Approach Resources Inc $4,691 Hallador Petroleum Co $3,048,451 Carbon Natural Gas Company $0 Star Gas Partners Lp $12,613,353 Ramaco Resources Inc $2,105,743 Riley Exploration Permian Ord Shs $188,672 Approach Resources Inc $4,691 Hallador Petroleum Co $3,048,451 Carbon Natural Gas Company $0 Star Gas Partners Lp $12,613,353 Ramaco Resources Inc $2,105,743 Riley Exploration Permian Ord Shs $188,672