| 2301 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 2302 | Cortland Energy Co Inc | Worthington, OH 43085 | Oil & Gas Operator | Dec 2024 |
| 2303 | Corum Production Co.-Tepco | | Oil & Gas Operator | Dec 1989 |
| 2304 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 2305 | Corvette Oil Corporation | Fort Worth, TX 76115 | Oil & Gas Operator | Mar 2008 |
| 2306 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 2307 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 2308 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2025 |
| 2309 | Coseka Resources USA LTD | Denver, CO 80202-1602 | Oil & Gas Operator | Jun 1988 |
| 2310 | Cosgriff Joe | Detroit, MI 48208 | Oil & Gas Operator | Dec 1998 |
| 2311 | Coshocton Pipe Co | Columbus, OH 43229 | Oil & Gas Operator | Dec 1989 |
| 2312 | Cosper Well/H Cosper | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 2313 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 2314 | Costa Loma LTD. | | Oil & Gas Operator | Sep 2025 |
| 2315 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 2316 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2317 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 2318 | Coteau Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 2319 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Sep 2025 |
| 2320 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 2321 | Coterra Energy Operating E LLC | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 2322 | Coterra Energy Operating F LLC | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 2323 | Coterra Energy Operating M LLC | Midland, TX 79706 | Oil & Gas Operator | Aug 2019 |
| 2324 | Cotiga Development Company, Limited Partnership | Williamson, WV 25661-0000 | Oil & Gas Operator | Dec 2021 |
| 2325 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 2326 | Cotton Petroleum | | Oil & Gas Operator | May 1988 |
| 2327 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 2328 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 2329 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 2330 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2025 |
| 2331 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 2332 | Cotton Well Drilling Co Inc | Sheridan, NY 14135 | Oil & Gas Operator | Dec 2024 |
| 2333 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 2334 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 2335 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Aug 2025 |
| 2336 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 2337 | Cottonwood Oil Inc | Worland, WY 82401 | Oil & Gas Operator | Jun 1988 |
| 2338 | Cottonwood Opr Corp | Dubois, PA 15801-0403 | Gas Operator | Dec 1989 |
| 2339 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 2340 | Cottonwood Prod Co Inc | Buffalo, NY 14202-2212 | Gas Operator | Dec 2002 |
| 2341 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 2342 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Aug 2025 |
| 2343 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 2344 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Dec 2025 |
| 2345 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 2346 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 2347 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 2348 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 2349 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 2350 | Cougar Exploration, Inc. | | Oil & Gas Operator | Jun 1988 |
| 2351 | Cougar Oil | | Oil Operator | Jul 2025 |
| 2352 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 2353 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 2354 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 2355 | Coulthurst MGT & Inv Inc | Reno, NV 89504 | Oil Operator | Sep 2020 |
| 2356 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jul 2025 |
| 2357 | Country Boy Oil Co Inc | | Oil Operator | Nov 2017 |
| 2358 | Country Side Sand & Gravel, Inc | Collins, NY 14034 | Gas Operator | Dec 2024 |
| 2359 | Countrymark Energy Resources L L C | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2023 |
| 2360 | County Line Resources LLC | Lancaster, TX 75146 | Oil Operator | Dec 2025 |
| 2361 | County Line Stone Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 2362 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Aug 2025 |
| 2363 | County Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 1993 |
| 2364 | Countyline Production Co LLC | Duncan, OK 73533 | Oil Operator | Aug 2025 |
| 2365 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 2366 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 2367 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 2368 | Courtland City Lights Assoc. | | Oil Operator | Dec 2005 |
| 2369 | Courtney Oil Co. | | Oil Operator | Dec 1998 |
| 2370 | Coushatta Oil & Gas Inc. | | Oil & Gas Operator | Jan 2007 |
| 2371 | Cousins Exploration Co | Wichita Falls, TX 76307 | Oil Operator | Jun 1991 |
| 2372 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 2373 | Covenant Oil & Gas, L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 2006 |
| 2374 | Covenant Oil Company | Houma, LA 70360 | Oil & Gas Operator | Dec 2015 |
| 2375 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 2376 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 2377 | Covenant Production Co., L.C. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 2378 | Covered H Energy, LLC | Lubbock, TX 79423 | Oil Operator | Dec 2025 |
| 2379 | Covert, Christopher P. | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 2380 | Covey Energy, Inc. | | Oil & Gas Operator | Jun 1998 |
| 2381 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 2382 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 2383 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 2384 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 2385 | Cow Creek Resources Inc | Ponca City, OK 74601-7815 | Oil & Gas Operator | Aug 2025 |
| 2386 | Cow Run LTD Liability Company | Davidson, NC 28036 | Oil & Gas Operator | Nov 2018 |
| 2387 | Cowan Oil Company | | Oil Operator | Sep 1990 |
| 2388 | Cowboy Clean Fuels LLC | Laramie, WY 82072 | Gas Operator | Sep 2025 |
| 2389 | Cowboy Oil & Gas | Bristow, OK 74010-0057 | Oil & Gas Operator | Jul 2018 |
| 2390 | Cowboy Operating LLC | Oklahoma City, OK 73120 | Oil Operator | Aug 2025 |
| 2391 | Cowboys Resources Corp. | New Braunfels, TX 78132 | Oil Operator | Jan 2008 |
| 2392 | Cowden SR Lester L | Oklahoma City, OK 73118-4011 | Oil & Gas Operator | Sep 1999 |
| 2393 | Cowen Michael T | | Oil & Gas Operator | Dec 2009 |
| 2394 | Cowles James C | Muskogee, OK 74401-5262 | Oil Operator | Jan 2025 |
| 2395 | Cowley Energy Associates, LLC | Plano, TX 75093 | Gas Operator | Dec 2009 |
| 2396 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Dec 2025 |
| 2397 | Cowry Enterprises, LTD. | Littleton, CO 80161-3310 | Oil & Gas Operator | Mar 2022 |
| 2398 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 2399 | Cox Edwin L & Be | | Oil & Gas Operator | Nov 1989 |
| 2400 | Cox Edwin L & Berry R | | Oil & Gas Operator | Oct 1987 |