| 501 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 502 | Reserve Oil & Gas, Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 503 | Riddle, William D | | Oil & Gas Operator | Dec 2021 |
| 504 | Ridgeland Energy, LLC | Pinch, WV 25156 | Oil & Gas Operator | Dec 2021 |
| 505 | Ritchie Petroleum Corporation, Inc. | Pennsboro, WV 26415-0000 | Oil & Gas Operator | Dec 2021 |
| 506 | Rockwell Resources Inc | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 507 | Rogers & Son | | Oil & Gas Operator | Dec 2008 |
| 508 | Rogers, M & Scull, David | | Oil & Gas Operator | Dec 2008 |
| 509 | Ross & Wharton Gas Co Inc | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 510 | Ross, Mike Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 511 | Rouzer Oil Company | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 512 | Royal Resources Corporation | | Oil & Gas Operator | Dec 2008 |
| 513 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Apr 2026 |
| 514 | Saglio, Inc. | Clay, WV 25043-0712 | Gas Operator | Dec 2021 |
| 515 | Sampson, Lowell | | Oil & Gas Operator | Dec 2001 |
| 516 | Sancho Oil & Gas LLC | | Oil & Gas Operator | Dec 2021 |
| 517 | Sardis Gas, LLC | Mineral Wells, WV 26150 | Oil & Gas Operator | Dec 2024 |
| 518 | Scarsdale Drilling Partners III LP | Scarsdale, NE 10583 | Oil & Gas Operator | Dec 2014 |
| 519 | SCD Oil Operators & Drilling Inc | Houston, TX 77069 | Oil & Gas Operator | Dec 2021 |
| 520 | Schultz Run Gas Company | | Oil & Gas Operator | Dec 2021 |
| 521 | Sears Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 522 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 523 | Shale Gas Production, LLC | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 524 | Shale Service, Inc. | | Oil & Gas Operator | Apr 2019 |
| 525 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 526 | Shewey, C. F., Agent | | Oil & Gas Operator | Dec 2008 |
| 527 | Sigma Corporation | Charleston, WV 25301-2644 | Gas Operator | Dec 2021 |
| 528 | Slaughter, Norman C. | | Oil & Gas Operator | Dec 2012 |
| 529 | Slone Energy, LLC | Oil Springs, KY 41238 | Oil & Gas Operator | Dec 2024 |
| 530 | Smith Land Surveying, Inc. Dba SLS Land & Energy Development | | Gas Operator | Dec 2021 |
| 531 | Smith, Carl E Petroleum Inc | Sandyville, WV 25275-0000 | Oil & Gas Operator | Dec 2021 |
| 532 | Smith, Walter E | Grantsville, WV 26147-0000 | Oil & Gas Operator | Dec 2021 |
| 533 | Solomon Production Corporation | Pullman, WV 26421-0003 | Oil & Gas Operator | Dec 2021 |
| 534 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 535 | Southeastern Gas Company | | Oil & Gas Operator | Dec 2019 |
| 536 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 537 | Spencer Enterprises Dba Hugh Spencer | Smithburg, WV 26436-0000 | Oil & Gas Operator | Dec 2021 |
| 538 | St. Clair Oil Co. | St Clairsville, OH 43950 | Oil & Gas Operator | Dec 1997 |
| 539 | Stalnaker Energy Corporation | | Oil & Gas Operator | Dec 2021 |
| 540 | Stalnaker, William K | | Oil & Gas Operator | Dec 2008 |
| 541 | Standard Oil Company, Inc. | Parkesburg, WV 26103 | Oil & Gas Operator | Mar 2022 |
| 542 | Status Oil Well, Inc. | Charlotte, NC 28270 | Oil & Gas Operator | Dec 2011 |
| 543 | Stephen L Satterfield Production Company | Grantsville, WV 26147-0757 | Oil & Gas Operator | Nov 2021 |
| 544 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 545 | Stonestreet, Vance | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2006 |
| 546 | Stowers Energy, LLC | Celebration, FL 34747 | Oil & Gas Operator | Dec 2021 |
| 547 | Strategic Well Holdings, Inc. | | Oil & Gas Operator | Dec 2020 |
| 548 | Stydahar Oil & Gas Co. | | Oil & Gas Operator | Dec 2021 |
| 549 | Subsurface Energy, Inc. | | Oil & Gas Operator | Oct 2015 |
| 550 | Sugar Rock Incorporated | | Oil & Gas Operator | Dec 2021 |
| 551 | Summit Appalachia Operating Company, LLC | | Gas Operator | Dec 2021 |
| 552 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 553 | SWN Production (Ohio), LLC | Spring, TX 77389 | Oil & Gas Operator | Mar 2024 |
| 554 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Dec 2025 |
| 555 | SWV Energy Operating LLC | Spring, TX 77379 | Gas Operator | Dec 2018 |
| 556 | Syndex Resources, Inc. | Wellesley, MA 02181-000 | Oil & Gas Operator | Dec 2021 |
| 557 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 558 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 559 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 560 | Tapo Energy, LLC | West Union, WV 26456 | Oil & Gas Operator | Dec 2021 |
| 561 | Targa Development, Inc. | Clarksburg, WV 26301-0000 | Oil & Gas Operator | Dec 2021 |
| 562 | Tate Gas Company | Glenville, WV 26351-0000 | Oil & Gas Operator | Dec 2021 |
| 563 | Taylor, W H | | Gas Operator | Dec 2004 |
| 564 | Teavee Oil & Gas, Inc. | Charleston, WV 25301-0000 | Oil & Gas Operator | Dec 2021 |
| 565 | Tedik Limited Partnership | Williamson, WV 25661-0000 | Gas Operator | Dec 2021 |
| 566 | Ten A Coal Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2020 |
| 567 | Tender Equity Corporation | Marietta, OH 45750 | Oil & Gas Operator | Dec 2007 |
| 568 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Jan 2026 |
| 569 | Tenmile Land Limited Liability Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 570 | Term Energy Corp. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2021 |
| 571 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 572 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 573 | The Glass Development Company | St. Marys, WV 26170-0000 | Oil & Gas Operator | Dec 2021 |
| 574 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 575 | Tiger Oil, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2007 |
| 576 | TNG, Inc. | | Oil & Gas Operator | Dec 1996 |
| 577 | Toney Branch Gas Company | Huntington, WV 25702-0086 | Gas Operator | Dec 2021 |
| 578 | Tower Drilling Corporation | | Oil & Gas Operator | Dec 2021 |
| 579 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 580 | Tri-County Oil & Gas, Inc. | Fairmont, WV 26555-0000 | Oil & Gas Operator | Dec 2019 |
| 581 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Feb 2026 |
| 582 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 583 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 584 | Tribune Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 585 | Trio Oil And Gas Company | Salem, WV 26426 | Oil & Gas Operator | Nov 2021 |
| 586 | Trio Petroleum Corp. | Glenville, WV 26351-0880 | Oil & Gas Operator | Jul 2016 |
| 587 | Trittipo, J. L. | | Oil & Gas Operator | Nov 1997 |
| 588 | Tucker, Gene | | Oil & Gas Operator | Dec 2011 |
| 589 | Tug Fork Development | Catlettsburg, KY 41129 | Gas Operator | Dec 2021 |
| 590 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 591 | Tuscany Gas Limited Liability Company | | Gas Operator | Dec 2021 |
| 592 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 593 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 594 | Underwood, Donald D. Dba Mustang Oil Co | Salem, WV 26426 | Oil & Gas Operator | Dec 2020 |
| 595 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 596 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 597 | United Petro LTD. | | Oil & Gas Operator | Dec 2018 |
| 598 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 599 | Us Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 600 | Vescal Corporation | Elizabeth, WV 26143-0000 | Oil & Gas Operator | Dec 2017 |