| 5001 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 5002 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Jul 2025 |
| 5003 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Jul 2025 |
| 5004 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jul 2025 |
| 5005 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jul 2025 |
| 5006 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 5007 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 5008 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 5009 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Jul 2025 |
| 5010 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jul 2025 |
| 5011 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 5012 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 5013 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 5014 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 5015 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 5016 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | Jul 2025 |
| 5017 | Hilbers Oil & Gas | Archer City, TX 76351 | Oil & Gas Operator | Oct 2002 |
| 5018 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 5019 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 5020 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 5021 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 5022 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 5023 | Hill, Albert, Trust | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 5024 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 5025 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Jul 2025 |
| 5026 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 5027 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 5028 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 5029 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |
| 5030 | Hill-Lake Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Jul 2025 |
| 5031 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 5032 | Hilliard Oil | Bronte, TX 76933 | Oil & Gas Operator | Mar 2008 |
| 5033 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 5034 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 5035 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 5036 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 5037 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 5038 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 5039 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 5040 | Hilltex Operating Company, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2021 |
| 5041 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2025 |
| 5042 | Hillwood Energy Texas, L.P. | Fort Worth, TX 76177 | Gas Operator | Jan 2010 |
| 5043 | Hillwood O & G Operating Co LP | Fort Worth, TX 76102 | Gas Operator | Jul 2025 |
| 5044 | Hilty Interests, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Jun 1989 |
| 5045 | Hindman, E. C. Jr. Partnership | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2008 |
| 5046 | Hinds Petroleum, LLC | Houston, TX 77263 | Oil Operator | Jul 2025 |
| 5047 | Hinds Petroleum, LP | Houston, TX 77263 | Oil Operator | Feb 2017 |
| 5048 | Hines, Ralph, Jr. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2002 |
| 5049 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 5050 | Hinkle, Howard L. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 5051 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 5052 | Hinton, W. B. | MT Pleasant, TX 75455 | Oil & Gas Operator | Jul 1993 |
| 5053 | Hipp Oil And Gas Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Jul 2025 |
| 5054 | Hitex Resources, LP | Houston, TX 77265 | Oil & Gas Operator | Jul 2025 |
| 5055 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 5056 | HMH Operators, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 5057 | HMT Genesis Petroleum Corp. | Fort Worth, TX 76116 | Oil & Gas Operator | Nov 2008 |
| 5058 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Apr 2025 |
| 5059 | HNG Storage Company | Houston, TX 77042 | Oil & Gas Operator | Mar 2002 |
| 5060 | Hobbs Energy Corporation | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 5061 | Hoc Operating Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Nov 1999 |
| 5062 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 5063 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2025 |
| 5064 | Hodgden, Jack D. | Enid, OK 73702 | Oil & Gas Operator | Apr 2000 |
| 5065 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 5066 | Hodges & Hodges Productions | Anson, TX 79501 | Oil & Gas Operator | Aug 2003 |
| 5067 | Hodges & Rister | Abilene, TX 79603 | Oil & Gas Operator | Apr 2016 |
| 5068 | Hodges, James Aaron | Fort Worth, TX 76179 | Oil & Gas Operator | Jul 2025 |
| 5069 | Hodges, Thomas | Alvord, TX 76225 | Oil & Gas Operator | Oct 2002 |
| 5070 | Hoell Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 5071 | Hoelscher, Weldon | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 5072 | Hoermann, S. E. | Seguin, TX 78155 | Oil & Gas Operator | Jul 2025 |
| 5073 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 5074 | Hoffmann Oil Company | Eastland, TX 76448 | Oil & Gas Operator | Jul 2025 |
| 5075 | Hog Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 5076 | Hogan, Wayne Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jun 2006 |
| 5077 | Hoggard, Kenneth | Loving, TX 76460 | Oil & Gas Operator | Jul 2025 |
| 5078 | Holbein & Wright Resources Inc. | Bandera, TX 78003 | Oil & Gas Operator | Jul 2025 |
| 5079 | Holco Oil & Gas | Borger, TX 79008 | Oil & Gas Operator | Jul 2025 |
| 5080 | Holcomb Company, The | Freer, TX 78357 | Oil & Gas Operator | Aug 1996 |
| 5081 | Holcomb Enterprises | Clyde, TX 79510 | Oil & Gas Operator | Aug 2003 |
| 5082 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 5083 | Holden Oil & Gas | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 5084 | Holifield Oil Company | Giddings, TX 78942 | Oil & Gas Operator | Mar 2009 |
| 5085 | Holland Oil & Gas | Brookesmith, TX 76827 | Oil & Gas Operator | Dec 2010 |
| 5086 | Holland Oil Co. | Petrolia, TX 76377 | Oil Operator | Aug 2010 |
| 5087 | Holland, W. M. | Petrolia, TX 76377 | Oil & Gas Operator | Jul 2009 |
| 5088 | Hollandsworth & Travis | Longview, TX 75606 | Oil & Gas Operator | Mar 2001 |
| 5089 | Holler Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Aug 2003 |
| 5090 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | Jul 2025 |
| 5091 | Holley Operating, L. L. C. | Abilene, TX 79601 | Oil Operator | Jul 2025 |
| 5092 | Holli-Tex Supply Co. | Holliday, TX 76366 | Oil & Gas Operator | May 2018 |
| 5093 | Holliday CSG Corp. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 5094 | Holliday Drilling, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Dec 2020 |
| 5095 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 5096 | Holloway Oil Company | Austin, TX 78764 | Oil & Gas Operator | Feb 2004 |
| 5097 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |
| 5098 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Jul 2025 |
| 5099 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 5100 | Holmac Oil Company | Hobbs, NM 88240 | Oil & Gas Operator | May 1996 |