| 27001 | Schalk Development Co | Albuquerque, NM 87125 | Oil & Gas Operator | Dec 2025 |
| 27002 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 27003 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 27004 | Schankie & Sons, LLC | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 27005 | Schankie Well Se | | Oil Operator | Mar 1995 |
| 27006 | Schankie Well Service, Inc. | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 27007 | Scheck Oil Operation | | Oil & Gas Operator | Sep 2025 |
| 27008 | Scheibmeir, Daryl | Piqua, KS 66761 | Oil Operator | Aug 2025 |
| 27009 | Schenk Oil Co. | Scotland, TX 76379 | Oil Operator | Feb 2026 |
| 27010 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 27011 | Schetawee, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Mar 2008 |
| 27012 | Schettler William D | Fletcher, OK 73541-4117 | Oil & Gas Operator | Oct 2021 |
| 27013 | Scheuneman, Lester | Ridgeway, MO 64481 | Oil Operator | May 2019 |
| 27014 | Schichtel'S Nursery, Inc. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 27015 | Schierling Eldon | | Oil & Gas Operator | Aug 1986 |
| 27016 | Schierling, Eldon J. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 27017 | Schievelbein, Bryan O. | Seguin, TX 78155 | Oil & Gas Operator | Feb 2026 |
| 27018 | Schiff & Jackson Oil Producers | Dallas, TX 75206 | Oil & Gas Operator | Nov 2025 |
| 27019 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 27020 | Schindler Oil | | Oil Operator | Dec 2009 |
| 27021 | Schindler Oil, LLC | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 27022 | Schindler, Joe | Madison, KS 66860 | Oil Operator | Jun 2025 |
| 27023 | Schippers Oilfield Services, LLC | Hoxie, KS 67740 | Oil Operator | Jun 2025 |
| 27024 | Schiralli, Bradley L. | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2024 |
| 27025 | Schiralli, Bradley L. And Paffie, Ronald | | Oil & Gas Operator | Dec 2024 |
| 27026 | Schkade & Bullock | San Angelo, TX 76901 | Oil & Gas Operator | Aug 2003 |
| 27027 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 27028 | Schkade Exploration | San Angelo, TX 76901 | Oil & Gas Operator | Feb 2026 |
| 27029 | Schkade Production Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2020 |
| 27030 | Schkade, Carl E. | Albany, TX 76430 | Oil & Gas Operator | Sep 2009 |
| 27031 | Schkade, Harold | Albany, TX 76430 | Oil & Gas Operator | Aug 2024 |
| 27032 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 27033 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 27034 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 27035 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 27036 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 27037 | Schlaikjer A L | | Oil Operator | Feb 1997 |
| 27038 | Schlittler, Willard | Bryson, TX 76427 | Oil & Gas Operator | Feb 2026 |
| 27039 | Schlobohm Starr | | Oil Operator | Dec 1996 |
| 27040 | Schlobohm, Starr F. | Wolfeboro, NH 03894 | Oil Operator | Jul 2004 |
| 27041 | Schlotterbeck Ir | | Oil Operator | Nov 1990 |
| 27042 | Schmeid Ranch, LLC | Hays, KS 67601 | Oil Operator | Jun 2024 |
| 27043 | Schmelzer Mark | Rushville, OH 43150 | Oil & Gas Operator | Dec 2007 |
| 27044 | Schmelzer Maurice | Bremen, OH 43107 | Oil & Gas Operator | Dec 2024 |
| 27045 | Schmelzer Plugging LLC | Bremen, OH 43107 | Oil & Gas Operator | Dec 2024 |
| 27046 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Feb 2026 |
| 27047 | Schmidt Construction Services LLC | | Oil Operator | Aug 2025 |
| 27048 | Schmidt Kermit O | | Oil & Gas Operator | Sep 1995 |
| 27049 | Schmidt Production | Rocky Comfort, MT 64861 | Oil Operator | Sep 2015 |
| 27050 | Schmidt, John T., Jr. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 27051 | Schmidt, Kermit | | Oil & Gas Operator | Dec 2009 |
| 27052 | Schmidt, Norman D. | Galva, KS 67443 | Gas Operator | Oct 1997 |
| 27053 | Schmidt, Terry D. | McPherson, KS 67460 | Oil Operator | Sep 2025 |
| 27054 | Schmidt, Tracy | McPherson, KS 67460 | Oil Operator | Sep 2025 |
| 27055 | Schmitt Carmen I | | Oil Operator | Dec 1996 |
| 27056 | Schmitz, Michael E. | Sherman, NY 14781 | Gas Operator | Dec 2024 |
| 27057 | Schmude And Pangborn Associates | | Oil Operator | Apr 1993 |
| 27058 | Schmude Oil Co | | Oil Operator | Mar 2014 |
| 27059 | Schmude Oil Inc | | Oil Operator | Jul 2016 |
| 27060 | Schneider Edward H | Bridgeville, PA 15017-2165 | Gas Operator | Dec 2025 |
| 27061 | Schneider Energy Services Inc | | Oil & Gas Operator | Dec 2024 |
| 27062 | Schneider Oil Co | | Oil Operator | Oct 1988 |
| 27063 | Schneider Oil Corporation | Broomfield, CO 80020 | Oil & Gas Operator | Aug 2009 |
| 27064 | Schneider Oil LLC | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2022 |
| 27065 | Schneider, Ernest | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2014 |
| 27066 | Schnell Louis L | | Oil Operator | Dec 2015 |
| 27067 | Schneltz Oil Com | | Oil Operator | May 1992 |
| 27068 | Schonfield Harold Gene | Bristow, OK 74010 | Oil Operator | Mar 2015 |
| 27069 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 27070 | School Creek Corporation | Winfield, KS 67156 | Oil Operator | Jan 2000 |
| 27071 | Schooley Keith A | Enid, OK 73702-0767 | Oil Operator | May 2006 |
| 27072 | Schrader Lawayne | Fort Worth, TX 76135 | Oil Operator | Mar 2019 |
| 27073 | Schrader Willard C | Tionesta, PA 16353-8114 | Oil & Gas Operator | Dec 2025 |
| 27074 | Schrag Herman | | Oil & Gas Operator | Oct 1990 |
| 27075 | Schrag Oil Co | | Oil & Gas Operator | Jun 2004 |
| 27076 | Schrecengost Fred M | Sligo, PA 16255-0216 | Oil & Gas Operator | Dec 2016 |
| 27077 | Schreiber Oil Co. | | Oil Operator | Dec 2009 |
| 27078 | Schreiber, Donald And Marilyn | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 27079 | Schreiber, Lloyd | Scotland, TX 76379 | Oil & Gas Operator | Dec 2000 |
| 27080 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 27081 | Schreiner Oil & Gas Inc | Prescott, AZ 86303 | Oil & Gas Operator | Dec 2023 |
| 27082 | Schrimsher Oil & Gas Expl | Orlando, FL 32803 | Oil & Gas Operator | Dec 1992 |
| 27083 | Schroeder Oil Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 2022 |
| 27084 | Schroeder, Donald C | | Oil & Gas Operator | Aug 2025 |
| 27085 | Schuetz, Edna, Ed & Ronald(Deceased) | Coffeyville, KS 67337 | Oil Operator | Nov 2011 |
| 27086 | Schulein Company LLC | Denver, CO 80246 | Oil & Gas Operator | Aug 2025 |
| 27087 | Schulein Robert | | Oil & Gas Operator | Dec 1995 |
| 27088 | Schuler Jr Chris C | Cleveland, OK 74020 | Oil Operator | Aug 2013 |
| 27089 | Schuler Oil Properties LLC | Cleveland, OK 74020 | Oil Operator | Nov 2025 |
| 27090 | Schulte Oil | Garnett, KS 66032 | Oil Operator | Mar 2022 |
| 27091 | Schulte Oil - C | | Oil Operator | Dec 1989 |
| 27092 | Schultheis Oil & Gas | Whipple, OH 45780 | Oil & Gas Operator | Dec 2023 |
| 27093 | Schultz Run Gas Company | | Oil & Gas Operator | Dec 2021 |
| 27094 | Schulz Oil & Gas, Inc. | Canton, KS 67428 | Oil & Gas Operator | Dec 2024 |
| 27095 | Schulz Roger A | | Oil & Gas Operator | Dec 1996 |
| 27096 | Schupp, David And Barbara | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 27097 | Schuster Homes Inc | Rangely, CO 81648 | Oil & Gas Operator | Apr 2013 |
| 27098 | Schutz* Richard E | | Oil Operator | Dec 2024 |
| 27099 | Schwab City Resources | Leggett, TX 77350 | Oil & Gas Operator | Aug 2013 |
| 27100 | Schwanco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1987 |