| 27001 | Southwestern Inc | Hobbs, NM 88240 | Oil Operator | Oct 2009 |
| 27002 | Southwestern Oil Corporation | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2026 |
| 27003 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Jul 2026 |
| 27004 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 27005 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 27006 | Southwind Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 27007 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 27008 | Sovereign Eagle, LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2018 |
| 27009 | Sovereign Energy Corp. | | Oil Operator | Dec 2001 |
| 27010 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 27011 | Sovereign Petroleum Company, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2013 |
| 27012 | Sowers William & Sara | Blue Rock, OH 43720 | Oil Operator | Dec 2022 |
| 27013 | Sowle Exploratio | | Oil Operator | Aug 1986 |
| 27014 | Sowle Explorations | | Oil Operator | Dec 2002 |
| 27015 | Soxgi LLC | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 27016 | Sozo Natural Resources LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 27017 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 27018 | Space Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Sep 2026 |
| 27019 | Spacht, James W. & Shelly F | Ripley, NY 14775 | Gas Operator | Dec 2025 |
| 27020 | Spade Energy L.L.C. | Fort Worth, TX 76177 | Oil & Gas Operator | Sep 2026 |
| 27021 | Spain Oil Company | Somerset, TX 78069 | Oil & Gas Operator | Sep 2026 |
| 27022 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 27023 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 27024 | Spark'S Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2014 |
| 27025 | Sparkman Rodger E | Jenks, OK 74037-0267 | Oil Operator | Sep 2018 |
| 27026 | Sparks Daniel M | Chickasha, OK 73023-1435 | Oil & Gas Operator | Apr 2014 |
| 27027 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | May 2026 |
| 27028 | Sparks Harold | Radnor, OH 43066 | Oil & Gas Operator | Dec 1987 |
| 27029 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | Jun 2026 |
| 27030 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 27031 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Jun 2026 |
| 27032 | Sparks, Pearlman E | Mazie, KY 41160 | Oil Operator | Dec 2015 |
| 27033 | Sparks, Sidney A., Trustee | Alice, TX 78332 | Oil & Gas Operator | Jun 1996 |
| 27034 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | May 2026 |
| 27035 | Sparrow Oil & Gas LLC | | Oil & Gas Operator | Jun 2026 |
| 27036 | Sparrow Operating LLC | Comanche, OK 73529-9747 | Oil Operator | Apr 2026 |
| 27037 | Sparta Energy Corp | Oak Brook, IL 60521 | Oil & Gas Operator | Dec 1985 |
| 27038 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2026 |
| 27039 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 27040 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 27041 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 27042 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 27043 | Spartan Resource MGMT Corp | | Gas Operator | Dec 2025 |
| 27044 | Spartan Resources LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 27045 | Spartan Royalties, LLC | | Oil Operator | Dec 2024 |
| 27046 | SPC Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2024 |
| 27047 | Spear Production Company, Inc. | Shreveport, LA 71161 | Oil Operator | Sep 2026 |
| 27048 | Spearco Oil | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 27049 | Spearpoint Energy LLC | Seminole, OK 74818-1247 | Oil Operator | Jun 2015 |
| 27050 | Spears Terry | Osage, OK 74054 | Oil Operator | May 2026 |
| 27051 | Speartex Grain Company | Gruver, TX 79040 | Oil & Gas Operator | Sep 2026 |
| 27052 | Speartip Energy, LLC | Katy, TX 77450 | Oil Operator | Sep 2026 |
| 27053 | Specht Farms | Piqua, KS 66761 | Oil Operator | Nov 2009 |
| 27054 | Specht Oil | Iola, KS 66749 | Oil Operator | Mar 1998 |
| 27055 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Sep 2026 |
| 27056 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Sep 2026 |
| 27057 | Specialized Technological Threading, Inc., | | Oil & Gas Operator | Oct 2019 |
| 27058 | Speckle Trout Operating LLC | Diboll, TX 75941 | Oil Operator | Sep 2026 |
| 27059 | Speco Oil Company | | Oil & Gas Operator | Feb 1980 |
| 27060 | Spectral Oil & Gas Corporation | Humble, TX 77338 | Oil Operator | Sep 2026 |
| 27061 | Spectrum Energy Inc | Scottsdale, AZ 85257 | Oil & Gas Operator | Oct 2003 |
| 27062 | Spectrum Field Services Inc | Tulsa, OK 74136-3400 | Oil & Gas Operator | Jan 2004 |
| 27063 | Spectrum Oil Company | Irving, TX 75063 | Oil & Gas Operator | May 2013 |
| 27064 | Spectrum Oil Corporation | Marietta, OH 45750 | Oil & Gas Operator | Dec 1993 |
| 27065 | Spectrum Opco LLC | | Oil & Gas Operator | Nov 2024 |
| 27066 | Spectrum Resources LLC | Charlotte, NC 28211-4081 | Oil Operator | Oct 2009 |
| 27067 | Speed James F | Ada, OK 74821-1221 | Oil & Gas Operator | Nov 2009 |
| 27068 | Speed, F. Michael, Trustee | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 1998 |
| 27069 | Speedy Well Service | | Oil & Gas Operator | Mar 2026 |
| 27070 | Speegle Oil And Gas Company | Longview, TX 75605 | Oil & Gas Operator | Sep 2026 |
| 27071 | Speer Kenneth G | Seminole, OK 74818-1202 | Oil & Gas Operator | Dec 2001 |
| 27072 | Speir R M Operating Company | Walters, OK 73572-3933 | Oil Operator | May 2026 |
| 27073 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 27074 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2026 |
| 27075 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Sep 2026 |
| 27076 | Spence, Ralph Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2023 |
| 27077 | Spencer Enterprises Dba Hugh Spencer | Smithburg, WV 264360000 | Oil & Gas Operator | Dec 2021 |
| 27078 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | May 2026 |
| 27079 | Spencer Oil Company LLC | Bartlesville, OK 74006 | Oil Operator | Jan 2015 |
| 27080 | Spencer Petroleum Corp | Akron, OH 44319 | Oil & Gas Operator | Dec 2000 |
| 27081 | Spencer-Cloughly Investments Inc | San Marcos, TX 78666 | Oil & Gas Operator | Aug 2002 |
| 27082 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 27083 | Sperry R J | Dallas, TX 75254-8647 | Oil & Gas Operator | Aug 2013 |
| 27084 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jun 2026 |
| 27085 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Apr 2026 |
| 27086 | SPH Development, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2022 |
| 27087 | Spheric Petroleum Inc. | Pikesville, MD 21208 | Oil & Gas Operator | Nov 2006 |
| 27088 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 27089 | Spicer Oil Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2008 |
| 27090 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Sep 2026 |
| 27091 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 27092 | Spike, David C. And Arlene M. | Bloomfield, NY 14469 | Gas Operator | Dec 2025 |
| 27093 | Spikes, Harry | Henrietta, TX 76365 | Oil & Gas Operator | Sep 2000 |
| 27094 | Spiller Oil & Gas Company | Jacksboro, TX 76458 | Oil Operator | Sep 2026 |
| 27095 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 27096 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 27097 | Spiller, J. A. Company | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 27098 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 27099 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 27100 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |