Cogent Communications (CCOI) reported Q4 net loss Thursday of $0.91 per diluted share, swinging from earnings of $4.17 a year earlier.
Analysts polled by FactSet expected a loss of $1.21.
Service revenue for the quarter ended Dec. 31 was $252.3 million, from $272.1 million a year earlier.
Analysts surveyed by FactSet expected $258.2 million.
Shares were down nearly 1% in premarket activity.