| 601 | R & N Oil Company | Fairfax, OK 74637 | Oil & Gas Operator | May 2013 |
| 602 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 603 | R & R Operating | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2004 |
| 604 | R B Energy Inc | Manchester, KY 40962 | Oil & Gas Operator | Jan 2015 |
| 605 | R C Oil Company Inc | Nowata, OK 74048-3402 | Oil Operator | Nov 2021 |
| 606 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 607 | R L Turner Oil Company LLC | Duncan, OK 73533 | Oil Operator | Jun 2026 |
| 608 | R M Oil & Gas Co | | Oil Operator | Jul 1999 |
| 609 | Rainbow Oil & Gas | Pawhuska, OK 74056-0056 | Oil Operator | Oct 2010 |
| 610 | Rainbow Oil & Gas LLC | Coolville, OH 45723 | Oil & Gas Operator | Dec 2025 |
| 611 | Rainbow Oil Company | | Oil & Gas Operator | Aug 1999 |
| 612 | Rainbow Oilwell Service Inc | Depew, OK 74028 | Oil & Gas Operator | Jul 2024 |
| 613 | Ralph Dawson | | Oil Operator | Nov 2005 |
| 614 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 615 | Rawhide Operating, Inc. | New Braunfels, TX 78131 | Oil & Gas Operator | Sep 2026 |
| 616 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 617 | Redhen Oil Company | Oklahoma City, OK 73135 | Oil & Gas Operator | Sep 2024 |
| 618 | Reeves Harold D | | Oil & Gas Operator | Apr 1992 |
| 619 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Mar 2026 |
| 620 | Revard Oil And Gas Properties Inc | | Oil & Gas Operator | Jun 2026 |
| 621 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 622 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 623 | Robbins Thomas D & Charlene A Revocable Trust | Plano, TX 75093-7471 | Oil Operator | Jul 2018 |
| 624 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 625 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Jul 2026 |
| 626 | Robert H & Layna Plummer Rev Intervivios Trust | | Oil Operator | Jul 2018 |
| 627 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 628 | Robinson, Gary D | | Oil Operator | Apr 2026 |
| 629 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 630 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 631 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 632 | Rougeot Oil & Gas Corp | Sperry, OK 74073 | Oil & Gas Operator | Jun 2026 |
| 633 | Rountree Productions LLC | | Oil Operator | Jun 2026 |
| 634 | Royal Energy Resources LTD | Denver, CO 80221 | Oil & Gas Operator | May 2013 |
| 635 | Rozen H H | | Oil Operator | Aug 2022 |
| 636 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 637 | S & M Production Inc | Pawnee, OK 74058 | Oil & Gas Operator | Aug 2023 |
| 638 | S & S Oil & Gas LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jul 2016 |
| 639 | S J Murphy Oil And Gas Inc | | Oil & Gas Operator | Jun 2026 |
| 640 | Safire Resources LLC (Osage Only) | | Oil & Gas Operator | Jun 2026 |
| 641 | Sallee Oil Corporation | Collinsville, OK 74021 | Oil & Gas Operator | Jun 2026 |
| 642 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 643 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2026 |
| 644 | Sand Boy Production Company | Bartlesville, OK 74003-9273 | Oil & Gas Operator | Apr 2026 |
| 645 | Sand Springs Oil & Gas Co. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2026 |
| 646 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 647 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 648 | Schroeder, Donald C | | Oil & Gas Operator | May 2026 |
| 649 | Schuler Jr Chris C | Cleveland, OK 74020 | Oil Operator | Aug 2013 |
| 650 | Schuler Oil Properties LLC | Cleveland, OK 74020 | Oil Operator | Jun 2026 |
| 651 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Jul 2026 |
| 652 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 653 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 654 | Sell Drilling LLC | | Oil Operator | Feb 2011 |
| 655 | Sell Well Servicing Company Osage Only | | Oil & Gas Operator | Nov 2019 |
| 656 | Sell, David E | | Oil Operator | Jun 2026 |
| 657 | Sellers Jack B Estate Of | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2026 |
| 658 | Senax Inc | Tulsa, OK 74105-2206 | Oil & Gas Operator | Jun 2026 |
| 659 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Sep 2026 |
| 660 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 661 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 662 | Shamrock Operating Company LLC | Cleveland, OK 74020 | Oil Operator | Aug 2022 |
| 663 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jul 2026 |
| 664 | Sharp Anthony G | Shawnee, OK 74802-1701 | Oil & Gas Operator | Jul 2003 |
| 665 | Sheets George M & Judith A | Tonkawa, OK 74653 | Oil & Gas Operator | Jun 2026 |
| 666 | Shelton Alec & Glenda | Kiefer, OK 74041 | Oil & Gas Operator | May 2026 |
| 667 | Short Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 668 | Silberman A & M Oil | Oklahoma City, OK 73122-3096 | Oil & Gas Operator | Apr 2014 |
| 669 | Silent Stone Energy LLC | | Oil & Gas Operator | Jun 2026 |
| 670 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 671 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 672 | Skull Creek Oil & Gas LLC | | Oil Operator | Apr 2026 |
| 673 | Slinkard, Roberta S | | Oil Operator | Jun 2026 |
| 674 | Slone, VIctor R | | Oil Operator | Jun 2026 |
| 675 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2026 |
| 676 | Smith & Smith Petroleum Corp | | Oil & Gas Operator | May 2026 |
| 677 | Smith Bradley D & Paul C | Pawhuska, OK 74056 | Oil Operator | Jun 2026 |
| 678 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 679 | Smith Doug | Tulsa, OK 74107 | Oil & Gas Operator | Feb 2016 |
| 680 | Smith Petroleum LLC | Barnsdall, OK 74002-0134 | Oil Operator | Jun 2026 |
| 681 | Smith, William M | | Oil & Gas Operator | Oct 2025 |
| 682 | Sneed Drilling Company | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2026 |
| 683 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Jun 2026 |
| 684 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 685 | Sooner Pipe & Supply Corp | | Oil & Gas Operator | Nov 2004 |
| 686 | Southland Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2022 |
| 687 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Jun 2026 |
| 688 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Jul 2026 |
| 689 | Spears Terry | Osage, OK 74054 | Oil Operator | May 2026 |
| 690 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Jun 2026 |
| 691 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jul 2026 |
| 692 | Spurgeon William Allan | Nowata, OK 74048-9713 | Oil Operator | Feb 2010 |
| 693 | Spurgeon William C & Tammy D | Hominy, OK 74035 | Oil & Gas Operator | Jun 2026 |
| 694 | SRW Operating LLC | Duncan, OK 73534-2087 | Oil & Gas Operator | Sep 2014 |
| 695 | Staats & Martin | | Oil Operator | Aug 2013 |
| 696 | Staats, William N | | Oil & Gas Operator | Jun 2026 |
| 697 | Stanton Leo F & Leo H | Wynona, OK 74084 | Oil & Gas Operator | Jun 1999 |
| 698 | Stanton, Joni R | | Oil Operator | Jun 2026 |
| 699 | Sterling Oil Of Okla Inc | Tulsa, OK 74170-2163 | Oil & Gas Operator | Nov 2006 |
| 700 | Stevenson Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |