Select Water Solutions (WTTR) reported Q4 loss late Tuesday of $0.02 per diluted share, swinging from earnings of $0.27 a year earlier.
Analysts polled by FactSet expected earnings of $0.08.
Revenue for the quarter ended Dec. 31 was $349.1 million, down from $374.9 million a year earlier.
Analysts surveyed by FactSet expected $335.6 million.
The shares dropped 5% in after-hours trading.