Approach Resources Inc $4,691 Hallador Petroleum Co $3,493,225 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,637,082 Ramaco Resources Inc $1,732,791 Riley Exploration Permian Ord Shs $195,646 Approach Resources Inc $4,691 Hallador Petroleum Co $3,493,225 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,637,082 Ramaco Resources Inc $1,732,791 Riley Exploration Permian Ord Shs $195,646