| 501 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 502 | Quail Creek Petro MGMT Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 503 | Quanah Company | Tulsa, OK 74159-0469 | Oil & Gas Operator | May 2020 |
| 504 | R Baker Oil LLC | Okemah, OK 74859 | Oil & Gas Operator | Mar 2026 |
| 505 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 506 | R K R Exploration | Seminole, OK 74868-9754 | Oil & Gas Operator | Mar 2015 |
| 507 | Rako Operating Company | Fayetteville, AR 72701 | Oil & Gas Operator | Feb 2026 |
| 508 | Ramey Oil Corporation | Kiefer, OK 74041-0699 | Oil & Gas Operator | Feb 2026 |
| 509 | Ramey Wayne | Mounds, OK 74047 | Oil & Gas Operator | Feb 2026 |
| 510 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 511 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 512 | Rawhide Oil Company | | Oil & Gas Operator | Sep 2011 |
| 513 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2026 |
| 514 | Red Fork Oil Co | Lakewood, CO 80215 | Oil & Gas Operator | Aug 1993 |
| 515 | Red Fork Production, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 516 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jun 2026 |
| 517 | Reed Power Tongs Inc | Seminole, OK 74818 | Oil & Gas Operator | Sep 2025 |
| 518 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 519 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2026 |
| 520 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 521 | Revilo Exploration LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2020 |
| 522 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 523 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 524 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Mar 2026 |
| 525 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 526 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 527 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 528 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 529 | Rogers Dan R | Okemah, OK 74847 | Oil & Gas Operator | Apr 2020 |
| 530 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 531 | Rose Dan And Bill | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2026 |
| 532 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 533 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Feb 2026 |
| 534 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 535 | Roth Gary E | Tonkawa, OK 74653-2033 | Oil & Gas Operator | Jan 2020 |
| 536 | Rowe Energy | Beggs, OK 74421-0240 | Oil & Gas Operator | Mar 2015 |
| 537 | Rowe Stephen Oil Properties LLC | Hunt, TX 78024 | Oil & Gas Operator | Apr 2020 |
| 538 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 539 | S & S Oil & Gas Corporation | Okemah, OK 74859-0659 | Oil & Gas Operator | Sep 2014 |
| 540 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Jun 2026 |
| 541 | Samuel Joe L | Tulsa, OK 74135-7805 | Oil & Gas Operator | Jan 2001 |
| 542 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Jan 2026 |
| 543 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 544 | Seahawk Oil International Inc | Newport Beach, CA 92660 | Oil & Gas Operator | Oct 1997 |
| 545 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 546 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Feb 2026 |
| 547 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 548 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 549 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 550 | Shelton Dempsey W | Tulsa, OK 74119-4036 | Oil & Gas Operator | Mar 2015 |
| 551 | Shepard James | Beggs, OK 74421 | Oil & Gas Operator | Feb 2024 |
| 552 | Sherman Oil & Gas Co Inc | Chandler, OK 74834-0571 | Oil & Gas Operator | Apr 2020 |
| 553 | Sherman Oil & Gas, L.L.C. | Chandler, OK 74834 | Oil & Gas Operator | Mar 2026 |
| 554 | Sherrill Bob G | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2015 |
| 555 | Shideler Enterprises Inc | Drumright, OK 74030 | Oil & Gas Operator | Feb 2019 |
| 556 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 557 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2026 |
| 558 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 559 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 560 | Slavens II Paul R | Tulsa, OK 74131 | Oil & Gas Operator | Feb 2026 |
| 561 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 562 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 563 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Feb 2026 |
| 564 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 565 | Smith Terry | Wewoka, OK 74884 | Oil & Gas Operator | Mar 2015 |
| 566 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 567 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 568 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 569 | Sopac Exploration Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 1993 |
| 570 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 571 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 572 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 573 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | Mar 2026 |
| 574 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Mar 2026 |
| 575 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | Feb 2026 |
| 576 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2026 |
| 577 | Sperry R J | Dallas, TX 75254-8647 | Oil & Gas Operator | Aug 2013 |
| 578 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Mar 2026 |
| 579 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 580 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 581 | Stargas Co | Tulsa, OK 74136-5407 | Oil & Gas Operator | Aug 2013 |
| 582 | Stokes Donna L | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2023 |
| 583 | Stover Company | Tulsa, OK 74152-0786 | Oil & Gas Operator | Jan 2013 |
| 584 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 585 | Striker Management Co LLC | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2026 |
| 586 | Sturman Jay R | Mounds, OK 74047 | Oil & Gas Operator | Aug 2025 |
| 587 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 588 | Sunland Enterprises Corp | Norman, OK 73071 | Oil Operator | Sep 2004 |
| 589 | Swadley Et Al | Holdenville, OK 74848-0794 | Oil & Gas Operator | Nov 2014 |
| 590 | Swadley Roy W & Judith I | Holdenville, OK 74848-0794 | Oil & Gas Operator | Mar 2015 |
| 591 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 592 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 593 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Jun 2026 |
| 594 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2026 |
| 595 | Tarwater Oil & Gas LLC | San Jose, CA 95128-4219 | Oil & Gas Operator | Dec 2023 |
| 596 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 597 | Taylor International Inc | Drumright, OK 74030-1173 | Oil & Gas Operator | Mar 2020 |
| 598 | Tcina Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2023 |
| 599 | Terra Production Company | Okemah, OK 74859-5924 | Oil & Gas Operator | Apr 2020 |
| 600 | Terrapin Energy LLC | Okmulgee, OK 74447 | Oil Operator | Mar 2026 |