ChipMOS Technologies (IMOS) reported unaudited Q4 revenue Friday of 6.52 billion New Taiwan dollars ($206.2 million), up nearly 21% from a year earlier.
Two analysts polled by FactSet expected NT$6.36 billion.
The company said its revenue in December jumped about 24% year over year to NT$2.20 billion.
ChipMOS shares were up 3.6% in recent premarket activity.