1 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
2 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
3 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
4 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
5 | Halcon Holdings, Inc. | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
6 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
7 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Sep 2024 |
8 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Sep 2024 |
9 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
10 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
11 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Sep 2024 |
12 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
13 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Sep 2024 |
14 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
15 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
16 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
17 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2024 |
18 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2024 |
19 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
20 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Oct 2024 |
21 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Oct 2024 |
22 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
23 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2024 |
24 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
25 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
26 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
27 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
28 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
29 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
30 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
31 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
32 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2024 |
33 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
34 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |