| 4301 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 4302 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 4303 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 4304 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 4305 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 4306 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 4307 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 4308 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 4309 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 4310 | Southwest Gas Producing Co Inc | | Oil & Gas Operator | Nov 1994 |
| 4311 | Southwest General Dev., Inc. | | Oil & Gas Operator | Dec 2003 |
| 4312 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 4313 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 4314 | Southwest Rig Service | | Oil & Gas Operator | Nov 1998 |
| 4315 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 4316 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 4317 | Southwind Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 4318 | Sovereign Energy Corp. | | Oil Operator | Dec 2001 |
| 4319 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 4320 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 4321 | Spartan Royalties, LLC | | Oil Operator | Dec 2024 |
| 4322 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Mar 2025 |
| 4323 | Speco Oil Company | | Oil & Gas Operator | Feb 1980 |
| 4324 | Spectrum Opco LLC | | Oil & Gas Operator | Nov 2024 |
| 4325 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 4326 | Spillers Petroleum, Inc. | | Gas Operator | Mar 2010 |
| 4327 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 4328 | Spirit Petroleum Company | | Oil & Gas Operator | Apr 1999 |
| 4329 | Spokane Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 4330 | Spooner & Marlin Expl., Inc. | | Oil & Gas Operator | Mar 1990 |
| 4331 | Spooner Petroleum Company | | Oil & Gas Operator | Nov 2024 |
| 4332 | Spyglass Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 4333 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 4334 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 4335 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 4336 | Ssi Energy LLC | | Oil & Gas Operator | Jul 2021 |
| 4337 | SSM Partnership-PV79 | | Oil Operator | Jun 1989 |
| 4338 | St. Croix Corporation | | Oil & Gas Operator | Apr 1990 |
| 4339 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 4340 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 4341 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 4342 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 4343 | St. Paul Oil And Gas Corp. | | Oil & Gas Operator | Aug 1991 |
| 4344 | Stallion Oil Corporation | | Oil & Gas Operator | Nov 1987 |
| 4345 | Stanco Petroleum Inc | Kimball, NE 69145 | Oil & Gas Operator | Jul 1999 |
| 4346 | Standard Operating Company, LLC | | Oil & Gas Operator | May 2022 |
| 4347 | Standard Production | | Oil Operator | Oct 1997 |
| 4348 | Star Energy Inc | Dayton, PA 16222-4325 | Oil & Gas Operator | Dec 2023 |
| 4349 | Star Falcon Oil Co. | | Oil Operator | Feb 1986 |
| 4350 | Star Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1995 |
| 4351 | State Energy & Investment Inc. | | Oil & Gas Operator | Mar 1990 |
| 4352 | State Line Vacuum Services, LLC | | Oil Operator | Mar 2021 |
| 4353 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 4354 | Statoil Exploration (Us) Inc. | | Oil & Gas Operator | Jul 1997 |
| 4355 | Steaua Romana (Us) Inc. | | Oil & Gas Operator | Apr 1987 |
| 4356 | Stenco | | Oil & Gas Operator | Apr 1994 |
| 4357 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 4358 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2025 |
| 4359 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Mar 2025 |
| 4360 | Steveco | | Oil Operator | Feb 1984 |
| 4361 | Stewart Oil Company | | Oil Operator | Jun 2009 |
| 4362 | Stinhall Corporation | | Oil & Gas Operator | Apr 1989 |
| 4363 | Stinson Gas Company, L.L.C. | | Gas Operator | Jul 2018 |
| 4364 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 4365 | Stone Oil Corp & McMoran Expl | | Oil & Gas Operator | Oct 1984 |
| 4366 | Stone Oil Corp - Strata Energy | | Oil & Gas Operator | Mar 1982 |
| 4367 | Stone Oil Corp-Forest Oil Corp | | Oil & Gas Operator | Jan 1983 |
| 4368 | Stone Oil-Lamson-Onshore Pet. | | Oil & Gas Operator | May 1985 |
| 4369 | Stone Oil-Quasar-Birthright | | Oil & Gas Operator | Feb 1981 |
| 4370 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 4371 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Dec 2024 |
| 4372 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 4373 | Strahan Oil & Gas Co., Inc. | | Gas Operator | Oct 1983 |
| 4374 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 4375 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 4376 | Strata Energy, Inc. | | Oil & Gas Operator | Sep 1983 |
| 4377 | Strataform, Inc. | | Gas Operator | Jun 2002 |
| 4378 | Stratco Operating Co., Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 4379 | Strike Energy Corp | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2023 |
| 4380 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 4381 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 4382 | Stroud Operating LLC | | Oil & Gas Operator | Dec 2012 |
| 4383 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Mar 2025 |
| 4384 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4385 | STS Petroleum LLC | Houston, TX 77289 | Oil & Gas Operator | Mar 2025 |
| 4386 | Stuart Oil | | Oil Operator | Jan 2025 |
| 4387 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 4388 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |
| 4389 | Subsurface Resources Inc | Logan, UT 84321 | Oil & Gas Operator | Aug 1990 |
| 4390 | Suburban Propane Expl Co, Inc. | | Oil & Gas Operator | Jun 1983 |
| 4391 | Suburban Propane Gas Corp. | | Oil & Gas Operator | Sep 1980 |
| 4392 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Mar 2025 |
| 4393 | Sugar Bowl Gas Corp. | | Oil Operator | Dec 1983 |
| 4394 | Sugar Bowl Industrial Gas Corp | | Oil Operator | Dec 1983 |
| 4395 | Sugar Creek Environmental, LLC | | Oil Operator | Jan 2025 |
| 4396 | Sugar Creek Producing Company | | Oil & Gas Operator | Dec 2010 |
| 4397 | Sugar Creek Producing Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 4398 | Sugar Oil Company | | Oil & Gas Operator | Feb 2011 |
| 4399 | Sullivan Well Service | | Oil Operator | Mar 2010 |
| 4400 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 2025 |