Approach Resources Inc $4,691 Hallador Petroleum Co $3,658,141 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,889,854 Ramaco Resources Inc $1,741,398 Riley Exploration Permian Ord Shs $196,999 Approach Resources Inc $4,691 Hallador Petroleum Co $3,658,141 Carbon Natural Gas Company $0 Star Gas Partners Lp $13,889,854 Ramaco Resources Inc $1,741,398 Riley Exploration Permian Ord Shs $196,999