Shinfox Energy (TPE:6806) incurred a net loss attributable to owners of NT$1.85 billion in the first quarter, or NT$6.73 per basic share, according to a Wednesday disclosure on the Taiwan Exchange.
Shares fell about 10% in Thursday's late morning trade.
The renewable energy developer did not provide comparative year-ago figures.
Operating revenue amounted to NT$4.19 billion, it said.