| 4001 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 4002 | Four Corners Energy, LLC | Gulf Breeze, FL 32563 | Oil & Gas Operator | Oct 2025 |
| 4003 | Four Corners Petroleum II, LLC | Denver, CO 80215 | Oil & Gas Operator | Feb 2023 |
| 4004 | Four Diamond Operating, LLC | Kilgore, TX 75662 | Oil Operator | Oct 2025 |
| 4005 | Four Forty One Oil Co. | Natalia, TX 78059 | Oil & Gas Operator | Oct 2025 |
| 4006 | Four H Oil Properties | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 4007 | Four K Production | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 4008 | Four Kin Oil Co | Muenster, TX 76252 | Oil & Gas Operator | Dec 2001 |
| 4009 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 4010 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 4011 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 4012 | Four Square Production, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Aug 2004 |
| 4013 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Jul 2025 |
| 4014 | Four Starr Energy, Inc. | Dallas, TX 75243 | Gas Operator | May 2016 |
| 4015 | Four Starr Production, LLC | Dallas, TX 75243 | Oil & Gas Operator | Oct 2025 |
| 4016 | Four-C Management & Industries | Rockdale, TX 76567 | Oil & Gas Operator | Aug 2008 |
| 4017 | Four-S Oil Co., LTD. | Kilgore, TX 75663 | Oil Operator | Apr 2007 |
| 4018 | Fourcooks Oil & Gas, LLC | Waco, TX 76710 | Oil Operator | Oct 2025 |
| 4019 | Fourpoint Energy, LLC | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 4020 | Fourstar Resources LLC | Westlake, TX 76262 | Oil Operator | Aug 2025 |
| 4021 | Fourth Floor Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 4022 | Fourway Oil Company | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 4023 | Fowler Oil & Gas LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 4024 | Fox Oil And Gas Inc | Houston, TX 77002 | Gas Operator | Dec 2002 |
| 4025 | Fox Oil, Inc. | Iowa Park, TX 76367 | Oil & Gas Operator | Feb 1999 |
| 4026 | Fox Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Aug 2025 |
| 4027 | Fox, Hewitt B., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Oct 2025 |
| 4028 | Foxborough Energy Company, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 4029 | Foxfire Productions, Inc. | Corsicana, TX 75110 | Oil Operator | Jul 2014 |
| 4030 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 4031 | Fraco Services, Inc. | Burkburnett, TX 76354 | Oil Operator | Oct 2025 |
| 4032 | Frances Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2025 |
| 4033 | Francisco Creek Operating, Inc. | Castroville, TX 78009 | Oil Operator | Oct 2025 |
| 4034 | Frank Louis L | Kingsville, TX 78364 | Oil & Gas Operator | Aug 2003 |
| 4035 | Franklin, J.W. Oil Operator | | Oil & Gas Operator | Nov 2001 |
| 4036 | Franklin, Jack | Arlington, TX 76013 | Oil & Gas Operator | Nov 2007 |
| 4037 | Fratelli Exploration, L.P. | Bedford, TX 76095 | Oil Operator | Oct 2025 |
| 4038 | Frazier Exploration Partners,LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 4039 | Frazier Resources Company | Houston, TX 77057 | Gas Operator | May 2004 |
| 4040 | Frazier, VIolet H. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2014 |
| 4041 | Fred Underwood, LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 4042 | Fredco | Louise, TX 77455 | Oil & Gas Operator | Oct 2025 |
| 4043 | Freddy'S Well Service, Inc. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 4044 | Fredna Oil Co. | Aledo, TX 76008 | Oil & Gas Operator | Sep 2020 |
| 4045 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 4046 | Free Rein Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 4047 | Freedom Energy Inc | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2025 |
| 4048 | Freedom Energy, Inc. (I) | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2003 |
| 4049 | Freedom Energy, LTD. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2011 |
| 4050 | Freeman Energy Inc. (I) | Fredericksbrg, TX 78624 | Oil & Gas Operator | Aug 1996 |
| 4051 | Freeman Expl. & Prod. Co., Inc. | Houston, TX 77279 | Oil & Gas Operator | Aug 2020 |
| 4052 | Freeman Oil Co | Midland, TX 79701 | Oil & Gas Operator | Sep 2014 |
| 4053 | Freeman, James C. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 2000 |
| 4054 | Freeman, Kathleen Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 1996 |
| 4055 | Freeman, Michael | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 4056 | Freeport Oil Company | New Orleans, LA 70112 | Oil & Gas Operator | Oct 1979 |
| 4057 | Freeport-McMoran Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 4058 | Freestone Resources, Inc | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 4059 | Fremont Energy, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Dec 1999 |
| 4060 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 4061 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |
| 4062 | Fresno Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Oct 2025 |
| 4063 | Friemel & Carpenter, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2002 |
| 4064 | Friemel, Paul D. & Assoc., Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2007 |
| 4065 | Friendly Energy Services, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Oct 2025 |
| 4066 | Frio Engineering Inc. | Houston, TX 77066 | Oil & Gas Operator | Oct 2025 |
| 4067 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 4068 | Frio Oil & Gas, LTD. | Austin, TX 78731 | Oil Operator | Oct 2025 |
| 4069 | Frio Production Co. | Alice, TX 78333 | Oil & Gas Operator | Sep 1998 |
| 4070 | Frio Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 4071 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 4072 | Frisco Oil Corporation | Tyler, TX 75701 | Oil & Gas Operator | Mar 2000 |
| 4073 | Frisco Petroleum Management, LLC | Frisco, TX 75034 | Oil & Gas Operator | Sep 2021 |
| 4074 | Front Street Operating, LLC | Sourlake, TX 77659 | Oil & Gas Operator | Oct 2025 |
| 4075 | Frontier Gas Operating Corp. | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 4076 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 4077 | Frontier Resources, Inc. | Dallas, TX 75214 | Oil & Gas Operator | Oct 2025 |
| 4078 | Frost Brothers Resources, LLLP | Fort Worth, TX 76101 | Gas Operator | Nov 2024 |
| 4079 | Frost, C.M., P.M. & V.W. | Simonton, TX 77476 | Oil & Gas Operator | Feb 2000 |
| 4080 | Frost, Kenneth Oil & Gas Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1995 |
| 4081 | Frost,Cyrus B.,Jr.& Fleming, WM. | Eastland, TX 76448 | Oil & Gas Operator | May 2004 |
| 4082 | Frostwood Energy, LLC | Houston, TX 77219 | Oil & Gas Operator | Oct 2025 |
| 4083 | FTC Consulting, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 4084 | FTM Incorporated | Weatherford, TX 76086 | Gas Operator | Oct 2025 |
| 4085 | Fuego Energy, LLC | Fort Worth, TX 76136 | Oil Operator | Oct 2025 |
| 4086 | Fuel Products, Inc. | Midland, TX 79702 | Oil Operator | Mar 2002 |
| 4087 | Fueled Resources Inc | Boyd, TX 76023 | Oil & Gas Operator | Oct 2025 |
| 4088 | Fuji Resources Production Co,Inc | Houston, TX 77036 | Oil & Gas Operator | Feb 2000 |
| 4089 | Ful-Hill Oil & Gas, Inc. | Marshall, TX 75670 | Oil & Gas Operator | Aug 2003 |
| 4090 | Ful-Hill Oil & Gas, L.L.P. | Overton, TX 75684 | Oil & Gas Operator | Jun 2016 |
| 4091 | Fulcrum Energy Operating, LLC | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 4092 | Fulcrum Exploration, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Jun 2025 |
| 4093 | Fulfer Oil And Cattle Co. | Jal, NM 88252 | Oil & Gas Operator | Oct 2025 |
| 4094 | Fulfer, O. L. Operating Co., Inc | Iowa Park, TX 76367 | Oil & Gas Operator | Nov 1999 |
| 4095 | Fuller Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1995 |
| 4096 | Fuller Operating Company | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2008 |
| 4097 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 4098 | Fuller Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 4099 | Fullerton Energy Corporation | Dallas, TX 75230 | Oil & Gas Operator | Apr 2002 |
| 4100 | Fullerton, B. N. | San Angelo, TX 76904 | Oil & Gas Operator | Jul 1994 |