| 1 | Basin Petroleum, LLC | | Oil Operator | Dec 2017 |
| 2 | Big Man Oil Co, Inc | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2022 |
| 3 | Bretagne, G P | Beattyville, KY 41311 | Oil & Gas Operator | Dec 2022 |
| 4 | Buttes Gas & Oil Co | | Oil & Gas Operator | Dec 2009 |
| 5 | Cain, Nicholas A & Darry R | | Oil Operator | Dec 2002 |
| 6 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Mar 2025 |
| 7 | Core Minerals Operating Co Inc | | Oil Operator | Dec 2021 |
| 8 | Countrymark Energy Resources, LLC | MT Vernon, IN 47620 | Oil & Gas Operator | Dec 2022 |
| 9 | Duncan, Gene L Dba Duncan Oil Co | Salem, IL 62881 | Oil Operator | Dec 2018 |
| 10 | Ewm Services, LLC | Morganfield, KY 42437 | Oil Operator | Dec 2022 |
| 11 | Farrar Oil Co | MT Vernon, IL 62864 | Oil & Gas Operator | Dec 2000 |
| 12 | Geigo Co, LLP | | Oil Operator | Dec 2017 |
| 13 | Geo Oil Co Inc | Bloomington, IN 47402 | Oil Operator | Dec 2021 |
| 14 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2012 |
| 15 | Gulf Refining Co. | | Oil Operator | Dec 2006 |
| 16 | Har-Ken Agent Ok, LTD | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2022 |
| 17 | Jaguar Oil, LLC | Evansville, IN 47713 | Oil Operator | Dec 2022 |
| 18 | Kelly Energy Co, Inc | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 19 | KLC Petroleum Company, LLC | Henderson, KY 42420 | Oil Operator | Dec 2021 |
| 20 | L. A. W. Oil, LLC | | Oil Operator | Dec 2018 |
| 21 | Lincoln Energy Corporation | Dennis, MA 02638 | Oil & Gas Operator | Dec 2021 |
| 22 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 23 | MC Oil, LLC | Morganfield, KY 42437 | Oil Operator | Dec 2022 |
| 24 | Meridian Resources, LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 25 | Nally, Joseph L | Uniontown, KY 42461 | Oil & Gas Operator | Dec 2021 |
| 26 | Ohio Kentucky Oil Corporation | Lexington, KY 40503 | Oil & Gas Operator | Dec 2020 |
| 27 | Overfield, Lee R | Waverly, KY 42462 | Oil Operator | Dec 2016 |
| 28 | Payne, George A | Newburgh, IN 47629 | Oil Operator | Dec 2022 |
| 29 | Payne, H Jennings Dba Payne Bros | Newburgh, IN 47630 | Oil Operator | Dec 2022 |
| 30 | Picayune Resources, Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2022 |
| 31 | Pioneer Oil Company, Inc | Vincennes, IN 47501 | Oil & Gas Operator | Nov 2024 |
| 32 | Robinson Engineering & Oil Company, Inc | Evansville, IN 47716 | Oil & Gas Operator | Dec 2022 |
| 33 | Roseclare Oil Co | | Oil Operator | Dec 2016 |
| 34 | Stouder DRLG Co | | Oil & Gas Operator | Dec 2022 |
| 35 | Sun Oil Company | Arlington, TX 76006 | Oil & Gas Operator | Dec 2021 |
| 36 | Union Operating Corp | Lakewoord, CO 80215 | Oil Operator | Dec 2022 |
| 37 | Union Petro Inc | Uniontown, KY 42461 | Oil Operator | Dec 2022 |
| 38 | V-T DRLG Co | | Oil Operator | Dec 2022 |
| 39 | W W Pet Service, Inc | Dixon, KY 42409 | Oil & Gas Operator | Dec 2022 |