1 | U R C C | | Oil & Gas Operator | Jun 1991 |
2 | U S Exploraton Liq Trust | | Oil & Gas Operator | Oct 1994 |
3 | U S Liquids Of La., L.P. | | Oil Operator | Mar 2014 |
4 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2024 |
5 | U. O. C., Inc. | | Oil Operator | Jun 2019 |
6 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 2024 |
7 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |
8 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
9 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
10 | Ultramar Production Company | | Oil & Gas Operator | Dec 1991 |
11 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
12 | Uni Production Company, Inc. | | Oil & Gas Operator | Apr 1988 |
13 | Unifid Oil & Gas Corp. | | Oil & Gas Operator | Mar 1994 |
14 | Union Diversified Investments, Inc. | | Gas Operator | Jun 2024 |
15 | Union Diversified, Inc. | | Gas Operator | Dec 2008 |
16 | Union Drilling &Management Inc | | Gas Operator | Feb 1991 |
17 | Union Exploration Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
18 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | Dec 2024 |
19 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
20 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
21 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
22 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
23 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
24 | United Investment Group | | Oil Operator | Nov 2004 |
25 | United Operators, Inc. | | Oil Operator | Sep 1999 |
26 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 |
27 | United Southern Resources Inc. | | Gas Operator | Nov 2013 |
28 | United World Energy Corporation | | Oil & Gas Operator | Jun 2024 |
29 | Universal Drilling Co., Inc. | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 |
30 | Universal Land | | Oil Operator | Apr 2024 |
31 | Universal Oil Co. | | Oil Operator | Jul 2024 |
32 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
33 | Universal Producers, Inc. | | Oil Operator | Jun 2001 |
34 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
35 | University Field Management LLC | | Oil Operator | May 2024 |
36 | Unocal Exploration Corporation | | Oil & Gas Operator | May 1992 |
37 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
38 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2024 |
39 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
40 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Oct 2024 |