ASE Technology's (TPE:3711) attributable profit surged to NT$21.1 billion in the second quarter from NT$7.52 billion a year earlier.
Diluted earnings per share rose to NT$4.61 from NT$1.70 a year earlier.
Revenue climbed 27% year over year to NT$191.1 billion due to higher semiconductor assembly, testing and electronic manufacturing services sales. On a sequential basis, revenue increased 10%.
Gross margin improved to 21% from 20% in the first quarter, while operating margin rose to 11% from 10%, it said.