| 6601 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2024 |
| 6602 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 6603 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 6604 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 6605 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 6606 | Corum Operating Company, LLC | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 6607 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 6608 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 6609 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 6610 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 6611 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 6612 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jul 2025 |
| 6613 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 6614 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 6615 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 6616 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Jul 2025 |
| 6617 | Costa Loma LTD. | | Oil & Gas Operator | Apr 2025 |
| 6618 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 6619 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 6620 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 6621 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 6622 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | May 2025 |
| 6623 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 6624 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 6625 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 6626 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 6627 | Cotiga Development Company, Limited Partnership | Williamson, WV 25661-0000 | Oil & Gas Operator | Dec 2021 |
| 6628 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 6629 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 6630 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 6631 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 6632 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Jul 2025 |
| 6633 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 6634 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2024 |
| 6635 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 6636 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 6637 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Mar 2025 |
| 6638 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 6639 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |
| 6640 | Cottonwood Opr Corp | Dubois, PA 15801-0403 | Gas Operator | Dec 1989 |
| 6641 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 6642 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |
| 6643 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 6644 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Apr 2025 |
| 6645 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 6646 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Jul 2025 |
| 6647 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 6648 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 6649 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 6650 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 6651 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 6652 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 6653 | Cougar Oil | | Oil Operator | Feb 2025 |
| 6654 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 6655 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 6656 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 6657 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 6658 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Apr 2025 |
| 6659 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 6660 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2024 |
| 6661 | Countrymark Energy Resources, LLC | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2023 |
| 6662 | County Line Resources LLC | Lancaster, TX 75146 | Oil Operator | Jul 2025 |
| 6663 | County Line Stone Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 6664 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Mar 2025 |
| 6665 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |
| 6666 | Countyline Production Co LLC | Duncan, OK 73533 | Oil Operator | Apr 2025 |
| 6667 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 6668 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 6669 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 6670 | Courtland City Lights Assoc. | | Oil Operator | Dec 2005 |
| 6671 | Courtney Oil Co. | | Oil Operator | Dec 1998 |
| 6672 | Courtwright Management, Inc. | Bridgeport, WV 26330 | Gas Operator | Dec 2021 |
| 6673 | Coushatta Oil & Gas Inc. | | Oil & Gas Operator | Jan 2007 |
| 6674 | Cousins Exploration Co | Wichita Falls, TX 76307 | Oil Operator | Jun 1991 |
| 6675 | Covalent Exploration Incorporated | Houston, TX 77079 | Oil Operator | Jul 2025 |
| 6676 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 6677 | Covenant Oil & Gas, L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 2006 |
| 6678 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 6679 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 6680 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Jul 2025 |
| 6681 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 6682 | Covered H Energy, LLC | Lubbock, TX 79423 | Oil Operator | Jul 2025 |
| 6683 | Covert, Christopher P. | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 6684 | Covey Energy, Inc. | | Oil & Gas Operator | Jun 1998 |
| 6685 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 6686 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 6687 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 6688 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | May 2025 |
| 6689 | Cow Creek Resources Inc | Ponca City, OK 74601-7815 | Oil & Gas Operator | Apr 2025 |
| 6690 | Cow Run LTD Liability Company | Davidson, NC 28036 | Oil & Gas Operator | Nov 2018 |
| 6691 | Cowan Oil Company | | Oil Operator | Sep 1990 |
| 6692 | Cowboy Clean Fuels LLC | Laramie, WY 82072 | Gas Operator | Apr 2025 |
| 6693 | Cowboy Oil & Gas | Bristow, OK 74010-0057 | Oil & Gas Operator | Jul 2018 |
| 6694 | Cowboy Operating LLC | Oklahoma City, OK 73120 | Oil Operator | Apr 2025 |
| 6695 | Cowboys Resources Corp. | New Braunfels, TX 78132 | Oil Operator | Jan 2008 |
| 6696 | Cowden SR Lester L | Oklahoma City, OK 73118-4011 | Oil & Gas Operator | Sep 1999 |
| 6697 | Cowen Michael T | | Oil & Gas Operator | Dec 2009 |
| 6698 | Cowles James C | Muskogee, OK 74401-5262 | Oil Operator | Jan 2025 |
| 6699 | Cowley Energy Associates, LLC | Plano, TX 75093 | Gas Operator | Dec 2009 |
| 6700 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Jul 2025 |