon, TX 76679 | Oil Operator | Sep 2025 |
| 2098 | Stafford, A C | | Oil Operator | Dec 2003 |
| 2099 | Stag Oil Producers Inc | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 2100 | Stagecoach Pipeline & Storage Company LLC | | Gas Operator | Dec 2005 |