| 6501 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 6502 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 6503 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2026 |
| 6504 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 6505 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 6506 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 6507 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Aug 2026 |
| 6508 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 6509 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 6510 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 6511 | Cosper Well/H Cosper | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 6512 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Aug 2026 |
| 6513 | Costa Loma LTD. | | Oil & Gas Operator | Dec 2025 |
| 6514 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 6515 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6516 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 6517 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 6518 | Coterra Energy Inc | Coraopolis, PA 15108-9862 | Oil & Gas Operator | May 2026 |
| 6519 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Aug 2026 |
| 6520 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | Jan 2026 |
| 6521 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 6522 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 6523 | Cotiga Development Company, Limited Partnership | Williamson, WV 25661-0000 | Oil & Gas Operator | Dec 2021 |
| 6524 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 6525 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 6526 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 6527 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 6528 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Aug 2026 |
| 6529 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 6530 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2025 |
| 6531 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 6532 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 6533 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Apr 2026 |
| 6534 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 6535 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |
| 6536 | Cottonwood Opr Corp | | Gas Operator | Dec 1989 |
| 6537 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 6538 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |
| 6539 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 6540 | Cotula Oil & Gas Co., Inc. | Cross Plains, TX 76443 | Oil Operator | Aug 2026 |
| 6541 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Apr 2026 |
| 6542 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 6543 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Aug 2026 |
| 6544 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2026 |
| 6545 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 6546 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 6547 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 6548 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 6549 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 6550 | Cougar Oil | | Oil Operator | Jan 2026 |
| 6551 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 6552 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 6553 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 6554 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 6555 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Dec 2025 |
| 6556 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 6557 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2025 |
| 6558 | Countrymark Energy Resources L L C | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2024 |
| 6559 | County Line Stone Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2025 |
| 6560 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Apr 2026 |
| 6561 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |
| 6562 | Countyline Production Co LLC | Duncan, OK 73533 | Oil Operator | Apr 2026 |
| 6563 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 6564 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Aug 2026 |
| 6565 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 6566 | Courtland City Lights Assoc. | | Oil Operator | Dec 2005 |
| 6567 | Courtney Oil Co. | | Oil Operator | Dec 1998 |
| 6568 | Coushatta Oil & Gas Inc. | | Oil & Gas Operator | Jan 2007 |
| 6569 | Cousins Exploration Co | Wichita Falls, TX 76307 | Oil Operator | Jun 1991 |
| 6570 | Covalence Operating Company LLC | | Oil & Gas Operator | May 2026 |
| 6571 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 6572 | Covenant Oil & Gas, L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 2006 |
| 6573 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 6574 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 6575 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Aug 2026 |
| 6576 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 6577 | Covert, Christopher P. | Auburn, NY 13021 | Gas Operator | Dec 2025 |
| 6578 | Covey Energy, Inc. | | Oil & Gas Operator | Jun 1998 |
| 6579 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 6580 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 6581 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 6582 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Apr 2026 |
| 6583 | Cow Creek Resources Inc | Ponca City, OK 74601-7815 | Oil & Gas Operator | Apr 2026 |
| 6584 | Cow Run LTD Liability Company | Davidson, NC 28036 | Oil & Gas Operator | Nov 2018 |
| 6585 | Cowan Oil Company | | Oil Operator | Sep 1990 |
| 6586 | Cowboy Clean Fuels LLC | Laramie, WY 82072 | Gas Operator | Jun 2026 |
| 6587 | Cowboy Oil & Gas | Bristow, OK 74010-0057 | Oil & Gas Operator | Jul 2018 |
| 6588 | Cowboy Operating LLC | Oklahoma City, OK 73120 | Oil Operator | Mar 2026 |
| 6589 | Cowboys Resources Corp. | New Braunfels, TX 78132 | Oil Operator | Jan 2008 |
| 6590 | Cowden SR Lester L | Oklahoma City, OK 73118-4011 | Oil & Gas Operator | Sep 1999 |
| 6591 | Cowen Michael T | | Oil & Gas Operator | Dec 2009 |
| 6592 | Cowles James C | Muskogee, OK 74401-5262 | Oil Operator | Mar 2026 |
| 6593 | Cowley Energy Associates, LLC | Plano, TX 75093 | Gas Operator | Dec 2009 |
| 6594 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Aug 2026 |
| 6595 | Cowry Enterprises, LTD. | Littleton, CO 80161-3310 | Oil & Gas Operator | Mar 2022 |
| 6596 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2026 |
| 6597 | Cox Edwin L & Be | | Oil & Gas Operator | Nov 1989 |
| 6598 | Cox Edwin L & Berry R | | Oil & Gas Operator | Oct 1987 |
| 6599 | Cox Edwin L & R Berry | Dallas, TX 75202 | Oil & Gas Operator | Apr 2015 |
| 6600 | Cox Elmer N | Irving, TX 75181 | Oil Operator | Aug 2013 |