| 20601 | Oilton Petroleum Inc | Oilton, OK 74052-0459 | Oil & Gas Operator | Oct 2001 |
| 20602 | Oilton Resources, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Jun 2026 |
| 20603 | Oilwell Acquisition Co | | Oil & Gas Operator | Jun 1999 |
| 20604 | Oilwell Operators, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jun 2026 |
| 20605 | Oily Dog Operators Texas, LLC | Allen, TX 75002 | Oil Operator | Jun 2026 |
| 20606 | Ojai Oil Company | Camarillo, CA 93012 | Oil & Gas Operator | Dec 2025 |
| 20607 | Ojb, Inc. | Buda, TX 78610 | Oil & Gas Operator | Mar 2013 |
| 20608 | Ojt, LLC | Richmond, TX 77469 | Oil Operator | Jun 2026 |
| 20609 | Ok Arena Operating Company | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2026 |
| 20610 | Ok Oil Company, Inc. | Bivins, TX 75555 | Oil & Gas Operator | Feb 2013 |
| 20611 | Ok Operating Co | Midland, TX 79702 | Oil & Gas Operator | Aug 1999 |
| 20612 | Ok Production Services Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Mar 2026 |
| 20613 | Ok-La-Tex Production, Inc. | | Oil & Gas Operator | Jan 1982 |
| 20614 | Okc Energy Corporation | Oklahoma City, OK 73120-3119 | Oil & Gas Operator | Nov 2014 |
| 20615 | Okemah Production Inc | | Oil Operator | Dec 2005 |
| 20616 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 20617 | Okie Oil Inc | Sapulpa, OK 74067-0290 | Oil & Gas Operator | Mar 2011 |
| 20618 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 20619 | Okkatahula, Inc. | | Oil Operator | Nov 1978 |
| 20620 | Okla Sub-Surface Pump & Supply Co | Ada, OK 74820 | Oil & Gas Operator | Sep 2024 |
| 20621 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 20622 | Oklahoma Arrowhead Energy, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 1996 |
| 20623 | Oklahoma Basic Economy Corp | Houston, TX 77002-6003 | Oil & Gas Operator | Apr 2020 |
| 20624 | Oklahoma Cellulose Inc | Cleveland, OK 74020 | Oil Operator | Mar 2026 |
| 20625 | Oklahoma Crude Inc | Morris, OK 74445 | Oil & Gas Operator | Feb 2026 |
| 20626 | Oklahoma Crude Reclaimers, LLC | | Oil Operator | Mar 2026 |
| 20627 | Oklahoma Ea II, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2004 |
| 20628 | Oklahoma Energy & Exploration, Inc. | Tulsa, OK 74114 | Oil Operator | Jan 1996 |
| 20629 | Oklahoma Energy Acquisitions LP | Houston, TX 77094-1900 | Oil & Gas Operator | Feb 2026 |
| 20630 | Oklahoma Energy Exchange LLC | Duncan, OK 73534-1105 | Oil & Gas Operator | Sep 2012 |
| 20631 | Oklahoma Energy LLC | Skiatook, OK 74070-3998 | Oil Operator | Apr 2025 |
| 20632 | Oklahoma Equipment & Salvage | Oklahoma City, OK 73120-5903 | Oil & Gas Operator | Mar 2015 |
| 20633 | Oklahoma Gas & Oil Corp | | Oil Operator | Oct 2018 |
| 20634 | Oklahoma Liquid Resources Inc | Collinsville, OK 74021 | Oil & Gas Operator | Feb 2026 |
| 20635 | Oklahoma Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2020 |
| 20636 | Oklahoma Natural Resources Inc | Woodward, OK 73801 | Oil & Gas Operator | Sep 1996 |
| 20637 | Oklahoma O & G Royalties Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2000 |
| 20638 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Feb 2026 |
| 20639 | Oklahoma Oil And Gas Resources LLC | Guthrie, OK 73044-8095 | Oil & Gas Operator | Mar 2026 |
| 20640 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 20641 | Oklahoma Oil Tactics Inc | Edmond, OK 73003-1351 | Oil & Gas Operator | Mar 2015 |
| 20642 | Oklahoma Operating Company | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 20643 | Oklahoma Operating, LLC | Holliday, TX 76366 | Oil Operator | Nov 2003 |
| 20644 | Oklahoma Petroleum MGMT Corp | Tulsa, OK 74119 | Oil & Gas Operator | Jun 1993 |
| 20645 | Oklahoma Prime Energy LLC | Ardmore, OK 73401 | Oil Operator | May 2020 |
| 20646 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 20647 | Oklahoma Rig & Salvage Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 20648 | Oklahoma SWD Systems Inc | Odessa, TX 79762-8132 | Oil & Gas Operator | Feb 2026 |
| 20649 | Oklahoma Tank Service Inc | Oklahoma City, OK 73143 | Oil Operator | Aug 1997 |
| 20650 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Mar 2026 |
| 20651 | Oklaoleum Oil And Gas Inc | Bristow, OK 74010-0057 | Oil Operator | Jan 2016 |
| 20652 | Oklatex Energy, Inc. | Beaumont, TX 77702 | Oil Operator | Jun 2026 |
| 20653 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 20654 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 20655 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Jun 2026 |
| 20656 | Okt Petroleum Company Inc | Oklahoma City, OK 73118-7425 | Oil & Gas Operator | Oct 2013 |
| 20657 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 20658 | Oktex Operating LLC | Edmond, OK 73013-1961 | Oil & Gas Operator | May 2020 |
| 20659 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 20660 | Ol' Boys Operations LLC | Pampa, TX 79065 | Oil & Gas Operator | Jun 2026 |
| 20661 | Ol' Oily LLC | | Oil Operator | Feb 2026 |
| 20662 | Old Acres Farm, Inc. | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 20663 | Old Cedron, L.L.C. | Lubbock, TX 79410 | Oil & Gas Operator | May 2004 |
| 20664 | Old Chief Oil, LLC | San Antonio, TX 78205 | Oil Operator | Jun 2026 |
| 20665 | Old Dominion Oil Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2009 |
| 20666 | Old Field Associates | | Oil & Gas Operator | Mar 2026 |
| 20667 | Old MTN Gas Co Inc | Pleasantville, PA 16341-0329 | Oil & Gas Operator | Dec 2020 |
| 20668 | Old Pine Energy Corporation | Austin, TX 78755 | Oil Operator | Jun 2026 |
| 20669 | Old South Oil LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 20670 | Old Timers Oil | Saratoga, TX 77585 | Oil & Gas Operator | Nov 2014 |
| 20671 | Old Timers Oil Company, LLC | Saratoga, TX 77585 | Oil Operator | Aug 2022 |
| 20672 | Old Timers Oil No. 2 Incorporated | Saratoga, TX 77585 | Oil Operator | Jun 2026 |
| 20673 | Old Union Operating Company | Austin, TX 78716 | Oil & Gas Operator | Jun 2026 |
| 20674 | Olde Chautauqua Farms | Portland, NY 14769 | Gas Operator | Dec 2024 |
| 20675 | Older Than Dirt LLC | Weatherford, TX 76086 | Oil & Gas Operator | Jun 2026 |
| 20676 | Oldfield Acquisition LP | Austin, TX 78733 | Oil & Gas Operator | Sep 1996 |
| 20677 | Oldfield Operating Corporation | | Oil Operator | Dec 2013 |
| 20678 | Olds Oil Company | Casper, WY 82604 | Oil Operator | Jun 1988 |
| 20679 | Ole Chaparral On Possum Kingdom | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1997 |
| 20680 | Ole Crow Operating | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 20681 | Ole Miss Oil & Gas Inc | New Bremen, OH 45689 | Oil & Gas Operator | Dec 1985 |
| 20682 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 20683 | Oleksandr Antonyuk | | Oil & Gas Operator | Dec 2018 |
| 20684 | Olenox Corp. | Katy, TX 77449 | Oil Operator | Jun 2026 |
| 20685 | Oleum Energy LLC | Georgetown, TX 78628 | Oil & Gas Operator | Feb 2026 |
| 20686 | Oleum Exploration, LLC | Brodheadsvill, PA 18322 | Oil & Gas Operator | Mar 2023 |
| 20687 | Oleum Inc | | Oil & Gas Operator | Mar 1996 |
| 20688 | Oleum Incorporat | | Gas Operator | Dec 1990 |
| 20689 | Oleum Operating Company, L.C. | Longview, TX 75606 | Oil & Gas Operator | Dec 2021 |
| 20690 | Oleum Operating La LLC | | Oil & Gas Operator | Nov 2022 |
| 20691 | Oleum Partners, LLC | Frisco, TX 75034 | Oil & Gas Operator | Jun 2026 |
| 20692 | Olia Oil & Gas Services LLC | Cedar Park, TX 78630-2049 | Oil & Gas Operator | Aug 2022 |
| 20693 | Oliditt Corporation | | Gas Operator | Mar 2022 |
| 20694 | Oliditt Production Inc. | | Gas Operator | Sep 1998 |
| 20695 | Olifant Energy LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2019 |
| 20696 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Jun 2026 |
| 20697 | Oliphant Gertrud | Holdenville, OK 74848-0849 | Oil Operator | Aug 2013 |
| 20698 | Oliphant Operating Co,LTD,LLC | | Oil Operator | Mar 2026 |
| 20699 | Olive Oil & Gas Inc | Jennings, OK 74052 | Oil & Gas Operator | Jan 2026 |
| 20700 | Oliver Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |