| 27101 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 27102 | Skidmore Energy,Inc. | Salado, TX 76571 | Oil & Gas Operator | Jun 1999 |
| 27103 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 27104 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 27105 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | May 2025 |
| 27106 | Skinner Corporation | | Oil Operator | Apr 1985 |
| 27107 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 27108 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 27109 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |
| 27110 | Skinner, Robert V. | Spearman, TX 79081 | Oil & Gas Operator | Aug 2008 |
| 27111 | Skinner, W. E. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 27112 | Skinnergy Co. | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 27113 | Skipworth, Joseph D | | Oil Operator | Dec 2021 |
| 27114 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 27115 | Sklar | | Oil & Gas Operator | Dec 2024 |
| 27116 | Sklar & Phillips - Harry Hurt | | Oil & Gas Operator | Jul 1986 |
| 27117 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 27118 | Sklar & Phillips Oil Co.-Entex | | Oil & Gas Operator | Aug 1978 |
| 27119 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 27120 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 27121 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 27122 | Skora, James B. | Lawtons, NY 14091 | Gas Operator | Dec 2023 |
| 27123 | Skrivanos Engineering, Inc. | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2011 |
| 27124 | Skrzynski, Thomas J. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 27125 | SKS Oil | Olney, TX 76374 | Oil & Gas Operator | May 2025 |
| 27126 | Skubis, Daniel J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 27127 | Skull Creek A LLC | Douglas, WY 82633 | Oil & Gas Operator | Mar 2025 |
| 27128 | Skull Creek Oil & Gas LLC | | Oil Operator | Feb 2025 |
| 27129 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 27130 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 27131 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 27132 | Skybox, LLC | | Gas Operator | Dec 2021 |
| 27133 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 27134 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 27135 | Skye MS, LLC | | Oil & Gas Operator | Mar 2025 |
| 27136 | Skyhawk Energy, LLC | | Oil Operator | Dec 2024 |
| 27137 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 27138 | Skyline Operating Company, LLC | Alpine, UT 84004 | Oil & Gas Operator | Feb 2025 |
| 27139 | Skyliner Energy LLC | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 27140 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | May 2025 |
| 27141 | Skyway Energy LLC | Leesburg, OH 34748 | Oil & Gas Operator | Dec 2020 |
| 27142 | SKZ Inc. | | Oil Operator | Mar 1988 |
| 27143 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 27144 | Slack, R. C. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2000 |
| 27145 | Slagel, H. P. Prod. Co. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2006 |
| 27146 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 27147 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 27148 | Slapco - Emerald Exploration | | Gas Operator | Sep 1979 |
| 27149 | Slape Oil Company, Inc. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 27150 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 27151 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 27152 | Slatex Well Service, Inc. | Batson, TX 77519 | Oil Operator | May 2025 |
| 27153 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 27154 | Slaughter, Norman C. | | Oil & Gas Operator | Dec 2012 |
| 27155 | Slavens II Paul R | Tulsa, OK 74131-2244 | Oil & Gas Operator | Feb 2025 |
| 27156 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 27157 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 27158 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 27159 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 27160 | Slayton Resources Inc | Roswell, NM 88202 | Oil & Gas Operator | Mar 2025 |
| 27161 | Sledge Bros. Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2016 |
| 27162 | Sledge Olen | Duncan, OK 73533 | Oil Operator | Nov 2024 |
| 27163 | Sledge, H. G., Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2016 |
| 27164 | Sleeth And Brooks Oil Co. | | Oil Operator | Jul 1989 |
| 27165 | Slick Inc. | MC Gregor, TX 76657 | Oil Operator | May 2025 |
| 27166 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 27167 | Slick Production, LLC | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 27168 | Slik-Dril P & A Inc | | Oil & Gas Operator | Sep 1989 |
| 27169 | Slik-Dril, Inc | | Oil & Gas Operator | Nov 1998 |
| 27170 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 27171 | Slingshot Oil & Gas | Houston, TX 77019 | Oil Operator | May 2025 |
| 27172 | Slinkard, Roberta S | | Oil Operator | Jan 2025 |
| 27173 | Sliverville Oil Co LLC | Bradford, PA 16701-2770 | Oil & Gas Operator | Dec 2024 |
| 27174 | SLMW Energy Comp | | Oil Operator | Jan 1989 |
| 27175 | Slo Oil, LLC | El Dorado, KS 67042 | Oil Operator | Nov 2024 |
| 27176 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 27177 | Sloan Operations | | Oil Operator | Oct 2024 |
| 27178 | Sloan Petroleum Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 27179 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Mar 2025 |
| 27180 | Sloan Production Co | | Oil Operator | Jan 2013 |
| 27181 | Slohcin, Inc. | Shelby, MT 59474 | Oil Operator | Apr 2025 |
| 27182 | Slone Energy, LLC | Oil Springs, KY 41238 | Oil & Gas Operator | Dec 2023 |
| 27183 | Slone, VIctor R | | Oil Operator | Apr 2024 |
| 27184 | Slow Poke Production-George L. Dobson Dba | Cut Bank, MT 59427 | Gas Operator | Mar 2025 |
| 27185 | Slow Stroke Productions LLC | | Oil Operator | Feb 2025 |
| 27186 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Feb 2025 |
| 27187 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | May 2025 |
| 27188 | SLT Production LLC | Sheffield, PA 16347-0547 | Oil & Gas Operator | Dec 2024 |
| 27189 | SM Energy | Denver, CO 80203-4361 | Gas Operator | Feb 2015 |
| 27190 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 27191 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2025 |
| 27192 | SM Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 27193 | SM&O LLC | | Oil & Gas Operator | Feb 2025 |
| 27194 | Smackco, LTD. | | Oil & Gas Operator | Oct 2002 |
| 27195 | Smackover Drilling Company Inc | Shreveport, LA 71104 | Oil & Gas Operator | Nov 2024 |
| 27196 | Smackover Producing Co | | Oil & Gas Operator | Sep 2024 |
| 27197 | Smackover Shell LTD. Partnership | Houston, TX 77001 | Gas Operator | Apr 2000 |
| 27198 | Smail Denny Lee | Harvey, LA 70058 | Oil & Gas Operator | Dec 2024 |
| 27199 | Smail, James R. | Big Prairie, OH 44611 | Oil & Gas Operator | Dec 1998 |
| 27200 | Smal Energy Corp | Tyler, TX 75710 | Oil & Gas Operator | Oct 1995 |