Calumet (CLMT) reported a Q1 loss Friday of $1.87 per diluted share, wider than a loss of $0.51 a year earlier.
Analysts polled by FactSet expected a loss $0.51.
Revenue for the quarter ended March 31 was $993.9 million compared with $1.01 billion a year earlier.
Analysts surveyed by FactSet expected $891.4 million.
Shares of the company fell 5.1% in recent premarket activity.