Amkor Technology (AMKR) reported Q3 earnings late Monday of $0.49 per diluted share, down from $0.54 a year earlier.

Analysts surveyed by Capital IQ expected $0.50.

Net sales for the quarter ended Sept. 30 were $1.86 billion, up from $1.82 billion a year earlier.

Analysts polled by Capital IQ expected $1.84 billion.

For Q4, the company said it expects earnings of $0.28 to $0.44 per share on net sales of $1.6 billion to $1.7 billion. Analysts polled by Capital IQ expect $0.55 and $1.84 billion, respectively.

The company's shares dropped past 10% in recent after-hours activity.

Price: 26.51, Change: -3.02, Percent Change: -10.23