| 20501 | Mott Energy LLC | Riverview, FL 33569-6702 | Oil & Gas Operator | Sep 2024 |
| 20502 | Mott Oil & Gas | Sugarland, TX 77478 | Oil & Gas Operator | May 2001 |
| 20503 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 20504 | Motto Energy Inc. | Normantown, WV 25267-8215 | Oil & Gas Operator | Dec 2021 |
| 20505 | Mount Chestnut Dev LLC | Butler, PA 16002-3940 | Gas Operator | Dec 2017 |
| 20506 | Mount Richard | Newark, OH 43055 | Oil Operator | Dec 2005 |
| 20507 | Mount, Thomas | North East, PA 16428 | Gas Operator | Dec 2024 |
| 20508 | Mountain Creek Energy Inc | Georgetown, TX 78633 | Oil & Gas Operator | Nov 2025 |
| 20509 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | Feb 2026 |
| 20510 | Mountain Divide, LLC | | Oil & Gas Operator | Mar 2017 |
| 20511 | Mountain DRLG, Inc | Hindman, KY 41822 | Oil & Gas Operator | Dec 2023 |
| 20512 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 20513 | Mountain Hawk Energy LLC | Athens, TX 75751 | Gas Operator | Jan 2015 |
| 20514 | Mountain Oil And Gas Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Dec 2025 |
| 20515 | Mountain Pacific General Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2022 |
| 20516 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2013 |
| 20517 | Mountain Resource Corporation | Salt Lake City, UT 84124 | Oil & Gas Operator | Dec 1988 |
| 20518 | Mountain State Oil Company, L..L.C. | Pennsboro, WV 26415-0014 | Oil & Gas Operator | Dec 2021 |
| 20519 | Mountain State Well Tending | Hurricane, WV 25526-0000 | Oil & Gas Operator | Dec 2021 |
| 20520 | Mountain States Petroleum Corp | Midland, TX 79702 | Oil & Gas Operator | Apr 2008 |
| 20521 | Mountain States Resources Inc | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2000 |
| 20522 | Mountain V Oil & Gas, Inc. | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 20523 | Mountain V Texas, LLC | | Oil & Gas Operator | Feb 2026 |
| 20524 | Mountain V, LLC | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 20525 | Mountain VIew Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 20526 | Mountaineer Gas Transmission, Inc. | Fort Worth, TX 76185-0000 | Oil & Gas Operator | Dec 2021 |
| 20527 | Mountaineer Oil & Gas, LLC | | Oil & Gas Operator | Dec 2020 |
| 20528 | Mountaineer State Energy, Inc. | Dallas, TX 75234 | Oil & Gas Operator | Dec 2021 |
| 20529 | Mountaineer State Operations, LLC | Sandyville, WV 25275 | Oil & Gas Operator | Dec 2024 |
| 20530 | Mountaineer Trading Company, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2016 |
| 20531 | Mourning James & Carol | Middleport, OH 45760-1214 | Gas Operator | Dec 2024 |
| 20532 | Mowata Oil Company | Victoria, TX 77903 | Oil & Gas Operator | Oct 1996 |
| 20533 | Mowdy Robert F | Coalgate, OK 74538 | Oil & Gas Operator | May 2001 |
| 20534 | Moxie Gas Company LLC | Hilton Head, SC 29926-1242 | Gas Operator | Dec 2024 |
| 20535 | Moxy Oil Company | Seguin, TX 78155 | Oil & Gas Operator | Aug 2003 |
| 20536 | Moy, Gary | Falls City, TX 78113 | Oil & Gas Operator | Nov 1998 |
| 20537 | Moylan, Jimmie C. | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 20538 | Moylan, Thomas F. | Lacygne, KS 66040 | Oil & Gas Operator | Dec 1993 |
| 20539 | Mozark Corporation | Spring, TX 77379-8049 | Oil & Gas Operator | Jan 2011 |
| 20540 | Moze Inc | Ochelata, OK 74051 | Oil & Gas Operator | Jan 2001 |
| 20541 | MP Oil Operations | | Gas Operator | Dec 2004 |
| 20542 | MPG Petroleum | San Antonio, TX 78217 | Oil & Gas Operator | Aug 2003 |
| 20543 | MPG Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 20544 | Mr NM Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 20545 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 20546 | MRD Nowata LLC | Woodstock, GA 30189 | Oil Operator | Aug 2017 |
| 20547 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 20548 | MRD Operating LLC (Delaware) | Houston, TX 77010 | Oil & Gas Operator | Jul 2015 |
| 20549 | Mri Ventures, Inc. | | Oil Operator | Dec 1993 |
| 20550 | Mroz Baier, Christine | Memphis, TN 38120 | Gas Operator | Dec 2024 |
| 20551 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 20552 | Mrs. C. M. Roberson | | Oil Operator | Mar 1989 |
| 20553 | Mrs. Cecile Andries & Sons | | Oil Operator | Dec 2006 |
| 20554 | Mrs. Clara B. Guthrie | | Gas Operator | Jun 1996 |
| 20555 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 20556 | MS Producing LLC | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 20557 | MS United, LLC | | Oil & Gas Operator | Sep 2025 |
| 20558 | MSB Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 20559 | MSB Operating Company | Enid, OK 73703 | Oil & Gas Operator | Jan 2005 |
| 20560 | MSD Energy, Inc | Rapid City, SD 57702 | Oil & Gas Operator | Dec 2020 |
| 20561 | MSD Operating, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2026 |
| 20562 | Mse Operating Corp. | Beaverton, OR 97008 | Oil & Gas Operator | Feb 2026 |
| 20563 | MSG Resources Inc. | Iola, KS 66749 | Oil Operator | Sep 2025 |
| 20564 | MSL Oil & Gas Corp | Bradford, PA 16701-0151 | Oil & Gas Operator | Dec 2025 |
| 20565 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Feb 2026 |
| 20566 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 20567 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Feb 2026 |
| 20568 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 20569 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 20570 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Feb 2026 |
| 20571 | MT Savage Refractories | Pittsburgh, PA 15206-0171 | Gas Operator | Dec 2021 |
| 20572 | MT. Crescent Operating Company, LLC | | Oil & Gas Operator | Dec 2025 |
| 20573 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 20574 | MTG Operating Inc | Ridgeland, MS 39158 | Gas Operator | Apr 2011 |
| 20575 | MTM Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Sep 2025 |
| 20576 | MTN Energy | Aleppo, PA 15310 | Oil & Gas Operator | Dec 2025 |
| 20577 | MTN V Oil & Gas Inc | Indiana, PA 15701-8914 | Oil & Gas Operator | Dec 2025 |
| 20578 | Mto Oil Company | Okay, OK 74446-0354 | Oil Operator | Jul 2019 |
| 20579 | Muckleroy Gas | San Antonio, TX 78247 | Gas Operator | Feb 2026 |
| 20580 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 20581 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Nov 2025 |
| 20582 | Mud River Oil & Gas, LLC | Rochester, KY 42273 | Oil Operator | Dec 2023 |
| 20583 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Feb 2026 |
| 20584 | Muegge Don E | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 1996 |
| 20585 | Muegge, Clay A. | Lamont, OK 74643 | Oil Operator | Aug 1991 |
| 20586 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Oct 2025 |
| 20587 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 20588 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Feb 2026 |
| 20589 | Mueller Fred W | | Oil & Gas Operator | Dec 1995 |
| 20590 | Mueller Oil | | Oil Operator | Jul 2025 |
| 20591 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 20592 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 20593 | Mueller, Thomas C Inc | | Gas Operator | Oct 2003 |
| 20594 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 20595 | Muffoletto, Michael R. | Brant, NY 14027 | Gas Operator | Dec 2024 |
| 20596 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 20597 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 20598 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 20599 | Muldowney Development, Inc. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 20600 | Mule Kick Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |