| 4401 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 4402 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 4403 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 4404 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Nov 2025 |
| 4405 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 4406 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 4407 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 4408 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 4409 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 4410 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 4411 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 4412 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 4413 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 4414 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 4415 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 4416 | Southwest Gas Producing Co Inc | | Oil & Gas Operator | Nov 1994 |
| 4417 | Southwest General Dev., Inc. | | Oil & Gas Operator | Dec 2003 |
| 4418 | Southwest Ind Investment Co | | Gas Operator | Oct 1983 |
| 4419 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 4420 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 4421 | Southwest Rig Service | | Oil & Gas Operator | Nov 1998 |
| 4422 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 4423 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 4424 | Southwind Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 4425 | Sovereign Energy Corp. | | Oil Operator | Dec 2001 |
| 4426 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 4427 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 4428 | Spartan Royalties, LLC | | Oil Operator | Dec 2024 |
| 4429 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2026 |
| 4430 | Speco Oil Company | | Oil & Gas Operator | Feb 1980 |
| 4431 | Spectrum Opco LLC | | Oil & Gas Operator | Nov 2024 |
| 4432 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 4433 | Spillers Petroleum, Inc. | | Gas Operator | Mar 2010 |
| 4434 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Feb 2026 |
| 4435 | Spingas Energy, Inc. | | Oil & Gas Operator | Jun 2010 |
| 4436 | Spirit Petroleum Company | | Oil & Gas Operator | Apr 1999 |
| 4437 | Spokane Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 4438 | Spooner & Marlin Expl., Inc. | | Oil & Gas Operator | Mar 1990 |
| 4439 | Spooner Petroleum Company | | Oil & Gas Operator | Dec 2025 |
| 4440 | Spyglass Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 4441 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 4442 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 4443 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 4444 | Ssi Energy LLC | | Oil & Gas Operator | Jul 2021 |
| 4445 | SSM Partnership-PV79 | | Oil Operator | Jun 1989 |
| 4446 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 4447 | St. Croix Corporation | | Oil & Gas Operator | Apr 1990 |
| 4448 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 4449 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 4450 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 4451 | St. Paul Oil And Gas Corp. | | Oil & Gas Operator | Aug 1991 |
| 4452 | Stallion Oil Corporation | | Oil & Gas Operator | Nov 1987 |
| 4453 | Stanco Petroleum Inc | Kimball, NE 69145 | Oil & Gas Operator | Jul 1999 |
| 4454 | Standard Operating Company, LLC | | Oil & Gas Operator | May 2022 |
| 4455 | Standard Production | | Oil Operator | Oct 1997 |
| 4456 | Star Energy Inc | Dayton, PA 16222-4325 | Oil & Gas Operator | Dec 2025 |
| 4457 | Star Falcon Oil Co. | | Oil Operator | Feb 1986 |
| 4458 | Star Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1995 |
| 4459 | State Energy & Investment Inc. | | Oil & Gas Operator | Mar 1990 |
| 4460 | State Line Vacuum Services, LLC | | Oil Operator | Mar 2021 |
| 4461 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 4462 | Statoil Exploration (Us) Inc. | | Oil & Gas Operator | Jul 1997 |
| 4463 | Steaua Romana (Us) Inc. | | Oil & Gas Operator | Apr 1987 |
| 4464 | Stenco | | Oil & Gas Operator | Apr 1994 |
| 4465 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 4466 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 4467 | Sterlington Memorial Hospital | | Gas Operator | Jan 2005 |
| 4468 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Feb 2026 |
| 4469 | Steveco | | Oil Operator | Feb 1984 |
| 4470 | Stewart Oil Co. | | Oil Operator | Jun 2009 |
| 4471 | Stinhall Corporation | | Oil & Gas Operator | Apr 1989 |
| 4472 | Stinson Gas Company, L.L.C. | | Gas Operator | Jul 2018 |
| 4473 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 4474 | Stone Oil Corp & McMoran Expl | | Oil & Gas Operator | Oct 1984 |
| 4475 | Stone Oil Corp - Strata Energy | | Oil & Gas Operator | Mar 1982 |
| 4476 | Stone Oil Corp-Forest Oil Corp | | Oil & Gas Operator | Jan 1983 |
| 4477 | Stone Oil-Lamson-Onshore Pet. | | Oil & Gas Operator | May 1985 |
| 4478 | Stone Oil-Quasar-Birthright | | Oil & Gas Operator | Feb 1981 |
| 4479 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 4480 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 4481 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 4482 | Strahan Oil & Gas Co., Inc. | | Gas Operator | Oct 1983 |
| 4483 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 4484 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 4485 | Strata Energy, Inc. | | Oil & Gas Operator | Sep 1983 |
| 4486 | Strataform, Inc. | | Gas Operator | Jun 2002 |
| 4487 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 4488 | Strike Energy Corporation | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2023 |
| 4489 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 4490 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 4491 | Stroud Operating LLC | | Oil & Gas Operator | Dec 2012 |
| 4492 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Feb 2026 |
| 4493 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4494 | STS Petroleum LLC | Houston, TX 77289 | Oil & Gas Operator | Feb 2026 |
| 4495 | Stuart Oil | | Oil Operator | Jan 2025 |
| 4496 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 4497 | Sturlese-Dupre Exploration Co | | Oil & Gas Operator | Aug 1994 |
| 4498 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |
| 4499 | Subsurface Resources Inc | Logan, UT 84321 | Oil & Gas Operator | Aug 1990 |
| 4500 | Suburban Prop Corp. & May Pet. | | Gas Operator | Oct 1980 |