| 601 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2024 |
| 602 | Oxco LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Feb 2015 |
| 603 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 604 | Pacific Phoenix Inc | Bartlesville, OK 74005 | Oil & Gas Operator | Jun 1998 |
| 605 | Pan Petroleum MLP | Kansas City, MO 64114 | Oil & Gas Operator | Aug 1997 |
| 606 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 607 | Park Kenneth Y | Skiatook, OK 74070-6060 | Oil & Gas Operator | Dec 2023 |
| 608 | Park William M | Skiatook, OK 74070-0718 | Oil & Gas Operator | Jan 2024 |
| 609 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 610 | Parker James A | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2024 |
| 611 | Parks Jack Concrete Co | Hominy, OK 74035 | Oil Operator | Jan 2024 |
| 612 | Parsage Oil Co | Tulsa, OK 74170 | Oil Operator | Jan 2024 |
| 613 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 614 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 615 | Patrick Exploration Company | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 616 | Payne Frank | Shidler, OK 74652 | Oil & Gas Operator | Dec 2014 |
| 617 | Paystone Oil Corporation | Tulsa, OK 74105 | Oil Operator | Mar 2009 |
| 618 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 619 | Pe Osage LLC | | Oil Operator | Jan 2024 |
| 620 | Pease George W Jr | Fairfax, OK 74637 | Oil & Gas Operator | Mar 1998 |
| 621 | Pedestal Oil Company Inc | Oklahoma City, OK 73101-1522 | Oil & Gas Operator | May 2019 |
| 622 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 623 | Pemco LLC | Skiatook, OK 74070-4018 | Oil Operator | Feb 2023 |
| 624 | Pemex Inc | Dallas, TX 75367-0249 | Oil & Gas Operator | Nov 2015 |
| 625 | Performance Energy Partners LLC | Barnsdall, OK 74002-0628 | Oil & Gas Operator | Oct 2023 |
| 626 | Performance Operating Company LLC | | Oil & Gas Operator | Jan 2024 |
| 627 | Performance Petroleum Company LLC | Barnsdall, OK 74002-0628 | Oil & Gas Operator | Jan 2024 |
| 628 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | Feb 2024 |
| 629 | Perrin, Mary L | | Oil & Gas Operator | Oct 2005 |
| 630 | Petrogas Exploration Inc | | Oil Operator | Jan 2024 |
| 631 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 632 | Petroleum Properties Co Inc | Tulsa, OK 74132-4010 | Oil & Gas Operator | Sep 2012 |
| 633 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 634 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 635 | Petromerica Operating LLC | | Oil Operator | Jan 2024 |
| 636 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | May 2024 |
| 637 | PHD Oil & Gas Inc | Rush Springs, OK 73082-0218 | Oil & Gas Operator | May 2021 |
| 638 | Phillips, Warren P | | Oil & Gas Operator | Apr 2011 |
| 639 | Phoenix Hydrocarbons Operating Co | Midland, TX 79702-3638 | Oil & Gas Operator | Jul 2018 |
| 640 | Pierce Oil Company | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2017 |
| 641 | Pinnacle Corporation (The) | Broken Arrow, OK 74012 | Oil & Gas Operator | Nov 2014 |
| 642 | Pinnacle Operating Company LLC | Tulsa, OK 74137-4248 | Oil & Gas Operator | Jan 2024 |
| 643 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | May 2024 |
| 644 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 645 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 646 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 647 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 648 | Plenergy Dev LTD | | Oil & Gas Operator | Jun 2004 |
| 649 | Plummer Robert Layna Trust | | Oil Operator | Jul 2018 |
| 650 | Post Oak Petroleum LLC | | Oil Operator | Jan 2024 |
| 651 | Powell James S | | Oil Operator | Jan 2024 |
| 652 | Presco Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2020 |
| 653 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 654 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 655 | Pringle Operating Co. | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2015 |
| 656 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 657 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 658 | Putnam Phyllis L | Bartlesville, OK 74006-7326 | Oil & Gas Operator | May 2021 |
| 659 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 660 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Jan 2024 |
| 661 | Quench Oil & Gas Inc | Plano, TX 75075-2902 | Oil & Gas Operator | Apr 2009 |
| 662 | R & N Oil Company | Fairfax, OK 74637 | Oil & Gas Operator | May 2013 |
| 663 | R & R Oil Company | Pampa, TX 79065 | Oil & Gas Operator | Jul 2002 |
| 664 | R & R Operating | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2004 |
| 665 | R B Energy, Inc | Manchester, KY 40962 | Oil & Gas Operator | Jan 2015 |
| 666 | R C Oil Company Inc | Nowata, OK 74048-3402 | Oil Operator | Nov 2021 |
| 667 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 668 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 669 | R L Turner Oil Company LLC | Duncan, OK 73533 | Oil Operator | Feb 2024 |
| 670 | Rainbow Oil & Gas | Pawhuska, OK 74056-0056 | Oil Operator | Oct 2010 |
| 671 | Rainbow Oil & Gas LLC | Coolville, OH 45723 | Oil & Gas Operator | May 2023 |
| 672 | Rainbow Oil Company | | Oil & Gas Operator | Aug 1999 |
| 673 | Rainbow Oilwell Service Inc | Depew, OK 74028-0087 | Oil & Gas Operator | Mar 2023 |
| 674 | Ralph Dawson | | Oil Operator | Nov 2005 |
| 675 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 676 | Rawhide Operating, Inc. | New Braunfels, TX 78131 | Oil & Gas Operator | May 2024 |
| 677 | Red Creek Oil Co | | Oil & Gas Operator | Jun 1995 |
| 678 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 679 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 680 | Redcord C R | Louisville, KY 40243 | Oil Operator | Jan 2024 |
| 681 | Redhen Oil Company | Oklahoma City, OK 73155-5449 | Oil & Gas Operator | Feb 2024 |
| 682 | Reeves Harold D | | Oil & Gas Operator | Apr 1992 |
| 683 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Jan 2024 |
| 684 | Rennick Henry | Pawhuska, OK 74056 | Oil Operator | Dec 2023 |
| 685 | Revard Oil & Gas Properties Inc | | Oil & Gas Operator | Jan 2024 |
| 686 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 687 | RM Oil & Gas Co | Pawhuska, OK 74056 | Oil Operator | Jul 1999 |
| 688 | Roadrunner Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 689 | Robbins Thomas D & Charlene A Revocable Trust | Plano, TX 75093-7471 | Oil Operator | Jul 2018 |
| 690 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 691 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 692 | Robinson Gary | Wynona, OK 74084 | Oil Operator | Oct 2023 |
| 693 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 694 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 695 | Rongey Oil | Jenks, OK 74037-3621 | Oil & Gas Operator | Jan 2013 |
| 696 | Rougeot Oil & Gas Corp | Sperry, OK 74073 | Oil & Gas Operator | Jan 2024 |
| 697 | Rountree Productions LLC | | Oil Operator | Jan 2024 |
| 698 | Royal Energy Resources LTD | Denver, CO 80221 | Oil & Gas Operator | May 2013 |
| 699 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 700 | Rozen H H | | Oil Operator | Aug 2022 |