| 101 | Schneider Oil Co | | Oil Operator | Oct 1988 |
| 102 | Schneltz Oil Com | | Oil Operator | May 1992 |
| 103 | School Creek Corporation | Winfield, KS 67156 | Oil Operator | Jan 2000 |
| 104 | Schreiber Oil Co. | | Oil Operator | Dec 2009 |
| 105 | Schuetz, Edna, Ed & Ronald(Deceased) | Coffeyville, KS 67337 | Oil Operator | Nov 2011 |
| 106 | Schulein Company LLC | Denver, CO 80246 | Oil & Gas Operator | Apr 2026 |
| 107 | Schulein Robert | | Oil & Gas Operator | Dec 1995 |
| 108 | Schulte Oil | Garnett, KS 66032 | Oil Operator | Mar 2022 |
| 109 | Schulte Oil - C | | Oil Operator | Dec 1989 |
| 110 | Schulz Oil & Gas, Inc. | Canton, KS 67428 | Oil & Gas Operator | Apr 2026 |
| 111 | Schulz Roger A | | Oil & Gas Operator | Dec 1996 |
| 112 | Schwertfeger, Donald E. Oil | Preston, KS 67569 | Oil Operator | Jan 1999 |
| 113 | Schwien Tank & Lease Service Inc | Bazine, KS 67516 | Oil Operator | May 2000 |
| 114 | Scimitar Resc Li | | Oil Operator | Oct 1982 |
| 115 | Scott Services LLC | Plainville, KS 67663 | Oil Operator | Apr 2026 |
| 116 | Scott Works LLC | | Oil Operator | Mar 2026 |
| 117 | Scott'S Production, LLC | Roxbury, KS 67476 | Oil Operator | Apr 2026 |
| 118 | Scott'S Well Service Inc | Roxbury, KS 67476 | Oil Operator | Nov 2012 |
| 119 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 120 | SCZ Resources, LLC | Houston, TX 77055 | Oil Operator | Apr 2026 |
| 121 | Sdoco, LLC | Highlands Ranch, CO 80129 | Oil Operator | Mar 2026 |
| 122 | Seagull Operatin | | Oil & Gas Operator | Jul 1995 |
| 123 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 124 | Sedona Oil & Gas Corporation | Dallas, TX 75231 | Oil & Gas Operator | Sep 2026 |
| 125 | See Oil | | Oil Operator | Apr 2026 |
| 126 | Seed Group/Aa Drilling | | Oil Operator | Oct 2009 |
| 127 | Seeker, LLC | Newkirk, OK 74647 | Oil & Gas Operator | Nov 2019 |
| 128 | Seelig Oil Corpo | | Oil Operator | Apr 1985 |
| 129 | Seewald, Hughes | Amarillo, TX 79105 | Gas Operator | Jan 1997 |
| 130 | Seibert Oil, LLC | Macksville, KS 67557 | Oil & Gas Operator | Jul 2025 |
| 131 | Sek Energy, LLC | Benedict, KS 66714 | Oil & Gas Operator | Apr 2026 |
| 132 | Sek Oil Incorpor | | Oil Operator | Jun 1985 |
| 133 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 134 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 135 | Serendipity Production Company LC | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2020 |
| 136 | Servco Productio | | Oil Operator | Dec 1992 |
| 137 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 138 | Ses Oil | | Oil Operator | Jun 2004 |
| 139 | Seydell, E. Morris | Wichita Falls, TX 76307 | Oil Operator | Feb 1993 |
| 140 | Seymour Oil Co Inc | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 141 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Mar 2026 |
| 142 | Shade Tree Oil C | | Oil Operator | Oct 1987 |
| 143 | Shaffer Oil Co., Inc. | Burlington, KS 66839 | Oil & Gas Operator | Jul 2001 |
| 144 | Shaffer Oil Leas | | Oil Operator | May 1993 |
| 145 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2026 |
| 146 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jun 2026 |
| 147 | Shamball Oil | | Oil Operator | Apr 2026 |
| 148 | Sharon Resources | | Oil Operator | Sep 1995 |
| 149 | Sharon Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2010 |
| 150 | Sharp Engineerin | | Oil Operator | Aug 1995 |
| 151 | Sharp, Harry D. | Leawood, KS 66209 | Oil Operator | May 1997 |
| 152 | Sharp, Robert L. &/Or Cindy | | Oil Operator | Nov 2019 |
| 153 | Shaw George R | | Oil & Gas Operator | Mar 1992 |
| 154 | Shaw Robert Lesl | | Oil Operator | Oct 1989 |
| 155 | Shaw, George R. (Deceased) | Wichita, KS 67202 | Gas Operator | Dec 2009 |
| 156 | Shawmar Oil & Gas Co., Inc. | Sunnyvale, TX 75182 | Oil & Gas Operator | Dec 2023 |
| 157 | Shawmar Oil Comp | | Oil & Gas Operator | Feb 1995 |
| 158 | Shawnee Investment Company, Inc. | Council Grove, KS 66846 | Oil Operator | Apr 2002 |
| 159 | Shearhart, Gary L. | Havana, KS 67347 | Oil Operator | Oct 2001 |
| 160 | Sheedy Energy Production Company | | Oil Operator | Mar 2026 |
| 161 | Sheel Oil Compan | | Oil Operator | Jan 1985 |
| 162 | Sheffler Industries | Phoenix, AZ 85013 | Oil Operator | Aug 1999 |
| 163 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Apr 2026 |
| 164 | Sheldon Brothers Agency | Salina, KS 67402 | Oil Operator | May 1998 |
| 165 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 166 | Shelley, Randall D. | Wichita, KS 67202 | Oil Operator | Mar 2026 |
| 167 | Shelton, Robert | Lacygne, KS 66040 | Oil Operator | Mar 2026 |
| 168 | Shepler & Thomas | | Oil & Gas Operator | Oct 1992 |
| 169 | Shepler & Thomas, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 170 | Sher-Lon Corpora | | Oil Operator | Apr 1994 |
| 171 | Sheri-Di Product | | Oil Operator | Apr 1994 |
| 172 | Shields Oil Prod | | Oil & Gas Operator | Aug 1995 |
| 173 | Shields Oil Producers Inc. | Russell, KS 67665 | Oil Operator | Apr 2026 |
| 174 | Sho-Bar Energy I | | Oil & Gas Operator | Jan 1991 |
| 175 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Apr 2026 |
| 176 | Shoreline Energy Partners, LLC | Chandler, AZ 85249 | Oil Operator | May 2011 |
| 177 | Shoreline Operating LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2026 |
| 178 | Short W D Oil Co | | Oil Operator | Mar 1996 |
| 179 | Shorts Production LLC | Havana, KS 67347 | Oil Operator | Mar 2026 |
| 180 | Shouse, Micheal C. | Liberty, MO 64068 | Oil & Gas Operator | Jan 1996 |
| 181 | Shultz, Melvin W. | Parsons, KS 67357 | Oil Operator | Nov 1995 |
| 182 | Sidwell Oil & Ga | | Oil & Gas Operator | May 1993 |
| 183 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 184 | Sieg Energy, Inc. | Ottawa, KS 66067 | Oil Operator | Nov 2025 |
| 185 | Siegfried R H In | | Oil Operator | Apr 1985 |
| 186 | Siemsen Operating, LLC | Holyrood, KS 67450 | Oil Operator | Mar 2026 |
| 187 | Sierra Drilling | | Oil Operator | Sep 1988 |
| 188 | Sierra Madre LLC | Greensburg, KS 67054 | Oil & Gas Operator | May 2015 |
| 189 | Sierra Petroleum | | Oil & Gas Operator | Sep 1986 |
| 190 | Silhan, Terry | Marion, KS 66861 | Oil & Gas Operator | Dec 2009 |
| 191 | Silver Creek Oil | Merkel, TX 79536 | Oil & Gas Operator | Aug 2003 |
| 192 | Silver Creek Oil & Gas, Inc. | Wichita, KS 67203 | Oil Operator | Dec 1997 |
| 193 | Simasko Producti | | Oil Operator | Dec 1986 |
| 194 | Simco Petroleum | Cheyenne, WY 82003 | Oil & Gas Operator | Oct 2009 |
| 195 | Simminger, Robert John Jr | | Oil Operator | Dec 2025 |
| 196 | Simmons Oil Corp | | Oil Operator | Jan 1989 |
| 197 | Simmons Robert Z | | Oil Operator | Dec 1990 |
| 198 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Sep 2026 |
| 199 | Sirius Energy Corp. | Abilene, TX 79606 | Oil Operator | Dec 2009 |
| 200 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Apr 2026 |