United Microelectronics (UMC) reported Q2 earnings Wednesday of 3.55 New Taiwan dollars ($0.12) per American depositary share, down from NT$5.55 a year earlier.
Analysts polled by FactSet expected NT$4.13.
Operating revenue for the quarter ended June 30 was NT$58.76 billion, up from NT$56.80 billion a year earlier.
Analysts surveyed by FactSet expected NT$57.26 billion.