Cyber Power Systems' (TPE:3617) profit slumped 27% annually in June to NT$96 million, or NT$1.02 per share.
Monthly revenue slipped 1% to NT$981 million, according to a Thursday Taiwan Exchange filing.
Meanwhile, first-quarter profit dropped 17% from a year ago to NT$414 million, or NT$4.40 per share.
Revenue for the quarter rose nearly 12% to NT$2.87 billion, it said.