| 18201 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 18202 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 18203 | McEver Oil Company Inc. | Austin, TX 78789 | Oil & Gas Operator | Mar 2008 |
| 18204 | MCF Co. | | Oil & Gas Operator | Dec 2011 |
| 18205 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Jun 2026 |
| 18206 | McFadden Oil Co. | | Oil Operator | Feb 2026 |
| 18207 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Jun 2026 |
| 18208 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 18209 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Mar 2026 |
| 18210 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 18211 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 18212 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Feb 2026 |
| 18213 | McGehee, George T. Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 1997 |
| 18214 | McGhee Exploration And Prod. Co. | Houston, TX 77019 | Oil & Gas Operator | Feb 2003 |
| 18215 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 18216 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 18217 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 18218 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 18219 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 18220 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 18221 | McGoldrick & Watson | | Oil & Gas Operator | Jul 1987 |
| 18222 | McGoldrick & Watson - Alagood | | Oil Operator | Oct 1995 |
| 18223 | McGoldrick & Watson DRLG., Co. | | Oil & Gas Operator | Jul 1987 |
| 18224 | McGoldrick & Watson, Et Al | | Oil Operator | Jul 1987 |
| 18225 | McGoldrick & Watson-Walker | | Oil Operator | Jul 1987 |
| 18226 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 18227 | McGonagill J W | MT Gilead, OH 43338 | Oil Operator | Dec 1984 |
| 18228 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 18229 | McGonigal Donald T | Tulsa, OK 74114-2145 | Oil & Gas Operator | Jul 2004 |
| 18230 | McGonigal Ted W | Norman, OK 73072 | Oil & Gas Operator | Jan 2026 |
| 18231 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 18232 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Jun 2026 |
| 18233 | McGowen Resources Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 18234 | McGown Drilling | | Oil Operator | Apr 1993 |
| 18235 | McGown Drilling, Inc. | Mound City, KS 66056 | Oil Operator | Feb 2026 |
| 18236 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Feb 2026 |
| 18237 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 18238 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Jun 2026 |
| 18239 | McGuire John C | Gillette, WY 82717 | Oil & Gas Operator | Oct 2005 |
| 18240 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 18241 | McIlhenny-Powell Operating Co | | Gas Operator | Aug 1983 |
| 18242 | McIlvain Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2017 |
| 18243 | McIntosh Oil & Gas, Inc. | Coalton, WV 26257 | Oil & Gas Operator | Dec 2021 |
| 18244 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |
| 18245 | McIntyre Oil Company | | Oil & Gas Operator | Jan 1992 |
| 18246 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Jun 2026 |
| 18247 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 18248 | McKay Oil | Portales, NM 88130 | Oil & Gas Operator | Apr 1996 |
| 18249 | McKay Oil & Gas LLC | Albuquerque, NM 87191 | Gas Operator | Mar 2020 |
| 18250 | McKay Oil Company | Perry, OK 73077 | Oil Operator | Nov 2008 |
| 18251 | McKay Oil Corp | Roswell, NM 88202 | Oil & Gas Operator | Aug 2017 |
| 18252 | McKay Operating LLC | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2023 |
| 18253 | McKean Bros. | | Oil & Gas Operator | Dec 1997 |
| 18254 | McKee Don Drill Co Inc | Newark, OH 43058 | Oil & Gas Operator | Dec 2012 |
| 18255 | McKee Energy Comapny Inc | | Oil & Gas Operator | Apr 2011 |
| 18256 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18257 | McKeever, Tyra, Swenson Venture | Stamford, TX 79553 | Oil & Gas Operator | Apr 1996 |
| 18258 | McKellpee Energy Corp. | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 18259 | McKelvy A D Oil | | Gas Operator | Feb 1995 |
| 18260 | McKenna Oil Co | Kane, PA 16735-9711 | Oil & Gas Operator | Dec 2004 |
| 18261 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 18262 | McKenzie Management Inc. | | Oil & Gas Operator | Aug 1989 |
| 18263 | McKenzie Methane | Houston, TX BAD ADDR | Gas Operator | Apr 1994 |
| 18264 | McKenzie Operating Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 18265 | McKenzie Petroleum Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 18266 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 18267 | McKinney Kenneth R | Okmulgee, OK 74447-6932 | Oil Operator | Aug 2000 |
| 18268 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 18269 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 18270 | McKnight, C. L. | McLeod, TX 75565 | Oil & Gas Operator | Jun 2026 |
| 18271 | McKnight, C. L. Oil Co. LLP | McLeod, TX 75565 | Oil & Gas Operator | Jun 2026 |
| 18272 | McKnight, J. C. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2019 |
| 18273 | MCL 1 Oil & Gas Wyoming LLC | Minneapolis, MN 55402 | Oil & Gas Operator | Jul 2018 |
| 18274 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 18275 | McLain J. Forman | | Oil & Gas Operator | Mar 1988 |
| 18276 | McLane Trust* Dixie | | Gas Operator | Oct 2025 |
| 18277 | McLaurin Oil Co. | | Oil Operator | Jan 2025 |
| 18278 | McLelland Engineering & MGMT. | Houston, TX 77042 | Oil & Gas Operator | Mar 1999 |
| 18279 | McLemore, Laurence | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2026 |
| 18280 | McLennan Family Properties LLP | | Oil & Gas Operator | Dec 2021 |
| 18281 | McLeod Gas Gath & Proc Co. L.L.C. | | Oil Operator | Jul 2012 |
| 18282 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 18283 | McLester Oil & G | | Oil & Gas Operator | Jun 1992 |
| 18284 | McLish, Holmes P | Denver, CO 80202 | Oil & Gas Operator | Dec 1983 |
| 18285 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 18286 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 18287 | MCM Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 18288 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 18289 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 18290 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 18291 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 18292 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 18293 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 18294 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Feb 2026 |
| 18295 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Jun 2026 |
| 18296 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 18297 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 18298 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 18299 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |
| 18300 | McMullan Oil Company | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2023 |