CNX Resources (CNX) reported a Q1 loss Thursday of $1.34 per diluted share, swinging from a profit of $0.04 a year earlier.
Analysts polled by FactSet expected a profit of $0.64.
Revenue for the quarter ended March 31 was $82.4 million compared with $384.6 million a year earlier.
Analysts surveyed by FactSet expected $511.6 million.
Shares of the company were slightly lower in recent premarket activity.