| Business | Phone |
| Oaks Resources Management Inc 7900 E Union Ave # 1009, Denver 80237 | (303) 217-7000 |
| Harry A Ells Jr 518 17th St # 1410, Denver 80202 | (303) 595-4888 |
| Freedman Oil & Gas Co 1580 Lincoln St # 650, Denver 80203 | (303) 837-0500 |
| Trinity Petroleum Management 1801 Broadway # 600, Denver 80202 | (303) 296-1908 |
| K P Kauffman Co 1675 Broadway # 2800, Denver 80202 | (303) 825-4822 |
| Lone Wolf Operating Co 1125 17th St # 2290, Denver 80202 | (720) 904-6949 |
| Louis S Madrid Oil & Gas 410 17th St # 1120, Denver 80202 | (303) 825-6135 |
| Paccs 1580 Lincoln St # 610, Denver 80203 | (303) 860-1619 |