| 4001 | Southwest Gas Storage Company | | Gas Operator | Apr 2026 |
| 4002 | Southwest Operating Company | Overland Park, KS 66212 | Oil & Gas Operator | Mar 2012 |
| 4003 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 4004 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 4005 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 4006 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 4007 | Sowle Exploratio | | Oil Operator | Aug 1986 |
| 4008 | Sowle Explorations | | Oil Operator | Dec 2002 |
| 4009 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 4010 | Specht Farms | Piqua, KS 66761 | Oil Operator | Nov 2009 |
| 4011 | Specht Oil | Iola, KS 66749 | Oil Operator | Mar 1998 |
| 4012 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Sep 2026 |
| 4013 | Speedy Well Service | | Oil & Gas Operator | Mar 2026 |
| 4014 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2026 |
| 4015 | Spindletop Oil & | | Oil Operator | Jun 1993 |
| 4016 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Sep 2026 |
| 4017 | Spines Explorati | | Oil & Gas Operator | Dec 1990 |
| 4018 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 4019 | Spivey, William | Hays, KS 67601 | Oil Operator | Jun 1993 |
| 4020 | Splechter, Tim | Yates Center, KS 66783 | Oil Operator | Apr 2026 |
| 4021 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | Mar 2026 |
| 4022 | Spring Creek Farm And Oil, LLC | Bixby, OK 74008 | Oil Operator | Jun 2025 |
| 4023 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 4024 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 4025 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Apr 2026 |
| 4026 | Sram Oil Incorporated | Winfield, KS 67156 | Oil & Gas Operator | Aug 2005 |
| 4027 | Ssouri Oil Ventures | | Oil Operator | Jan 2022 |
| 4028 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 4029 | St Petroleum, Inc. | Edgerton, KS 66021 | Oil Operator | Apr 2026 |
| 4030 | Staab Energy & Leasing | | Oil Operator | Sep 2025 |
| 4031 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Apr 2026 |
| 4032 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 4033 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 4034 | Stalcup Oil Comp | | Oil Operator | Dec 1992 |
| 4035 | Stalcup Oil Company | | Oil Operator | Oct 2009 |
| 4036 | Stallings Eugene | | Oil Operator | Jul 1994 |
| 4037 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 4038 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 4039 | Standlee, Jacci L | Ellinwood, KS 67526 | Oil Operator | Mar 2026 |
| 4040 | Stanlee Oil LLC | | Oil Operator | Apr 2026 |
| 4041 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 4042 | Star Resources, LTD. | Wichita, KS 67202 | Oil Operator | Nov 2002 |
| 4043 | Stauffer Oil & G | | Oil Operator | Jun 1987 |
| 4044 | Stauter, Richard J. | Greeley, CO 80634 | Gas Operator | Apr 1996 |
| 4045 | Stebeth Gas Production, Inc. | Beaumont, KS 67012 | Oil Operator | May 1996 |
| 4046 | Steckel Oil, LLC | Russell, KS 67665 | Oil Operator | Apr 2026 |
| 4047 | Stecklein Oil Co | | Oil Operator | Jul 1993 |
| 4048 | Stecklein Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Mar 2026 |
| 4049 | Steffen Resource Development, LLC | Hutchinson, KS 67502 | Oil & Gas Operator | Apr 2026 |
| 4050 | Steinberger Bros., Inc. | Independence, KS 67301 | Oil Operator | Dec 2009 |
| 4051 | Steinberger Oil Company | Independence, KS 67301 | Oil & Gas Operator | May 2002 |
| 4052 | Steiner Oil And Gas | Lincolnville, KS 66858 | Oil Operator | Jan 1999 |
| 4053 | Steinforth, Loren | Yates Center, KS 66783 | Oil Operator | Sep 2014 |
| 4054 | Steinle Oil | | Oil Operator | Aug 2021 |
| 4055 | Steinle, Martin D. | Bunker Hill, KS 67626 | Oil Operator | Mar 2026 |
| 4056 | Stekoll Petroleu | | Oil Operator | Oct 1985 |
| 4057 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 4058 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 4059 | Stepco Incorpora | | Oil Operator | Nov 1994 |
| 4060 | Stepco Oil, Inc. | Ellinwood, KS 67526 | Oil Operator | Jan 2020 |
| 4061 | Stepco, Inc. | Ellinwood, KS 67526 | Oil Operator | Feb 2005 |
| 4062 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 4063 | Stephens Oil Co. | | Oil Operator | Dec 2017 |
| 4064 | Stephenson John | | Oil Operator | Dec 1985 |
| 4065 | Stephenson L G & | | Oil Operator | Apr 1987 |
| 4066 | Sterling Drillin | | Oil & Gas Operator | Mar 1992 |
| 4067 | Sterling Drilling Company | Pratt, KS 67124 | Oil & Gas Operator | Apr 2014 |
| 4068 | Sterling Explora | | Oil & Gas Operator | Jun 1994 |
| 4069 | Sterling Exploration | Lee'S Summit, MO 64082 | Gas Operator | Nov 1997 |
| 4070 | Sterling Oil & G | | Oil Operator | May 1984 |
| 4071 | Sterling Oil Co. | Sterling, KS 67579 | Oil Operator | Feb 2000 |
| 4072 | Sterling Petrole | | Oil & Gas Operator | Sep 1992 |
| 4073 | Steve'S Oilfield | | Oil Operator | Jul 1994 |
| 4074 | Stewart Oil Co. | | Oil Operator | Jun 2009 |
| 4075 | Stewart Oil Comp | | Oil Operator | Jul 1993 |
| 4076 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 4077 | Stewart Producers, Inc. | Mount Vernon, IL 62864 | Oil & Gas Operator | Apr 2026 |
| 4078 | Stewart W C Oil | | Oil Operator | Jun 1986 |
| 4079 | Stewart, William C. | Amarillo, TX 79105 | Gas Operator | May 2003 |
| 4080 | Stice Oil Company | | Oil Operator | Mar 2026 |
| 4081 | Stich Oil Company, A General Partnership | Chanute, KS 66720 | Oil Operator | Jul 2014 |
| 4082 | Stifter, Ralph E | Rantoul, KS 66079 | Oil Operator | Sep 2001 |
| 4083 | Stixon Petroleum | | Oil Operator | Dec 1996 |
| 4084 | STL Oil & Gas LLC | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2016 |
| 4085 | Stoeppelwerth DR | | Oil Operator | May 1993 |
| 4086 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 2026 |
| 4087 | Stone Oil Compan | | Oil Operator | Jan 1990 |
| 4088 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 4089 | Stonegate Ranch LLC | Caney, KS 67333 | Oil & Gas Operator | Apr 2026 |
| 4090 | Stoskopf, Wayne | Hoisington, KS 67544 | Oil Operator | Apr 1995 |
| 4091 | Stotts-Kirkpatri | | Oil Operator | Oct 1991 |
| 4092 | Stoudt, Jean Marie | Broken Arrow, OK 74011 | Oil Operator | Apr 2026 |
| 4093 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 4094 | Strabala Joseph | | Oil Operator | Jan 1992 |
| 4095 | Strait F W Incor | | Oil Operator | Jan 1992 |
| 4096 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 4097 | Strata Energy Re | | Oil Operator | Nov 1987 |
| 4098 | Strata Exploration, Inc. | Fairfield, IL 62837 | Oil & Gas Operator | Apr 2026 |
| 4099 | Strata Oil Incor | | Oil Operator | Mar 1994 |
| 4100 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Apr 2026 |