| 6201 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 6202 | Collier, Scott Inc. | Holliday, TX 76366 | Oil Operator | May 2003 |
| 6203 | Collier, W. D. Ranch | Post, TX 79356 | Oil & Gas Operator | Jan 2012 |
| 6204 | Collin C W Jr | | Oil Operator | Oct 2015 |
| 6205 | Collin Oil Operations LLC | | Oil Operator | Mar 2025 |
| 6206 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 6207 | Collins Associates Inc | | Oil & Gas Operator | Mar 1987 |
| 6208 | Collins C R And Collins F Dba Collins Brothers Oil | | Oil & Gas Operator | Jul 2008 |
| 6209 | Collins Dillard Dba Dilco Oil Company | Mangum, OK 73554-4029 | Oil & Gas Operator | Mar 2025 |
| 6210 | Collins John B | | Oil Operator | Sep 1994 |
| 6211 | Collins Oil & Gas Corp | Roswell, NM 88202 | Oil & Gas Operator | Jul 2017 |
| 6212 | Collins Oil Comp | | Oil Operator | Apr 1995 |
| 6213 | Collins Oil Company | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2023 |
| 6214 | Collins Oil, LLC | Ellinwood, KS 67526 | Oil Operator | Dec 2024 |
| 6215 | Collins Petroleum Inc | Bartlesville, OK 74006-7024 | Oil & Gas Operator | Apr 2005 |
| 6216 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 6217 | Collins, Dave | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 6218 | Collins, David A And Cole, Alexander B. | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 6219 | Collins, Paul | Big Springs, WV 26137-0000 | Oil & Gas Operator | Dec 2021 |
| 6220 | Collins, Stephen M | | Oil Operator | Jan 2025 |
| 6221 | Collins-McGregor Operating Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 6222 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 6223 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | May 2025 |
| 6224 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 6225 | Colonial Corporation | St Simons Island, GA 31522 | Oil & Gas Operator | Dec 2000 |
| 6226 | Colonial Energy Company Inc | Garland, TN 75045 | Oil & Gas Operator | Apr 2015 |
| 6227 | Colonial Hardwoods Inc | Luthersburg, PA 15848-3506 | Gas Operator | Dec 2019 |
| 6228 | Colonial Resources LLC | Edmond, OK 73003-3207 | Oil & Gas Operator | Aug 2019 |
| 6229 | Colorado Bluebonnet Energy Corp. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2001 |
| 6230 | Colorado Crude E | | Oil Operator | Jan 1986 |
| 6231 | Colorado Drilling Company | Grand Junction, CO 81501 | Oil Operator | Jan 1990 |
| 6232 | Colorado Energy Minerals Inc | | Oil Operator | Dec 2010 |
| 6233 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 6234 | Colorado Interst | | Gas Operator | Aug 1995 |
| 6235 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 6236 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Mar 2025 |
| 6237 | Colorado Oil & G | | Oil & Gas Operator | Oct 1987 |
| 6238 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | May 2003 |
| 6239 | Colorado Oil Co., Inc. | | Oil & Gas Operator | Dec 1977 |
| 6240 | Colorado Pica Petro Corp | Cortez, CO 81321 | Oil & Gas Operator | Apr 2007 |
| 6241 | Colorado-Swanson Landing Oil & Gas, LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 6242 | Colotex Operating, LLC | Aurora, CO 80015 | Oil & Gas Operator | May 2025 |
| 6243 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 6244 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Feb 2025 |
| 6245 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Feb 2025 |
| 6246 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 6247 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jan 2025 |
| 6248 | Colt Energy Inco | | Oil & Gas Operator | Dec 1996 |
| 6249 | Colt Oil & Gas Co. | Abilene, TX 79601 | Oil Operator | Apr 2004 |
| 6250 | Colt Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 1996 |
| 6251 | Colt Oil Corporation | Smithville, WV 26178 | Oil & Gas Operator | Dec 2021 |
| 6252 | Colt Oil LLC | Sapulpa, OK 74066-1010 | Oil Operator | Feb 2025 |
| 6253 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 6254 | Colt Production Corp. Inc. | | Oil & Gas Operator | Jul 1996 |
| 6255 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 6256 | Colter Operating Co | Horseshoe Bay, TX 78654 | Oil & Gas Operator | Nov 1997 |
| 6257 | Coltharp, Edward H | | Oil & Gas Operator | Dec 1970 |
| 6258 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 6259 | Coltrane Charles | | Oil Operator | Dec 1980 |
| 6260 | Columbia Energy Properties, Inc. | Baytown, TX 77521 | Oil & Gas Operator | Jul 2004 |
| 6261 | Columbia Gas Dev. Corp. | | Oil & Gas Operator | Apr 1996 |
| 6262 | Columbia Gas Development | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 6263 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 6264 | Columbia Gas Trans LLC | Charleston, WV 25325-1273 | Gas Operator | Dec 1987 |
| 6265 | Columbia Gas Transmission, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2021 |
| 6266 | Columbia Gulf Transmission Co. | | Oil Operator | Dec 2014 |
| 6267 | Columbia Gulf Transmission Company, LLC | | Oil Operator | Jan 2025 |
| 6268 | Columbia Minerals Corp., Inc. | | Oil & Gas Operator | May 1996 |
| 6269 | Columbia Natural Res Inc | Charleston, WV 25362-0070 | Gas Operator | Dec 2008 |
| 6270 | Columbia Natural Resources, LLC | Charleston, WV 23502 | Oil & Gas Operator | Dec 2021 |
| 6271 | Columbia Oil Company, Inc | Guy, AR 72061 | Oil & Gas Operator | Jan 2025 |
| 6272 | Columbia Petrole | | Oil Operator | Sep 1988 |
| 6273 | Columbia Petroleum Corp. | | Oil & Gas Operator | Jun 1982 |
| 6274 | Columbia Petroleum LLC | Brookhaven, MS 39601 | Oil & Gas Operator | Jan 2025 |
| 6275 | Columbia Petroleum, LTD. | Farmington, UT 84025 | Oil Operator | Feb 2025 |
| 6276 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 6277 | Columbian Production Corporation | Topeka, KS 66601 | Oil Operator | Oct 1999 |
| 6278 | Columbian Servic | | Oil & Gas Operator | Nov 1993 |
| 6279 | Columbian Services C | | Oil Operator | Jan 1992 |
| 6280 | Columbian Services Corporation | Topeka, KS 66603 | Gas Operator | Dec 2009 |
| 6281 | Columbine Associates | | Oil & Gas Operator | Mar 2025 |
| 6282 | Columbine Exploration Corp | Englewood, CO 80111 | Oil & Gas Operator | Aug 1998 |
| 6283 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 6284 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 6285 | Columbus III Production LC | | Oil Operator | Oct 2003 |
| 6286 | Columbus Oil And Gas LLC | | Oil Operator | Oct 2020 |
| 6287 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 6288 | Columbus Oilfield Explor Co | Powell, OH 43065-9315 | Gas Operator | Dec 2004 |
| 6289 | Columbus Oilfield Exploration Company | Columbus, OH 43220 | Oil & Gas Operator | Dec 2013 |
| 6290 | Columbus Production Inc | | Oil & Gas Operator | Mar 2005 |
| 6291 | Comac Well Service, Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 6292 | Comal Operating LLC | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 6293 | Comanche Drilling Company | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2025 |
| 6294 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Mar 2025 |
| 6295 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 6296 | Comanche Oil & Gas Corp | Salt Lake City, UT 84107-3075 | Oil & Gas Operator | May 2005 |
| 6297 | Comanche Oil And Gas Company | Brownwood, TX 76801 | Oil & Gas Operator | May 2025 |
| 6298 | Comanche Oil And Service, LLC | | Oil Operator | Feb 2025 |
| 6299 | Comanche Operating Co. | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2002 |
| 6300 | Comanche Petroleum Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2024 |