LyondellBasell Industries (LYB) reported Q1 adjusted earnings Friday of $0.33 per diluted share, down from $1.31 a year earlier.
Analysts polled by FactSet expected $0.42.
Revenue for the quarter ended March 31 was $7.68 billion, down from $8.30 billion a year earlier.
Analysts surveyed by FactSet expected $7.47 billion.
The company's shares were down 1.1% in recent premarket activity.