| 18201 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 18202 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | May 2026 |
| 18203 | McCoy Production | El Dorado, KS 67042 | Oil Operator | Dec 2019 |
| 18204 | McCoy, Jon | Erie, KS 66733 | Oil Operator | Mar 2026 |
| 18205 | McCracken Energy Services, LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 18206 | McCracken Oil & Gas, LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 18207 | McCracken, Carl A. III | | Oil & Gas Operator | Dec 2012 |
| 18208 | McCracken, Cory | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 18209 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 18210 | McCrary & Franklin, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2012 |
| 18211 | McCrary Oil Company, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Sep 2019 |
| 18212 | McCraw Family Limited Partnership (The) | Konawa, OK 74849-5616 | Oil & Gas Operator | Feb 2026 |
| 18213 | McCray, Gordon M. | Clymer, NY 14724 | Gas Operator | Dec 2025 |
| 18214 | McCrea Exploration Company, Inc. | Carrollton, TX 75007 | Oil & Gas Operator | Nov 1995 |
| 18215 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Jun 2026 |
| 18216 | McCulliss Resource Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 1999 |
| 18217 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 18218 | McCulloch Geothermal Corporation | | Oil & Gas Operator | Jun 1982 |
| 18219 | McCulloch Oil Corp Of Ca | | Oil & Gas Operator | May 1980 |
| 18220 | McCulloch Oil Corp.-Ids | | Oil & Gas Operator | Dec 1981 |
| 18221 | McCullough G W | Norman, OK 73072 | Oil & Gas Operator | Aug 2000 |
| 18222 | McCullough, Richard F. | Pennsboro, WV 26415 | Oil & Gas Operator | Dec 2021 |
| 18223 | McCurdy Energy LLC | Midland, TX 79707 | Oil Operator | Sep 2025 |
| 18224 | McCurdy Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 18225 | McCutchin Alma Estate | Dallas, TX 75380 | Oil & Gas Operator | May 2013 |
| 18226 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 18227 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 18228 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 18229 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Sep 2026 |
| 18230 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Sep 2026 |
| 18231 | McDaniel Oil Holdings, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Sep 2026 |
| 18232 | McDaniel Petroleum Company, Inc. | | Oil Operator | Jun 2020 |
| 18233 | McDaniel, Willard | Iraan, TX 79744 | Oil & Gas Operator | Nov 2004 |
| 18234 | McDaniel, Willard Jr. Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2005 |
| 18235 | McDay Energy Corp. | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 18236 | McDe Energy Company Inc | Enid, OK 73706 | Oil & Gas Operator | May 2009 |
| 18237 | McDonald & Johnson Resources,LLC | Cypress, TX 77429 | Oil & Gas Operator | Dec 2010 |
| 18238 | McDonald & Pomeroy Operating Co. | Pasadena, TX 77506 | Oil & Gas Operator | Aug 2003 |
| 18239 | McDonald Dale E | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2025 |
| 18240 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Sep 2026 |
| 18241 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 18242 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Sep 2026 |
| 18243 | McDonald Ranch Partnership | | Oil Operator | Dec 2025 |
| 18244 | McDonald Resources, LLC | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2026 |
| 18245 | McDonald, Joe | Burkburnett, TX 76354 | Oil & Gas Operator | Aug 1995 |
| 18246 | McDonald, R. A. Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Oct 2002 |
| 18247 | McDonald, Richard A. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Sep 2026 |
| 18248 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 18249 | McDowell And Cook, Inc. | | Oil Operator | Jan 1987 |
| 18250 | McDowell Ranch | Shamrock, TX 79079 | Gas Operator | Sep 2026 |
| 18251 | McElroy Drilling Co., Inc. | | Gas Operator | Dec 1987 |
| 18252 | McElroy John | Sapulpa, OK 74066-6119 | Oil & Gas Operator | Apr 2026 |
| 18253 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 18254 | McElvain Oil & Gas Properties Inc | Denver, CO 80265-2080 | Oil & Gas Operator | Jul 2011 |
| 18255 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 18256 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 18257 | McEver Oil Company Inc. | Austin, TX 78789 | Oil & Gas Operator | Mar 2008 |
| 18258 | MCF Co. | | Oil & Gas Operator | Dec 2011 |
| 18259 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Sep 2026 |
| 18260 | McFadden Oil Co. | | Oil Operator | Apr 2026 |
| 18261 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Sep 2026 |
| 18262 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 18263 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Jun 2026 |
| 18264 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 18265 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 18266 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | May 2026 |
| 18267 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 18268 | McGhee Exploration And Prod. Co. | Houston, TX 77019 | Oil & Gas Operator | Feb 2003 |
| 18269 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 18270 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 18271 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2026 |
| 18272 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 18273 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 18274 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 18275 | McGoldrick & Watson | | Oil & Gas Operator | Jul 1987 |
| 18276 | McGoldrick & Watson - Alagood | | Oil Operator | Oct 1995 |
| 18277 | McGoldrick & Watson DRLG., Co. | | Oil & Gas Operator | Jul 1987 |
| 18278 | McGoldrick & Watson, Et Al | | Oil Operator | Jul 1987 |
| 18279 | McGoldrick & Watson-Walker | | Oil Operator | Jul 1987 |
| 18280 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 18281 | McGonagill J W | MT Gilead, OH 43338 | Oil Operator | Dec 1984 |
| 18282 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 18283 | McGonigal Donald T | Tulsa, OK 74114-2145 | Oil & Gas Operator | Jul 2004 |
| 18284 | McGonigal Ted W | Norman, OK 73072 | Oil & Gas Operator | May 2026 |
| 18285 | McGowan Oil Company, A General Partnership | Arkansas City, KS 67005 | Oil Operator | Mar 2026 |
| 18286 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 18287 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Sep 2026 |
| 18288 | McGowen Resources Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 18289 | McGown Drilling | | Oil Operator | Apr 1993 |
| 18290 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | Apr 2026 |
| 18291 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Apr 2026 |
| 18292 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 18293 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Sep 2026 |
| 18294 | McGuire Brothers | Phoenix, AZ 85045 | Oil & Gas Operator | Sep 2026 |
| 18295 | McGuire John C | Gillette, WY 82717 | Oil & Gas Operator | Oct 2005 |
| 18296 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 18297 | McIlhenny-Powell Operating Co | | Gas Operator | Aug 1983 |
| 18298 | McIlvain Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2017 |
| 18299 | McIntosh Oil & Gas, Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 18300 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |