Episil-Precision (TPE:3016) posted operating revenue of NT$433.8 million for May, surging 37% from NT$316 million a year earlier, according to a Monday Taiwan Exchange filing.
Shares rallied about 8% in Tuesday's late afternoon trade.
For the five-month period, accumulated revenue climbed 25% to NT$1.92 billion, compared with NT$1.53 billion in the corresponding period last year, it said.