| 501 | Rako Operating Company | Fayetteville, AR 72701 | Oil & Gas Operator | Mar 2026 |
| 502 | Ram Oil & Gas | Blackwell, OK 74631 | Oil & Gas Operator | May 2013 |
| 503 | Ramey Oil Corporation | Kiefer, OK 74041-0699 | Oil & Gas Operator | Apr 2026 |
| 504 | Ramey Wayne | Mounds, OK 74047 | Oil & Gas Operator | Mar 2026 |
| 505 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 506 | Randy Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2026 |
| 507 | Raper Brice Oil Company LLC | Yale, OK 74085-6865 | Oil & Gas Operator | Apr 2015 |
| 508 | Ray Herman | Haskell, OK 74436-0446 | Oil & Gas Operator | Dec 2021 |
| 509 | Ray Randy S | Okmulgee, OK 74447-8534 | Oil & Gas Operator | Apr 2015 |
| 510 | Ray Roger T | Boynton, OK 74422 | Oil & Gas Operator | Dec 2021 |
| 511 | Ray'S Oil Company | Boynton, OK 74422 | Oil & Gas Operator | Mar 2026 |
| 512 | Red Buck Oil Company | Copan, OK 74022-0215 | Oil Operator | Nov 2009 |
| 513 | Red Fork Production, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2026 |
| 514 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 515 | Reddy Oil & Gas Corporation | Tulsa, OK 74108-5105 | Oil & Gas Operator | Mar 2026 |
| 516 | Regal Petroleum Services, Inc. | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 517 | Regency Petroleum Inc | Jones, OK 73049-8724 | Oil & Gas Operator | Mar 1999 |
| 518 | Relm Energy Inc | Morris, OK 74445-2227 | Oil & Gas Operator | Feb 2021 |
| 519 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 520 | Ret Oil Inc | Del City, OK 73115 | Oil & Gas Operator | Jan 2007 |
| 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 | Reynolds J W & Associates | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2000 |
| 524 | Rice Michael Lee | Beggs, OK 74421-2977 | Oil Operator | Jul 2025 |
| 525 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 526 | Rick Pulliam Oil & Gas Inc | Bristow, OK 74010 | Oil & Gas Operator | Mar 2026 |
| 527 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 528 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 529 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 530 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 531 | Roberts Herman | Henderson, NV 89014 | Oil Operator | Jul 2023 |
| 532 | Robertson Johnie J | Okmulgee, OK 74447-8765 | Oil & Gas Operator | Mar 2026 |
| 533 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 534 | Rockin D Resources LLC | Bristow, OK 74010-4162 | Oil Operator | Mar 2026 |
| 535 | Rockin D Ventures LLC | Morris, OK 74445 | Oil Operator | Mar 2026 |
| 536 | Rocking Chair Energy Partners LLC | Morris, OK 74445 | Oil & Gas Operator | Apr 2026 |
| 537 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 538 | Rocky Top Energy LLC | Bartlesville, OK 74003 | Oil & Gas Operator | Sep 2025 |
| 539 | Roe Oil Company | Cushing, OK 74023-0086 | Oil & Gas Operator | Nov 2025 |
| 540 | Rogers Dan R | Okemah, OK 74847 | Oil & Gas Operator | Apr 2020 |
| 541 | Rogers, Cora L | | Oil Operator | Mar 2026 |
| 542 | Rongey Ira E | Sapulpa, OK 74066-9317 | Oil & Gas Operator | May 2013 |
| 543 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 544 | Rose Dan And Bill | Henryetta, OK 74437 | Oil & Gas Operator | Apr 2026 |
| 545 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Mar 2026 |
| 546 | Ross Bobby L | Okmulgee, OK 74447-8802 | Oil & Gas Operator | Apr 2020 |
| 547 | Rowe Energy | Beggs, OK 74421-0240 | Oil & Gas Operator | Mar 2015 |
| 548 | Rowe Stephen Oil Properties LLC | Hunt, TX 78024 | Oil & Gas Operator | Apr 2020 |
| 549 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 550 | Royalty Energy Development LLC | Edmond, OK 73003 | Oil & Gas Operator | Apr 2026 |
| 551 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Feb 2026 |
| 552 | Russell Carl G | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 553 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Mar 2026 |
| 554 | S & K Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jul 1994 |
| 555 | Sackett James B | Hanna, OK 74845 | Oil Operator | Mar 2026 |
| 556 | Sam W Mays Jr LLC | Eureka, KS 67045 | Oil & Gas Operator | Apr 2018 |
| 557 | Samuel Joe L | Tulsa, OK 74135-7805 | Oil & Gas Operator | Jan 2001 |
| 558 | Sanford & Jenkins | Henryetta, OK 74437-1411 | Oil & Gas Operator | Mar 2015 |
| 559 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 560 | Sedna Energy LLC | Blanchard, OK 73010-8043 | Gas Operator | Apr 2017 |
| 561 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 562 | Sellers O N | Henryetta, OK 74437 | Oil & Gas Operator | May 1997 |
| 563 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 564 | Semper Fidelis Oil & Gas, LLC | Allen, TX 75013 | Oil & Gas Operator | Apr 2013 |
| 565 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Apr 2026 |
| 566 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 567 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 568 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 569 | Shadow-Del Oil Company | Kiefer, OK 74041-0453 | Oil & Gas Operator | Jul 2015 |
| 570 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 571 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | Mar 2026 |
| 572 | Shanks Robert "Bob" | Haskell, OK 74436-8809 | Oil & Gas Operator | Jun 2023 |
| 573 | Shannon Corporation Inc | Okmulgee, OK 74447-1323 | Oil & Gas Operator | Mar 2015 |
| 574 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 575 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 576 | Shelton Alec & Glenda | Kiefer, OK 74041 | Oil & Gas Operator | Aug 2025 |
| 577 | Shelton Brothers | Okmulgee, OK 74447-6110 | Oil & Gas Operator | Apr 2020 |
| 578 | Shepard James | Beggs, OK 74421 | Oil & Gas Operator | Feb 2024 |
| 579 | Sherrill Bob G | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2015 |
| 580 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 581 | Shiloh E Hall | Okmulgee, OK 74447 | Oil Operator | Mar 2026 |
| 582 | Shockley Jimmie D | Morris, OK 74445-2754 | Oil Operator | Apr 2026 |
| 583 | Sicko Jaquetta Len | Muldoon, TX 78949 | Oil Operator | Mar 2026 |
| 584 | Silverado Oil LTD | Ardmore, OK 73401 | Oil & Gas Operator | Jun 2003 |
| 585 | Silvertin Farm Production LLC | Poteau, OK 74953 | Oil & Gas Operator | Apr 2020 |
| 586 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 587 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 588 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 589 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 590 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 591 | Smith Bart Oil & Gas Expl Inc | Council Hill, OK 74428-9603 | Oil & Gas Operator | Apr 2015 |
| 592 | Smith Bob W | Ardmore, OK 73403-5214 | Oil & Gas Operator | Sep 2014 |
| 593 | Smith Claude W | Henryetta, OK 74437-7553 | Oil Operator | May 2008 |
| 594 | Smith Joyce | Okmulgee, OK 74447-6074 | Oil Operator | Mar 2025 |
| 595 | Smith Richard L | Catoosa, OK 74015 | Oil & Gas Operator | Dec 2019 |
| 596 | Smith Vernon C | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2025 |
| 597 | Smither Energy Co LLC | Broken Arrow, OK 74011-7615 | Oil & Gas Operator | Nov 2020 |
| 598 | Snake Creek Oil & Gas Inc | Okmulgee, OK 74447-2041 | Oil & Gas Operator | Dec 2025 |
| 599 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 600 | Sooner Pipe & Supply Corp | | Oil & Gas Operator | Nov 2004 |