Approach Resources Inc $4,691 Hallador Petroleum Co $3,770,584 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,637,082 Ramaco Resources Inc $1,762,914 Riley Exploration Permian Ord Shs $189,455 Approach Resources Inc $4,691 Hallador Petroleum Co $3,770,584 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,637,082 Ramaco Resources Inc $1,762,914 Riley Exploration Permian Ord Shs $189,455