| 1301 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 1302 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 1303 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 1304 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 1305 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 1306 | Consolidated Production Inc. | Seminole, OK 74868 | Oil & Gas Operator | Aug 2025 |
| 1307 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 1308 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 1309 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Sep 2025 |
| 1310 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 1311 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 1312 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Sep 2025 |
| 1313 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 1314 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 1315 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 1316 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 1317 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 1318 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 1319 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 1320 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 1321 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 1322 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 1323 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 1324 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 1325 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 1326 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 1327 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 1328 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 1329 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 1330 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 1331 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 1332 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 1333 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 1334 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 1335 | Coppock Herb Energy | Fairview, OK 73737-1037 | Oil & Gas Operator | May 2018 |
| 1336 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 1337 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 1338 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 1339 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Aug 2025 |
| 1340 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 1341 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 1342 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2025 |
| 1343 | Corley G R | | Oil & Gas Operator | Jun 2009 |
| 1344 | Corley Production Company | Wilson, OK 73463-7218 | Oil Operator | Aug 2025 |
| 1345 | Corley Production Inc | Comanche, OK 73529-4668 | Oil Operator | Mar 2015 |
| 1346 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 1347 | Cornelius Dale | Willow, OK 73673 | Oil Operator | Jul 2025 |
| 1348 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 1349 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Sep 2025 |
| 1350 | Cornelius Petroleum Inc | | Oil & Gas Operator | Aug 2025 |
| 1351 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 1352 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Apr 2025 |
| 1353 | Cornelius, Steven L | | Oil Operator | Sep 2015 |
| 1354 | Cornell Glen R | Pauls Valley, OK 73075-9606 | Oil & Gas Operator | Oct 2013 |
| 1355 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 1356 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 1357 | Coronado Energy Partners LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 1358 | Coronado Great Plains LLC | Tulsa, OK 74137-2832 | Gas Operator | Apr 2013 |
| 1359 | Coronado Oklahoma LLC | Tulsa, OK 74133-7036 | Gas Operator | Apr 2020 |
| 1360 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Aug 2025 |
| 1361 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 1362 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 1363 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 1364 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 1365 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 1366 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1367 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 1368 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 1369 | Cotton County Ventures | Estes Park, CO 80517 | Oil Operator | Nov 2003 |
| 1370 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 1371 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Aug 2025 |
| 1372 | Couch Donald W | Marlow, OK 73055 | Oil & Gas Operator | Aug 2025 |
| 1373 | Couch Fred J | Broken Arrow, OK 74012 | Oil Operator | Mar 2010 |
| 1374 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 1375 | Cougar Oil | | Oil Operator | Jul 2025 |
| 1376 | Coughlin, Daniel L | | Oil Operator | Aug 2000 |
| 1377 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jul 2025 |
| 1378 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Aug 2025 |
| 1379 | Countyline Production Co LLC | Duncan, OK 73533 | Oil Operator | Aug 2025 |
| 1380 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 1381 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 1382 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 1383 | Cousins Exploration Co | Wichita Falls, TX 76307 | Oil Operator | Jun 1991 |
| 1384 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 1385 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 1386 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 1387 | Cow Creek Resources Inc | Ponca City, OK 74601-7815 | Oil & Gas Operator | Aug 2025 |
| 1388 | Cowboy Oil & Gas | Bristow, OK 74010-0057 | Oil & Gas Operator | Jul 2018 |
| 1389 | Cowboy Operating LLC | Oklahoma City, OK 73120 | Oil Operator | Aug 2025 |
| 1390 | Cowden SR Lester L | Oklahoma City, OK 73118-4011 | Oil & Gas Operator | Sep 1999 |
| 1391 | Cowles James C | Muskogee, OK 74401-5262 | Oil Operator | Jan 2025 |
| 1392 | Cox Edwin L & R Berry | Dallas, TX 75202 | Oil & Gas Operator | Apr 2015 |
| 1393 | Cox Elmer N | Irving, TX 75181 | Oil Operator | Aug 2013 |
| 1394 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 1395 | Cox Gas Corporation | Dallas, TX 75201-7306 | Oil & Gas Operator | Apr 2015 |
| 1396 | Cox Linda | Bristow, OK 74010-0808 | Oil & Gas Operator | Jan 2018 |
| 1397 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 1398 | Cox P D Inc | Bristow, OK 74010 | Oil & Gas Operator | May 1993 |
| 1399 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 1400 | Cox Robert L | Blackwell, OK 74631 | Oil & Gas Operator | Mar 2025 |